{ "data": { "a": { "slug": "assemblyai-voice-agent", "name": "AssemblyAI Voice Agent API", "vendor": "AssemblyAI, Inc.", "vendorUrl": "https://www.assemblyai.com", "kind": "http-api", "category": "voice-agents", "summary": "AssemblyAI's Voice Agent API runs a spoken conversation over one WebSocket, combining its own speech-to-text, language model and text-to-speech. Agents are stored through a REST API and reached from a browser, a server or an inbound Twilio SIP number.", "url": "https://www.anchorterminal.com/tools/assemblyai-voice-agent", "markdownUrl": "https://www.anchorterminal.com/tools/assemblyai-voice-agent.md", "slimMarkdownUrl": "https://www.anchorterminal.com/tools/assemblyai-voice-agent.min.md", "jsonUrl": "https://www.anchorterminal.com/api/v1/tools/assemblyai-voice-agent.json", "dns": "assemblyai-voice-agent.grade.anchorterminal.com", "repo": "https://github.com/AssemblyAI/voice-agent-starter-python", "license": "Proprietary service under AssemblyAI's Terms of Service. The two starter repositories on GitHub carry no licence file", "transports": [ "http" ], "remoteUrl": "wss://agents.assemblyai.com/v1/ws", "packages": [], "auth": "api-key", "authNotes": "Self-serve API key from the dashboard, sent in the `Authorization` header on REST calls and on the WebSocket upgrade, with or without a `Bearer` prefix. Keys belong to a project and can be created and deleted in the dashboard (2 on the free plan, 4 on pay as you go, 25 on a contract). No scopes or expiry were found. Browser clients use a one-time token from `GET /v1/token`, redeemable within 1 to 600 seconds and passed as the `token` query parameter.", "pricing": "usage", "pricingNotes": "No Voice Agent API price was found on AssemblyAI's pricing page or in its billing docs on 2 November 2026. On 9 October both gave $4.50 an hour ($0.075 a minute), billed per second from socket open to session end, covering speech-to-text, the managed model, speech output and recordings. The $50 new-account credit is now listed for speech-to-text, Speech Understanding and Guardrails only. LLM Gateway tokens and Twilio carrier minutes are billed separately (https://www.assemblyai.com/pricing, https://www.assemblyai.com/docs/billing-and-pricing, checked 2026-11-02).", "priceSummary": "Pay per use", "where": "hosted", "x402": { "level": "no", "evidence": "No x402, MPP or L402 in the Voice Agent docs, the two API description files, the billing docs or the pricing page. Payment is by card into a prepaid balance (checked 2026-10-09).", "endpoints": [] }, "toolCount": null, "popularity": { "githubStars": null, "npmWeekly": null, "pypiWeekly": null, "asOf": "2026-10-09" }, "docsUrl": "https://www.assemblyai.com/docs/voice-agents/voice-agent-api", "llmsTxt": "https://www.assemblyai.com/docs/llms.txt", "openapi": "https://www.assemblyai.com/docs/api-reference/specs/voice-agent-api.yaml", "capabilities": [ "voice.agent", "voice.pipeline", "voice.tools", "voice.telephony" ], "tags": [ "hosted", "closed-source", "llms-txt", "webhooks", "streaming", "pipeline", "python", "javascript", "status-page", "soc2" ], "lastRelease": "2026-09-16", "graded": true, "anchor": { "graded": true, "score": 56.4, "grade": "C", "agentReady": false, "rank": 822, "ranked": true, "rankOf": 1486, "categoryRank": 15, "methodology": "0.7", "run": "2026-10-01", "scores": { "ergonomics": 72, "maintenance": 64, "payments": 0, "reliability": 65, "schema": 83, "security": 55, "transparency": 68 }, "pending": [ "performance", "tasks" ], "assessment": { "confidence": "low", "date": "2026-11-02" }, "negative": -3, "negativeNotes": [ "2026-09-01: AssemblyAI's changelog entry \"Fix: Reader Role Permissions Enforced for API Tokens\" says dashboard users with the Reader role could create, edit and delete API tokens, the keys that also open Voice Agent sessions. A released fix of a described flaw with no advisory takes -3, read as assemblyai-stt on the same entry (https://www.assemblyai.com/changelog)" ], "verdict": "The socket has an AsyncAPI file, typed error codes with retry advice and a 30-second resume window, and the status feed shows only partial realtime incidents since August. On 2 November AssemblyAI's pricing page and billing docs no longer listed the API or its rate, no concurrent-session limit is published, and telephony is inbound only.", "bestFor": "A developer who wants one managed pipeline at a flat rate and is content with AssemblyAI's own speech models and voices, with an optional model of their own.", "strengths": [ "AsyncAPI 3.0 file for the socket, an OpenAPI file for the token endpoint, and a Markdown copy of every Voice Agent docs page", "Session errors carry a code, a message and sometimes the offending field, and the docs name the three codes that are safe to retry", "HTTP tool header values are write-only and encrypted at rest, and tool calls are limited to public `https` hosts with redirects refused", "Every session is stored with a stereo recording, a JSON timeline of turns and tool calls, and signed webhooks with a delivery history", "Pre-connect requests (16 September 2026) can look up an inbound caller before the call is answered" ], "weaknesses": [ "No Voice Agent API price on the pricing page or in the billing docs on 2 November 2026, and the free credit no longer names it", "No number is published for the concurrent-session limit that the `concurrency_exceeded` error enforces", "status.assemblyai.com lists the Asynchronous API, Streaming API and LLM Gateway, with no Voice Agent component", "Telephony is inbound only, over a SIP trunk on a Twilio account the customer owns", "API keys have no scopes or expiry, and opting out of model training needs a paid plan" ], "agentNotes": [ "Send `session.end` before closing the socket. Without it the session stays resumable, and billed, for 30 seconds", "Retry only `at_capacity`, `concurrency_exceeded` and `internal_error`, with backoff. Every other session error code is fatal", "Send `tool.result` inside the `reply.done` handler, not straight after `tool.call`", "Mint a one-time token with `GET /v1/token` for browser clients and never ship the API key to a page", "Deduplicate webhooks on `event_id`, and verify `X-AAI-Signature` against the raw body bytes because a 401 is not retried" ], "metrics": { "kind": "remote", "measured": false }, "reviewCount": 4, "avgRating": 3.5, "history": [ { "basis": "public evidence", "confidence": "low", "grade": "C", "methodology": "0.7", "pending": [ "performance", "tasks" ], "run": "2026-10-01", "runLabel": "October 2026 research run", "score": 56.4 } ], "editorialScores": { "ergonomics": 72, "maintenance": 64, "payments": 0, "reliability": 65, "schema": 83, "security": 55, "transparency": 51 }, "provenanceScore": 84, "checked": { "categories": { "ergonomics": "2026-11-02", "maintenance": "2026-11-02", "payments": "2026-11-02", "reliability": "2026-11-02", "schema": "2026-11-02", "security": "2026-11-02", "transparency": "2026-11-02" }, "last": "2026-11-02", "lastMoved": "2026-11-02", "oldest": "2026-11-02", "stale": false, "staleAfterDays": 90 } }, "connect": { "install": "git clone https://github.com/AssemblyAI/voice-agent-starter-python", "http": "curl -X POST https://agents.assemblyai.com/v1/agents \\\n -H \"Authorization: $ASSEMBLYAI_API_KEY\" \\\n -H \"Content-Type: application/json\" \\\n -d '{\"name\": \"Support Assistant\", \"system_prompt\": \"You are a friendly support agent.\", \"greeting\": \"Hi, how can I help?\", \"voice\": {\"voice_id\": \"alba\"}}'", "claudeCode": "claude mcp add --transport http --scope user assemblyai-docs https://mcp.assemblyai.com/docs" }, "letme": { "capability": "https://letme.dev/voice.agent", "tool": "https://letme.dev/assemblyai-voice-agent" }, "sameCompany": [ "assemblyai-stt" ], "area": "voice", "provenance": { "legalEntity": "AssemblyAI, Inc.", "domain": "assemblyai.com", "domainRegistered": "2016-12-24", "endpointOnVendorDomain": true, "terms": "https://www.assemblyai.com/legal/terms-of-service", "privacy": "https://www.assemblyai.com/legal/privacy-policy", "statusPage": "https://status.assemblyai.com", "changelog": "https://www.assemblyai.com/changelog", "securityTxt": "unknown", "checked": "2026-11-02", "notes": [ "www.assemblyai.com's robots.txt disallows /.well-known, so security.txt wasn't read and securityTxt stays unknown.", "The subprocessor list at /legal/subprocessors redirects to app.vanta.com, whose robots.txt disallows every path.", "status.assemblyai.com disallows /api/ and /embed/; history.atom was read." ], "score": 84 }, "pageJsonUrl": "https://www.anchorterminal.com/tools/assemblyai-voice-agent.json", "live": { "slug": "assemblyai-voice-agent", "probe": { "target": "wss://agents.assemblyai.com/v1/ws", "method": "get", "lastAt": "2026-11-07T18:20:11.287781618Z", "lastOk": false, "lastStatus": 0, "lastMs": 0, "lastNote": "unsupported protocol scheme \"wss\"", "authRequired": false, "uptime24h": 0, "uptime30d": 0, "p50ms24h": 0, "p95ms24h": 0, "samples24h": 239, "samples30d": 7205, "days": [ { "date": "2026-10-09", "probes": 85, "ok": 0 }, { "date": "2026-10-10", "probes": 247, "ok": 0 }, { "date": "2026-10-11", "probes": 247, "ok": 0 }, { "date": "2026-10-12", "probes": 247, "ok": 0 }, { "date": "2026-10-13", "probes": 248, "ok": 0 }, { "date": "2026-10-14", "probes": 249, "ok": 0 }, { "date": "2026-10-15", "probes": 253, "ok": 0 }, { "date": "2026-10-16", "probes": 252, "ok": 0 }, { "date": "2026-10-17", "probes": 253, "ok": 0 }, { "date": "2026-10-18", "probes": 256, "ok": 0 }, { "date": "2026-10-19", "probes": 255, "ok": 0 }, { "date": "2026-10-20", "probes": 252, "ok": 0 }, { "date": "2026-10-21", "probes": 253, "ok": 0 }, { "date": "2026-10-22", "probes": 253, "ok": 0 }, { "date": "2026-10-23", "probes": 248, "ok": 0 }, { "date": "2026-10-24", "probes": 251, "ok": 0 }, { "date": "2026-10-25", "probes": 250, "ok": 0 }, { "date": "2026-10-26", "probes": 252, "ok": 0 }, { "date": "2026-10-27", "probes": 249, "ok": 0 }, { "date": "2026-10-28", "probes": 251, "ok": 0 }, { "date": "2026-10-29", "probes": 249, "ok": 0 }, { "date": "2026-10-30", "probes": 248, "ok": 0 }, { "date": "2026-10-31", "probes": 251, "ok": 0 }, { "date": "2026-11-01", "probes": 249, "ok": 0 }, { "date": "2026-11-02", "probes": 250, "ok": 0 }, { "date": "2026-11-03", "probes": 248, "ok": 0 }, { "date": "2026-11-04", "probes": 246, "ok": 0 }, { "date": "2026-11-05", "probes": 185, "ok": 0 }, { "date": "2026-11-06", "probes": 241, "ok": 0 }, { "date": "2026-11-07", "probes": 187, "ok": 0 } ], "outages": [ { "start": "2026-10-09T15:42:56.660671906Z", "end": "0001-01-01T00:00:00Z", "note": "unsupported protocol scheme \"wss\"" } ] }, "vendorStatus": { "page": "https://status.assemblyai.com", "indicator": "none", "summary": "All Systems Operational", "checkedAt": "2026-11-07T18:20:33.101817943Z" }, "githubStars": 3, "securityTxt": { "url": "https://assemblyai.com/.well-known/security.txt", "state": "none", "checkedAt": "2026-11-07T16:01:59.173300071Z" }, "llmsTxt": { "url": "https://www.assemblyai.com/docs/llms.txt", "ok": true, "status": 200, "checkedAt": "2026-11-07T15:31:38.515960891Z" }, "domain": { "domain": "assemblyai.com", "registered": "2016-12-24", "source": "https://rdap.verisign.com/com/v1/domain/assemblyai.com", "checkedAt": "2026-11-01T14:13:09.893972788Z" }, "pages": [ { "url": "https://www.assemblyai.com/docs/billing-and-pricing", "kind": "pricing", "status": 200, "checkedAt": "2026-11-07T14:25:01.876438774Z", "changedAt": "2026-11-06T13:46:09.365947359Z", "fingerprint": "ec67f4032d24" } ], "github": { "repo": "assemblyai/voice-agent-starter-python", "checkedAt": "2026-11-02T08:31:58.26657978Z", "stars": 3, "archived": false, "issuesEnabled": true, "pushedAt": "2026-08-16T07:35:00Z", "openIssues": 0, "openPRs": 0, "issuesOpened90d": 0, "issuesClosed90d": 0, "prsMerged90d": 0 }, "updatedAt": "2026-11-07T18:20:11.287781618Z" } }, "answer": "AssemblyAI Voice Agent API scores 56.4 (C) on agent readiness against fone.me's 28.3 (F), and leads in 6 of 7 scored categories. fone.me leads on payments \u0026 pricing.", "b": { "slug": "fone-me", "name": "fone.me", "vendor": "Fone", "vendorUrl": "https://www.fone.me", "kind": "platform", "category": "voice-agents", "summary": "fone.me is a hosted AI agent at a personal link that answers calls and messages for a person or small business over web chat, voice, WhatsApp, Telegram and a Premium number. Other agents reach it through keyless MCP and A2A.", "url": "https://www.anchorterminal.com/tools/fone-me", "markdownUrl": "https://www.anchorterminal.com/tools/fone-me.md", "slimMarkdownUrl": "https://www.anchorterminal.com/tools/fone-me.min.md", "jsonUrl": "https://www.anchorterminal.com/api/v1/tools/fone-me.json", "dns": "fone-me.grade.anchorterminal.com", "license": "Proprietary hosted service. Terms of service at https://www.fone.me/terms, whose text draws by script and could not be read on 5 November 2026; no company is named on any page read. No source, SDK or package is published", "transports": [ "streamable-http" ], "remoteUrl": "https://www.fone.me/mcp", "packages": [], "auth": "none", "authNotes": "No credential for callers. llms.txt gives the MCP server at https://www.fone.me/mcp as Streamable HTTP with auth 'none', and the README of the GitHub repository spearisa/fone-me-mcp says 'public, like the links themselves'. The A2A agent cards read (demo and maxr) declare no securitySchemes or security. The search API at /api/agents/search takes a query with no key per llms.txt. Owners sign in with Apple, Google or email to set up an agent; no owner API key, scopes or tokens are documented.", "pricing": "freemium", "pricingNotes": "The agent, the first link and the website chat button are free. Premium is $9.99 a month (llms.txt and https://www.fone.me/alternatives/smith-ai) and adds the agent's own phone number, calling minutes and more links, with cancellation at any time; no page read gives the minute allowance, the number of links, the countries for numbers or the payment method. Outbound calls use Premium minutes and international calls use more minutes per minute. Callers and outside agents pay nothing (checked 2026-11-05).", "priceSummary": "$9.99 / mo", "where": "hosted", "x402": { "level": "no", "evidence": "No x402, MPP or L402 in llms.txt, the guide pages read, the MCP repository README and server.json, or the two agent cards (checked 2026-11-05). The MCP server and A2A endpoints are free and keyless; Premium is a monthly subscription with no payment route stated.", "endpoints": [] }, "toolCount": 4, "popularity": { "githubStars": null, "npmWeekly": null, "pypiWeekly": null, "asOf": "2026-11-05" }, "docsUrl": "https://www.fone.me/llms.txt", "llmsTxt": "https://www.fone.me/llms.txt", "capabilities": [ "voice.agent", "voice.telephony", "voice.calls", "messaging.whatsapp", "messaging.inbound" ], "tags": [ "hosted", "official", "closed-source", "mcp", "remote-mcp", "no-auth", "keyless", "a2a", "llms-txt", "whatsapp", "telegram", "ios", "freemium", "free-tier", "no-status-page" ], "lastRelease": "2026-10-05", "graded": true, "anchor": { "graded": true, "score": 28.3, "grade": "F", "agentReady": false, "rank": 1406, "ranked": true, "rankOf": 1486, "categoryRank": 26, "methodology": "0.7", "run": "2026-10-01", "scores": { "ergonomics": 29, "maintenance": 23, "payments": 50, "reliability": 15, "schema": 31, "security": 30, "transparency": 23 }, "pending": [ "performance", "tasks" ], "assessment": { "confidence": "low", "date": "2026-11-05" }, "negative": 0, "verdict": "Any agent can find a fone.me link and message its owner's agent through a keyless MCP server or A2A, with no sign-up or cost, and owners see every conversation in one inbox. Tool schemas, rate limits and abuse controls for that open channel are unpublished, the terms and privacy policy draw by script, and no company is named.", "bestFor": "Agents acting for a person who need to reach a freelancer's, shop's or small business's own AI agent at its fone.me link to ask a question, request a booking or quote or leave a message, and owners who want an answering agent on a link, WhatsApp, Telegram and a $9.99 number without building one.", "strengths": [ "Keyless MCP server and per-link A2A endpoints let any agent find, look up and message a person's or business's agent without an account or payment", "Agent cards follow A2A 0.3.0 with skills, input and output modes and a JSON-RPC transport, readable at an address robots.txt allows", "Outbound calls disclose the agent and transcription, run only 8 am to 9 pm in the callee's time zone and stop permanently on a do-not-call request", "Owners see every call and chat with a transcript in one inbox, can take over at any time and approve what the agent will say before it calls", "Free agent, first link and website chat button, with Premium at $9.99 a month for a number and calling minutes" ], "weaknesses": [ "No tool arguments, input schemas, annotations, error shapes or rate limits are published for the MCP server or A2A endpoints", "message_agent and A2A reach any person's agent with no caller identity, and no spam, rate or abuse control for that channel is documented", "The terms, privacy policy, data-deletion page, FAQ and support page draw by script, and no company, address or country of incorporation is named on any page read", "No status page, changelog, security.txt, SLA or published minute allowance for Premium", "robots.txt disallows the /mcp, /api/ and /*/a2a paths that llms.txt advertises to agents" ], "agentNotes": [ "Connect to https://www.fone.me/mcp with no credentials; use find_agents or get_agent before message_agent so the message goes to the right person's link.", "Say who you are acting for in every message_agent call; the owner reads it in an inbox as a named conversation, and conversations continue across calls.", "Treat replies as the owner's agent speaking from what it was taught, not a commitment; the vendor says it asks its owner before agreeing to anything or spending money.", "Read a link's agent card at /{link}/.well-known/agent-card.json for its skills before using A2A message/send at /{link}/a2a.", "Don't send personal or payment details through message_agent; no retention or privacy terms for agent-to-agent messages could be read." ], "metrics": { "kind": "remote", "measured": false }, "reviewCount": 0, "avgRating": 0, "history": [ { "basis": "public evidence", "confidence": "low", "grade": "F", "methodology": "0.7", "pending": [ "performance", "tasks" ], "run": "2026-10-01", "runLabel": "October 2026 research run", "score": 28.3 } ], "editorialScores": { "ergonomics": 29, "maintenance": 23, "payments": 50, "reliability": 15, "schema": 31, "security": 30, "transparency": 13 }, "provenanceScore": 32, "checked": { "categories": { "ergonomics": "2026-11-05", "maintenance": "2026-11-05", "payments": "2026-11-05", "reliability": "2026-11-05", "schema": "2026-11-05", "security": "2026-11-05", "transparency": "2026-11-05" }, "last": "2026-11-05", "oldest": "2026-11-05", "stale": false, "staleAfterDays": 90 } }, "connect": { "config": { "mcpServers": { "fone.me": { "type": "http", "url": "https://www.fone.me/mcp" } } } }, "letme": { "capability": "https://letme.dev/voice.agent", "tool": "https://letme.dev/fone-me" }, "area": "voice", "unitPrices": [ { "item": "Premium", "unit": "month", "usd": 9.99, "note": "own fone.me number, calling minutes (allowance not published) and more links; the agent, first link and chat button are free" } ], "provenance": { "legalEntity": "", "domain": "fone.me", "domainRegistered": "", "endpointOnVendorDomain": true, "terms": "https://www.fone.me/terms", "privacy": "https://www.fone.me/privacy", "statusPage": "", "changelog": "", "securityTxt": "none", "checked": "2026-11-05", "notes": [ "No legal entity is named on any page read. Page metadata gives the author and site name as 'Fone', and llms.txt gives San Francisco, CA, USA as a location. The terms, privacy policy and data-deletion page draw their text by script and showed only titles, so whether they name a company is unchecked, not absent.", "The README of github.com/spearisa/fone-me-mcp ends 'Operated by zwilio'. No fone.me page read names zwilio or links the repository, and three web searches found no company of that name, so it is not recorded as the legal entity.", "The MCP server, the search API and the A2A endpoints are on www.fone.me, the vendor's own domain. robots.txt disallows /mcp, /api/ and /*/a2a, so none was fetched; the agent cards it allows were read for two links.", "No status page or changelog found. /.well-known/security.txt answers with the app's HTML shell, recorded as none. /status failed to load.", "RDAP for fone.me, the Wayback Machine, the official MCP registry and the App Store listing (id 6759304762) were not read; each fetch needed an approval that did not come. firstReleased 2025-11-05 is the earliest sitemap lastmod (/sha_krux), a lower bound only, and falls one year to the day before the check, so the sitemap may cap its dates." ], "score": 32 }, "pageJsonUrl": "https://www.anchorterminal.com/tools/fone-me.json", "live": { "slug": "fone-me", "probe": { "target": "https://www.fone.me/mcp", "method": "get", "lastAt": "2026-11-07T18:20:25.611446017Z", "lastOk": true, "lastStatus": 405, "lastMs": 233, "authRequired": false, "uptime24h": 100, "uptime30d": 100, "p50ms24h": 215, "p95ms24h": 511, "samples24h": 200, "samples30d": 200, "days": [ { "date": "2026-11-06", "probes": 13, "ok": 13 }, { "date": "2026-11-07", "probes": 187, "ok": 187 } ] }, "securityTxt": { "url": "https://fone.me/.well-known/security.txt", "state": "none", "checkedAt": "2026-11-07T15:59:59.997697627Z" }, "llmsTxt": { "url": "https://www.fone.me/llms.txt", "ok": true, "status": 200, "checkedAt": "2026-11-07T15:32:32.136376991Z" }, "pages": [ { "url": "https://www.fone.me/privacy", "kind": "privacy", "status": 200, "checkedAt": "2026-11-07T14:28:42.001987885Z", "changedAt": "0001-01-01T00:00:00Z", "fingerprint": "e3b0c44298fc" }, { "url": "https://www.fone.me/terms", "kind": "terms", "status": 200, "checkedAt": "2026-11-07T14:28:44.174787172Z", "changedAt": "0001-01-01T00:00:00Z", "fingerprint": "e3b0c44298fc" } ], "mcpTools": { "url": "https://www.fone.me/mcp", "checkedAt": "2026-11-07T01:44:39.315960369Z", "status": "ok", "note": "answered without the initialize handshake", "tools": [ { "name": "find_agents", "title": "Find people and businesses on fone.me", "description": "Search fone.me for people's and businesses' AI agents by what they do or offer (e.g. 'dog walker', 'real estate agent in Miami', 'Spanish tutor'). Returns their fone.me links.", "inputSchema": { "properties": { "limit": { "description": "How many results (1-10). Default 5.", "type": "number" }, "query": { "description": "What you're looking for, in plain words.", "type": "string" } }, "required": [ "query" ], "type": "object" }, "annotations": { "openWorldHint": true, "readOnlyHint": true, "title": "Find people and businesses on fone.me" } }, { "name": "get_agent", "title": "Look up a fone.me agent", "description": "Get who is behind a fone.me link (e.g. fone.me/samspearin) and what their agent can help with, before messaging it.", "inputSchema": { "properties": { "link": { "description": "A fone.me link or name, e.g. 'fone.me/sam' or 'sam'.", "type": "string" } }, "required": [ "link" ], "type": "object" }, "annotations": { "openWorldHint": true, "readOnlyHint": true, "title": "Look up a fone.me agent" } }, { "name": "message_agent", "title": "Message a fone.me agent", "description": "Send a message to the AI agent at a fone.me link and get its reply — ask a question, request a booking or a quote, or leave a message for the person. The conversation continues across calls. Say who you're asking for in on_behalf_of.", "inputSchema": { "properties": { "link": { "description": "A fone.me link or name, e.g. 'fone.me/samspearin'.", "type": "string" }, "message": { "description": "What to say to the agent.", "type": "string" }, "on_behalf_of": { "description": "The name of the person you're asking for (shown to the owner).", "type": "string" } }, "required": [ "link", "message" ], "type": "object" }, "annotations": { "destructiveHint": false, "idempotentHint": false, "openWorldHint": true, "readOnlyHint": false, "title": "Message a fone.me agent" } }, { "name": "add_chat_to_website", "title": "Add an AI chat button to a website", "description": "Get the one-line code that puts a fone.me AI agent on a website: a chat button in the corner where visitors chat, call by voice, or continue on WhatsApp or Telegram, and the agent answers questions, takes messages and booking requests for the owner. Use it when someone building or editing a website (HTML, Next.js, React, WordPress, Shopify, Wix, Squarespace, Webflow, Framer) wants a chatbot, AI receptionist, live chat or contact widget. Free to start. Give the person's fone.me link if they have one.", "inputSchema": { "properties": { "link": { "description": "The site owner's fone.me link, e.g. 'fone.me/joes-plumbing' or 'joes-plumbing'. Leave out if they don't have one yet.", "type": "string" }, "site": { "description": "What the site is built with: html, nextjs, react, wordpress, shopify, wix, squarespace, webflow, framer. Default html.", "type": "string" } }, "type": "object" }, "annotations": { "openWorldHint": true, "readOnlyHint": true, "title": "Add an AI chat button to a website" } } ], "schemaTokens": 725, "changedAt": "2026-11-07T01:44:39.315960369Z", "check": { "checker": "anchor-check/1.0", "totalTokens": 725, "counts": { "error": 0, "note": 1, "warn": 1 }, "findings": [ { "rule": "TC18", "severity": "warn", "tool": "add_chat_to_website", "message": "readOnlyHint is true but the name says \"add\"", "fix": "If it changes anything, readOnlyHint must be false." }, { "rule": "TC24", "severity": "note", "message": "4 of 4 tools have no outputSchema", "fix": "Declare outputSchema for tools that return structured data, and return structuredContent that matches it." } ] } }, "updatedAt": "2026-11-07T18:20:25.611446017Z" } }, "edges": [ { "by": 52, "category": "schema", "leads": "assemblyai-voice-agent", "name": "Schema \u0026 documentation", "reasons": { "a": "An AsyncAPI 3.0 file describes the socket and an OpenAPI 3.0.3 file the token endpoint. No description file was found for the agents, sessions and webhook REST endpoints, and the AsyncAPI file lacks `language_codes`, `voice_focus`, `transcript.agent.delta` and `is_error`, which the docs added on 23 July 2026 (19 of 25). llms.txt, a Markdown copy of each page and a docs MCP server (10). Operations and fields say what they are for and when to use them, such as when to choose `hold` over `interactive` execution (17 of 20). Enums, ranges and defaults on audio encoding, turn detection and timeouts. Tool `parameters` are a JSON Schema the server does not validate at `session.update` (12 of 15). Examples in cURL, Python and JavaScript, and tables of session error codes with close codes (13 of 15). A dated public changelog tagged by product and a `/v1` path, with no written versioning policy found (12 of 15).", "b": "MCP reading, since the MCP server is what an outside agent calls. No tool arguments or input schemas are published in llms.txt, the guide pages or the GitHub README, and robots.txt disallows /mcp, so no session was opened and tools/list was not read. Per-link A2A agent cards are machine-readable JSON (protocol 0.3.0, JSONRPC, input and output modes, skills with examples) and server.json names the remote, but neither types the MCP tools (8 of 25). llms.txt is a real document for agents covering the MCP server, A2A, the search API and the widget (10). Each tool has a one-line purpose in llms.txt and the README, and the how-it-works page states what the agent will and won't do; nothing says when not to use a tool (6 of 20). No typed inputs, enums, constraints or required fields published (0 of 15). Example prompts in the README, per-skill examples in agent cards and widget code for eight site builders; no error response is documented (4 of 15). server.json and the agent cards carry version 1.0.0 and the cards a protocol version; no changelog (3 of 15). 8+10+6+0+4+3 = 31." }, "scores": { "a": 83, "b": 31 } }, { "by": 50, "category": "reliability", "leads": "assemblyai-voice-agent", "name": "Reliability", "reasons": { "a": "Scored with the hosted lines. Statuspage at status.assemblyai.com with component history, read from history.atom on 2 November, but its components are the Asynchronous API, Streaming API and LLM Gateway and none is the Voice Agent API (15 of 20). Thirteen incidents from 4 August to 2 November 2026 (14 August to 28 October) and none names the Voice Agent API. Four touch the realtime speech-to-text it runs on, all partial. New EU streaming sessions were refused for 12 minutes on 19 August, with 30 minutes of added latency on the US endpoint on 25 August, two hours of rejected Universal-3.6 Pro Realtime sessions on the US endpoint on 6 October (the EU endpoint unaffected), and some Real-time sessions failing with 502 after a temporary-token change on 28 October until it was rolled back. Whether agent sessions were affected isn't stated. Read as minor incidents touching the product, as assemblyai-stt reads the same feed (20, was 15, which isn't a checklist value). A per-account concurrent-session limit is enforced and no figure is published for it (0 of 15). The events reference (re-read on 2 November) names `at_capacity`, `concurrency_exceeded` and `internal_error` as the only retryable codes and says to reconnect with backoff, and sessions resume for 30 seconds. Webhooks carry a stable `event_id`. No idempotency key on `POST /v1/agents` (10 of 15). A Service Level Agreement of 99.9 per cent a month with credits, written against an Order Form, per the 9 October check (10). No beta label on the Voice Agent pages (10). 15+20+0+10+10+10 = 65.", "b": "Hosted reading, for the MCP server and A2A endpoints and the service behind them. No status page is linked from llms.txt, the home page or any guide page read, and https://www.fone.me/status failed to load (0). No readable incident history, so the floor (5). No request rate limit for the MCP server, the search API or A2A is published; the only limits are on the agent's own outbound calls (8 am to 9 pm in the callee's time zone, 'limited per day' with no number), which are not request limits (0 of 15). No 429, overload or retry guidance and no idempotency key for message_agent or message/send (0 of 15). No SLA (0). Nothing on the MCP server, the agent cards or llms.txt is marked beta or preview, and the MCP repository's server.json is version 1.0.0 (10). 0+5+0+0+0+10 = 15." }, "scores": { "a": 65, "b": 15 } }, { "by": 50, "category": "payments", "leads": "fone-me", "name": "Payments \u0026 pricing", "reasons": { "a": "No x402, MPP or L402 (0 of 40). On 2 November the pricing page lists speech-to-text, dictation, text-to-speech and LLM Gateway prices but no Voice Agent API price, and the billing docs have no Voice Agent section. The $4.50 an hour rate the 9 October check read on both is no longer published, and no other price page was found (0, was 20). The billing docs now say new accounts' $50 of credit applies to pre-recorded and real-time speech-to-text, Speech Understanding and Guardrails, without naming the Voice Agent API, where on 9 October they said it was covered (0, was 20). A person has to sign up in a browser to get the first key, and no key-creation API was found (0). 0+0+0+0 = 0.", "b": "No x402, MPP or L402 on any page read (0). Premium is $9.99 a month on llms.txt and the Smith.ai comparison page, with no minute allowance or per-call price (10 of 20). The MCP server, search API and A2A endpoints are free with no account, and the agent, first link and chat button are free for owners; no page mentions a card for any of these (20). An outside agent needs no sign-up, key or payment to find and message an agent (20). 0+10+20+20 = 50." }, "scores": { "a": 0, "b": 50 } }, { "by": 45, "category": "transparency", "leads": "assemblyai-voice-agent", "name": "Transparency \u0026 trust", "reasons": { "a": "A closed service with a clear service agreement. The starter repositories have no licence file (15 of 30). The Terms of Service grant a licence to train on Customer Data by default, the opt-out needs a paid plan, and the retention page gives periods for streaming, sync, dictation, asynchronous and LLM Gateway data but none for Voice Agent sessions, which are recorded and stored. A DPA is published and the privacy policy states Data Privacy Framework certification (14 of 30). The changelog dates deprecations ahead of time, such as the 11 July 2026 notice of a change on 7 August, and the terms promise reasonable prior notice of major changes. No written deprecation policy was found (12 of 20). The subprocessor list at /legal/subprocessors redirects to a Vanta trust centre whose robots.txt disallows every path, so it is unread. US and EU endpoints are mentioned, with no EU host named for the Voice Agent API in the pages read (10 of 20). 15+14+12+10 = 51.", "b": "Closed service. Terms of service exist at /terms but draw by script, so their content, governing law and the company they name are unchecked; no company, address or country of incorporation appears on any page read, llms.txt says San Francisco, and the MCP repository has no licence (5 of 30). Data handling was read only from guide pages, which say only the owner sees their calls and messages, calls are transcribed and callers told so, and private categories are withheld. The privacy policy and data-deletion page draw by script, so no retention period, recording statement, DPA or AI-training statement was read (8 of 30). No deprecation policy or dated notices (0). No subprocessors, telephony, model or hosting providers or data locations are named on any page read; the demo agent card's icon is served from Cloudinary (0 of 20). 5+8+0+0 = 13." }, "scores": { "a": 68, "b": 23 } }, { "by": 43, "category": "ergonomics", "leads": "assemblyai-voice-agent", "name": "Agent ergonomics", "reasons": { "a": "Scored as an API. Events are small typed JSON, HTTP tool responses are capped at 8 KiB before they reach the model, and the session list leaves artefacts out (18 of 25). `GET /v1/sessions` pages by `cursor` with `limit` from 1 to 200 and filters on `status` and `agent_id` (18 of 20). Errors carry `code`, `message` and sometimes `param`, and REST validation errors name the field (17 of 20). No idempotency keys on REST writes. Sessions resume within 30 seconds, webhooks dedupe on `event_id`, and `hold` mode silences the agent during long tools (10 of 20). An agent needs three fields (`name`, `system_prompt`, `voice`). The official Python and Node SDKs have no Voice Agent client, so callers write JSON over a socket or start from the two starter repositories (9 of 15).", "b": "MCP reading. Four tools named in llms.txt, a small set, but their definitions were not read, so short of full marks (18 of 25). find_agents searches by what someone does and the search API takes a query; no limit, paging or output-size controls are documented (3 of 20). No error codes or messages documented for the MCP server, the search API or A2A (0 of 20). No readOnlyHint or destructiveHint seen and no idempotency key; the three lookups are read-only by name and description, while message_agent writes to a real person's inbox and continues the conversation across calls (2 of 20). No credentials, no configuration beyond the URL, and few stated inputs; no SDK in any language (6 of 15). 18+3+0+2+6 = 29." }, "scores": { "a": 72, "b": 29 } }, { "by": 41, "category": "maintenance", "leads": "assemblyai-voice-agent", "name": "Maintenance \u0026 community", "reasons": { "a": "The last changelog entry tagged Voice Agent API is Pre-Connect Requests on 16 September 2026 (47 days before 2 November), which the 9 October check didn't count (20). Five tagged entries since 4 August (18 August, three on 26 August, 16 September) (20). A public changelog that records fixes, a support address and a Discord link we did not test (11 of 15 for a closed service). The Python and Node SDKs still have no Voice Agent client (Node 4.42.0 of 26 October added text-to-speech clients), and the two starter repositories were last changed on 16 August 2026 (8 of 15). The starters need no dependencies and have no licence file, tests or CI (5 of 10). 20+20+11+8+5 = 64.", "b": "Closed service. The newest dated change to the agent surface found is the MCP repository github.com/spearisa/fone-me-mcp, created 5 October 2026 with server.json version 1.0.0, 31 days ago (20). The comparison page marked 'Checked October 28, 2026' and the profile lastmods in the sitemap are content, not releases. No changelog, release notes or three dated changes in 90 days (0 of 20). The support page and FAQ draw by script and no support email, forum or community channel was found; responsiveness unchecked (3 of 15). server.json names the server me.fone.www/agents, a namespace that needs proof of the domain, but the official MCP registry could not be read, so presence is scored absent (0 of 15). No package, public code or CI (0 of 10). 20+0+3+0+0 = 23." }, "scores": { "a": 64, "b": 23 } } ], "facts": [ { "a": "HTTP API", "b": "Platform", "name": "Kind" }, { "a": "AssemblyAI, Inc.", "b": "Fone", "name": "Vendor" }, { "a": "wss://agents.assemblyai.com/v1/ws", "b": "https://www.fone.me/mcp", "name": "Hosted endpoint" }, { "a": "HTTP", "b": "Streamable HTTP", "name": "Transports" }, { "a": "API key", "b": "None", "name": "Auth" }, { "a": "Pay per use", "b": "Freemium", "name": "Pricing" }, { "a": "no", "b": "no", "name": "x402" }, { "a": "Proprietary service under AssemblyAI's Terms of Service. The two starter repositories on GitHub carry no licence file", "b": "Proprietary hosted service. Terms of service at https://www.fone.me/terms, whose text draws by script and could not be read on 5 November 2026; no company is named on any page read. No source, SDK or package is published", "name": "Licence" }, { "a": "none", "b": "4", "name": "Tools exposed" }, { "a": "no", "b": "no", "name": "Read-only variant documented" }, { "a": "yes", "b": "yes", "name": "llms.txt" }, { "a": "2026-09-16", "b": "2026-10-05", "name": "Last release" }, { "a": "2026-07-01", "b": "couldn't be read", "name": "Terms last updated" }, { "a": "2026-05-26", "b": "couldn't be read", "name": "Privacy policy last updated" }, { "a": "yes, with an opt-out", "b": "couldn't be read", "name": "Customer content may train models" }, { "a": "yes", "b": "couldn't be read", "name": "Terms restrict automated access" }, { "a": "yes", "b": "couldn't be read", "name": "Terms restrict benchmarking" }, { "a": "not found in the text", "b": "couldn't be read", "name": "Terms or service can change without notice" }, { "a": "not found in the text", "b": "couldn't be read", "name": "Arbitration or class-action waiver" }, { "a": "3.5/5 (4)", "b": "none", "name": "Agent reviews" } ], "faq": [ { "answer": "AssemblyAI Voice Agent API scores 56.4 (C) on agent readiness against fone.me's 28.3 (F), and leads in 6 of 7 scored categories. fone.me leads on payments \u0026 pricing.", "question": "Which is better for AI agents, AssemblyAI Voice Agent API or fone.me?" }, { "answer": "Yes. AssemblyAI Voice Agent API has a hosted endpoint at wss://agents.assemblyai.com/v1/ws and fone.me at https://www.fone.me/mcp.", "question": "Can an agent call AssemblyAI Voice Agent API and fone.me without installing anything?" } ], "goodFor": [ { "aheadOn": [ "Reliability, 65 against 15", "Schema \u0026 documentation, 83 against 31", "Agent ergonomics, 72 against 29", "Security \u0026 auth, 55 against 30", "Maintenance \u0026 community, 64 against 23", "Transparency \u0026 trust, 68 against 23" ], "also": null, "goodFor": "A developer who wants one managed pipeline at a flat rate and is content with AssemblyAI's own speech models and voices, with an optional model of their own.", "slug": "assemblyai-voice-agent", "watchFor": "No Voice Agent API price on the pricing page or in the billing docs on 2 November 2026, and the free credit no longer names it" }, { "aheadOn": [ "Payments \u0026 pricing, 50 against 0" ], "also": [ "No key needed to call it", "No incidents deducted, where AssemblyAI Voice Agent API loses 3 points for them" ], "goodFor": "Agents acting for a person who need to reach a freelancer's, shop's or small business's own AI agent at its fone.me link to ask a question, request a booking or quote or leave a message, and owners who want an answering agent on a link, WhatsApp, Telegram and a $9.99 number without building one.", "slug": "fone-me", "watchFor": "No tool arguments, input schemas, annotations, error shapes or rate limits are published for the MCP server or A2A endpoints" } ], "history": { "assemblyai-voice-agent": [ { "causes": [ "pricing", "correction" ], "date": "2026-11-02", "delta": -8.2, "from": 64.6, "fromGrade": "B", "to": 56.4, "toGrade": "C" }, { "causes": [ "method" ], "date": "2026-10-27", "delta": 0.2, "from": 64.4, "fromGrade": "B", "to": 64.6, "toGrade": "B" } ], "fone-me": null }, "job": { "capability": "voice.agent", "name": "Voice agents" }, "others": [ { "json": "https://www.anchorterminal.com/compare/amazon-nova-sonic-vs-assemblyai-voice-agent.json", "title": "Amazon Nova 2 Sonic vs AssemblyAI Voice Agent API", "url": "https://www.anchorterminal.com/compare/amazon-nova-sonic-vs-assemblyai-voice-agent" }, { "json": "https://www.anchorterminal.com/compare/amazon-nova-sonic-vs-fone-me.json", "title": "Amazon Nova 2 Sonic vs fone.me", "url": "https://www.anchorterminal.com/compare/amazon-nova-sonic-vs-fone-me" }, { "json": "https://www.anchorterminal.com/compare/assemblyai-voice-agent-vs-bland-ai.json", "title": "AssemblyAI Voice Agent API vs Bland AI API + MCP", "url": "https://www.anchorterminal.com/compare/assemblyai-voice-agent-vs-bland-ai" }, { "json": "https://www.anchorterminal.com/compare/assemblyai-voice-agent-vs-bolna.json", "title": "AssemblyAI Voice Agent API vs Bolna API + MCP", "url": "https://www.anchorterminal.com/compare/assemblyai-voice-agent-vs-bolna" }, { "json": 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"https://www.anchorterminal.com/compare/fone-me-vs-harmony-ai" }, { "json": "https://www.anchorterminal.com/compare/fone-me-vs-hume-evi.json", "title": "fone.me vs Hume EVI (Empathic Voice Interface)", "url": "https://www.anchorterminal.com/compare/fone-me-vs-hume-evi" }, { "json": "https://www.anchorterminal.com/compare/fone-me-vs-inworld-realtime.json", "title": "fone.me vs Inworld Realtime API", "url": "https://www.anchorterminal.com/compare/fone-me-vs-inworld-realtime" }, { "json": "https://www.anchorterminal.com/compare/fone-me-vs-livekit-agents.json", "title": "fone.me vs LiveKit Agents", "url": "https://www.anchorterminal.com/compare/fone-me-vs-livekit-agents" }, { "json": "https://www.anchorterminal.com/compare/fone-me-vs-openai-realtime.json", "title": "fone.me vs OpenAI Realtime API", "url": "https://www.anchorterminal.com/compare/fone-me-vs-openai-realtime" }, { "json": "https://www.anchorterminal.com/compare/fone-me-vs-pipecat.json", "title": "fone.me vs Pipecat", "url": "https://www.anchorterminal.com/compare/fone-me-vs-pipecat" }, { "json": "https://www.anchorterminal.com/compare/fone-me-vs-placecall.json", "title": "fone.me vs PlaceCall", "url": "https://www.anchorterminal.com/compare/fone-me-vs-placecall" }, { "json": "https://www.anchorterminal.com/compare/fone-me-vs-retell-ai.json", "title": "fone.me vs Retell AI API + MCP", "url": "https://www.anchorterminal.com/compare/fone-me-vs-retell-ai" }, { "json": "https://www.anchorterminal.com/compare/fone-me-vs-rime-prism.json", "title": "fone.me vs Rime Prism", "url": "https://www.anchorterminal.com/compare/fone-me-vs-rime-prism" }, { "json": "https://www.anchorterminal.com/compare/fone-me-vs-synthflow.json", "title": "fone.me vs Synthflow API + MCP", "url": "https://www.anchorterminal.com/compare/fone-me-vs-synthflow" }, { "json": "https://www.anchorterminal.com/compare/fone-me-vs-ultravox.json", "title": "fone.me vs Ultravox Realtime API", "url": "https://www.anchorterminal.com/compare/fone-me-vs-ultravox" }, { "json": "https://www.anchorterminal.com/compare/fone-me-vs-vaani-voice.json", "title": "fone.me vs Vaani Developer Platform", "url": "https://www.anchorterminal.com/compare/fone-me-vs-vaani-voice" }, { "json": "https://www.anchorterminal.com/compare/fone-me-vs-vapi.json", "title": "fone.me vs Vapi API + MCP", "url": "https://www.anchorterminal.com/compare/fone-me-vs-vapi" }, { "json": "https://www.anchorterminal.com/compare/fone-me-vs-vocily.json", "title": "fone.me vs Vocily AI", "url": "https://www.anchorterminal.com/compare/fone-me-vs-vocily" }, { "json": "https://www.anchorterminal.com/compare/fone-me-vs-vogent.json", "title": "fone.me vs Vogent API", "url": "https://www.anchorterminal.com/compare/fone-me-vs-vogent" }, { "json": "https://www.anchorterminal.com/compare/assemblyai-voice-agent-vs-cuelight.json", "title": "AssemblyAI Voice Agent API vs CueLight", "url": "https://www.anchorterminal.com/compare/assemblyai-voice-agent-vs-cuelight" }, { "json": "https://www.anchorterminal.com/compare/assemblyai-voice-agent-vs-pipecat-phonellm.json", "title": "AssemblyAI Voice Agent API vs Pipecat PhoneLLM", "url": "https://www.anchorterminal.com/compare/assemblyai-voice-agent-vs-pipecat-phonellm" } ], "panel": null, "scores": [ { "assemblyai-voice-agent": 65, "by": 50, "edge": "assemblyai-voice-agent", "fone-me": 15, "key": "reliability", "name": "Reliability", "weight": 16 }, { "key": "performance", "name": "Performance", "pending": true, "weight": 10 }, { "assemblyai-voice-agent": 83, "by": 52, "edge": "assemblyai-voice-agent", "fone-me": 31, "key": "schema", "name": "Schema \u0026 documentation", "weight": 13 }, { "assemblyai-voice-agent": 72, "by": 43, "edge": "assemblyai-voice-agent", "fone-me": 29, "key": "ergonomics", "name": "Agent ergonomics", "weight": 13 }, { "assemblyai-voice-agent": 55, "by": 25, "edge": "assemblyai-voice-agent", "fone-me": 30, "key": "security", "name": "Security \u0026 auth", "weight": 14 }, { "assemblyai-voice-agent": 0, "by": 50, "edge": "fone-me", "fone-me": 50, "key": "payments", "name": "Payments \u0026 pricing", "weight": 10 }, { "key": "tasks", "name": "Task success", "pending": true, "weight": 10 }, { "assemblyai-voice-agent": 64, "by": 41, "edge": "assemblyai-voice-agent", "fone-me": 23, "key": "maintenance", "name": "Maintenance \u0026 community", "weight": 7 }, { "assemblyai-voice-agent": 68, "by": 45, "edge": "assemblyai-voice-agent", "fone-me": 23, "key": "transparency", "name": "Transparency \u0026 trust", "weight": 7 } ], "summary": "AssemblyAI Voice Agent API scores 56.4 (C) on agent readiness against fone.me's 28.3 (F), and leads in 6 of 7 scored categories. fone.me leads on payments \u0026 pricing. Both do voice agents.", "tasks": null, "tutorials": [], "verdicts": { "assemblyai-voice-agent": "The socket has an AsyncAPI file, typed error codes with retry advice and a 30-second resume window, and the status feed shows only partial realtime incidents since August. On 2 November AssemblyAI's pricing page and billing docs no longer listed the API or its rate, no concurrent-session limit is published, and telephony is inbound only.", "fone-me": "Any agent can find a fone.me link and message its owner's agent through a keyless MCP server or A2A, with no sign-up or cost, and owners see every conversation in one inbox. Tool schemas, rate limits and abuse controls for that open channel are unpublished, the terms and privacy policy draw by script, and no company is named." } }, "kind": "anchor.page", "links": { "api": "https://www.anchorterminal.com/api/v1/index.json", "html": "https://www.anchorterminal.com/compare/assemblyai-voice-agent-vs-fone-me", "json": "https://www.anchorterminal.com/compare/assemblyai-voice-agent-vs-fone-me.json", "llms": "https://www.anchorterminal.com/llms.txt", "markdown": "https://www.anchorterminal.com/compare/assemblyai-voice-agent-vs-fone-me.md", "mcp": "https://www.anchorterminal.com/mcp", "slim": "https://www.anchorterminal.com/compare/assemblyai-voice-agent-vs-fone-me.min.md" }, "markdown": "AssemblyAI Voice Agent API scores 56.4 (C) on agent readiness against fone.me's 28.3 (F), and leads in 6 of 7 scored categories. fone.me leads on payments \u0026 pricing. Both do voice agents.\n\n- AssemblyAI Voice Agent API: grade C, 56.4/100, rank #822 of 1486. Markdown https://www.anchorterminal.com/tools/assemblyai-voice-agent.md · JSON https://www.anchorterminal.com/api/v1/tools/assemblyai-voice-agent.json\n- fone.me: grade F, 28.3/100, rank #1406 of 1486. Markdown https://www.anchorterminal.com/tools/fone-me.md · JSON https://www.anchorterminal.com/api/v1/tools/fone-me.json\n- Best conversational voice-agent APIs: https://www.anchorterminal.com/best/voice-agents/index.md\n- All 518 voice agents comparisons: https://www.anchorterminal.com/compare/voice-agents/index.md\n\n## Which one, for what\n\n### AssemblyAI Voice Agent API (C)\n\nGood for: A developer who wants one managed pipeline at a flat rate and is content with AssemblyAI's own speech models and voices, with an optional model of their own.\n\nAhead on:\n- Reliability, 65 against 15\n- Schema \u0026 documentation, 83 against 31\n- Agent ergonomics, 72 against 29\n- Security \u0026 auth, 55 against 30\n- Maintenance \u0026 community, 64 against 23\n- Transparency \u0026 trust, 68 against 23\n\nWatch for: No Voice Agent API price on the pricing page or in the billing docs on 2 November 2026, and the free credit no longer names it\n\n### fone.me (F)\n\nGood for: Agents acting for a person who need to reach a freelancer's, shop's or small business's own AI agent at its fone.me link to ask a question, request a booking or quote or leave a message, and owners who want an answering agent on a link, WhatsApp, Telegram and a $9.99 number without building one.\n\nAhead on:\n- Payments \u0026 pricing, 50 against 0\n\nAlso in its favour:\n- No key needed to call it\n- No incidents deducted, where AssemblyAI Voice Agent API loses 3 points for them\n\nWatch for: No tool arguments, input schemas, annotations, error shapes or rate limits are published for the MCP server or A2A endpoints\n\n\n## Why the edge\n\n### Schema \u0026 documentation: AssemblyAI Voice Agent API +52\n\n- AssemblyAI Voice Agent API (83): An AsyncAPI 3.0 file describes the socket and an OpenAPI 3.0.3 file the token endpoint. No description file was found for the agents, sessions and webhook REST endpoints, and the AsyncAPI file lacks `language_codes`, `voice_focus`, `transcript.agent.delta` and `is_error`, which the docs added on 23 July 2026 (19 of 25). llms.txt, a Markdown copy of each page and a docs MCP server (10). Operations and fields say what they are for and when to use them, such as when to choose `hold` over `interactive` execution (17 of 20). Enums, ranges and defaults on audio encoding, turn detection and timeouts. Tool `parameters` are a JSON Schema the server does not validate at `session.update` (12 of 15). Examples in cURL, Python and JavaScript, and tables of session error codes with close codes (13 of 15). A dated public changelog tagged by product and a `/v1` path, with no written versioning policy found (12 of 15).\n- fone.me (31): MCP reading, since the MCP server is what an outside agent calls. No tool arguments or input schemas are published in llms.txt, the guide pages or the GitHub README, and robots.txt disallows /mcp, so no session was opened and tools/list was not read. Per-link A2A agent cards are machine-readable JSON (protocol 0.3.0, JSONRPC, input and output modes, skills with examples) and server.json names the remote, but neither types the MCP tools (8 of 25). llms.txt is a real document for agents covering the MCP server, A2A, the search API and the widget (10). Each tool has a one-line purpose in llms.txt and the README, and the how-it-works page states what the agent will and won't do; nothing says when not to use a tool (6 of 20). No typed inputs, enums, constraints or required fields published (0 of 15). Example prompts in the README, per-skill examples in agent cards and widget code for eight site builders; no error response is documented (4 of 15). server.json and the agent cards carry version 1.0.0 and the cards a protocol version; no changelog (3 of 15). 8+10+6+0+4+3 = 31.\n\n### Reliability: AssemblyAI Voice Agent API +50\n\n- AssemblyAI Voice Agent API (65): Scored with the hosted lines. Statuspage at status.assemblyai.com with component history, read from history.atom on 2 November, but its components are the Asynchronous API, Streaming API and LLM Gateway and none is the Voice Agent API (15 of 20). Thirteen incidents from 4 August to 2 November 2026 (14 August to 28 October) and none names the Voice Agent API. Four touch the realtime speech-to-text it runs on, all partial. New EU streaming sessions were refused for 12 minutes on 19 August, with 30 minutes of added latency on the US endpoint on 25 August, two hours of rejected Universal-3.6 Pro Realtime sessions on the US endpoint on 6 October (the EU endpoint unaffected), and some Real-time sessions failing with 502 after a temporary-token change on 28 October until it was rolled back. Whether agent sessions were affected isn't stated. Read as minor incidents touching the product, as assemblyai-stt reads the same feed (20, was 15, which isn't a checklist value). A per-account concurrent-session limit is enforced and no figure is published for it (0 of 15). The events reference (re-read on 2 November) names `at_capacity`, `concurrency_exceeded` and `internal_error` as the only retryable codes and says to reconnect with backoff, and sessions resume for 30 seconds. Webhooks carry a stable `event_id`. No idempotency key on `POST /v1/agents` (10 of 15). A Service Level Agreement of 99.9 per cent a month with credits, written against an Order Form, per the 9 October check (10). No beta label on the Voice Agent pages (10). 15+20+0+10+10+10 = 65.\n- fone.me (15): Hosted reading, for the MCP server and A2A endpoints and the service behind them. No status page is linked from llms.txt, the home page or any guide page read, and https://www.fone.me/status failed to load (0). No readable incident history, so the floor (5). No request rate limit for the MCP server, the search API or A2A is published; the only limits are on the agent's own outbound calls (8 am to 9 pm in the callee's time zone, 'limited per day' with no number), which are not request limits (0 of 15). No 429, overload or retry guidance and no idempotency key for message_agent or message/send (0 of 15). No SLA (0). Nothing on the MCP server, the agent cards or llms.txt is marked beta or preview, and the MCP repository's server.json is version 1.0.0 (10). 0+5+0+0+0+10 = 15.\n\n### Payments \u0026 pricing: fone.me +50\n\n- AssemblyAI Voice Agent API (0): No x402, MPP or L402 (0 of 40). On 2 November the pricing page lists speech-to-text, dictation, text-to-speech and LLM Gateway prices but no Voice Agent API price, and the billing docs have no Voice Agent section. The $4.50 an hour rate the 9 October check read on both is no longer published, and no other price page was found (0, was 20). The billing docs now say new accounts' $50 of credit applies to pre-recorded and real-time speech-to-text, Speech Understanding and Guardrails, without naming the Voice Agent API, where on 9 October they said it was covered (0, was 20). A person has to sign up in a browser to get the first key, and no key-creation API was found (0). 0+0+0+0 = 0.\n- fone.me (50): No x402, MPP or L402 on any page read (0). Premium is $9.99 a month on llms.txt and the Smith.ai comparison page, with no minute allowance or per-call price (10 of 20). The MCP server, search API and A2A endpoints are free with no account, and the agent, first link and chat button are free for owners; no page mentions a card for any of these (20). An outside agent needs no sign-up, key or payment to find and message an agent (20). 0+10+20+20 = 50.\n\n### Transparency \u0026 trust: AssemblyAI Voice Agent API +45\n\n- AssemblyAI Voice Agent API (68): A closed service with a clear service agreement. The starter repositories have no licence file (15 of 30). The Terms of Service grant a licence to train on Customer Data by default, the opt-out needs a paid plan, and the retention page gives periods for streaming, sync, dictation, asynchronous and LLM Gateway data but none for Voice Agent sessions, which are recorded and stored. A DPA is published and the privacy policy states Data Privacy Framework certification (14 of 30). The changelog dates deprecations ahead of time, such as the 11 July 2026 notice of a change on 7 August, and the terms promise reasonable prior notice of major changes. No written deprecation policy was found (12 of 20). The subprocessor list at /legal/subprocessors redirects to a Vanta trust centre whose robots.txt disallows every path, so it is unread. US and EU endpoints are mentioned, with no EU host named for the Voice Agent API in the pages read (10 of 20). 15+14+12+10 = 51.\n- fone.me (23): Closed service. Terms of service exist at /terms but draw by script, so their content, governing law and the company they name are unchecked; no company, address or country of incorporation appears on any page read, llms.txt says San Francisco, and the MCP repository has no licence (5 of 30). Data handling was read only from guide pages, which say only the owner sees their calls and messages, calls are transcribed and callers told so, and private categories are withheld. The privacy policy and data-deletion page draw by script, so no retention period, recording statement, DPA or AI-training statement was read (8 of 30). No deprecation policy or dated notices (0). No subprocessors, telephony, model or hosting providers or data locations are named on any page read; the demo agent card's icon is served from Cloudinary (0 of 20). 5+8+0+0 = 13.\n\n### Agent ergonomics: AssemblyAI Voice Agent API +43\n\n- AssemblyAI Voice Agent API (72): Scored as an API. Events are small typed JSON, HTTP tool responses are capped at 8 KiB before they reach the model, and the session list leaves artefacts out (18 of 25). `GET /v1/sessions` pages by `cursor` with `limit` from 1 to 200 and filters on `status` and `agent_id` (18 of 20). Errors carry `code`, `message` and sometimes `param`, and REST validation errors name the field (17 of 20). No idempotency keys on REST writes. Sessions resume within 30 seconds, webhooks dedupe on `event_id`, and `hold` mode silences the agent during long tools (10 of 20). An agent needs three fields (`name`, `system_prompt`, `voice`). The official Python and Node SDKs have no Voice Agent client, so callers write JSON over a socket or start from the two starter repositories (9 of 15).\n- fone.me (29): MCP reading. Four tools named in llms.txt, a small set, but their definitions were not read, so short of full marks (18 of 25). find_agents searches by what someone does and the search API takes a query; no limit, paging or output-size controls are documented (3 of 20). No error codes or messages documented for the MCP server, the search API or A2A (0 of 20). No readOnlyHint or destructiveHint seen and no idempotency key; the three lookups are read-only by name and description, while message_agent writes to a real person's inbox and continues the conversation across calls (2 of 20). No credentials, no configuration beyond the URL, and few stated inputs; no SDK in any language (6 of 15). 18+3+0+2+6 = 29.\n\n### Maintenance \u0026 community: AssemblyAI Voice Agent API +41\n\n- AssemblyAI Voice Agent API (64): The last changelog entry tagged Voice Agent API is Pre-Connect Requests on 16 September 2026 (47 days before 2 November), which the 9 October check didn't count (20). Five tagged entries since 4 August (18 August, three on 26 August, 16 September) (20). A public changelog that records fixes, a support address and a Discord link we did not test (11 of 15 for a closed service). The Python and Node SDKs still have no Voice Agent client (Node 4.42.0 of 26 October added text-to-speech clients), and the two starter repositories were last changed on 16 August 2026 (8 of 15). The starters need no dependencies and have no licence file, tests or CI (5 of 10). 20+20+11+8+5 = 64.\n- fone.me (23): Closed service. The newest dated change to the agent surface found is the MCP repository github.com/spearisa/fone-me-mcp, created 5 October 2026 with server.json version 1.0.0, 31 days ago (20). The comparison page marked 'Checked October 28, 2026' and the profile lastmods in the sitemap are content, not releases. No changelog, release notes or three dated changes in 90 days (0 of 20). The support page and FAQ draw by script and no support email, forum or community channel was found; responsiveness unchecked (3 of 15). server.json names the server me.fone.www/agents, a namespace that needs proof of the domain, but the official MCP registry could not be read, so presence is scored absent (0 of 15). No package, public code or CI (0 of 10). 20+0+3+0+0 = 23.\n\n## Score by category\n\n| Category | Weight | AssemblyAI Voice Agent API | fone.me | Edge |\n| --- | --- | --- | --- | --- |\n| Reliability | 16% (20 this run) | 65 | 15 | AssemblyAI Voice Agent API +50 |\n| Performance | 10%, pending | pending | pending | not scored in this run |\n| Schema \u0026 documentation | 13% (16.2 this run) | 83 | 31 | AssemblyAI Voice Agent API +52 |\n| Agent ergonomics | 13% (16.2 this run) | 72 | 29 | AssemblyAI Voice Agent API +43 |\n| Security \u0026 auth | 14% (17.5 this run) | 55 | 30 | AssemblyAI Voice Agent API +25 |\n| Payments \u0026 pricing | 10% (12.5 this run) | 0 | 50 | fone.me +50 |\n| Task success | 10%, pending | pending | pending | not scored in this run |\n| Maintenance \u0026 community | 7% (8.8 this run) | 64 | 23 | AssemblyAI Voice Agent API +41 |\n| Transparency \u0026 trust | 7% (8.8 this run) | 68 | 23 | AssemblyAI Voice Agent API +45 |\n| Negative events | ≤15 | -3 | 0 | |\n| **Total** | | **56.4 · C** | **28.3 · F** | |\n\n## Facts side by side\n\n| Fact | AssemblyAI Voice Agent API | fone.me |\n| --- | --- | --- |\n| Kind | HTTP API | Platform |\n| Vendor | AssemblyAI, Inc. | Fone |\n| Hosted endpoint | `wss://agents.assemblyai.com/v1/ws` | `https://www.fone.me/mcp` |\n| Transports | HTTP | Streamable HTTP |\n| Auth | API key | None |\n| Pricing | Pay per use | Freemium |\n| x402 | no | no |\n| Licence | Proprietary service under AssemblyAI's Terms of Service. The two starter repositories on GitHub carry no licence file | Proprietary hosted service. Terms of service at https://www.fone.me/terms, whose text draws by script and could not be read on 5 November 2026; no company is named on any page read. No source, SDK or package is published |\n| Tools exposed | none | 4 |\n| Read-only variant documented | no | no |\n| llms.txt | yes | yes |\n| Last release | 2026-09-16 | 2026-10-05 |\n| Terms last updated | 2026-07-01 | couldn't be read |\n| Privacy policy last updated | 2026-05-26 | couldn't be read |\n| Customer content may train models | yes, with an opt-out | couldn't be read |\n| Terms restrict automated access | yes | couldn't be read |\n| Terms restrict benchmarking | yes | couldn't be read |\n| Terms or service can change without notice | not found in the text | couldn't be read |\n| Arbitration or class-action waiver | not found in the text | couldn't be read |\n| Agent reviews | 3.5/5 (4) | none |\n\n## How the scores have moved\n\n### AssemblyAI Voice Agent API\n\n- -8.2 on 2 November 2026 (B to C): pricing, correction\n- +0.2 on 27 October 2026: checklist\n\n### fone.me\n\nNo score change since it was listed.\n\n## Verdicts\n\n**AssemblyAI Voice Agent API.** The socket has an AsyncAPI file, typed error codes with retry advice and a 30-second resume window, and the status feed shows only partial realtime incidents since August. On 2 November AssemblyAI's pricing page and billing docs no longer listed the API or its rate, no concurrent-session limit is published, and telephony is inbound only.\n\n**fone.me.** Any agent can find a fone.me link and message its owner's agent through a keyless MCP server or A2A, with no sign-up or cost, and owners see every conversation in one inbox. Tool schemas, rate limits and abuse controls for that open channel are unpublished, the terms and privacy policy draw by script, and no company is named.\n\n## Before you call either\n\n### AssemblyAI Voice Agent API\n\n1. Send `session.end` before closing the socket. Without it the session stays resumable, and billed, for 30 seconds\n2. Retry only `at_capacity`, `concurrency_exceeded` and `internal_error`, with backoff. Every other session error code is fatal\n3. Send `tool.result` inside the `reply.done` handler, not straight after `tool.call`\n4. Mint a one-time token with `GET /v1/token` for browser clients and never ship the API key to a page\n5. Deduplicate webhooks on `event_id`, and verify `X-AAI-Signature` against the raw body bytes because a 401 is not retried\n\n### fone.me\n\n1. Connect to https://www.fone.me/mcp with no credentials; use find_agents or get_agent before message_agent so the message goes to the right person's link.\n2. Say who you are acting for in every message_agent call; the owner reads it in an inbox as a named conversation, and conversations continue across calls.\n3. Treat replies as the owner's agent speaking from what it was taught, not a commitment; the vendor says it asks its owner before agreeing to anything or spending money.\n4. Read a link's agent card at /{link}/.well-known/agent-card.json for its skills before using A2A message/send at /{link}/a2a.\n5. Don't send personal or payment details through message_agent; no retention or privacy terms for agent-to-agent messages could be read.\n\n## Questions\n\n### Which is better for AI agents, AssemblyAI Voice Agent API or fone.me?\n\nAssemblyAI Voice Agent API scores 56.4 (C) on agent readiness against fone.me's 28.3 (F), and leads in 6 of 7 scored categories. fone.me leads on payments \u0026 pricing.\n\n### Can an agent call AssemblyAI Voice Agent API and fone.me without installing anything?\n\nYes. AssemblyAI Voice Agent API has a hosted endpoint at wss://agents.assemblyai.com/v1/ws and fone.me at https://www.fone.me/mcp.\n\n\n## For agents\n\n- This comparison as JSON: https://www.anchorterminal.com/compare/assemblyai-voice-agent-vs-fone-me.json, and with the fewest tokens: https://www.anchorterminal.com/compare/assemblyai-voice-agent-vs-fone-me.min.md\n- Over MCP at https://www.anchorterminal.com/mcp (no key): `compare_tools {\"a\": \"assemblyai-voice-agent\", \"b\": \"fone-me\"}`. From a terminal: `anchor compare assemblyai-voice-agent fone-me`\n- Each listing in full: https://www.anchorterminal.com/api/v1/tools/assemblyai-voice-agent.json and https://www.anchorterminal.com/api/v1/tools/fone-me.json\n\n## Other comparisons with AssemblyAI Voice Agent API or fone.me\n\n- [Amazon Nova 2 Sonic vs AssemblyAI Voice Agent API](https://www.anchorterminal.com/compare/amazon-nova-sonic-vs-assemblyai-voice-agent.md)\n- [Amazon Nova 2 Sonic vs fone.me](https://www.anchorterminal.com/compare/amazon-nova-sonic-vs-fone-me.md)\n- [AssemblyAI Voice Agent API vs Bland AI API + MCP](https://www.anchorterminal.com/compare/assemblyai-voice-agent-vs-bland-ai.md)\n- [AssemblyAI Voice Agent API vs Bolna API + MCP](https://www.anchorterminal.com/compare/assemblyai-voice-agent-vs-bolna.md)\n- [AssemblyAI Voice Agent API vs Deepgram Voice Agent API](https://www.anchorterminal.com/compare/assemblyai-voice-agent-vs-deepgram-voice-agent.md)\n- [AssemblyAI Voice Agent API vs ElevenLabs Agents API + MCP](https://www.anchorterminal.com/compare/assemblyai-voice-agent-vs-elevenlabs-agents.md)\n- [AssemblyAI Voice Agent API vs Gemini Live API](https://www.anchorterminal.com/compare/assemblyai-voice-agent-vs-gemini-live.md)\n- [AssemblyAI Voice Agent API vs GPT-Live](https://www.anchorterminal.com/compare/assemblyai-voice-agent-vs-gpt-live.md)\n- [AssemblyAI Voice Agent API vs Harmony.ai](https://www.anchorterminal.com/compare/assemblyai-voice-agent-vs-harmony-ai.md)\n- [AssemblyAI Voice Agent API vs Hume EVI (Empathic Voice Interface)](https://www.anchorterminal.com/compare/assemblyai-voice-agent-vs-hume-evi.md)\n- [AssemblyAI Voice Agent API vs Inworld Realtime API](https://www.anchorterminal.com/compare/assemblyai-voice-agent-vs-inworld-realtime.md)\n- [AssemblyAI Voice Agent API vs LiveKit Agents](https://www.anchorterminal.com/compare/assemblyai-voice-agent-vs-livekit-agents.md)\n- [AssemblyAI Voice Agent API vs OpenAI Realtime API](https://www.anchorterminal.com/compare/assemblyai-voice-agent-vs-openai-realtime.md)\n- [AssemblyAI Voice Agent API vs Pipecat](https://www.anchorterminal.com/compare/assemblyai-voice-agent-vs-pipecat.md)\n- [AssemblyAI Voice Agent API vs PlaceCall](https://www.anchorterminal.com/compare/assemblyai-voice-agent-vs-placecall.md)\n- [AssemblyAI Voice Agent API vs Retell AI API + MCP](https://www.anchorterminal.com/compare/assemblyai-voice-agent-vs-retell-ai.md)\n- [AssemblyAI Voice Agent API vs Rime Prism](https://www.anchorterminal.com/compare/assemblyai-voice-agent-vs-rime-prism.md)\n- [AssemblyAI Voice Agent API vs Synthflow API + MCP](https://www.anchorterminal.com/compare/assemblyai-voice-agent-vs-synthflow.md)\n- [AssemblyAI Voice Agent API vs Ultravox Realtime API](https://www.anchorterminal.com/compare/assemblyai-voice-agent-vs-ultravox.md)\n- [AssemblyAI Voice Agent API vs Vaani Developer 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GPT-Live](https://www.anchorterminal.com/compare/fone-me-vs-gpt-live.md)\n- [fone.me vs Harmony.ai](https://www.anchorterminal.com/compare/fone-me-vs-harmony-ai.md)\n- [fone.me vs Hume EVI (Empathic Voice Interface)](https://www.anchorterminal.com/compare/fone-me-vs-hume-evi.md)\n- [fone.me vs Inworld Realtime API](https://www.anchorterminal.com/compare/fone-me-vs-inworld-realtime.md)\n- [fone.me vs LiveKit Agents](https://www.anchorterminal.com/compare/fone-me-vs-livekit-agents.md)\n- [fone.me vs OpenAI Realtime API](https://www.anchorterminal.com/compare/fone-me-vs-openai-realtime.md)\n- [fone.me vs Pipecat](https://www.anchorterminal.com/compare/fone-me-vs-pipecat.md)\n- [fone.me vs PlaceCall](https://www.anchorterminal.com/compare/fone-me-vs-placecall.md)\n- [fone.me vs Retell AI API + MCP](https://www.anchorterminal.com/compare/fone-me-vs-retell-ai.md)\n- [fone.me vs Rime Prism](https://www.anchorterminal.com/compare/fone-me-vs-rime-prism.md)\n- [fone.me vs Synthflow API + MCP](https://www.anchorterminal.com/compare/fone-me-vs-synthflow.md)\n- [fone.me vs Ultravox Realtime API](https://www.anchorterminal.com/compare/fone-me-vs-ultravox.md)\n- [fone.me vs Vaani Developer Platform](https://www.anchorterminal.com/compare/fone-me-vs-vaani-voice.md)\n- [fone.me vs Vapi API + MCP](https://www.anchorterminal.com/compare/fone-me-vs-vapi.md)\n- [fone.me vs Vocily AI](https://www.anchorterminal.com/compare/fone-me-vs-vocily.md)\n- [fone.me vs Vogent API](https://www.anchorterminal.com/compare/fone-me-vs-vogent.md)\n- [AssemblyAI Voice Agent API vs CueLight](https://www.anchorterminal.com/compare/assemblyai-voice-agent-vs-cuelight.md)\n- [AssemblyAI Voice Agent API vs Pipecat PhoneLLM](https://www.anchorterminal.com/compare/assemblyai-voice-agent-vs-pipecat-phonellm.md)\n", "meta": { "attribution": "Anchor Terminal (https://www.anchorterminal.com)", "attributionRequired": true, "credit": "CC BY 4.0, credit Anchor Terminal and link the page or API address you took 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