{ "data": { "a": { "slug": "rime-prism", "name": "Rime Prism", "vendor": "Rime Labs", "vendorUrl": "https://www.rime.ai/prism", "kind": "http-api", "category": "voice-agents", "summary": "Prism is Rime's speech-to-speech model for voice agents. It takes caller audio over one WebSocket, decides when the caller has finished, calls the developer's tools and replies in speech with matching text, in English.", "url": "https://www.anchorterminal.com/tools/rime-prism", "markdownUrl": "https://www.anchorterminal.com/tools/rime-prism.md", "slimMarkdownUrl": "https://www.anchorterminal.com/tools/rime-prism.min.md", "jsonUrl": "https://www.anchorterminal.com/api/v1/tools/rime-prism.json", "license": "Proprietary hosted service under Rime's terms. The Rime SDK used to call it (github.com/rimelabs/rime-sdk) is MIT.", "transports": [ "websocket" ], "remoteUrl": "wss://prism.api.rime.ai/v1/realtime", "packages": [ { "registry": "pypi", "name": "rimelabs-sdk" }, { "registry": "npm", "name": "@rimelabs/sdk" }, { "registry": "go", "name": "github.com/rimelabs/rime-sdk/go" }, { "registry": "cargo", "name": "rimelabs-sdk" } ], "auth": "api-key", "authNotes": "Rime API key from the dashboard, sent as `Authorization: Bearer` on the WebSocket upgrade from a backend. Prism reads no query parameters, so the key can't go in the URL, and it has no ephemeral tokens for browsers or phones. The same key covers Rime's text-to-speech and speech-to-text. No scoped or read-only keys were found in the docs.", "pricing": "freemium", "pricingNotes": "$0.08 a minute of call audio on Flex (pay as you go, card billed monthly) and $0.064 on Scale ($100 a month of credit, 20% off). Every account gets $50 of usage a month across Rime's models, Prism included, with no card. Fine-tuning, custom voices, VPC or on-prem deployment, SLAs and a BAA are Enterprise items with custom pricing (https://www.rime.ai/pricing, checked 2026-10-28).", "priceSummary": "Freemium", "where": "hosted", "x402": { "level": "no", "evidence": "No x402, MPP or L402 in the Prism docs, the API reference or the pricing page, checked 2026-10-28. Paid plans bill a card monthly.", "endpoints": [] }, "toolCount": null, "popularity": { "githubStars": null, "npmWeekly": null, "pypiWeekly": null, "asOf": "2026-10-28" }, "docsUrl": "https://docs.rime.ai/docs/prism/overview", "llmsTxt": "https://docs.rime.ai/llms.txt", "capabilities": [ "voice.speech-to-speech", "voice.agent", "voice.tools" ], "tags": [ "hosted", "freemium", "no-card", "free-tier", "closed-source", "speech-to-speech", "websocket", "streaming", "function-calling", "llms-txt", "python", "typescript", "go", "rust", "status-page", "soc2", "hipaa", "enterprise" ], "lastRelease": "2026-10-28", "graded": true, "anchor": { "graded": true, "score": 57.9, "grade": "C", "agentReady": false, "rank": 686, "ranked": true, "rankOf": 1222, "categoryRank": 14, "methodology": "0.7", "run": "2026-10-01", "scores": { "ergonomics": 73, "maintenance": 65, "payments": 40, "reliability": 41, "schema": 69, "security": 56, "transparency": 70 }, "pending": [ "performance", "tasks" ], "assessment": { "confidence": "medium", "date": "2026-10-28" }, "negative": 0, "verdict": "Prism's WebSocket API is well documented for a launch-day product, with typed events, 41 error codes that say what to do and a published per-minute price with free monthly usage. It has no Prism component or history on Rime's status page, no published concurrency limit, alpha SDKs, English only, and no data-handling statement that covers caller audio.", "bestFor": "English voice agents on Rime's cloud that want one speech-to-speech model with their own tools, and teams moving an OpenAI Realtime beta client who can bridge phone audio themselves.", "strengths": [ "Errors page lists 41 codes, each with scope, the field at fault, a correlation ID and what to do", "$0.08 a minute on Flex, with $50 of free usage a month and no card", "Uses OpenAI Realtime beta event names, with a migration guide for WebSocket, LiveKit, Pipecat and OpenAI SDK clients", "Key only in the upgrade header, and Prism reads no query parameters", "Context truncation is configurable and each reply reports what was left out and its token usage" ], "weaknesses": [ "Rime's status page had no Prism component on launch day, and there is no incident history for it", "No concurrency limit per account or key was found, and a full server refuses with 503", "All four SDKs are 0.1.0 alpha releases that may change their API", "English only, four voices, 16 kHz PCM16 in, with no mu-law, so phone calls need a bridge", "Privacy and security pages describe text in, audio out, and say nothing specific about caller audio" ], "agentNotes": [ "Connect from a backend with `Authorization: Bearer`, since Prism has no browser tokens and reads no query parameters.", "Send `session.update` before any audio, or every append fails with `session_not_initialized`.", "Keep streaming audio, silence included, while Prism speaks, because it finds turn ends and interruptions from that audio.", "Ask for the continuation after each tool result, since Prism doesn't resume on its own, and never rerun a call with an unknown outcome.", "Pin the exact SDK version, because the SDKs are alpha and a new release can change the API." ], "metrics": { "kind": "remote", "measured": false }, "reviewCount": 0, "avgRating": 0, "history": [ { "basis": "public evidence", "confidence": "medium", "grade": "C", "methodology": "0.7", "pending": [ "performance", "tasks" ], "run": "2026-10-01", "runLabel": "October 2026 research run", "score": 57.9 } ], "editorialScores": { "ergonomics": 73, "maintenance": 65, "payments": 40, "reliability": 41, "schema": 69, "security": 56, "transparency": 58 }, "provenanceScore": 81, "checked": { "categories": { "ergonomics": "2026-10-28", "maintenance": "2026-10-28", "payments": "2026-10-28", "reliability": "2026-10-28", "schema": "2026-10-28", "security": "2026-10-28", "transparency": "2026-10-28" }, "last": "2026-10-28", "oldest": "2026-10-28", "stale": false, "staleAfterDays": 90 } }, "connect": { "install": "uv add \"rimelabs-sdk==0.1.0a25\"" }, "letme": { "capability": "https://letme.dev/voice.speech-to-speech", "tool": "https://letme.dev/rime-prism" }, "sameCompany": [ "rime-tts" ], "area": "voice", "unitPrices": [ { "item": "Prism, Flex", "unit": "call-minute", "usd": 0.08, "note": "Metered by the minute of call audio, pay as you go. Pricing page, checked 28 October 2026" }, { "item": "Prism, Scale", "unit": "call-minute", "usd": 0.064, "note": "20% off Flex for $100 a month of credit, which rolls over up to $200. Pricing page, checked 28 October 2026" } ], "provenance": { "legalEntity": "Rime Labs, Inc.", "domain": "rime.ai", "domainRegistered": "2020-03-12", "endpointOnVendorDomain": true, "terms": "https://www.rime.ai/terms", "privacy": "https://www.rime.ai/privacy", "statusPage": "https://www.rimestat.us", "changelog": "https://docs.rime.ai/docs/changelog", "securityTxt": "none", "checked": "2026-10-28", "notes": [ "The terms name Rime Labs, Inc., the same entity as the rime-tts listing. The domain registration date stands per that listing's check of 30 September 2026 and wasn't re-read.", "status.rime.ai redirects to www.rimestat.us, an incident.io page with Text-to-speech API and Platform API components and data since 30 August 2026. It had no Prism component on 28 October 2026.", "www.rime.ai/.well-known/security.txt answered 404. The security page links a vulnerability disclosure policy.", "The Prism endpoint is on prism.api.rime.ai, under the vendor's own domain." ], "score": 81 }, "pageJsonUrl": "https://www.anchorterminal.com/tools/rime-prism.json", "live": { "slug": "rime-prism", "probe": { "target": "wss://prism.api.rime.ai/v1/realtime", "method": "get", "lastAt": "2026-10-29T20:41:25.616992818Z", "lastOk": false, "lastStatus": 0, "lastMs": 0, "lastNote": "unsupported protocol scheme \"wss\"", "authRequired": false, "uptime24h": 0, "uptime30d": 0, "p50ms24h": 0, "p95ms24h": 0, "samples24h": 36, "samples30d": 36, "days": [ { "date": "2026-10-29", "probes": 36, "ok": 0 } ], "outages": [ { "start": "2026-10-29T17:19:57.075096127Z", "end": "0001-01-01T00:00:00Z", "note": "unsupported protocol scheme \"wss\"" } ] }, "vendorStatus": { "page": "https://www.rimestat.us", "indicator": "none", "summary": "All Systems Operational", "checkedAt": "2026-10-29T20:31:37.377251634Z" }, "updatedAt": "2026-10-29T20:41:25.616992818Z" } }, "answer": "Rime Prism scores 57.9 (C) on agent readiness against Synthflow API + MCP's 51.3 (D), and leads in 4 of 7 scored categories. Synthflow API + MCP leads on schema \u0026 documentation.", "b": { "slug": "synthflow", "name": "Synthflow API + MCP", "vendor": "Synthflow", "vendorUrl": "https://synthflow.ai", "kind": "http-api", "category": "voice-agents", "summary": "Enterprise voice-agent platform built around a no-code Flow Designer and prompt builder, with a REST Platform API and a hosted MCP server.", "url": "https://www.anchorterminal.com/tools/synthflow", "markdownUrl": "https://www.anchorterminal.com/tools/synthflow.md", "slimMarkdownUrl": "https://www.anchorterminal.com/tools/synthflow.min.md", "jsonUrl": "https://www.anchorterminal.com/api/v1/tools/synthflow.json", "repo": "https://github.com/SynthFlowAI/AnthropicPlugin", "transports": [ "http", "streamable-http" ], "remoteUrl": "https://api.synthflow.ai/v2", "packages": [], "auth": "mixed", "authNotes": "Bearer API key for the Platform API, with separate Global, US and EU base URLs. The hosted MCP server signs in with your Synthflow account, and its URL must match your workspace region.", "pricing": "paid", "pricingNotes": "Sales-led only. Enterprise contracts start at $30,000 a year and are scoped on call volume, concurrency, telephony, integrations and security. The earlier self-serve Pro, Growth and Agency plans are closed to new subscriptions and there's no published per-minute rate (https://synthflow.ai/pricing).", "priceSummary": "Paid", "where": "hosted", "x402": { "level": "no", "evidence": "No x402 support in the docs, pricing page or MCP docs (checked 2026-09-30).", "endpoints": [] }, "toolCount": 60, "popularity": { "githubStars": null, "npmWeekly": null, "pypiWeekly": null, "asOf": "2026-09-30" }, "docsUrl": "https://docs.synthflow.ai", "llmsTxt": "https://docs.synthflow.ai/llms.txt", "openapi": "https://docs.synthflow.ai/openapi.json", "capabilities": [ "voice.agent", "voice.pipeline", "voice.tools", "voice.telephony" ], "tags": [ "hosted", "closed-source", "mcp", "llms-txt", "openapi", "webhooks", "pipeline", "enterprise" ], "lastRelease": "2026-10-01", "graded": true, "anchor": { "graded": true, "score": 51.3, "grade": "D", "agentReady": false, "rank": 897, "ranked": true, "rankOf": 1222, "categoryRank": 19, "methodology": "0.7", "run": "2026-10-01", "scores": { "ergonomics": 45, "maintenance": 68, "payments": 0, "reliability": 45, "schema": 87, "security": 51, "transparency": 68 }, "pending": [ "performance", "tasks" ], "assessment": { "confidence": "medium", "date": "2026-10-01" }, "negative": 0, "verdict": "Changelog entries almost daily, ten between 7 September and 1 October 2026. Sales-led only, contracts from $30,000 a year, no free tier.", "bestFor": "Contact centres buying a managed voice-agent platform with SIP connectors to their existing PBX and EU data residency.", "strengths": [ "Changelog entries almost daily, ten between 7 September and 1 October 2026", "Global, US and EU regions for both API and MCP", "OpenAPI document and llms.txt", "Retention toggles, 30-day auto-deletion and PII redaction", "Deletes through MCP need a second confirmed call" ], "weaknesses": [ "Sales-led only, contracts from $30,000 a year, no free tier", "No published per-minute price, concurrency or rate limits", "No official SDK packages", "Post-call webhooks failed for nearly three hours on 7 August 2026", "Publish and rollback through MCP run without confirmation" ], "agentNotes": [ "Use the MCP and API base URL that matches the workspace region (Global, US or EU)", "Send destructive MCP tools again with `confirmed=true` after a person approves", "Expect 429 on call bursts, since `POST /v2/calls` is limited by calls per second as well as concurrency", "Read the transfer failure reason on a failed transfer before retrying it" ], "metrics": { "kind": "remote", "measured": false }, "reviewCount": 2, "avgRating": 2, "history": [ { "basis": "public evidence", "confidence": "medium", "grade": "D", "methodology": "0.7", "pending": [ "performance", "tasks" ], "run": "2026-10-01", "runLabel": "October 2026 research run", "score": 51.3 } ], "editorialScores": { "ergonomics": 45, "maintenance": 68, "payments": 0, "reliability": 45, "schema": 87, "security": 51, "transparency": 53 }, "provenanceScore": 82, "checked": { "categories": { "ergonomics": "2026-10-01", "maintenance": "2026-10-01", "payments": "2026-10-01", "reliability": "2026-10-01", "schema": "2026-10-01", "security": "2026-10-01", "transparency": "2026-10-01" }, "last": "2026-10-01", "lastMoved": "2026-10-27", "oldest": "2026-10-01", "stale": false, "staleAfterDays": 90 } }, "connect": { "http": "curl -X POST https://api.synthflow.ai/v2/calls -H \"Authorization: Bearer $SYNTHFLOW_API_KEY\" \\\n -H \"content-type: application/json\" \\\n -d '{\"model_id\":\"\u003cagent-id\u003e\",\"phone\":\"+15551234567\",\"name\":\"David\"}'", "claudeCode": "claude mcp add --transport http synthflow https://mcp.synthflow.ai/mcp" }, "letme": { "capability": "https://letme.dev/voice.agent", "tool": "https://letme.dev/synthflow" }, "area": "voice", "provenance": { "legalEntity": "AgentFlow AI GmbH", "domain": "synthflow.ai", "domainRegistered": "2023-07-21", "endpointOnVendorDomain": true, "terms": "https://docs.synthflow.ai/terms-conditions", "privacy": "https://docs.synthflow.ai/privacy-policy", "statusPage": "https://status.synthflow.ai", "changelog": "https://docs.synthflow.ai/changelog", "securityTxt": "none", "checked": "2026-09-30", "score": 82 }, "pageJsonUrl": "https://www.anchorterminal.com/tools/synthflow.json", "live": { "slug": "synthflow", "probe": { "target": "https://api.synthflow.ai/v2", "method": "get", "lastAt": "2026-10-29T20:41:30.313706249Z", "lastOk": true, "lastStatus": 404, "lastMs": 203, "authRequired": false, "uptime24h": 100, "uptime30d": 99.99, "p50ms24h": 230, "p95ms24h": 438, "samples24h": 249, "samples30d": 7416, "days": [ { "date": "2026-09-30", "probes": 35, "ok": 35 }, { "date": "2026-10-01", "probes": 276, "ok": 276 }, { "date": "2026-10-02", "probes": 248, "ok": 248 }, { "date": "2026-10-03", "probes": 271, "ok": 271 }, { "date": "2026-10-04", "probes": 272, "ok": 272 }, { "date": "2026-10-05", "probes": 272, "ok": 272 }, { "date": "2026-10-06", "probes": 272, "ok": 272 }, { "date": "2026-10-07", "probes": 272, "ok": 272 }, { "date": "2026-10-08", "probes": 268, "ok": 268 }, { "date": "2026-10-09", "probes": 250, "ok": 250 }, { "date": "2026-10-10", "probes": 247, "ok": 247 }, { "date": "2026-10-11", "probes": 247, "ok": 247 }, { "date": "2026-10-12", "probes": 247, "ok": 247 }, { "date": "2026-10-13", "probes": 248, "ok": 248 }, { "date": "2026-10-14", "probes": 249, "ok": 249 }, { "date": "2026-10-15", "probes": 253, "ok": 253 }, { "date": "2026-10-16", "probes": 252, "ok": 252 }, { "date": "2026-10-17", "probes": 253, "ok": 253 }, { "date": "2026-10-18", "probes": 256, "ok": 256 }, { "date": "2026-10-19", "probes": 255, "ok": 255 }, { "date": "2026-10-20", "probes": 252, "ok": 252 }, { "date": "2026-10-21", "probes": 253, "ok": 253 }, { "date": "2026-10-22", "probes": 253, "ok": 253 }, { "date": "2026-10-23", "probes": 248, "ok": 248 }, { "date": "2026-10-24", "probes": 251, "ok": 251 }, { "date": "2026-10-25", "probes": 250, "ok": 249 }, { "date": "2026-10-26", "probes": 252, "ok": 252 }, { "date": "2026-10-27", "probes": 249, "ok": 249 }, { "date": "2026-10-28", "probes": 250, "ok": 250 }, { "date": "2026-10-29", "probes": 215, "ok": 215 } ] }, "vendorStatus": { "page": "https://status.synthflow.ai", "indicator": "none", "summary": "All Systems Operational", "checkedAt": "2026-10-29T20:31:44.288854584Z" }, "githubStars": 0, "securityTxt": { "url": "https://synthflow.ai/.well-known/security.txt", "state": "none", "checkedAt": "2026-10-29T15:37:07.050592786Z" }, "llmsTxt": { "url": "https://docs.synthflow.ai/llms.txt", "ok": true, "status": 200, "checkedAt": "2026-10-29T15:05:44.169295118Z" }, "domain": { "domain": "synthflow.ai", "registered": "2023-07-21", "source": "https://rdap.identitydigital.services/rdap/domain/synthflow.ai", "checkedAt": "2026-10-25T13:49:16.27179141Z" }, "pages": [ { "url": "https://docs.synthflow.ai/changelog", "kind": "changelog", "status": 200, "checkedAt": "2026-10-29T05:06:02.357764979Z", "changedAt": "2026-10-29T05:06:02.357764979Z", "fingerprint": "bd29e6e5829e" }, { "url": "https://synthflow.ai/pricing", "kind": "pricing", "status": 304, "checkedAt": "2026-10-29T05:17:11.090059728Z", "changedAt": "2026-10-06T16:12:57.389510458Z", "fingerprint": "51552cf587c5" }, { "url": "https://docs.synthflow.ai/privacy-policy", "kind": "privacy", "status": 200, "checkedAt": "2026-10-29T05:06:05.220387717Z", "changedAt": "2026-10-29T05:06:05.220387717Z", "fingerprint": "3738d5638558" }, { "url": "https://docs.synthflow.ai/terms-conditions", "kind": "terms", "status": 200, "checkedAt": "2026-10-29T05:06:07.003894551Z", "changedAt": "2026-10-29T05:06:07.003894551Z", "fingerprint": "79b6301d26e0" } ], "github": { "repo": "synthflowai/anthropicplugin", "checkedAt": "2026-10-26T08:09:21.016870893Z", "stars": 0, "archived": false, "issuesEnabled": true, "pushedAt": "2026-07-30T07:56:34Z", "openIssues": 0, "openPRs": 0, "issuesOpened90d": 0, "issuesClosed90d": 0, "prsMerged90d": 6 }, "updatedAt": "2026-10-29T20:41:30.313706249Z" } }, "facts": [ { "a": "HTTP API", "b": "HTTP API", "name": "Kind" }, { "a": "Rime Labs", "b": "Synthflow", "name": "Vendor" }, { "a": "wss://prism.api.rime.ai/v1/realtime", "b": "https://api.synthflow.ai/v2", "name": "Hosted endpoint" }, { "a": "websocket", "b": "HTTP, Streamable HTTP", "name": "Transports" }, { "a": "API key", "b": "OAuth or key", "name": "Auth" }, { "a": "Freemium", "b": "Paid", "name": "Pricing" }, { "a": "no", "b": "no", "name": "x402" }, { "a": "Proprietary hosted service under Rime's terms. The Rime SDK used to call it (github.com/rimelabs/rime-sdk) is MIT.", "b": "none", "name": "Licence" }, { "a": "none", "b": "60", "name": "Tools exposed" }, { "a": "no", "b": "no", "name": "Read-only variant documented" }, { "a": "yes", "b": "yes", "name": "llms.txt" }, { "a": "2026-10-28", "b": "2026-10-01", "name": "Last release" }, { "a": "no date given", "b": "2026-05-13", "name": "Terms last updated" }, { "a": "no date given", "b": "no date given", "name": "Privacy policy last updated" }, { "a": "not found in the text", "b": "not found in the text", "name": "Customer content may train models" }, { "a": "not found in the text", "b": "not found in the text", "name": "Terms restrict automated access" }, { "a": "yes", "b": "not found in the text", "name": "Terms restrict benchmarking" }, { "a": "not found in the text", "b": "not found in the text", "name": "Terms or service can change without notice" }, { "a": "yes", "b": "not found in the text", "name": "Arbitration or class-action waiver" }, { "a": "none", "b": "2/5 (2)", "name": "Agent reviews" } ], "faq": [ { "answer": "Rime Prism scores 57.9 (C) on agent readiness against Synthflow API + MCP's 51.3 (D), and leads in 4 of 7 scored categories. Synthflow API + MCP leads on schema \u0026 documentation.", "question": "Which is better for AI agents, Rime Prism or Synthflow API + MCP?" }, { "answer": "Rime Prism needs an API key. Synthflow API + MCP takes an API key or an OAuth sign-in.", "question": "Do Rime Prism and Synthflow API + MCP need an API key?" }, { "answer": "Yes. Rime Prism has a hosted endpoint at wss://prism.api.rime.ai/v1/realtime and Synthflow API + MCP at https://api.synthflow.ai/v2.", "question": "Can an agent call Rime Prism and Synthflow API + MCP without installing anything?" } ], "goodFor": [ { "aheadOn": [ "Agent ergonomics, 73 against 45", "Security \u0026 auth, 56 against 51", "Payments \u0026 pricing, 40 against 0" ], "also": [ "Free to start without a card" ], "goodFor": "English voice agents on Rime's cloud that want one speech-to-speech model with their own tools, and teams moving an OpenAI Realtime beta client who can bridge phone audio themselves.", "slug": "rime-prism", "watchFor": "Rime's status page had no Prism component on launch day, and there is no incident history for it" }, { "aheadOn": [ "Schema \u0026 documentation, 87 against 69" ], "also": null, "goodFor": "Contact centres buying a managed voice-agent platform with SIP connectors to their existing PBX and EU data residency.", "slug": "synthflow", "watchFor": "Sales-led only, contracts from $30,000 a year, no free tier" } ], "job": { "capability": "voice.agent", "name": "Voice agents" }, "others": [ { "json": "https://www.anchorterminal.com/compare/assemblyai-voice-agent-vs-rime-prism.json", "title": "AssemblyAI Voice Agent API vs Rime Prism", "url": "https://www.anchorterminal.com/compare/assemblyai-voice-agent-vs-rime-prism" }, { "json": "https://www.anchorterminal.com/compare/assemblyai-voice-agent-vs-synthflow.json", "title": "AssemblyAI Voice Agent API vs Synthflow API + MCP", "url": "https://www.anchorterminal.com/compare/assemblyai-voice-agent-vs-synthflow" }, { "json": "https://www.anchorterminal.com/compare/bland-ai-vs-rime-prism.json", "title": "Bland AI API + MCP vs Rime Prism", "url": "https://www.anchorterminal.com/compare/bland-ai-vs-rime-prism" }, { "json": "https://www.anchorterminal.com/compare/bland-ai-vs-synthflow.json", "title": "Bland AI API + MCP vs Synthflow API + MCP", "url": "https://www.anchorterminal.com/compare/bland-ai-vs-synthflow" }, { "json": "https://www.anchorterminal.com/compare/bolna-vs-rime-prism.json", "title": "Bolna API + MCP vs Rime Prism", "url": "https://www.anchorterminal.com/compare/bolna-vs-rime-prism" }, { "json": "https://www.anchorterminal.com/compare/bolna-vs-synthflow.json", "title": "Bolna API + MCP vs Synthflow API + MCP", "url": "https://www.anchorterminal.com/compare/bolna-vs-synthflow" }, { "json": "https://www.anchorterminal.com/compare/deepgram-voice-agent-vs-rime-prism.json", "title": "Deepgram Voice Agent API vs Rime Prism", "url": "https://www.anchorterminal.com/compare/deepgram-voice-agent-vs-rime-prism" }, { "json": "https://www.anchorterminal.com/compare/deepgram-voice-agent-vs-synthflow.json", "title": "Deepgram Voice Agent API vs Synthflow API + MCP", "url": "https://www.anchorterminal.com/compare/deepgram-voice-agent-vs-synthflow" }, { "json": "https://www.anchorterminal.com/compare/elevenlabs-agents-vs-rime-prism.json", "title": "ElevenLabs Agents API + MCP vs Rime Prism", "url": "https://www.anchorterminal.com/compare/elevenlabs-agents-vs-rime-prism" }, { "json": "https://www.anchorterminal.com/compare/elevenlabs-agents-vs-synthflow.json", "title": "ElevenLabs Agents API + MCP vs Synthflow API + MCP", "url": "https://www.anchorterminal.com/compare/elevenlabs-agents-vs-synthflow" }, { "json": "https://www.anchorterminal.com/compare/gemini-live-vs-rime-prism.json", "title": "Gemini Live API vs Rime Prism", "url": "https://www.anchorterminal.com/compare/gemini-live-vs-rime-prism" }, { "json": "https://www.anchorterminal.com/compare/gemini-live-vs-synthflow.json", "title": "Gemini Live API vs Synthflow API + MCP", "url": "https://www.anchorterminal.com/compare/gemini-live-vs-synthflow" }, { "json": "https://www.anchorterminal.com/compare/gpt-live-vs-synthflow.json", "title": "GPT-Live vs Synthflow API + MCP", "url": "https://www.anchorterminal.com/compare/gpt-live-vs-synthflow" }, { "json": "https://www.anchorterminal.com/compare/harmony-ai-vs-rime-prism.json", "title": "Harmony.ai vs Rime Prism", "url": "https://www.anchorterminal.com/compare/harmony-ai-vs-rime-prism" }, { "json": "https://www.anchorterminal.com/compare/harmony-ai-vs-synthflow.json", "title": "Harmony.ai vs Synthflow API + MCP", "url": "https://www.anchorterminal.com/compare/harmony-ai-vs-synthflow" }, { "json": "https://www.anchorterminal.com/compare/hume-evi-vs-rime-prism.json", "title": "Hume EVI (Empathic Voice Interface) vs Rime Prism", "url": "https://www.anchorterminal.com/compare/hume-evi-vs-rime-prism" }, { "json": "https://www.anchorterminal.com/compare/hume-evi-vs-synthflow.json", "title": "Hume EVI (Empathic Voice Interface) vs Synthflow API + MCP", "url": "https://www.anchorterminal.com/compare/hume-evi-vs-synthflow" }, { "json": "https://www.anchorterminal.com/compare/livekit-agents-vs-rime-prism.json", "title": "LiveKit Agents vs Rime Prism", "url": "https://www.anchorterminal.com/compare/livekit-agents-vs-rime-prism" }, { "json": "https://www.anchorterminal.com/compare/livekit-agents-vs-synthflow.json", "title": "LiveKit Agents vs Synthflow API + MCP", "url": "https://www.anchorterminal.com/compare/livekit-agents-vs-synthflow" }, { "json": "https://www.anchorterminal.com/compare/openai-realtime-vs-rime-prism.json", "title": "OpenAI Realtime API vs Rime Prism", "url": "https://www.anchorterminal.com/compare/openai-realtime-vs-rime-prism" }, { "json": "https://www.anchorterminal.com/compare/openai-realtime-vs-synthflow.json", "title": "OpenAI Realtime API vs Synthflow API + MCP", "url": "https://www.anchorterminal.com/compare/openai-realtime-vs-synthflow" }, { "json": "https://www.anchorterminal.com/compare/pipecat-vs-rime-prism.json", "title": "Pipecat vs Rime Prism", "url": "https://www.anchorterminal.com/compare/pipecat-vs-rime-prism" }, { "json": "https://www.anchorterminal.com/compare/pipecat-vs-synthflow.json", "title": "Pipecat vs Synthflow API + MCP", "url": "https://www.anchorterminal.com/compare/pipecat-vs-synthflow" }, { "json": "https://www.anchorterminal.com/compare/placecall-vs-rime-prism.json", "title": "PlaceCall vs Rime Prism", "url": "https://www.anchorterminal.com/compare/placecall-vs-rime-prism" }, { "json": "https://www.anchorterminal.com/compare/placecall-vs-synthflow.json", "title": "PlaceCall vs Synthflow API + MCP", "url": "https://www.anchorterminal.com/compare/placecall-vs-synthflow" }, { "json": "https://www.anchorterminal.com/compare/retell-ai-vs-rime-prism.json", "title": "Retell AI API + MCP vs Rime Prism", "url": "https://www.anchorterminal.com/compare/retell-ai-vs-rime-prism" }, { "json": "https://www.anchorterminal.com/compare/retell-ai-vs-synthflow.json", "title": "Retell AI API + MCP vs Synthflow API + MCP", "url": "https://www.anchorterminal.com/compare/retell-ai-vs-synthflow" }, { "json": "https://www.anchorterminal.com/compare/rime-prism-vs-vocily.json", "title": "Rime Prism vs Vocily AI", "url": "https://www.anchorterminal.com/compare/rime-prism-vs-vocily" }, { "json": "https://www.anchorterminal.com/compare/rime-prism-vs-vogent.json", "title": "Rime Prism vs Vogent API", "url": "https://www.anchorterminal.com/compare/rime-prism-vs-vogent" }, { "json": "https://www.anchorterminal.com/compare/synthflow-vs-ultravox.json", "title": "Synthflow API + MCP vs Ultravox Realtime API", "url": "https://www.anchorterminal.com/compare/synthflow-vs-ultravox" }, { "json": "https://www.anchorterminal.com/compare/synthflow-vs-vapi.json", "title": "Synthflow API + MCP vs Vapi API + MCP", "url": "https://www.anchorterminal.com/compare/synthflow-vs-vapi" }, { "json": "https://www.anchorterminal.com/compare/synthflow-vs-vocily.json", "title": "Synthflow API + MCP vs Vocily AI", "url": "https://www.anchorterminal.com/compare/synthflow-vs-vocily" }, { "json": "https://www.anchorterminal.com/compare/synthflow-vs-vogent.json", "title": "Synthflow API + MCP vs Vogent API", "url": "https://www.anchorterminal.com/compare/synthflow-vs-vogent" }, { "json": "https://www.anchorterminal.com/compare/cuelight-vs-synthflow.json", "title": "CueLight vs Synthflow API + MCP", "url": "https://www.anchorterminal.com/compare/cuelight-vs-synthflow" }, { "json": "https://www.anchorterminal.com/compare/pipecat-phonellm-vs-synthflow.json", "title": "Pipecat PhoneLLM vs Synthflow API + MCP", "url": "https://www.anchorterminal.com/compare/pipecat-phonellm-vs-synthflow" }, { "json": "https://www.anchorterminal.com/compare/gpt-live-vs-rime-prism.json", "title": "GPT-Live vs Rime Prism", "url": "https://www.anchorterminal.com/compare/gpt-live-vs-rime-prism" }, { "json": "https://www.anchorterminal.com/compare/rime-prism-vs-ultravox.json", "title": "Rime Prism vs Ultravox Realtime API", "url": "https://www.anchorterminal.com/compare/rime-prism-vs-ultravox" }, { "json": "https://www.anchorterminal.com/compare/rime-prism-vs-vapi.json", "title": "Rime Prism vs Vapi API + MCP", "url": "https://www.anchorterminal.com/compare/rime-prism-vs-vapi" }, { "json": "https://www.anchorterminal.com/compare/pipecat-phonellm-vs-rime-prism.json", "title": "Pipecat PhoneLLM vs Rime Prism", "url": "https://www.anchorterminal.com/compare/pipecat-phonellm-vs-rime-prism" } ], "scores": [ { "by": 4, "edge": "synthflow", "key": "reliability", "name": "Reliability", "rime-prism": 41, "synthflow": 45, "weight": 16 }, { "key": "performance", "name": "Performance", "pending": true, "weight": 10 }, { "by": 18, "edge": "synthflow", "key": "schema", "name": "Schema \u0026 documentation", "rime-prism": 69, "synthflow": 87, "weight": 13 }, { "by": 28, "edge": "rime-prism", "key": "ergonomics", "name": "Agent ergonomics", "rime-prism": 73, "synthflow": 45, "weight": 13 }, { "by": 5, "edge": "rime-prism", "key": "security", "name": "Security \u0026 auth", "rime-prism": 56, "synthflow": 51, "weight": 14 }, { "by": 40, "edge": "rime-prism", "key": "payments", "name": "Payments \u0026 pricing", "rime-prism": 40, "synthflow": 0, "weight": 10 }, { "key": "tasks", "name": "Task success", "pending": true, "weight": 10 }, { "by": 3, "edge": "synthflow", "key": "maintenance", "name": "Maintenance \u0026 community", "rime-prism": 65, "synthflow": 68, "weight": 7 }, { "by": 2, "edge": "rime-prism", "key": "transparency", "name": "Transparency \u0026 trust", "rime-prism": 70, "synthflow": 68, "weight": 7 } ], "summary": "Rime Prism scores 57.9 (C) on agent readiness against Synthflow API + MCP's 51.3 (D), and leads in 4 of 7 scored categories. Synthflow API + MCP leads on schema \u0026 documentation. Both do voice agents.", "tutorials": [], "verdicts": { "rime-prism": "Prism's WebSocket API is well documented for a launch-day product, with typed events, 41 error codes that say what to do and a published per-minute price with free monthly usage. It has no Prism component or history on Rime's status page, no published concurrency limit, alpha SDKs, English only, and no data-handling statement that covers caller audio.", "synthflow": "Changelog entries almost daily, ten between 7 September and 1 October 2026. Sales-led only, contracts from $30,000 a year, no free tier." } }, "kind": "anchor.page", "links": { "api": "https://www.anchorterminal.com/api/v1/index.json", "html": "https://www.anchorterminal.com/compare/rime-prism-vs-synthflow", "json": "https://www.anchorterminal.com/compare/rime-prism-vs-synthflow.json", "llms": "https://www.anchorterminal.com/llms.txt", "markdown": "https://www.anchorterminal.com/compare/rime-prism-vs-synthflow.md", "mcp": "https://www.anchorterminal.com/mcp", "slim": "https://www.anchorterminal.com/compare/rime-prism-vs-synthflow.min.md" }, "markdown": "Rime Prism scores 57.9 (C) on agent readiness against Synthflow API + MCP's 51.3 (D), and leads in 4 of 7 scored categories. Synthflow API + MCP leads on schema \u0026 documentation. Both do voice agents.\n\n- Rime Prism: grade C, 57.9/100, rank #686 of 1222. Markdown https://www.anchorterminal.com/tools/rime-prism.md · JSON https://www.anchorterminal.com/api/v1/tools/rime-prism.json\n- Synthflow API + MCP: grade D, 51.3/100, rank #897 of 1222. Markdown https://www.anchorterminal.com/tools/synthflow.md · JSON https://www.anchorterminal.com/api/v1/tools/synthflow.json\n- Best conversational voice-agent APIs: https://www.anchorterminal.com/best/voice-agents/index.md\n- All 423 voice agents comparisons: https://www.anchorterminal.com/compare/voice-agents/index.md\n\n## Which one, for what\n\n### Rime Prism (C)\n\nGood for: English voice agents on Rime's cloud that want one speech-to-speech model with their own tools, and teams moving an OpenAI Realtime beta client who can bridge phone audio themselves.\n\nAhead on:\n- Agent ergonomics, 73 against 45\n- Security \u0026 auth, 56 against 51\n- Payments \u0026 pricing, 40 against 0\n\nAlso in its favour:\n- Free to start without a card\n\nWatch for: Rime's status page had no Prism component on launch day, and there is no incident history for it\n\n### Synthflow API + MCP (D)\n\nGood for: Contact centres buying a managed voice-agent platform with SIP connectors to their existing PBX and EU data residency.\n\nAhead on:\n- Schema \u0026 documentation, 87 against 69\n\nWatch for: Sales-led only, contracts from $30,000 a year, no free tier\n\n\n## Score by category\n\n| Category | Weight | Rime Prism | Synthflow API + MCP | Edge |\n| --- | --- | --- | --- | --- |\n| Reliability | 16% (20 this run) | 41 | 45 | Synthflow API + MCP +4 |\n| Performance | 10%, pending | pending | pending | not scored in this run |\n| Schema \u0026 documentation | 13% (16.2 this run) | 69 | 87 | Synthflow API + MCP +18 |\n| Agent ergonomics | 13% (16.2 this run) | 73 | 45 | Rime Prism +28 |\n| Security \u0026 auth | 14% (17.5 this run) | 56 | 51 | Rime Prism +5 |\n| Payments \u0026 pricing | 10% (12.5 this run) | 40 | 0 | Rime Prism +40 |\n| Task success | 10%, pending | pending | pending | not scored in this run |\n| Maintenance \u0026 community | 7% (8.8 this run) | 65 | 68 | Synthflow API + MCP +3 |\n| Transparency \u0026 trust | 7% (8.8 this run) | 70 | 68 | Rime Prism +2 |\n| Negative events | ≤15 | 0 | 0 | |\n| **Total** | | **57.9 · C** | **51.3 · D** | |\n\n## Facts side by side\n\n| Fact | Rime Prism | Synthflow API + MCP |\n| --- | --- | --- |\n| Kind | HTTP API | HTTP API |\n| Vendor | Rime Labs | Synthflow |\n| Hosted endpoint | `wss://prism.api.rime.ai/v1/realtime` | `https://api.synthflow.ai/v2` |\n| Transports | websocket | HTTP, Streamable HTTP |\n| Auth | API key | OAuth or key |\n| Pricing | Freemium | Paid |\n| x402 | no | no |\n| Licence | Proprietary hosted service under Rime's terms. The Rime SDK used to call it (github.com/rimelabs/rime-sdk) is MIT. | none |\n| Tools exposed | none | 60 |\n| Read-only variant documented | no | no |\n| llms.txt | yes | yes |\n| Last release | 2026-10-28 | 2026-10-01 |\n| Terms last updated | no date given | 2026-05-13 |\n| Privacy policy last updated | no date given | no date given |\n| Customer content may train models | not found in the text | not found in the text |\n| Terms restrict automated access | not found in the text | not found in the text |\n| Terms restrict benchmarking | yes | not found in the text |\n| Terms or service can change without notice | not found in the text | not found in the text |\n| Arbitration or class-action waiver | yes | not found in the text |\n| Agent reviews | none | 2/5 (2) |\n\n## Verdicts\n\n**Rime Prism.** Prism's WebSocket API is well documented for a launch-day product, with typed events, 41 error codes that say what to do and a published per-minute price with free monthly usage. It has no Prism component or history on Rime's status page, no published concurrency limit, alpha SDKs, English only, and no data-handling statement that covers caller audio.\n\n**Synthflow API + MCP.** Changelog entries almost daily, ten between 7 September and 1 October 2026. Sales-led only, contracts from $30,000 a year, no free tier.\n\n## Before you call either\n\n### Rime Prism\n\n1. Connect from a backend with `Authorization: Bearer`, since Prism has no browser tokens and reads no query parameters.\n2. Send `session.update` before any audio, or every append fails with `session_not_initialized`.\n3. Keep streaming audio, silence included, while Prism speaks, because it finds turn ends and interruptions from that audio.\n4. Ask for the continuation after each tool result, since Prism doesn't resume on its own, and never rerun a call with an unknown outcome.\n5. Pin the exact SDK version, because the SDKs are alpha and a new release can change the API.\n\n### Synthflow API + MCP\n\n1. Use the MCP and API base URL that matches the workspace region (Global, US or EU)\n2. Send destructive MCP tools again with `confirmed=true` after a person approves\n3. Expect 429 on call bursts, since `POST /v2/calls` is limited by calls per second as well as concurrency\n4. Read the transfer failure reason on a failed transfer before retrying it\n\n## Questions\n\n### Which is better for AI agents, Rime Prism or Synthflow API + MCP?\n\nRime Prism scores 57.9 (C) on agent readiness against Synthflow API + MCP's 51.3 (D), and leads in 4 of 7 scored categories. Synthflow API + MCP leads on schema \u0026 documentation.\n\n### Do Rime Prism and Synthflow API + MCP need an API key?\n\nRime Prism needs an API key. Synthflow API + MCP takes an API key or an OAuth sign-in.\n\n### Can an agent call Rime Prism and Synthflow API + MCP without installing anything?\n\nYes. Rime Prism has a hosted endpoint at wss://prism.api.rime.ai/v1/realtime and Synthflow API + MCP at https://api.synthflow.ai/v2.\n\n\n## For agents\n\n- This comparison as JSON: https://www.anchorterminal.com/compare/rime-prism-vs-synthflow.json, and with the fewest tokens: https://www.anchorterminal.com/compare/rime-prism-vs-synthflow.min.md\n- Over MCP at https://www.anchorterminal.com/mcp (no key): `compare_tools {\"a\": \"rime-prism\", \"b\": \"synthflow\"}`. From a terminal: `anchor compare rime-prism synthflow`\n- Each listing in full: https://www.anchorterminal.com/api/v1/tools/rime-prism.json and https://www.anchorterminal.com/api/v1/tools/synthflow.json\n\n## Other comparisons with Rime Prism or Synthflow API + MCP\n\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- [Bland AI API + MCP vs Rime Prism](https://www.anchorterminal.com/compare/bland-ai-vs-rime-prism.md)\n- [Bland AI API + MCP vs Synthflow API + MCP](https://www.anchorterminal.com/compare/bland-ai-vs-synthflow.md)\n- [Bolna API + MCP vs Rime Prism](https://www.anchorterminal.com/compare/bolna-vs-rime-prism.md)\n- [Bolna API + MCP vs Synthflow API + MCP](https://www.anchorterminal.com/compare/bolna-vs-synthflow.md)\n- [Deepgram Voice Agent API vs Rime Prism](https://www.anchorterminal.com/compare/deepgram-voice-agent-vs-rime-prism.md)\n- [Deepgram Voice Agent API vs Synthflow API + MCP](https://www.anchorterminal.com/compare/deepgram-voice-agent-vs-synthflow.md)\n- [ElevenLabs Agents API + MCP vs Rime Prism](https://www.anchorterminal.com/compare/elevenlabs-agents-vs-rime-prism.md)\n- [ElevenLabs Agents API + MCP vs Synthflow API + MCP](https://www.anchorterminal.com/compare/elevenlabs-agents-vs-synthflow.md)\n- [Gemini Live API vs Rime Prism](https://www.anchorterminal.com/compare/gemini-live-vs-rime-prism.md)\n- [Gemini Live API vs Synthflow API + MCP](https://www.anchorterminal.com/compare/gemini-live-vs-synthflow.md)\n- [GPT-Live vs Synthflow API + MCP](https://www.anchorterminal.com/compare/gpt-live-vs-synthflow.md)\n- [Harmony.ai vs Rime Prism](https://www.anchorterminal.com/compare/harmony-ai-vs-rime-prism.md)\n- [Harmony.ai vs Synthflow API + MCP](https://www.anchorterminal.com/compare/harmony-ai-vs-synthflow.md)\n- [Hume EVI (Empathic Voice Interface) vs Rime Prism](https://www.anchorterminal.com/compare/hume-evi-vs-rime-prism.md)\n- [Hume EVI (Empathic Voice Interface) vs Synthflow API + MCP](https://www.anchorterminal.com/compare/hume-evi-vs-synthflow.md)\n- [LiveKit Agents vs Rime Prism](https://www.anchorterminal.com/compare/livekit-agents-vs-rime-prism.md)\n- [LiveKit Agents vs Synthflow API + MCP](https://www.anchorterminal.com/compare/livekit-agents-vs-synthflow.md)\n- [OpenAI Realtime API vs Rime Prism](https://www.anchorterminal.com/compare/openai-realtime-vs-rime-prism.md)\n- [OpenAI Realtime API vs Synthflow API + MCP](https://www.anchorterminal.com/compare/openai-realtime-vs-synthflow.md)\n- [Pipecat vs Rime Prism](https://www.anchorterminal.com/compare/pipecat-vs-rime-prism.md)\n- [Pipecat vs Synthflow API + MCP](https://www.anchorterminal.com/compare/pipecat-vs-synthflow.md)\n- [PlaceCall vs Rime Prism](https://www.anchorterminal.com/compare/placecall-vs-rime-prism.md)\n- [PlaceCall vs Synthflow API + MCP](https://www.anchorterminal.com/compare/placecall-vs-synthflow.md)\n- [Retell AI API + MCP vs Rime Prism](https://www.anchorterminal.com/compare/retell-ai-vs-rime-prism.md)\n- [Retell AI API + MCP vs Synthflow API + MCP](https://www.anchorterminal.com/compare/retell-ai-vs-synthflow.md)\n- [Rime Prism vs Vocily AI](https://www.anchorterminal.com/compare/rime-prism-vs-vocily.md)\n- [Rime Prism vs Vogent API](https://www.anchorterminal.com/compare/rime-prism-vs-vogent.md)\n- [Synthflow API + MCP vs Ultravox Realtime API](https://www.anchorterminal.com/compare/synthflow-vs-ultravox.md)\n- [Synthflow API + MCP vs Vapi API + MCP](https://www.anchorterminal.com/compare/synthflow-vs-vapi.md)\n- [Synthflow API + MCP vs Vocily AI](https://www.anchorterminal.com/compare/synthflow-vs-vocily.md)\n- [Synthflow API + MCP vs Vogent API](https://www.anchorterminal.com/compare/synthflow-vs-vogent.md)\n- [CueLight vs Synthflow API + MCP](https://www.anchorterminal.com/compare/cuelight-vs-synthflow.md)\n- [Pipecat PhoneLLM vs Synthflow API + MCP](https://www.anchorterminal.com/compare/pipecat-phonellm-vs-synthflow.md)\n- [GPT-Live vs Rime Prism](https://www.anchorterminal.com/compare/gpt-live-vs-rime-prism.md)\n- [Rime Prism vs Ultravox Realtime API](https://www.anchorterminal.com/compare/rime-prism-vs-ultravox.md)\n- [Rime Prism vs Vapi API + MCP](https://www.anchorterminal.com/compare/rime-prism-vs-vapi.md)\n- [Pipecat PhoneLLM vs Rime Prism](https://www.anchorterminal.com/compare/pipecat-phonellm-vs-rime-prism.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 it from (https://www.anchorterminal.com/terms/#data)", "docs": "https://www.anchorterminal.com/docs/", "generatedAt": "2026-10-29", "license": "CC-BY-4.0", "method": "https://www.anchorterminal.com/benchmark/", "methodology": "0.7", "openapi": "https://www.anchorterminal.com/openapi.json", "preview": false, "run": "2026-10-01", "runLabel": "October 2026 research run", "terms": "https://www.anchorterminal.com/terms/#data" }, "page": { "breadcrumbs": [ { "name": "Home", "url": "https://www.anchorterminal.com/" }, { "name": "Compare", "url": "https://www.anchorterminal.com/compare/" }, { "name": "Rime Prism vs Synthflow API + MCP", "url": "" } ], "description": "Rime Prism scores 57.9 (C) to Synthflow's 51.3 (D) for voice agents. Prices, MCP, x402, uptime and agent notes side by side.", "facts": [ "Rime Prism C 57.9", "Synthflow API + MCP D 51.3", "scores" ], "h1": "Rime Prism vs Synthflow API + MCP", "image": "https://www.anchorterminal.com/assets/og/compare-rime-prism-vs-synthflow.png", "path": "/compare/rime-prism-vs-synthflow", "published": "2026-10-01", "section": "tools", "title": "Rime Prism vs Synthflow for AI agents in 2026: scores and prices", "toc": null, "updated": "2026-10-28", "url": "https://www.anchorterminal.com/compare/rime-prism-vs-synthflow" }, "tokens": { "markdown": 2850, "slim": 630 }, "version": 1 }