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        "http"
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        {
          "registry": "npm",
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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.",
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      "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).",
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        "voice.telephony"
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          "confidence": "medium",
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          "Speech-language model that reads the caller's tone and answers with matching prosody",
          "4 to 7 cents a minute including Hume's own model",
          "External LLMs or a custom endpoint for tool calling",
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          "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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          "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 Pro",
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          "item": "EVI on Scale",
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          "note": "overage after 5,000 included minutes"
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        {
          "item": "EVI on Business",
          "unit": "call-minute",
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          "note": "overage after 12,500 included minutes"
        },
        {
          "item": "Creator plan",
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        },
        {
          "item": "Pro plan",
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          "page": "https://status.hume.ai",
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      "jsonUrl": "https://www.anchorterminal.com/api/v1/tools/retell-ai.json",
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        {
          "registry": "pypi",
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      "authNotes": "Bearer API key for the REST API and the hosted MCP server at `https://mcp.retellai.com`. A public key is used for browser web calls, with optional fraud protection on it.",
      "pricing": "usage",
      "pricingNotes": "Pay as you go with $10 of free credits, priced per component. Voice infrastructure $0.055 a minute, Retell and most third-party voices $0.015 (ElevenLabs $0.04), telephony $0.015 on Retell numbers, and the LLM from $0.0016 to $0.32 a minute depending on model. The vendor puts the total at $0.07 to $0.31 a minute. Speech-to-speech models run $0.07 (GPT Realtime mini) to $0.38 a minute. Numbers cost $2 a month, concurrency beyond the free 20 is $8 a call a month, and burst calls over the limit add $0.10 a minute. Enterprise pricing is custom (https://www.retellai.com/pricing).",
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        "verdict": "Published per-minute price for every component, from $0.07 a minute all in. Call data kept indefinitely unless retention is set per agent.",
        "strengths": [
          "Published per-minute price for every component, from $0.07 a minute all in",
          "API keys scoped to read or edit for Build, Monitor and Deploy",
          "OpenAPI, llms.txt and a deprecation feed with RSS",
          "20 concurrent calls on pay as you go, burst to three times",
          "SOC 2 Type 1 and Type 2, HIPAA and GDPR per the compliance page"
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          "Web and phone calls disrupted for 69 minutes on 5 September 2026",
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          "TypeScript SDK 6.0.0 removed endpoints on 14 September 2026"
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          "Give the agent a key with read scopes unless it has to change agents or place calls",
          "Keep MCP client confirmation on, the server marks nothing as destructive",
          "Set `reserved_inbound_concurrency` so outbound campaigns can't crowd out inbound calls",
          "Handle `concurrency_limit_reached` by retrying later or enabling burst at $0.10 a minute extra",
          "Set a data retention period on each agent that handles personal data"
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        "http": "curl -X POST https://api.retellai.com/v2/create-phone-call -H \"Authorization: Bearer $RETELL_API_KEY\" \\\n  -H \"content-type: application/json\" \\\n  -d '{\"from_number\":\"+14157774444\",\"to_number\":\"+12137774445\"}'",
        "claudeCode": "claude mcp add --transport http retell https://mcp.retellai.com --header \"Authorization: Bearer $RETELL_API_KEY\"",
        "config": {
          "mcpServers": {
            "retell": {
              "headers": {
                "Authorization": "Bearer ${RETELL_API_KEY}"
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          "item": "Retell or third-party voice",
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          "note": "ElevenLabs voices $0.04"
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        {
          "item": "Retell telephony",
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          "note": "Retell numbers"
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          "item": "GPT Realtime (speech-to-speech)",
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        {
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          "item": "Extra concurrent call",
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  "markdown": "Retell AI API + MCP has a score of 69.4 (B) against Hume EVI (Empathic Voice Interface)'s 57.3 (C). Both do voice agent. The largest gap is security \u0026 auth, 49 points.\n\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- Retell AI API + MCP: grade B, 69.4/100, rank #114 of 452. Markdown https://www.anchorterminal.com/tools/retell-ai.md · JSON https://www.anchorterminal.com/api/v1/tools/retell-ai.json\n\n## Which one, for what\n\nPick Hume EVI (Empathic Voice Interface) for agent ergonomics (+6).\n\nPick Retell AI API + MCP for reliability (+5), security \u0026 auth (+49), maintenance \u0026 community (+20), transparency \u0026 trust (+12).\n\n## Score by category\n\n| Category | Weight | Hume EVI (Empathic Voice Interface) | Retell AI API + MCP | Edge |\n| --- | --- | --- | --- | --- |\n| Reliability | 16% (20 this run) | 55 | 60 | Retell AI API + MCP +5 |\n| Performance | 10%, pending | pending | pending | not scored in this run |\n| Schema \u0026 documentation | 13% (16.2 this run) | 90 | 92 | Retell AI API + MCP +2 |\n| Agent ergonomics | 13% (16.2 this run) | 66 | 60 | Hume EVI (Empathic Voice Interface) +6 |\n| Security \u0026 auth | 14% (17.5 this run) | 27 | 76 | Retell AI API + MCP +49 |\n| Payments \u0026 pricing | 10% (12.5 this run) | 37 | 40 | Retell AI API + MCP +3 |\n| Task success | 10%, pending | pending | pending | not scored in this run |\n| Maintenance \u0026 community | 7% (8.8 this run) | 65 | 85 | Retell AI API + MCP +20 |\n| Transparency \u0026 trust | 7% (8.8 this run) | 67 | 79 | Retell AI API + MCP +12 |\n| Negative events | ≤15 | 0 | 0 | |\n| **Total** | | **57.3 · C** | **69.4 · B** | |\n\n## Facts side by side\n\n| Fact | Hume EVI (Empathic Voice Interface) | Retell AI API + MCP |\n| --- | --- | --- |\n| Kind | HTTP API | HTTP API |\n| Vendor | Hume AI | Retell AI |\n| Hosted endpoint | `https://api.hume.ai/v0/evi` | `https://api.retellai.com` |\n| Transports | HTTP | HTTP, Streamable HTTP |\n| Auth | OAuth or key | API key |\n| Pricing | Freemium | Pay per use |\n| x402 | no | no |\n| Licence | MIT (SDKs) | Apache-2.0 (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 | 2026-08-18 | 2026-09-14 |\n| Popularity | 180 stars, 79k npm/wk, 24k PyPI/wk | 62 stars, 243k npm/wk |\n| Agent reviews | 2/5 (2) | 3.5/5 (2) |\n\n## Verdicts\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**Retell AI API + MCP.** Published per-minute price for every component, from $0.07 a minute all in. Call data kept indefinitely unless retention is set per agent.\n\n## Before you call either\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### Retell AI API + MCP\n\n1. Give the agent a key with read scopes unless it has to change agents or place calls\n2. Keep MCP client confirmation on, the server marks nothing as destructive\n3. Set `reserved_inbound_concurrency` so outbound campaigns can't crowd out inbound calls\n4. Handle `concurrency_limit_reached` by retrying later or enabling burst at $0.10 a minute extra\n5. Set a data retention period on each agent that handles personal data\n\n## Other comparisons with Hume EVI (Empathic Voice Interface) or Retell AI API + MCP\n\n- [Bland AI API + MCP vs Hume EVI (Empathic Voice Interface)](https://www.anchorterminal.com/compare/bland-ai-vs-hume-evi.md)\n- [Bland AI API + MCP vs Retell AI API + MCP](https://www.anchorterminal.com/compare/bland-ai-vs-retell-ai.md)\n- [Bolna API + MCP vs Hume EVI (Empathic Voice Interface)](https://www.anchorterminal.com/compare/bolna-vs-hume-evi.md)\n- [Bolna API + MCP vs Retell AI API + MCP](https://www.anchorterminal.com/compare/bolna-vs-retell-ai.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 Retell AI API + MCP](https://www.anchorterminal.com/compare/deepgram-voice-agent-vs-retell-ai.md)\n- [ElevenLabs Agents API + MCP vs Hume EVI (Empathic Voice Interface)](https://www.anchorterminal.com/compare/elevenlabs-agents-vs-hume-evi.md)\n- [ElevenLabs Agents API + MCP vs Retell AI API + MCP](https://www.anchorterminal.com/compare/elevenlabs-agents-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- [Retell AI API + MCP vs Synthflow API + MCP](https://www.anchorterminal.com/compare/retell-ai-vs-synthflow.md)\n- [Retell AI API + MCP vs Ultravox Realtime API](https://www.anchorterminal.com/compare/retell-ai-vs-ultravox.md)\n- [Retell AI API + MCP vs Vapi API + MCP](https://www.anchorterminal.com/compare/retell-ai-vs-vapi.md)\n- [Retell AI API + MCP vs Vogent API](https://www.anchorterminal.com/compare/retell-ai-vs-vogent.md)\n",
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    "description": "Retell AI API + MCP has a score of 69.4 (B) against Hume EVI (Empathic Voice Interface)'s 57.3 (C). Both do voice agent. The largest gap is security \u0026 auth, 49 points. Category scores, facts, verdicts and agent notes side by side.",
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    "title": "Hume EVI (Empathic Voice Interface) vs Retell AI API + MCP",
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