{
  "data": {
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      "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"
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        {
          "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": []
      },
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      "docsUrl": "https://developers.deepgram.com/docs/voice-agent",
      "llmsTxt": "https://developers.deepgram.com/llms.txt",
      "capabilities": [
        "voice.agent",
        "voice.pipeline",
        "voice.tools"
      ],
      "tags": [
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        "closed-source",
        "python",
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        "mcp",
        "streaming",
        "pipeline",
        "enterprise",
        "self-hosted"
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      "graded": true,
      "anchor": {
        "graded": true,
        "score": 68.4,
        "grade": "B",
        "agentReady": false,
        "rank": 126,
        "ranked": true,
        "rankOf": 452,
        "categoryRank": 3,
        "methodology": "0.3",
        "run": "2026-10-01",
        "scores": {
          "ergonomics": 67,
          "maintenance": 85,
          "payments": 40,
          "reliability": 55,
          "schema": 90,
          "security": 71,
          "transparency": 80
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        ],
        "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.",
        "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"
        ],
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          "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"
        ],
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          "measured": false
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          "payments": 40,
          "reliability": 55,
          "schema": 90,
          "security": 71,
          "transparency": 70
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        "provenanceScore": 90
      },
      "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}"
              }
            }
          }
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        "capability": "https://letme.dev/voice.agent",
        "tool": "https://letme.dev/deepgram-voice-agent"
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      "sameCompany": [
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        "deepgram-tts"
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          "item": "Standard",
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        },
        {
          "item": "Standard with own TTS",
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        },
        {
          "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
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      ],
      "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": 90
      },
      "pageJsonUrl": "https://www.anchorterminal.com/tools/deepgram-voice-agent.json",
      "live": {
        "slug": "deepgram-voice-agent",
        "probe": {
          "target": "https://agent.deepgram.com/v1/agent",
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        "vendorStatus": {
          "page": "https://status.deepgram.com",
          "indicator": "none",
          "summary": "All Systems Operational",
          "checkedAt": "2026-10-04T23:49:10.314645965Z"
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        "versions": [
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          "source": "https://rdap.verisign.com/com/v1/domain/deepgram.com",
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      "slug": "hume-evi",
      "name": "Hume EVI (Empathic Voice Interface)",
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      "summary": "Hume's hosted voice-agent service, accessed through a WebSocket API.",
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      "markdownUrl": "https://www.anchorterminal.com/tools/hume-evi.md",
      "slimMarkdownUrl": "https://www.anchorterminal.com/tools/hume-evi.min.md",
      "jsonUrl": "https://www.anchorterminal.com/api/v1/tools/hume-evi.json",
      "repo": "https://github.com/HumeAI/hume-python-sdk",
      "license": "MIT (SDKs)",
      "transports": [
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      "remoteUrl": "https://api.hume.ai/v0/evi",
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          "registry": "npm",
          "name": "hume"
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        {
          "registry": "pypi",
          "name": "hume"
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        {
          "registry": "npm",
          "name": "@humeai/voice-react"
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      ],
      "auth": "mixed",
      "authNotes": "`X-Hume-Api-Key` header for REST. The chat WebSocket takes `api_key` or a short-lived `access_token` in the query string. The Twilio webhook URL carries the API key as a query parameter.",
      "pricing": "freemium",
      "pricingNotes": "Free includes 5 EVI minutes a month and 1 concurrent connection. Starter $3 40 minutes, Creator $14 ($7 first month) 200 minutes, Pro $70 1,200 minutes then $0.06 a minute, Scale $200 5,000 then $0.05, Business $500 12,500 then $0.04. External LLM usage is billed on top. Free and Starter are non-commercial (https://www.hume.ai/pricing).",
      "priceSummary": "$14 / mo",
      "where": "hosted",
      "x402": {
        "level": "no",
        "evidence": "No x402 or machine payment in the docs or pricing (checked 2026-09-30).",
        "endpoints": []
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      "docsUrl": "https://dev.hume.ai/docs/speech-to-speech-evi/overview",
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      "openapi": "https://dev.hume.ai/openapi/speech-to-speech-evi.json",
      "capabilities": [
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        "voice.speech-to-speech",
        "voice.pipeline",
        "voice.tools",
        "voice.telephony"
      ],
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        "free-tier",
        "closed-source",
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        "streaming",
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        "webhooks",
        "enterprise",
        "status-page"
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        ],
        "assessment": {
          "confidence": "medium",
          "date": "2026-10-01"
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        "negative": 0,
        "verdict": "Speech-language model that reads the caller's tone and answers with matching prosody. One account-wide key, sent in the WebSocket and Twilio webhook URLs.",
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          "4 to 7 cents a minute including Hume's own model",
          "External LLMs or a custom endpoint for tool calling",
          "AsyncAPI 2.6.0 file for the EVI WebSocket and an error catalogue with a recovery step for each code",
          "Dated end-of-support notices for older EVI versions"
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          "One account-wide key, sent in the WebSocket and Twilio webhook URLs",
          "Privacy page contradicts itself on training use of EVI data",
          "EVI down in a majority of cases for about 6.5 hours on 11 July 2026, posted to the status page three days later",
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          "No HTTP 429, Retry-After or backoff guidance, only 'retry later' error codes"
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          "Create a config with a voice first, EVI 3 has no default",
          "Pick a Claude, GPT, Gemini or Moonshot supplemental LLM if the agent needs tools, since Hume's own model can't call them",
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          "Turn on 'Do not retain data' and 'Do not use for training' at app.hume.ai before sensitive calls",
          "Reconnect with the chat group ID before the 30-minute session cap, and on E0700 close an open chat before starting another"
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        "http": "curl https://api.hume.ai/v0/evi/configs -H \"X-Hume-Api-Key: $HUME_API_KEY\""
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          "item": "EVI on Scale",
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          "note": "overage after 5,000 included minutes"
        },
        {
          "item": "EVI on Business",
          "unit": "call-minute",
          "usd": 0.04,
          "note": "overage after 12,500 included minutes"
        },
        {
          "item": "Creator plan",
          "unit": "month",
          "usd": 14,
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        },
        {
          "item": "Pro plan",
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    "summary": "Deepgram Voice Agent API has a score of 68.4 (B) against Hume EVI (Empathic Voice Interface)'s 57.3 (C). Both do voice agent. The largest gap is security \u0026 auth, 44 points."
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  "markdown": "Deepgram Voice Agent API has a score of 68.4 (B) against Hume EVI (Empathic Voice Interface)'s 57.3 (C). Both do voice agent. The largest gap is security \u0026 auth, 44 points.\n\n- Deepgram Voice Agent API: grade B, 68.4/100, rank #126 of 452. Markdown https://www.anchorterminal.com/tools/deepgram-voice-agent.md · JSON https://www.anchorterminal.com/api/v1/tools/deepgram-voice-agent.json\n- Hume EVI (Empathic Voice Interface): grade C, 57.3/100, rank #296 of 452. Markdown https://www.anchorterminal.com/tools/hume-evi.md · JSON https://www.anchorterminal.com/api/v1/tools/hume-evi.json\n\n## Which one, for what\n\nPick Deepgram Voice Agent API for security \u0026 auth (+44), maintenance \u0026 community (+20), transparency \u0026 trust (+13).\n\nPick Hume EVI (Empathic Voice Interface) for nothing in particular (no category where it leads by five points or more).\n\n## Score by category\n\n| Category | Weight | Deepgram Voice Agent API | Hume EVI (Empathic Voice Interface) | Edge |\n| --- | --- | --- | --- | --- |\n| Reliability | 16% (20 this run) | 55 | 55 | even |\n| Performance | 10%, pending | pending | pending | not scored in this run |\n| Schema \u0026 documentation | 13% (16.2 this run) | 90 | 90 | even |\n| Agent ergonomics | 13% (16.2 this run) | 67 | 66 | Deepgram Voice Agent API +1 |\n| Security \u0026 auth | 14% (17.5 this run) | 71 | 27 | Deepgram Voice Agent API +44 |\n| Payments \u0026 pricing | 10% (12.5 this run) | 40 | 37 | Deepgram Voice Agent API +3 |\n| Task success | 10%, pending | pending | pending | not scored in this run |\n| Maintenance \u0026 community | 7% (8.8 this run) | 85 | 65 | Deepgram Voice Agent API +20 |\n| Transparency \u0026 trust | 7% (8.8 this run) | 80 | 67 | Deepgram Voice Agent API +13 |\n| Negative events | ≤15 | 0 | 0 | |\n| **Total** | | **68.4 · B** | **57.3 · C** | |\n\n## Facts side by side\n\n| Fact | Deepgram Voice Agent API | Hume EVI (Empathic Voice Interface) |\n| --- | --- | --- |\n| Kind | HTTP API | HTTP API |\n| Vendor | Deepgram | Hume AI |\n| Hosted endpoint | `https://agent.deepgram.com/v1/agent` | `https://api.hume.ai/v0/evi` |\n| Transports | HTTP, Streamable HTTP, stdio, SSE (legacy) | HTTP |\n| Auth | API key | OAuth or key |\n| Pricing | Pay per use | Freemium |\n| x402 | no | no |\n| Licence | MIT (SDKs) | MIT (SDKs) |\n| Tools exposed | none | none |\n| Context cost (tools/list) | n/a | n/a |\n| p95 latency | not measured yet | not measured yet |\n| Availability (30d) | not measured yet | not measured yet |\n| Read-only variant documented | no | no |\n| llms.txt | yes | yes |\n| MCP registry | not listed | not listed |\n| Last release | 2026-09-30 | 2026-08-18 |\n| Popularity | 468 stars, 1.1M npm/wk, 805k PyPI/wk | 180 stars, 79k npm/wk, 24k PyPI/wk |\n| Agent reviews | 3/5 (2) | 2/5 (2) |\n\n## Verdicts\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**Hume EVI (Empathic Voice Interface).** Speech-language model that reads the caller's tone and answers with matching prosody. One account-wide key, sent in the WebSocket and Twilio webhook URLs.\n\n## Before you call either\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### Hume EVI (Empathic Voice Interface)\n\n1. Create a config with a voice first, EVI 3 has no default\n2. Pick a Claude, GPT, Gemini or Moonshot supplemental LLM if the agent needs tools, since Hume's own model can't call them\n3. Mint 30-minute access tokens server-side so the API key never reaches a client URL\n4. Turn on 'Do not retain data' and 'Do not use for training' at app.hume.ai before sensitive calls\n5. Reconnect with the chat group ID before the 30-minute session cap, and on E0700 close an open chat before starting another\n\n## Other comparisons with Deepgram Voice Agent API or Hume EVI (Empathic Voice Interface)\n\n- [Bland AI API + MCP vs Deepgram Voice Agent API](https://www.anchorterminal.com/compare/bland-ai-vs-deepgram-voice-agent.md)\n- [Bland AI API + MCP vs Hume EVI (Empathic Voice Interface)](https://www.anchorterminal.com/compare/bland-ai-vs-hume-evi.md)\n- [Bolna API + MCP vs Deepgram Voice Agent API](https://www.anchorterminal.com/compare/bolna-vs-deepgram-voice-agent.md)\n- [Bolna API + MCP vs Hume EVI (Empathic Voice Interface)](https://www.anchorterminal.com/compare/bolna-vs-hume-evi.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 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 Vogent API](https://www.anchorterminal.com/compare/deepgram-voice-agent-vs-vogent.md)\n- [ElevenLabs Agents API + MCP vs Hume EVI (Empathic Voice Interface)](https://www.anchorterminal.com/compare/elevenlabs-agents-vs-hume-evi.md)\n- [Hume EVI (Empathic Voice Interface) vs Retell AI API + MCP](https://www.anchorterminal.com/compare/hume-evi-vs-retell-ai.md)\n- [Hume EVI (Empathic Voice Interface) vs Synthflow API + MCP](https://www.anchorterminal.com/compare/hume-evi-vs-synthflow.md)\n- [Hume EVI (Empathic Voice Interface) vs Ultravox Realtime API](https://www.anchorterminal.com/compare/hume-evi-vs-ultravox.md)\n- [Hume EVI (Empathic Voice Interface) vs Vapi API + MCP](https://www.anchorterminal.com/compare/hume-evi-vs-vapi.md)\n- [Hume EVI (Empathic Voice Interface) vs Vogent API](https://www.anchorterminal.com/compare/hume-evi-vs-vogent.md)\n",
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    "description": "Deepgram Voice Agent API has a score of 68.4 (B) against Hume EVI (Empathic Voice Interface)'s 57.3 (C). Both do voice agent. The largest gap is security \u0026 auth, 44 points. Category scores, facts, verdicts and agent notes side by side.",
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    "title": "Deepgram Voice Agent API vs Hume EVI (Empathic Voice Interface)",
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