{
  "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",
      "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": "$4.50 an hour ($0.075 a minute), billed per second from socket open to session end, idle time included. The rate covers speech-to-text, the managed model, speech output, recordings and hosting. New accounts get $50 of credit with no card, which covers the Voice Agent API. LLM Gateway tokens and Twilio carrier minutes are billed separately. Volume pricing is by sales contact (https://www.assemblyai.com/pricing, https://www.assemblyai.com/docs/billing-and-pricing, checked 2026-10-09).",
      "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",
        "no-card",
        "closed-source",
        "llms-txt",
        "webhooks",
        "streaming",
        "pipeline",
        "python",
        "javascript",
        "status-page",
        "soc2"
      ],
      "lastRelease": "2026-08-26",
      "graded": true,
      "anchor": {
        "graded": true,
        "score": 64.4,
        "grade": "B",
        "agentReady": false,
        "rank": 351,
        "ranked": true,
        "rankOf": 950,
        "categoryRank": 4,
        "methodology": "0.4",
        "run": "2026-10-01",
        "scores": {
          "ergonomics": 72,
          "maintenance": 64,
          "payments": 40,
          "reliability": 60,
          "schema": 83,
          "security": 62,
          "transparency": 66
        },
        "pending": [
          "performance",
          "tasks"
        ],
        "assessment": {
          "confidence": "medium",
          "date": "2026-10-09"
        },
        "negative": 0,
        "verdict": "One $0.075 a minute rate covers speech-to-text, the managed model, speech output, recordings and hosting, and the socket has an AsyncAPI file, typed error codes and a 30-second resume window. No concurrent-session limit is published, the status page has no Voice Agent component, and phone calls are inbound only through a Twilio trunk the customer owns.",
        "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": [
          "One published rate of $4.50 an hour ($0.075 a minute), billed per second, with $50 of credit and no card for new accounts",
          "AsyncAPI 3.0 file for the socket, an OpenAPI file for the token endpoint, llms.txt and a Markdown copy of every 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"
        ],
        "weaknesses": [
          "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",
          "The Terms of Service bar benchmarking and competitive analysis (2.4(f)) and any automated or programmatic method of extracting data or Output (4.4), which matters before any probe is run"
        ],
        "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": 0,
        "avgRating": 0,
        "history": [
          {
            "basis": "public evidence",
            "confidence": "medium",
            "grade": "B",
            "methodology": "0.4",
            "pending": [
              "performance",
              "tasks"
            ],
            "run": "2026-10-01",
            "runLabel": "October 2026 research run",
            "score": 64.4
          }
        ],
        "editorialScores": {
          "ergonomics": 72,
          "maintenance": 64,
          "payments": 40,
          "reliability": 60,
          "schema": 83,
          "security": 62,
          "transparency": 51
        },
        "provenanceScore": 81
      },
      "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",
      "unitPrices": [
        {
          "item": "Voice Agent session",
          "unit": "call-minute",
          "usd": 0.075,
          "note": "$4.50 an hour billed per second of open socket. Speech-to-text, managed model, speech output and recordings included. LLM Gateway tokens and carrier minutes extra"
        }
      ],
      "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": "2026-10-09",
        "score": 81
      },
      "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": "2026-10-10T03:53:19.457306073Z",
          "lastOk": false,
          "lastStatus": 0,
          "lastMs": 0,
          "lastNote": "unsupported protocol scheme \"wss\"",
          "authRequired": false,
          "uptime24h": 0,
          "uptime30d": 0,
          "p50ms24h": 0,
          "p95ms24h": 0,
          "samples24h": 125,
          "samples30d": 125,
          "days": [
            {
              "date": "2026-10-09",
              "probes": 85,
              "ok": 0
            },
            {
              "date": "2026-10-10",
              "probes": 40,
              "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": "2026-10-10T03:57:59.907485515Z"
        },
        "githubStars": 3,
        "pages": [
          {
            "url": "https://www.assemblyai.com/docs/billing-and-pricing",
            "kind": "pricing",
            "status": 200,
            "checkedAt": "2026-10-09T18:48:16.435584974Z",
            "changedAt": "0001-01-01T00:00:00Z",
            "fingerprint": "3b80ad9644cf"
          }
        ],
        "updatedAt": "2026-10-10T03:57:59.907485515Z"
      }
    },
    "answer": "Deepgram Voice Agent API scores 68.1 (B) on agent readiness against AssemblyAI Voice Agent API's 64.4 (B), and leads in 4 of 7 scored categories. AssemblyAI Voice Agent API leads on reliability and agent ergonomics.",
    "b": {
      "slug": "deepgram-voice-agent",
      "name": "Deepgram Voice Agent API",
      "vendor": "Deepgram",
      "vendorUrl": "https://deepgram.com",
      "kind": "http-api",
      "category": "voice-agents",
      "summary": "One WebSocket that runs Deepgram STT (Flux or Nova-3), a managed or bring-your-own LLM and Deepgram or third-party TTS, with turn-taking, barge-in and function calling.",
      "url": "https://www.anchorterminal.com/tools/deepgram-voice-agent",
      "markdownUrl": "https://www.anchorterminal.com/tools/deepgram-voice-agent.md",
      "slimMarkdownUrl": "https://www.anchorterminal.com/tools/deepgram-voice-agent.min.md",
      "jsonUrl": "https://www.anchorterminal.com/api/v1/tools/deepgram-voice-agent.json",
      "repo": "https://github.com/deepgram/deepgram-python-sdk",
      "license": "MIT (SDKs)",
      "transports": [
        "http",
        "streamable-http",
        "stdio",
        "sse"
      ],
      "remoteUrl": "https://agent.deepgram.com/v1/agent",
      "packages": [
        {
          "registry": "npm",
          "name": "@deepgram/sdk"
        },
        {
          "registry": "pypi",
          "name": "deepgram-sdk"
        },
        {
          "registry": "pypi",
          "name": "deepctl"
        }
      ],
      "auth": "api-key",
      "authNotes": "`Authorization: Token \u003ckey\u003e` header on REST and WebSocket calls. Short-lived JWTs (30-second TTL) from the token endpoint for browsers. The `dg` CLI MCP server uses `dg login` credentials or `DEEPGRAM_API_KEY`. The docs MCP needs no key. BYO LLM and TTS providers take their own keys in the `endpoint.headers` of the Settings message.",
      "pricing": "usage",
      "pricingNotes": "Billed per minute of WebSocket connection time. Standard $0.075 a minute pay as you go ($0.068 Growth), Standard with your own TTS $0.065, your own LLM and TTS $0.050 ($0.041 Growth). Advanced tier (larger LLMs such as GPT-5 or Claude Sonnet) $0.163, or $0.122 with your own TTS. $200 free credit with no card. Carrier costs are extra (https://deepgram.com/pricing).",
      "priceSummary": "Pay per use",
      "where": "both",
      "x402": {
        "level": "no",
        "evidence": "No x402 or machine payment in the docs or pricing. Card or prepaid credits only (checked 2026-09-30).",
        "endpoints": []
      },
      "toolCount": null,
      "popularity": {
        "githubStars": 468,
        "npmWeekly": 1123798,
        "pypiWeekly": 805026,
        "asOf": "2026-09-30"
      },
      "docsUrl": "https://developers.deepgram.com/docs/voice-agent",
      "llmsTxt": "https://developers.deepgram.com/llms.txt",
      "capabilities": [
        "voice.agent",
        "voice.pipeline",
        "voice.tools"
      ],
      "tags": [
        "hosted",
        "no-card",
        "closed-source",
        "python",
        "typescript",
        "llms-txt",
        "mcp",
        "streaming",
        "pipeline",
        "enterprise",
        "self-hosted"
      ],
      "lastRelease": "2026-09-30",
      "graded": true,
      "anchor": {
        "graded": true,
        "score": 68.1,
        "grade": "B",
        "agentReady": false,
        "rank": 228,
        "ranked": true,
        "rankOf": 950,
        "categoryRank": 3,
        "methodology": "0.4",
        "run": "2026-10-01",
        "scores": {
          "ergonomics": 67,
          "maintenance": 85,
          "payments": 40,
          "reliability": 55,
          "schema": 90,
          "security": 71,
          "transparency": 77
        },
        "pending": [
          "performance",
          "tasks"
        ],
        "assessment": {
          "confidence": "medium",
          "date": "2026-10-01"
        },
        "negative": 0,
        "verdict": "$0.075 a minute all in on Standard, $0.050 with your own LLM and TTS, $200 of credit with no card. No phone numbers or SIP, so you bridge Twilio or another carrier yourself.",
        "bestFor": "Developers who already run telephony (Twilio, Amazon Connect, Genesys, AudioCodes) and want a cheap managed pipeline with their choice of LLM.",
        "strengths": [
          "$0.075 a minute all in on Standard, $0.050 with your own LLM and TTS, $200 of credit with no card",
          "AsyncAPI description of the agent socket plus a public OpenAPI file",
          "Role-based API keys with expiry and 30-second browser tokens",
          "SDKs in Python, JavaScript, Java, Go, C# and React, updated in September 2026",
          "Function-call hold that waits for a confirmed user turn before irreversible tools run"
        ],
        "weaknesses": [
          "No phone numbers or SIP, so you bridge Twilio or another carrier yourself",
          "Fifteen status incidents since July, four of them an hour or longer on parts the agent uses",
          "Call audio is kept for model improvement unless `mip_opt_out` is set",
          "No SLA terms on self-serve plans",
          "Sessions end at 2 hours"
        ],
        "agentNotes": [
          "Set `mip_opt_out` in the Settings message to keep call audio out of training",
          "Use the function-call hold for anything irreversible, since replies can start before the user's turn is confirmed",
          "Back off exponentially on 429, a pay-as-you-go project gets 45 concurrent sockets",
          "Pin the LLM version, an unpinned Gemini route failed for 1.5 hours on 21 July 2026",
          "Mint browser tokens with `ttl_seconds`, not `ttl`, or they expire after 30 seconds"
        ],
        "metrics": {
          "kind": "remote",
          "measured": false
        },
        "reviewCount": 2,
        "avgRating": 3,
        "history": [
          {
            "basis": "public evidence",
            "confidence": "medium",
            "grade": "B",
            "methodology": "0.4",
            "pending": [
              "performance",
              "tasks"
            ],
            "run": "2026-10-01",
            "runLabel": "October 2026 research run",
            "score": 68.1
          }
        ],
        "editorialScores": {
          "ergonomics": 67,
          "maintenance": 85,
          "payments": 40,
          "reliability": 55,
          "schema": 90,
          "security": 71,
          "transparency": 70
        },
        "provenanceScore": 84
      },
      "connect": {
        "http": "curl https://agent.deepgram.com/v1/agent/settings/think/models \\\n  -H \"Authorization: Token $DEEPGRAM_API_KEY\"",
        "claudeCode": "claude mcp add deepgram-docs --transport http https://api.dx.deepgram.com/kapa/mcp",
        "config": {
          "mcpServers": {
            "deepgram": {
              "args": [
                "mcp"
              ],
              "command": "dg",
              "env": {
                "DEEPGRAM_API_KEY": "${DEEPGRAM_API_KEY}"
              }
            }
          }
        }
      },
      "letme": {
        "capability": "https://letme.dev/voice.agent",
        "tool": "https://letme.dev/deepgram-voice-agent"
      },
      "sameCompany": [
        "deepgram-stt",
        "deepgram-tts"
      ],
      "area": "voice",
      "unitPrices": [
        {
          "item": "Standard",
          "unit": "call-minute",
          "usd": 0.075,
          "note": "pay as you go, Deepgram STT, managed LLM and TTS included, carrier extra"
        },
        {
          "item": "Standard with own TTS",
          "unit": "call-minute",
          "usd": 0.065
        },
        {
          "item": "Own LLM and TTS",
          "unit": "call-minute",
          "usd": 0.05,
          "note": "STT and orchestration only"
        },
        {
          "item": "Advanced",
          "unit": "call-minute",
          "usd": 0.163,
          "note": "larger LLMs, all-in except carrier"
        },
        {
          "item": "Advanced with own TTS",
          "unit": "call-minute",
          "usd": 0.122
        }
      ],
      "provenance": {
        "legalEntity": "Deepgram, Inc.",
        "domain": "deepgram.com",
        "domainRegistered": "2016-01-28",
        "endpointOnVendorDomain": true,
        "terms": "https://deepgram.com/terms",
        "privacy": "https://deepgram.com/privacy",
        "statusPage": "https://status.deepgram.com",
        "changelog": "https://developers.deepgram.com/changelog",
        "securityTxt": "none",
        "checked": "2026-09-30",
        "score": 84
      },
      "pageJsonUrl": "https://www.anchorterminal.com/tools/deepgram-voice-agent.json",
      "live": {
        "slug": "deepgram-voice-agent",
        "probe": {
          "target": "https://agent.deepgram.com/v1/agent",
          "method": "get",
          "lastAt": "2026-10-10T03:53:25.130363858Z",
          "lastOk": true,
          "lastStatus": 404,
          "lastMs": 539,
          "authRequired": false,
          "uptime24h": 100,
          "uptime30d": 100,
          "p50ms24h": 424,
          "p95ms24h": 598,
          "samples24h": 249,
          "samples30d": 2476,
          "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": 40,
              "ok": 40
            }
          ]
        },
        "vendorStatus": {
          "page": "https://status.deepgram.com",
          "indicator": "none",
          "summary": "All Systems Operational",
          "checkedAt": "2026-10-10T03:58:13.625792957Z"
        },
        "versions": [
          {
            "registry": "github",
            "name": "deepgram/deepgram-python-sdk",
            "version": "v7.12.0",
            "released": "2026-10-02",
            "seenAt": "2026-10-09T16:49:12.382344264Z"
          },
          {
            "registry": "npm",
            "name": "@deepgram/sdk",
            "version": "5.14.0",
            "seenAt": "2026-10-09T16:49:10.025630638Z"
          },
          {
            "registry": "pypi",
            "name": "deepctl",
            "version": "0.3.2",
            "released": "2026-10-05",
            "seenAt": "2026-10-09T16:49:10.494851797Z"
          },
          {
            "registry": "pypi",
            "name": "deepgram-sdk",
            "version": "7.12.0",
            "released": "2026-10-02",
            "seenAt": "2026-10-09T16:49:10.353407788Z"
          }
        ],
        "githubStars": 469,
        "npmWeekly": 913554,
        "pypiWeekly": 787283,
        "securityTxt": {
          "url": "https://deepgram.com/.well-known/security.txt",
          "state": "none",
          "checkedAt": "2026-10-09T15:40:20.111519289Z"
        },
        "llmsTxt": {
          "url": "https://developers.deepgram.com/llms.txt",
          "ok": true,
          "status": 200,
          "checkedAt": "2026-10-09T14:01:51.303442979Z"
        },
        "domain": {
          "domain": "deepgram.com",
          "registered": "2016-01-28",
          "source": "https://rdap.verisign.com/com/v1/domain/deepgram.com",
          "checkedAt": "2026-10-04T13:03:28.939824686Z"
        },
        "updatedAt": "2026-10-10T03:58:13.625792957Z"
      }
    },
    "facts": [
      {
        "a": "HTTP API",
        "b": "HTTP API",
        "name": "Kind"
      },
      {
        "a": "AssemblyAI, Inc.",
        "b": "Deepgram",
        "name": "Vendor"
      },
      {
        "a": "wss://agents.assemblyai.com/v1/ws",
        "b": "https://agent.deepgram.com/v1/agent",
        "name": "Hosted endpoint"
      },
      {
        "a": "HTTP",
        "b": "HTTP, Streamable HTTP, stdio, SSE (legacy)",
        "name": "Transports"
      },
      {
        "a": "API key",
        "b": "API key",
        "name": "Auth"
      },
      {
        "a": "Pay per use",
        "b": "Pay per use",
        "name": "Pricing"
      },
      {
        "a": "$0.075 per minute of call",
        "b": "not published",
        "name": "Price for voice agents"
      },
      {
        "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": "MIT (SDKs)",
        "name": "Licence"
      },
      {
        "a": "no",
        "b": "no",
        "name": "Read-only variant documented"
      },
      {
        "a": "yes",
        "b": "yes",
        "name": "llms.txt"
      },
      {
        "a": "2026-08-26",
        "b": "2026-09-30",
        "name": "Last release"
      },
      {
        "a": "2026-07-01",
        "b": "2026-08-06",
        "name": "Terms last updated"
      },
      {
        "a": "2026-05-26",
        "b": "2021-10-26",
        "name": "Privacy policy last updated"
      },
      {
        "a": "yes, with an opt-out",
        "b": "yes, with an opt-out",
        "name": "Customer content may train models"
      },
      {
        "a": "yes",
        "b": "not found in the text",
        "name": "Terms restrict automated access"
      },
      {
        "a": "yes",
        "b": "yes",
        "name": "Terms restrict benchmarking"
      },
      {
        "a": "not found in the text",
        "b": "yes",
        "name": "Terms or service can change without notice"
      },
      {
        "a": "not found in the text",
        "b": "yes",
        "name": "Arbitration or class-action waiver"
      },
      {
        "a": "none",
        "b": "468 stars, 1.1M npm/wk, 805k PyPI/wk",
        "name": "Popularity"
      },
      {
        "a": "none",
        "b": "3/5 (2)",
        "name": "Agent reviews"
      }
    ],
    "faq": [
      {
        "answer": "Deepgram Voice Agent API scores 68.1 (B) on agent readiness against AssemblyAI Voice Agent API's 64.4 (B), and leads in 4 of 7 scored categories. AssemblyAI Voice Agent API leads on reliability and agent ergonomics.",
        "question": "Which is better for AI agents, AssemblyAI Voice Agent API or Deepgram Voice Agent API?"
      },
      {
        "answer": "Both need an API key.",
        "question": "Do AssemblyAI Voice Agent API and Deepgram Voice Agent API need an API key?"
      },
      {
        "answer": "Yes. AssemblyAI Voice Agent API has a hosted endpoint at wss://agents.assemblyai.com/v1/ws and Deepgram Voice Agent API at https://agent.deepgram.com/v1/agent.",
        "question": "Can an agent call AssemblyAI Voice Agent API and Deepgram Voice Agent API without installing anything?"
      }
    ],
    "goodFor": [
      {
        "aheadOn": [
          "Reliability, 60 against 55",
          "Agent ergonomics, 72 against 67"
        ],
        "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 number is published for the concurrent-session limit that the `concurrency_exceeded` error enforces"
      },
      {
        "aheadOn": [
          "Schema \u0026 documentation, 90 against 83",
          "Security \u0026 auth, 71 against 62",
          "Maintenance \u0026 community, 85 against 64",
          "Transparency \u0026 trust, 77 against 66"
        ],
        "also": [
          "Runs on your own machine"
        ],
        "goodFor": "Developers who already run telephony (Twilio, Amazon Connect, Genesys, AudioCodes) and want a cheap managed pipeline with their choice of LLM.",
        "slug": "deepgram-voice-agent",
        "watchFor": "No phone numbers or SIP, so you bridge Twilio or another carrier yourself"
      }
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        "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",
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      {
        "json": "https://www.anchorterminal.com/compare/assemblyai-voice-agent-vs-elevenlabs-agents.json",
        "title": "AssemblyAI Voice Agent API vs ElevenLabs Agents API + MCP",
        "url": "https://www.anchorterminal.com/compare/assemblyai-voice-agent-vs-elevenlabs-agents"
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      {
        "json": "https://www.anchorterminal.com/compare/assemblyai-voice-agent-vs-gemini-live.json",
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      {
        "json": "https://www.anchorterminal.com/compare/assemblyai-voice-agent-vs-hume-evi.json",
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        "url": "https://www.anchorterminal.com/compare/assemblyai-voice-agent-vs-hume-evi"
      },
      {
        "json": "https://www.anchorterminal.com/compare/assemblyai-voice-agent-vs-openai-realtime.json",
        "title": "AssemblyAI Voice Agent API vs OpenAI Realtime API",
        "url": "https://www.anchorterminal.com/compare/assemblyai-voice-agent-vs-openai-realtime"
      },
      {
        "json": "https://www.anchorterminal.com/compare/assemblyai-voice-agent-vs-retell-ai.json",
        "title": "AssemblyAI Voice Agent API vs Retell AI API + MCP",
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      {
        "json": "https://www.anchorterminal.com/compare/assemblyai-voice-agent-vs-synthflow.json",
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        "url": "https://www.anchorterminal.com/compare/assemblyai-voice-agent-vs-synthflow"
      },
      {
        "json": "https://www.anchorterminal.com/compare/assemblyai-voice-agent-vs-ultravox.json",
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        "url": "https://www.anchorterminal.com/compare/assemblyai-voice-agent-vs-ultravox"
      },
      {
        "json": "https://www.anchorterminal.com/compare/assemblyai-voice-agent-vs-vapi.json",
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        "url": "https://www.anchorterminal.com/compare/assemblyai-voice-agent-vs-vapi"
      },
      {
        "json": "https://www.anchorterminal.com/compare/assemblyai-voice-agent-vs-vocily.json",
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        "url": "https://www.anchorterminal.com/compare/assemblyai-voice-agent-vs-vocily"
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      {
        "json": "https://www.anchorterminal.com/compare/assemblyai-voice-agent-vs-vogent.json",
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      {
        "json": "https://www.anchorterminal.com/compare/bland-ai-vs-deepgram-voice-agent.json",
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        "url": "https://www.anchorterminal.com/compare/bland-ai-vs-deepgram-voice-agent"
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      {
        "json": "https://www.anchorterminal.com/compare/bolna-vs-deepgram-voice-agent.json",
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        "url": "https://www.anchorterminal.com/compare/bolna-vs-deepgram-voice-agent"
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      {
        "json": "https://www.anchorterminal.com/compare/deepgram-voice-agent-vs-elevenlabs-agents.json",
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        "json": "https://www.anchorterminal.com/compare/deepgram-voice-agent-vs-gemini-live.json",
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        "url": "https://www.anchorterminal.com/compare/deepgram-voice-agent-vs-gemini-live"
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      {
        "json": "https://www.anchorterminal.com/compare/deepgram-voice-agent-vs-hume-evi.json",
        "title": "Deepgram Voice Agent API vs Hume EVI (Empathic Voice Interface)",
        "url": "https://www.anchorterminal.com/compare/deepgram-voice-agent-vs-hume-evi"
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      {
        "json": "https://www.anchorterminal.com/compare/deepgram-voice-agent-vs-openai-realtime.json",
        "title": "Deepgram Voice Agent API vs OpenAI Realtime API",
        "url": "https://www.anchorterminal.com/compare/deepgram-voice-agent-vs-openai-realtime"
      },
      {
        "json": "https://www.anchorterminal.com/compare/deepgram-voice-agent-vs-retell-ai.json",
        "title": "Deepgram Voice Agent API vs Retell AI API + MCP",
        "url": "https://www.anchorterminal.com/compare/deepgram-voice-agent-vs-retell-ai"
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      {
        "json": "https://www.anchorterminal.com/compare/deepgram-voice-agent-vs-synthflow.json",
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        "url": "https://www.anchorterminal.com/compare/deepgram-voice-agent-vs-synthflow"
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        "json": "https://www.anchorterminal.com/compare/deepgram-voice-agent-vs-ultravox.json",
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        "url": "https://www.anchorterminal.com/compare/deepgram-voice-agent-vs-vapi"
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    "scores": [
      {
        "assemblyai-voice-agent": 60,
        "by": 5,
        "deepgram-voice-agent": 55,
        "edge": "assemblyai-voice-agent",
        "key": "reliability",
        "name": "Reliability",
        "weight": 16
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      {
        "key": "performance",
        "name": "Performance",
        "pending": true,
        "weight": 10
      },
      {
        "assemblyai-voice-agent": 83,
        "by": 7,
        "deepgram-voice-agent": 90,
        "edge": "deepgram-voice-agent",
        "key": "schema",
        "name": "Schema \u0026 documentation",
        "weight": 13
      },
      {
        "assemblyai-voice-agent": 72,
        "by": 5,
        "deepgram-voice-agent": 67,
        "edge": "assemblyai-voice-agent",
        "key": "ergonomics",
        "name": "Agent ergonomics",
        "weight": 13
      },
      {
        "assemblyai-voice-agent": 62,
        "by": 9,
        "deepgram-voice-agent": 71,
        "edge": "deepgram-voice-agent",
        "key": "security",
        "name": "Security \u0026 auth",
        "weight": 14
      },
      {
        "assemblyai-voice-agent": 40,
        "by": 0,
        "deepgram-voice-agent": 40,
        "edge": "",
        "key": "payments",
        "name": "Payments \u0026 pricing",
        "weight": 10
      },
      {
        "key": "tasks",
        "name": "Task success",
        "pending": true,
        "weight": 10
      },
      {
        "assemblyai-voice-agent": 64,
        "by": 21,
        "deepgram-voice-agent": 85,
        "edge": "deepgram-voice-agent",
        "key": "maintenance",
        "name": "Maintenance \u0026 community",
        "weight": 7
      },
      {
        "assemblyai-voice-agent": 66,
        "by": 11,
        "deepgram-voice-agent": 77,
        "edge": "deepgram-voice-agent",
        "key": "transparency",
        "name": "Transparency \u0026 trust",
        "weight": 7
      }
    ],
    "summary": "Deepgram Voice Agent API scores 68.1 (B) on agent readiness against AssemblyAI Voice Agent API's 64.4 (B), and leads in 4 of 7 scored categories. AssemblyAI Voice Agent API leads on reliability and agent ergonomics. Both do voice agents.",
    "verdicts": {
      "assemblyai-voice-agent": "One $0.075 a minute rate covers speech-to-text, the managed model, speech output, recordings and hosting, and the socket has an AsyncAPI file, typed error codes and a 30-second resume window. No concurrent-session limit is published, the status page has no Voice Agent component, and phone calls are inbound only through a Twilio trunk the customer owns.",
      "deepgram-voice-agent": "$0.075 a minute all in on Standard, $0.050 with your own LLM and TTS, $200 of credit with no card. No phone numbers or SIP, so you bridge Twilio or another carrier yourself."
    }
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  "markdown": "Deepgram Voice Agent API scores 68.1 (B) on agent readiness against AssemblyAI Voice Agent API's 64.4 (B), and leads in 4 of 7 scored categories. AssemblyAI Voice Agent API leads on reliability and agent ergonomics. Both do voice agents.\n\n- AssemblyAI Voice Agent API: grade B, 64.4/100, rank #351 of 950. Markdown https://www.anchorterminal.com/tools/assemblyai-voice-agent.md · JSON https://www.anchorterminal.com/api/v1/tools/assemblyai-voice-agent.json\n- Deepgram Voice Agent API: grade B, 68.1/100, rank #228 of 950. Markdown https://www.anchorterminal.com/tools/deepgram-voice-agent.md · JSON https://www.anchorterminal.com/api/v1/tools/deepgram-voice-agent.json\n- Best conversational voice-agent APIs: https://www.anchorterminal.com/best/voice-agents/index.md\n- All 91 voice agents comparisons: https://www.anchorterminal.com/compare/voice-agents/index.md\n\n## Which one, for what\n\n### AssemblyAI Voice Agent API (B)\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, 60 against 55\n- Agent ergonomics, 72 against 67\n\nWatch for: No number is published for the concurrent-session limit that the `concurrency_exceeded` error enforces\n\n### Deepgram Voice Agent API (B)\n\nGood for: Developers who already run telephony (Twilio, Amazon Connect, Genesys, AudioCodes) and want a cheap managed pipeline with their choice of LLM.\n\nAhead on:\n- Schema \u0026 documentation, 90 against 83\n- Security \u0026 auth, 71 against 62\n- Maintenance \u0026 community, 85 against 64\n- Transparency \u0026 trust, 77 against 66\n\nAlso in its favour:\n- Runs on your own machine\n\nWatch for: No phone numbers or SIP, so you bridge Twilio or another carrier yourself\n\n\n## Score by category\n\n| Category | Weight | AssemblyAI Voice Agent API | Deepgram Voice Agent API | Edge |\n| --- | --- | --- | --- | --- |\n| Reliability | 16% (20 this run) | 60 | 55 | AssemblyAI Voice Agent API +5 |\n| Performance | 10%, pending | pending | pending | not scored in this run |\n| Schema \u0026 documentation | 13% (16.2 this run) | 83 | 90 | Deepgram Voice Agent API +7 |\n| Agent ergonomics | 13% (16.2 this run) | 72 | 67 | AssemblyAI Voice Agent API +5 |\n| Security \u0026 auth | 14% (17.5 this run) | 62 | 71 | Deepgram Voice Agent API +9 |\n| Payments \u0026 pricing | 10% (12.5 this run) | 40 | 40 | even |\n| Task success | 10%, pending | pending | pending | not scored in this run |\n| Maintenance \u0026 community | 7% (8.8 this run) | 64 | 85 | Deepgram Voice Agent API +21 |\n| Transparency \u0026 trust | 7% (8.8 this run) | 66 | 77 | Deepgram Voice Agent API +11 |\n| Negative events | ≤15 | 0 | 0 | |\n| **Total** | | **64.4 · B** | **68.1 · B** | |\n\n## Facts side by side\n\n| Fact | AssemblyAI Voice Agent API | Deepgram Voice Agent API |\n| --- | --- | --- |\n| Kind | HTTP API | HTTP API |\n| Vendor | AssemblyAI, Inc. | Deepgram |\n| Hosted endpoint | `wss://agents.assemblyai.com/v1/ws` | `https://agent.deepgram.com/v1/agent` |\n| Transports | HTTP | HTTP, Streamable HTTP, stdio, SSE (legacy) |\n| Auth | API key | API key |\n| Pricing | Pay per use | Pay per use |\n| Price for voice agents | $0.075 per minute of call | not published |\n| x402 | no | no |\n| Licence | Proprietary service under AssemblyAI's Terms of Service. The two starter repositories on GitHub carry no licence file | MIT (SDKs) |\n| Read-only variant documented | no | no |\n| llms.txt | yes | yes |\n| Last release | 2026-08-26 | 2026-09-30 |\n| Terms last updated | 2026-07-01 | 2026-08-06 |\n| Privacy policy last updated | 2026-05-26 | 2021-10-26 |\n| Customer content may train models | yes, with an opt-out | yes, with an opt-out |\n| Terms restrict automated access | yes | not found in the text |\n| Terms restrict benchmarking | yes | yes |\n| Terms or service can change without notice | not found in the text | yes |\n| Arbitration or class-action waiver | not found in the text | yes |\n| Popularity | none | 468 stars, 1.1M npm/wk, 805k PyPI/wk |\n| Agent reviews | none | 3/5 (2) |\n\n## Verdicts\n\n**AssemblyAI Voice Agent API.** One $0.075 a minute rate covers speech-to-text, the managed model, speech output, recordings and hosting, and the socket has an AsyncAPI file, typed error codes and a 30-second resume window. No concurrent-session limit is published, the status page has no Voice Agent component, and phone calls are inbound only through a Twilio trunk the customer owns.\n\n**Deepgram Voice Agent API.** $0.075 a minute all in on Standard, $0.050 with your own LLM and TTS, $200 of credit with no card. No phone numbers or SIP, so you bridge Twilio or another carrier yourself.\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### Deepgram Voice Agent API\n\n1. Set `mip_opt_out` in the Settings message to keep call audio out of training\n2. Use the function-call hold for anything irreversible, since replies can start before the user's turn is confirmed\n3. Back off exponentially on 429, a pay-as-you-go project gets 45 concurrent sockets\n4. Pin the LLM version, an unpinned Gemini route failed for 1.5 hours on 21 July 2026\n5. Mint browser tokens with `ttl_seconds`, not `ttl`, or they expire after 30 seconds\n\n## Questions\n\n### Which is better for AI agents, AssemblyAI Voice Agent API or Deepgram Voice Agent API?\n\nDeepgram Voice Agent API scores 68.1 (B) on agent readiness against AssemblyAI Voice Agent API's 64.4 (B), and leads in 4 of 7 scored categories. AssemblyAI Voice Agent API leads on reliability and agent ergonomics.\n\n### Do AssemblyAI Voice Agent API and Deepgram Voice Agent API need an API key?\n\nBoth need an API key.\n\n### Can an agent call AssemblyAI Voice Agent API and Deepgram Voice Agent API without installing anything?\n\nYes. AssemblyAI Voice Agent API has a hosted endpoint at wss://agents.assemblyai.com/v1/ws and Deepgram Voice Agent API at https://agent.deepgram.com/v1/agent.\n\n\n## For agents\n\n- This comparison as JSON: https://www.anchorterminal.com/compare/assemblyai-voice-agent-vs-deepgram-voice-agent.json, and with the fewest tokens: https://www.anchorterminal.com/compare/assemblyai-voice-agent-vs-deepgram-voice-agent.min.md\n- Over MCP at https://www.anchorterminal.com/mcp (no key): `compare_tools {\"a\": \"assemblyai-voice-agent\", \"b\": \"deepgram-voice-agent\"}`. From a terminal: `anchor compare assemblyai-voice-agent deepgram-voice-agent`\n- Each listing in full: https://www.anchorterminal.com/api/v1/tools/assemblyai-voice-agent.json and https://www.anchorterminal.com/api/v1/tools/deepgram-voice-agent.json\n\n## Other comparisons with AssemblyAI Voice Agent API or Deepgram Voice Agent API\n\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 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 Hume EVI (Empathic Voice Interface)](https://www.anchorterminal.com/compare/assemblyai-voice-agent-vs-hume-evi.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 Retell AI API + MCP](https://www.anchorterminal.com/compare/assemblyai-voice-agent-vs-retell-ai.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 Vapi API + MCP](https://www.anchorterminal.com/compare/assemblyai-voice-agent-vs-vapi.md)\n- [AssemblyAI Voice Agent API vs Vocily AI](https://www.anchorterminal.com/compare/assemblyai-voice-agent-vs-vocily.md)\n- [AssemblyAI Voice Agent API vs Vogent API](https://www.anchorterminal.com/compare/assemblyai-voice-agent-vs-vogent.md)\n- [Bland AI API + MCP vs Deepgram Voice Agent API](https://www.anchorterminal.com/compare/bland-ai-vs-deepgram-voice-agent.md)\n- [Bolna API + MCP vs Deepgram Voice Agent API](https://www.anchorterminal.com/compare/bolna-vs-deepgram-voice-agent.md)\n- [Deepgram Voice Agent API vs ElevenLabs Agents API + MCP](https://www.anchorterminal.com/compare/deepgram-voice-agent-vs-elevenlabs-agents.md)\n- [Deepgram Voice Agent API vs Gemini Live API](https://www.anchorterminal.com/compare/deepgram-voice-agent-vs-gemini-live.md)\n- [Deepgram Voice Agent API vs Hume EVI (Empathic Voice Interface)](https://www.anchorterminal.com/compare/deepgram-voice-agent-vs-hume-evi.md)\n- [Deepgram Voice Agent API vs OpenAI Realtime API](https://www.anchorterminal.com/compare/deepgram-voice-agent-vs-openai-realtime.md)\n- [Deepgram Voice Agent API vs Retell AI API + MCP](https://www.anchorterminal.com/compare/deepgram-voice-agent-vs-retell-ai.md)\n- [Deepgram Voice Agent API vs Synthflow API + MCP](https://www.anchorterminal.com/compare/deepgram-voice-agent-vs-synthflow.md)\n- [Deepgram Voice Agent API vs Ultravox Realtime API](https://www.anchorterminal.com/compare/deepgram-voice-agent-vs-ultravox.md)\n- [Deepgram Voice Agent API vs Vapi API + MCP](https://www.anchorterminal.com/compare/deepgram-voice-agent-vs-vapi.md)\n- [Deepgram Voice Agent API vs Vocily AI](https://www.anchorterminal.com/compare/deepgram-voice-agent-vs-vocily.md)\n- [Deepgram Voice Agent API vs Vogent API](https://www.anchorterminal.com/compare/deepgram-voice-agent-vs-vogent.md)\n",
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