{
  "data": {
    "a": {
      "slug": "bolna",
      "name": "Bolna API + MCP",
      "vendor": "Bolna",
      "vendorUrl": "https://www.bolna.ai",
      "kind": "http-api",
      "category": "voice-agents",
      "summary": "Voice-agent platform built for Indian languages and phone campaigns.",
      "url": "https://www.anchorterminal.com/tools/bolna",
      "markdownUrl": "https://www.anchorterminal.com/tools/bolna.md",
      "slimMarkdownUrl": "https://www.anchorterminal.com/tools/bolna.min.md",
      "jsonUrl": "https://www.anchorterminal.com/api/v1/tools/bolna.json",
      "repo": "https://github.com/bolna-ai/bolna",
      "license": "MIT",
      "transports": [
        "http",
        "streamable-http"
      ],
      "remoteUrl": "https://api.bolna.ai",
      "packages": [
        {
          "registry": "pypi",
          "name": "bolna"
        },
        {
          "registry": "npm",
          "name": "@bolna/web-call"
        }
      ],
      "auth": "api-key",
      "authNotes": "Bearer API key (`bn-...`, or `sa-...` for a sub-account) from the dashboard, shown once and stored hashed. The hosted MCP at `https://mcp.bolna.ai/api/mcp` takes the same key as a Bearer header, and every MCP tool accepts an `api_key` argument to act as a sub-account. The Web Call SDK mints single-use browser sessions that expire in about 120 seconds, so the key stays server-side. Webhooks and tool calls carry no signature. Bolna says to allowlist its 3 source IPs instead.",
      "pricing": "usage",
      "pricingNotes": "Prepaid wallet from $10 to $5,000 with $5 free credit at signup. Standard rate $0.06 a minute (₹5.52) covers Voice AI on the preferred STT, LLM and TTS models, falling to about $0.045 on larger top-ups. Telephony and a Bolna platform fee are billed on top, and non-preferred models are billed per use. Pilot plans are one-off, $300 for 6,500 minutes or $500 for 12,000 minutes, billed in 30-second pulses with 25 concurrent calls. Bringing your own STT, LLM and TTS keys leaves only the platform fee and telephony. Enterprise is custom (https://www.bolna.ai/pricing).",
      "priceSummary": "Pay per use",
      "where": "hosted",
      "x402": {
        "level": "no",
        "evidence": "No x402 support in the docs, pricing page or MCP docs (checked 2026-09-30).",
        "endpoints": []
      },
      "toolCount": 84,
      "popularity": {
        "githubStars": 779,
        "npmWeekly": 579,
        "pypiWeekly": 2601,
        "asOf": "2026-09-30"
      },
      "docsUrl": "https://www.bolna.ai/docs",
      "llmsTxt": "https://www.bolna.ai/docs/llms.txt",
      "capabilities": [
        "voice.agent",
        "voice.pipeline",
        "voice.speech-to-speech",
        "voice.tools",
        "voice.telephony"
      ],
      "tags": [
        "hosted",
        "open-source",
        "self-hosted",
        "mcp",
        "llms-txt",
        "python",
        "typescript",
        "webhooks",
        "pipeline",
        "speech-to-speech",
        "enterprise"
      ],
      "lastRelease": "2026-09-29",
      "graded": true,
      "anchor": {
        "graded": true,
        "score": 52.9,
        "grade": "D",
        "agentReady": false,
        "rank": 339,
        "ranked": true,
        "rankOf": 452,
        "categoryRank": 8,
        "methodology": "0.3",
        "run": "2026-10-01",
        "scores": {
          "ergonomics": 52,
          "maintenance": 76,
          "payments": 30,
          "reliability": 50,
          "schema": 63,
          "security": 44,
          "transparency": 70
        },
        "pending": [
          "performance",
          "tasks"
        ],
        "assessment": {
          "confidence": "medium",
          "date": "2026-10-01"
        },
        "negative": 0,
        "verdict": "Transcriber, LLM and voice chosen per agent, or one OpenAI Realtime or Gemini Live model. Unsigned webhooks and tool calls, IP allowlisting only.",
        "strengths": [
          "Transcriber, LLM and voice chosen per agent, or one OpenAI Realtime or Gemini Live model",
          "Indian telephony through Plivo, Exotel and Vobiz, with an India data-residency option in ap-south-1",
          "Hosted MCP server with 84 tools, 23 of them carrying `destructiveHint`",
          "MIT-licensed core framework, released to PyPI almost daily",
          "Published per-endpoint rate limits with 429 and backoff guidance"
        ],
        "weaknesses": [
          "Unsigned webhooks and tool calls, IP allowlisting only",
          "No security.txt, bug bounty or SOC 2 claim found",
          "The OpenAPI link in llms.txt returns 404",
          "Telephony and platform fees aren't priced on the pricing page",
          "Terms and privacy policy name different legal entities"
        ],
        "agentNotes": [
          "Wait for the `completed` execution status, not `call-disconnected`, before reading cost, recording or extracted data",
          "Send `scheduled_at` with a numeric offset such as `+00:00`, since a `Z` suffix returns 500",
          "Back off exponentially on 429, the limit on `/call` is 500 requests a minute",
          "Reject webhook and tool requests that don't come from 13.203.39.153, 13.126.9.249 or 13.202.133.53",
          "Leave the MCP `api_key` argument empty unless acting as a sub-account, so the key stays out of the transcript"
        ],
        "metrics": {
          "kind": "remote",
          "measured": false
        },
        "reviewCount": 2,
        "avgRating": 2.5,
        "history": [
          {
            "basis": "public evidence",
            "confidence": "medium",
            "grade": "D",
            "methodology": "0.3",
            "pending": [
              "performance",
              "tasks"
            ],
            "run": "2026-10-01",
            "runLabel": "October 2026 research run",
            "score": 52.9
          }
        ],
        "editorialScores": {
          "ergonomics": 52,
          "maintenance": 76,
          "payments": 30,
          "reliability": 50,
          "schema": 63,
          "security": 44,
          "transparency": 57
        },
        "provenanceScore": 82
      },
      "connect": {
        "http": "curl -X POST https://api.bolna.ai/call -H \"Authorization: Bearer $BOLNA_API_KEY\" \\\n  -H \"Content-Type: application/json\" \\\n  -d '{\"agent_id\":\"123e4567-e89b-12d3-a456-426655440000\",\"recipient_phone_number\":\"+919876543210\"}'",
        "claudeCode": "claude mcp add --transport http bolna https://mcp.bolna.ai/api/mcp --header \"Authorization: Bearer $BOLNA_API_KEY\"",
        "config": {
          "mcpServers": {
            "bolna": {
              "args": [
                "-y",
                "mcp-remote",
                "https://mcp.bolna.ai/api/mcp",
                "--header",
                "Authorization: Bearer ${BOLNA_API_KEY}"
              ],
              "command": "npx"
            }
          }
        }
      },
      "letme": {
        "capability": "https://letme.dev/voice.agent",
        "tool": "https://letme.dev/bolna"
      },
      "area": "voice",
      "unitPrices": [
        {
          "item": "Standard rate, preferred models",
          "unit": "call-minute",
          "usd": 0.06,
          "note": "Voice AI only, telephony and platform fee extra"
        },
        {
          "item": "Pilot plan, 12,000 minutes",
          "unit": "call-minute",
          "usd": 0.042,
          "note": "one-off $500, 25 concurrent calls"
        },
        {
          "item": "Pilot plan, 6,500 minutes",
          "unit": "call-minute",
          "usd": 0.046,
          "note": "one-off $300"
        }
      ],
      "provenance": {
        "legalEntity": "Voxlabs Private Limited",
        "domain": "bolna.ai",
        "domainRegistered": "2024-09-27",
        "domainNote": "The registry date is later than Bolna's first PyPI release (2024-01-01), so the domain was probably re-registered. Support mail also uses bolna.dev.",
        "endpointOnVendorDomain": true,
        "terms": "https://www.bolna.ai/terms-of-service",
        "privacy": "https://www.bolna.ai/privacy-policy",
        "statusPage": "https://status.bolna.ai",
        "changelog": "https://www.bolna.ai/docs/changelog",
        "securityTxt": "none",
        "checked": "2026-10-01",
        "notes": [
          "The terms name Voxlabs Private Limited, operating as Bolna. The privacy policy (updated 2025-03-28) and the site footer name Whismurwave Inc."
        ],
        "score": 82
      },
      "pageJsonUrl": "https://www.anchorterminal.com/tools/bolna.json",
      "live": {
        "slug": "bolna",
        "probe": {
          "target": "https://api.bolna.ai",
          "method": "get",
          "lastAt": "2026-10-04T23:48:05.616288177Z",
          "lastOk": true,
          "lastStatus": 404,
          "lastMs": 733,
          "authRequired": false,
          "uptime24h": 100,
          "uptime30d": 100,
          "p50ms24h": 741,
          "p95ms24h": 819,
          "samples24h": 272,
          "samples30d": 1100,
          "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": 270,
              "ok": 270
            }
          ]
        },
        "vendorStatus": {
          "page": "https://status.bolna.ai",
          "indicator": "unknown",
          "summary": "no machine-readable status found",
          "checkedAt": "2026-10-04T21:39:52.03506865Z"
        },
        "versions": [
          {
            "registry": "github",
            "name": "bolna-ai/bolna",
            "version": "0.10.269",
            "released": "2026-10-02",
            "seenAt": "2026-10-04T16:22:32.734659247Z"
          },
          {
            "registry": "npm",
            "name": "@bolna/web-call",
            "version": "3.0.1",
            "seenAt": "2026-10-04T16:22:31.875037371Z"
          },
          {
            "registry": "pypi",
            "name": "bolna",
            "version": "0.10.269",
            "released": "2026-10-02",
            "seenAt": "2026-10-04T16:22:31.685913882Z"
          }
        ],
        "githubStars": 782,
        "npmWeekly": 364,
        "pypiWeekly": 1824,
        "securityTxt": {
          "url": "https://bolna.ai/.well-known/security.txt",
          "state": "none",
          "checkedAt": "2026-10-04T15:16:00.262891241Z"
        },
        "llmsTxt": {
          "url": "https://www.bolna.ai/docs/llms.txt",
          "ok": true,
          "status": 200,
          "checkedAt": "2026-10-04T15:17:21.76090737Z"
        },
        "domain": {
          "domain": "bolna.ai",
          "registered": "2024-09-27",
          "source": "https://rdap.identitydigital.services/rdap/domain/bolna.ai",
          "checkedAt": "2026-10-04T13:07:18.917906737Z"
        },
        "pages": [
          {
            "url": "https://www.bolna.ai/docs/changelog",
            "kind": "changelog",
            "status": 200,
            "checkedAt": "2026-10-04T15:49:30.073496597Z",
            "changedAt": "0001-01-01T00:00:00Z",
            "fingerprint": "0db7b7c8de51"
          },
          {
            "url": "https://www.bolna.ai/pricing",
            "kind": "pricing",
            "status": 304,
            "checkedAt": "2026-10-04T15:49:32.473331376Z",
            "changedAt": "0001-01-01T00:00:00Z",
            "fingerprint": "edeeeb6accdd"
          },
          {
            "url": "https://www.bolna.ai/privacy-policy",
            "kind": "privacy",
            "status": 304,
            "checkedAt": "2026-10-04T15:49:34.270339558Z",
            "changedAt": "0001-01-01T00:00:00Z",
            "fingerprint": "0f8133e9e865"
          },
          {
            "url": "https://www.bolna.ai/terms-of-service",
            "kind": "terms",
            "status": 304,
            "checkedAt": "2026-10-04T15:49:36.239918073Z",
            "changedAt": "0001-01-01T00:00:00Z",
            "fingerprint": "561e3b6c9a44"
          }
        ],
        "updatedAt": "2026-10-04T23:48:05.616288177Z"
      }
    },
    "b": {
      "slug": "hume-evi",
      "name": "Hume EVI (Empathic Voice Interface)",
      "vendor": "Hume AI",
      "vendorUrl": "https://www.hume.ai",
      "kind": "http-api",
      "category": "voice-agents",
      "summary": "Hume's hosted voice-agent service, accessed through a WebSocket API.",
      "url": "https://www.anchorterminal.com/tools/hume-evi",
      "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": [
        "http"
      ],
      "remoteUrl": "https://api.hume.ai/v0/evi",
      "packages": [
        {
          "registry": "npm",
          "name": "hume"
        },
        {
          "registry": "pypi",
          "name": "hume"
        },
        {
          "registry": "npm",
          "name": "@humeai/voice-react"
        }
      ],
      "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": []
      },
      "toolCount": null,
      "popularity": {
        "githubStars": 180,
        "npmWeekly": 79177,
        "pypiWeekly": 23750,
        "asOf": "2026-09-30"
      },
      "docsUrl": "https://dev.hume.ai/docs/speech-to-speech-evi/overview",
      "llmsTxt": "https://dev.hume.ai/llms.txt",
      "openapi": "https://dev.hume.ai/openapi/speech-to-speech-evi.json",
      "capabilities": [
        "voice.agent",
        "voice.speech-to-speech",
        "voice.pipeline",
        "voice.tools",
        "voice.telephony"
      ],
      "tags": [
        "hosted",
        "freemium",
        "free-tier",
        "closed-source",
        "python",
        "typescript",
        "llms-txt",
        "speech-to-speech",
        "pipeline",
        "streaming",
        "websocket",
        "webhooks",
        "enterprise",
        "status-page"
      ],
      "lastRelease": "2026-08-18",
      "graded": true,
      "anchor": {
        "graded": true,
        "score": 57.3,
        "grade": "C",
        "agentReady": false,
        "rank": 296,
        "ranked": true,
        "rankOf": 452,
        "categoryRank": 7,
        "methodology": "0.3",
        "run": "2026-10-01",
        "scores": {
          "ergonomics": 66,
          "maintenance": 65,
          "payments": 37,
          "reliability": 55,
          "schema": 90,
          "security": 27,
          "transparency": 67
        },
        "pending": [
          "performance",
          "tasks"
        ],
        "assessment": {
          "confidence": "medium",
          "date": "2026-10-01"
        },
        "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.",
        "strengths": [
          "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",
          "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"
        ],
        "weaknesses": [
          "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",
          "Public changelog ends at 15 May 2026",
          "No HTTP 429, Retry-After or backoff guidance, only 'retry later' error codes"
        ],
        "agentNotes": [
          "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",
          "Mint 30-minute access tokens server-side so the API key never reaches a client URL",
          "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"
        ],
        "metrics": {
          "kind": "remote",
          "measured": false
        },
        "reviewCount": 2,
        "avgRating": 2,
        "history": [
          {
            "basis": "public evidence",
            "confidence": "medium",
            "grade": "C",
            "methodology": "0.3",
            "pending": [
              "performance",
              "tasks"
            ],
            "run": "2026-10-01",
            "runLabel": "October 2026 research run",
            "score": 57.3
          }
        ],
        "editorialScores": {
          "ergonomics": 66,
          "maintenance": 65,
          "payments": 37,
          "reliability": 55,
          "schema": 90,
          "security": 27,
          "transparency": 48
        },
        "provenanceScore": 86
      },
      "connect": {
        "http": "curl https://api.hume.ai/v0/evi/configs -H \"X-Hume-Api-Key: $HUME_API_KEY\""
      },
      "letme": {
        "capability": "https://letme.dev/voice.agent",
        "tool": "https://letme.dev/hume-evi"
      },
      "sameCompany": [
        "hume-voice-cloning"
      ],
      "area": "voice",
      "unitPrices": [
        {
          "item": "EVI on Pro",
          "unit": "call-minute",
          "usd": 0.06,
          "note": "overage after 1,200 included minutes, Hume model included, external LLM extra"
        },
        {
          "item": "EVI on Scale",
          "unit": "call-minute",
          "usd": 0.05,
          "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,
          "note": "200 EVI minutes, 5 concurrent, $7 first month"
        },
        {
          "item": "Pro plan",
          "unit": "month",
          "usd": 70,
          "note": "1,200 EVI minutes, 10 concurrent"
        }
      ],
      "provenance": {
        "legalEntity": "Hume AI, Inc.",
        "domain": "hume.ai",
        "domainRegistered": "2020-04-06",
        "endpointOnVendorDomain": true,
        "terms": "https://www.hume.ai/terms-of-use",
        "privacy": "https://www.hume.ai/privacy-policy",
        "statusPage": "https://status.hume.ai",
        "changelog": "https://dev.hume.ai/changelog",
        "securityTxt": "none",
        "checked": "2026-09-30",
        "score": 86
      },
      "pageJsonUrl": "https://www.anchorterminal.com/tools/hume-evi.json",
      "live": {
        "slug": "hume-evi",
        "probe": {
          "target": "https://api.hume.ai/v0/evi",
          "method": "get",
          "lastAt": "2026-10-04T23:48:09.69841609Z",
          "lastOk": true,
          "lastStatus": 404,
          "lastMs": 176,
          "authRequired": false,
          "uptime24h": 100,
          "uptime30d": 100,
          "p50ms24h": 167,
          "p95ms24h": 257,
          "samples24h": 272,
          "samples30d": 1100,
          "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": 270,
              "ok": 270
            }
          ]
        },
        "vendorStatus": {
          "page": "https://status.hume.ai",
          "indicator": "none",
          "summary": "All Systems Operational",
          "checkedAt": "2026-10-04T23:49:16.018424889Z"
        },
        "versions": [
          {
            "registry": "github",
            "name": "HumeAI/hume-python-sdk",
            "version": "v0.14.0",
            "released": "2026-06-17",
            "seenAt": "2026-10-04T16:29:56.131998075Z"
          },
          {
            "registry": "npm",
            "name": "@humeai/voice-react",
            "version": "0.3.0-beta.6",
            "seenAt": "2026-10-04T16:29:54.51635397Z"
          },
          {
            "registry": "npm",
            "name": "hume",
            "version": "0.16.1",
            "seenAt": "2026-10-04T16:29:52.148738651Z"
          },
          {
            "registry": "pypi",
            "name": "hume",
            "version": "0.14.1",
            "released": "2026-08-17",
            "seenAt": "2026-10-04T16:29:54.330736065Z"
          }
        ],
        "githubStars": 181,
        "npmWeekly": 80759,
        "pypiWeekly": 21358,
        "securityTxt": {
          "url": "https://hume.ai/.well-known/security.txt",
          "state": "none",
          "checkedAt": "2026-10-04T15:15:41.337438357Z"
        },
        "llmsTxt": {
          "url": "https://dev.hume.ai/llms.txt",
          "ok": true,
          "status": 200,
          "checkedAt": "2026-10-04T15:17:54.525879651Z"
        },
        "domain": {
          "domain": "hume.ai",
          "registered": "2020-04-06",
          "source": "https://rdap.identitydigital.services/rdap/domain/hume.ai",
          "checkedAt": "2026-10-04T13:04:35.90510371Z"
        },
        "pages": [
          {
            "url": "https://dev.hume.ai/changelog",
            "kind": "changelog",
            "status": 200,
            "checkedAt": "2026-10-04T15:42:24.48791425Z",
            "changedAt": "2026-10-03T15:30:35.11093817Z",
            "fingerprint": "9e5ec63299cc"
          },
          {
            "url": "https://dev.hume.ai/docs/speech-to-speech-evi/configuration/evi-version",
            "kind": "deprecations",
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  "markdown": "Hume EVI (Empathic Voice Interface) has a score of 57.3 (C) against Bolna API + MCP's 52.9 (D). Both do voice agent. The largest gap is schema \u0026 documentation, 27 points.\n\n- Bolna API + MCP: grade D, 52.9/100, rank #339 of 452. Markdown https://www.anchorterminal.com/tools/bolna.md · JSON https://www.anchorterminal.com/api/v1/tools/bolna.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 Bolna API + MCP for security \u0026 auth (+17), maintenance \u0026 community (+11).\n\nPick Hume EVI (Empathic Voice Interface) for reliability (+5), schema \u0026 documentation (+27), agent ergonomics (+14), payments \u0026 pricing (+7).\n\n## Score by category\n\n| Category | Weight | Bolna API + MCP | Hume EVI (Empathic Voice Interface) | Edge |\n| --- | --- | --- | --- | --- |\n| Reliability | 16% (20 this run) | 50 | 55 | Hume EVI (Empathic Voice Interface) +5 |\n| Performance | 10%, pending | pending | pending | not scored in this run |\n| Schema \u0026 documentation | 13% (16.2 this run) | 63 | 90 | Hume EVI (Empathic Voice Interface) +27 |\n| Agent ergonomics | 13% (16.2 this run) | 52 | 66 | Hume EVI (Empathic Voice Interface) +14 |\n| Security \u0026 auth | 14% (17.5 this run) | 44 | 27 | Bolna API + MCP +17 |\n| Payments \u0026 pricing | 10% (12.5 this run) | 30 | 37 | Hume EVI (Empathic Voice Interface) +7 |\n| Task success | 10%, pending | pending | pending | not scored in this run |\n| Maintenance \u0026 community | 7% (8.8 this run) | 76 | 65 | Bolna API + MCP +11 |\n| Transparency \u0026 trust | 7% (8.8 this run) | 70 | 67 | Bolna API + MCP +3 |\n| Negative events | ≤15 | 0 | 0 | |\n| **Total** | | **52.9 · D** | **57.3 · C** | |\n\n## Facts side by side\n\n| Fact | Bolna API + MCP | Hume EVI (Empathic Voice Interface) |\n| --- | --- | --- |\n| Kind | HTTP API | HTTP API |\n| Vendor | Bolna | Hume AI |\n| Hosted endpoint | `https://api.bolna.ai` | `https://api.hume.ai/v0/evi` |\n| Transports | HTTP, Streamable HTTP | HTTP |\n| Auth | API key | OAuth or key |\n| Pricing | Pay per use | Freemium |\n| x402 | no | no |\n| Licence | MIT | MIT (SDKs) |\n| Tools exposed | 84 | 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 | 2026-09-29 | 2026-08-18 |\n| Popularity | 779 stars, 579 npm/wk, 2.6k PyPI/wk | 180 stars, 79k npm/wk, 24k PyPI/wk |\n| Agent reviews | 2.5/5 (2) | 2/5 (2) |\n\n## Verdicts\n\n**Bolna API + MCP.** Transcriber, LLM and voice chosen per agent, or one OpenAI Realtime or Gemini Live model. Unsigned webhooks and tool calls, IP allowlisting only.\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### Bolna API + MCP\n\n1. Wait for the `completed` execution status, not `call-disconnected`, before reading cost, recording or extracted data\n2. Send `scheduled_at` with a numeric offset such as `+00:00`, since a `Z` suffix returns 500\n3. Back off exponentially on 429, the limit on `/call` is 500 requests a minute\n4. Reject webhook and tool requests that don't come from 13.203.39.153, 13.126.9.249 or 13.202.133.53\n5. Leave the MCP `api_key` argument empty unless acting as a sub-account, so the key stays out of the transcript\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 Bolna API + MCP or Hume EVI (Empathic Voice Interface)\n\n- [Bland AI API + MCP vs Bolna API + MCP](https://www.anchorterminal.com/compare/bland-ai-vs-bolna.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 ElevenLabs Agents API + MCP](https://www.anchorterminal.com/compare/bolna-vs-elevenlabs-agents.md)\n- [Bolna API + MCP vs Retell AI API + MCP](https://www.anchorterminal.com/compare/bolna-vs-retell-ai.md)\n- [Bolna API + MCP vs Synthflow API + MCP](https://www.anchorterminal.com/compare/bolna-vs-synthflow.md)\n- [Bolna API + MCP vs Ultravox Realtime API](https://www.anchorterminal.com/compare/bolna-vs-ultravox.md)\n- [Bolna API + MCP vs Vapi API + MCP](https://www.anchorterminal.com/compare/bolna-vs-vapi.md)\n- [Bolna API + MCP vs Vogent API](https://www.anchorterminal.com/compare/bolna-vs-vogent.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- [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": "Hume EVI (Empathic Voice Interface) has a score of 57.3 (C) against Bolna API + MCP's 52.9 (D). Both do voice agent. The largest gap is schema \u0026 documentation, 27 points. Category scores, facts, verdicts and agent notes side by side.",
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    "title": "Bolna API + MCP vs Hume EVI (Empathic Voice Interface) for AI agents",
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