{
  "data": {
    "a": {
      "slug": "sinch-voice",
      "name": "Sinch Voice API + MCP",
      "vendor": "Sinch",
      "vendorUrl": "https://sinch.com",
      "kind": "http-api",
      "category": "voice-calling",
      "summary": "Programmable voice over PSTN, SIP and WebSocket streams, driven by SVAML call-control JSON.",
      "url": "https://www.anchorterminal.com/tools/sinch-voice",
      "markdownUrl": "https://www.anchorterminal.com/tools/sinch-voice.md",
      "slimMarkdownUrl": "https://www.anchorterminal.com/tools/sinch-voice.min.md",
      "jsonUrl": "https://www.anchorterminal.com/api/v1/tools/sinch-voice.json",
      "repo": "https://github.com/sinch/sinch-mcp-server",
      "license": "Apache-2.0",
      "transports": [
        "http",
        "stdio",
        "streamable-http"
      ],
      "remoteUrl": "https://voice.api.sinch.com/v2",
      "packages": [
        {
          "registry": "npm",
          "name": "@sinch/sdk-core"
        },
        {
          "registry": "pypi",
          "name": "sinch"
        },
        {
          "registry": "npm",
          "name": "@sinch/mcp"
        }
      ],
      "auth": "mixed",
      "authNotes": "Voice API v2 uses a project access key and secret, over Basic auth or as an OAuth 2.0 token. Voice API v1 at calling.api.sinch.com uses an application key and secret with Basic auth or signed requests, and Sinch recommends signed requests in production. Webhooks can be signed.",
      "pricing": "usage",
      "pricingNotes": "Prepaid pay as you go for self-created accounts, with test credits on signup. The downloadable price list gives US outbound at $0.01 a minute, billed in 60-second increments. The pricing page only shows illustrative inbound, SIP, recording and number prices (for example inbound $0.008 a minute and a number at $0.80 a month plus $0.80 setup), so check your dashboard before relying on them. TTS, conferences and IVR menus carry no extra charge (https://sinch.com/pricing/voice/).",
      "priceSummary": "Pay per use",
      "where": "both",
      "x402": {
        "level": "no",
        "evidence": "No x402 or stablecoin payment path in the voice docs, pricing or llms.txt (checked 2026-09-30).",
        "endpoints": []
      },
      "toolCount": null,
      "popularity": {
        "githubStars": 1,
        "npmWeekly": 15648,
        "pypiWeekly": 11166,
        "asOf": "2026-09-30"
      },
      "docsUrl": "https://developers.sinch.com/docs/voice-2.0/overview",
      "llmsTxt": "https://developers.sinch.com/llms.txt",
      "openapi": "https://developers.sinch.com/_bundle/docs/voice-2.0/api-reference/voice.yaml",
      "capabilities": [
        "voice.calls",
        "voice.numbers",
        "voice.streaming",
        "voice.sip",
        "voice.recording",
        "voice.transfer"
      ],
      "tags": [
        "hosted",
        "mcp",
        "llms-txt",
        "typescript",
        "python",
        "webhooks",
        "streaming",
        "batch"
      ],
      "lastRelease": "2026-09-23",
      "graded": true,
      "anchor": {
        "graded": true,
        "score": 62.8,
        "grade": "B",
        "agentReady": false,
        "rank": 212,
        "ranked": true,
        "rankOf": 452,
        "categoryRank": 5,
        "methodology": "0.3",
        "run": "2026-10-01",
        "scores": {
          "ergonomics": 81,
          "maintenance": 79,
          "payments": 35,
          "reliability": 52,
          "schema": 79,
          "security": 50,
          "transparency": 73
        },
        "pending": [
          "performance",
          "tasks"
        ],
        "assessment": {
          "confidence": "medium",
          "date": "2026-10-01"
        },
        "negative": 0,
        "verdict": "Voice API v2 with bidirectional PCM streams and a text relay that handles barge-in. Two API generations with different hosts, auth and markup, and v1 release notes stop in 2022.",
        "strengths": [
          "Voice API v2 with bidirectional PCM streams and a text relay that handles barge-in",
          "Idempotency-Key on v2 call, batch and service writes, with a 10-minute replay window",
          "OpenAPI file for v2, and official SDKs in four languages, with v2 in Node 1.6.0 and Python 2.2.0 since September",
          "Signed callbacks in v1 and v2, and OAuth 2.0 tokens on v2",
          "Test credits and a test number on signup without a card, and ISO 27001 and SOC 2 Type II"
        ],
        "weaknesses": [
          "Two API generations with different hosts, auth and markup, and v1 release notes stop in 2022",
          "No published voice rate limits or SLA, and 429 handling is described only in SDK changelogs",
          "Public pricing is a spreadsheet download plus illustrative examples",
          "The voice MCP is an alpha (0.0.1-alpha.6) that can't stream audio",
          "No security.txt or bug bounty"
        ],
        "agentNotes": [
          "Start new work on Voice API v2 at voice.api.sinch.com. v1 is the older callout model",
          "Send an Idempotency-Key (a UUID v4) on v2 call, batch and service writes, and reuse it when you retry within 10 minutes",
          "Use the MCP tts-callout tool for one-off spoken notifications, and the REST API for anything that streams audio",
          "Trial accounts dial verified numbers only, one call at a time, so verify the test handset first",
          "Verify the webhook signature and deduplicate on `ce-id` and `ce-source`, since fallback delivery can repeat events"
        ],
        "metrics": {
          "kind": "remote",
          "measured": false
        },
        "reviewCount": 2,
        "avgRating": 3,
        "history": [
          {
            "basis": "public evidence",
            "confidence": "medium",
            "grade": "B",
            "methodology": "0.3",
            "pending": [
              "performance",
              "tasks"
            ],
            "run": "2026-10-01",
            "runLabel": "October 2026 research run",
            "score": 62.8
          }
        ],
        "editorialScores": {
          "ergonomics": 81,
          "maintenance": 79,
          "payments": 35,
          "reliability": 52,
          "schema": 79,
          "security": 50,
          "transparency": 55
        },
        "provenanceScore": 90
      },
      "connect": {
        "http": "curl -X POST \"https://voice.api.sinch.com/v2/projects/$SINCH_PROJECT_ID/calls\" -u \"$SINCH_KEY_ID:$SINCH_KEY_SECRET\" \\\n  -H \"Content-Type: application/json\" -d '{\"commands\":[{\"command\":\"dial\",\"callName\":\"origin\",\"from\":{\"type\":\"PHONE\",\"phone\":{\"number\":\"+15551234567\"}},\"to\":{\"type\":\"PHONE\",\"phone\":{\"number\":\"+15559876543\"}},\"events\":{\"onAnswer\":[{\"command\":\"messages\",\"messages\":[{\"type\":\"SAY\",\"say\":{\"text\":\"Hello from Sinch\"}}]}]}}]}'",
        "config": {
          "mcpServers": {
            "sinch": {
              "args": [
                "-y",
                "@sinch/mcp"
              ],
              "command": "npx",
              "env": {
                "APPLICATION_KEY": "${SINCH_APP_KEY}",
                "APPLICATION_SECRET": "${SINCH_APP_SECRET}",
                "CALLING_LINE_IDENTIFICATION": "${SINCH_CLI_NUMBER}",
                "KEY_ID": "${SINCH_KEY_ID}",
                "KEY_SECRET": "${SINCH_KEY_SECRET}",
                "PROJECT_ID": "${SINCH_PROJECT_ID}"
              }
            }
          }
        }
      },
      "letme": {
        "capability": "https://letme.dev/voice.calls",
        "tool": "https://letme.dev/sinch-voice"
      },
      "sameCompany": [
        "sinch"
      ],
      "area": "voice",
      "unitPrices": [
        {
          "item": "US outbound",
          "unit": "call-minute",
          "usd": 0.01,
          "note": "outbound to US numbers, 60-second increments, from the downloadable price list"
        }
      ],
      "provenance": {
        "legalEntity": "Sinch AB (publ)",
        "domain": "sinch.com",
        "domainRegistered": "1997-12-03",
        "endpointOnVendorDomain": true,
        "terms": "https://sinch.com/legal/terms-and-conditions/other-sinch-terms-conditions/general-terms-and-conditions/",
        "privacy": "https://sinch.com/legal/privacy-notice/",
        "statusPage": "https://status.sinch.com",
        "changelog": "https://developers.sinch.com/docs/voice/release-notes",
        "securityTxt": "none",
        "checked": "2026-09-30",
        "notes": [
          "Provenance shared with the Sinch messaging listing. The general terms name the contracting Sinch entity only in the order form, Sinch AB (publ) is the listed parent.",
          "The v1 voice release notes were last updated on 2022-10-06."
        ],
        "score": 90
      },
      "pageJsonUrl": "https://www.anchorterminal.com/tools/sinch-voice.json",
      "live": {
        "slug": "sinch-voice",
        "probe": {
          "target": "https://voice.api.sinch.com/v2",
          "method": "get",
          "lastAt": "2026-10-05T00:25:49.867384874Z",
          "lastOk": true,
          "lastStatus": 404,
          "lastMs": 50,
          "authRequired": false,
          "uptime24h": 100,
          "uptime30d": 100,
          "p50ms24h": 57,
          "p95ms24h": 86,
          "samples24h": 272,
          "samples30d": 1107,
          "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": 5,
              "ok": 5
            }
          ]
        },
        "vendorStatus": {
          "page": "https://status.sinch.com",
          "indicator": "none",
          "summary": "All Systems Operational",
          "checkedAt": "2026-10-05T00:23:01.168928134Z"
        },
        "versions": [
          {
            "registry": "github",
            "name": "sinch/sinch-mcp-server",
            "version": "v0.0.1-alpha6",
            "released": "2026-04-14",
            "seenAt": "2026-10-04T16:40:00.043260291Z"
          },
          {
            "registry": "npm",
            "name": "@sinch/mcp",
            "version": "0.0.1-alpha.6",
            "seenAt": "2026-10-04T16:39:58.580612919Z"
          },
          {
            "registry": "npm",
            "name": "@sinch/sdk-core",
            "version": "1.6.0",
            "seenAt": "2026-10-04T16:39:57.580581644Z"
          },
          {
            "registry": "pypi",
            "name": "sinch",
            "version": "2.2.0",
            "released": "2026-09-21",
            "seenAt": "2026-10-04T16:39:58.396958555Z"
          }
        ],
        "githubStars": 1,
        "npmWeekly": 18032,
        "pypiWeekly": 12911,
        "securityTxt": {
          "url": "https://sinch.com/.well-known/security.txt",
          "state": "none",
          "checkedAt": "2026-10-04T15:15:40.047440487Z"
        },
        "llmsTxt": {
          "url": "https://developers.sinch.com/llms.txt",
          "ok": true,
          "status": 200,
          "checkedAt": "2026-10-04T15:18:13.942714727Z"
        },
        "domain": {
          "domain": "sinch.com",
          "registered": "1997-12-03",
          "source": "https://rdap.verisign.com/com/v1/domain/sinch.com",
          "checkedAt": "2026-10-04T13:05:54.744606475Z"
        },
        "pages": [
          {
            "url": "https://developers.sinch.com/docs/voice/release-notes",
            "kind": "changelog",
            "status": 200,
            "checkedAt": "2026-10-04T15:43:05.083802306Z",
            "changedAt": "2026-10-03T15:31:16.213832084Z",
            "fingerprint": "b3eccb32eaa2"
          },
          {
            "url": "https://sinch.com/pricing/voice/",
            "kind": "pricing",
            "status": 304,
            "checkedAt": "2026-10-04T15:47:54.85828499Z",
            "changedAt": "0001-01-01T00:00:00Z",
            "fingerprint": "123ffc42bc27"
          },
          {
            "url": "https://sinch.com/legal/privacy-notice/",
            "kind": "privacy",
            "status": 304,
            "checkedAt": "2026-10-04T15:47:48.833166192Z",
            "changedAt": "0001-01-01T00:00:00Z",
            "fingerprint": "6c75b4444284"
          },
          {
            "url": "https://sinch.com/legal/terms-and-conditions/other-sinch-terms-conditions/general-terms-and-conditions/",
            "kind": "terms",
            "status": 304,
            "checkedAt": "2026-10-04T15:47:50.854190332Z",
            "changedAt": "0001-01-01T00:00:00Z",
            "fingerprint": "743942fac2a1"
          }
        ],
        "updatedAt": "2026-10-05T00:25:49.867384874Z"
      }
    },
    "b": {
      "slug": "twilio-voice",
      "name": "Twilio Programmable Voice API + MCP",
      "vendor": "Twilio",
      "vendorUrl": "https://www.twilio.com",
      "kind": "http-api",
      "category": "voice-calling",
      "summary": "Programmable Voice for placing and answering calls on Twilio numbers in 100+ countries, controlled with TwiML or REST.",
      "url": "https://www.anchorterminal.com/tools/twilio-voice",
      "markdownUrl": "https://www.anchorterminal.com/tools/twilio-voice.md",
      "slimMarkdownUrl": "https://www.anchorterminal.com/tools/twilio-voice.min.md",
      "jsonUrl": "https://www.anchorterminal.com/api/v1/tools/twilio-voice.json",
      "repo": "https://github.com/twilio-labs/mcp",
      "license": "MIT",
      "transports": [
        "http",
        "streamable-http",
        "stdio"
      ],
      "remoteUrl": "https://api.twilio.com/2010-04-01",
      "packages": [
        {
          "registry": "npm",
          "name": "twilio"
        },
        {
          "registry": "pypi",
          "name": "twilio"
        },
        {
          "registry": "npm",
          "name": "@twilio-alpha/mcp"
        }
      ],
      "auth": "mixed",
      "authNotes": "HTTP Basic auth with the Account SID and Auth Token, or an API key SID and secret (recommended). Webhooks and Media Streams or ConversationRelay websocket connections carry an `X-Twilio-Signature` to validate. The hosted docs MCP needs no credentials. The local alpha MCP takes `ACCOUNT_SID/API_KEY:API_SECRET` as a command-line argument.",
      "pricing": "usage",
      "pricingNotes": "Pay as you go, per minute. US outbound $0.014 a minute, inbound $0.0085 on local numbers and $0.022 on toll-free. Local numbers $1.15 a month, toll-free $2.15. Media Streams $0.0044 a minute, ConversationRelay $0.07 a minute, SIP interface and browser or app calls $0.004 a minute, recording $0.0025 a minute plus $0.0005 a minute a month storage, transcription $0.05 a minute, answering machine detection $0.0075 a call. The trial needs no card and gives free units, including 75 voice minutes, for 30 days (https://www.twilio.com/en-us/voice/pricing/us, https://www.twilio.com/docs/usage/tutorials/how-to-use-your-free-trial-account).",
      "priceSummary": "$1.15 / mo",
      "where": "both",
      "x402": {
        "level": "no",
        "evidence": "No x402 support in docs, pricing or MCP README (checked 2026-09-30).",
        "endpoints": []
      },
      "toolCount": 2,
      "popularity": {
        "githubStars": 111,
        "npmWeekly": 7213599,
        "pypiWeekly": 4834611,
        "asOf": "2026-09-30"
      },
      "docsUrl": "https://www.twilio.com/docs/voice",
      "llmsTxt": "https://www.twilio.com/docs/llms.txt",
      "openapi": "https://raw.githubusercontent.com/twilio/twilio-oai/main/spec/json/twilio_api_v2010.json",
      "capabilities": [
        "voice.calls",
        "voice.numbers",
        "voice.streaming",
        "voice.sip",
        "voice.recording",
        "voice.transfer"
      ],
      "tags": [
        "hosted",
        "no-card",
        "mcp",
        "llms-txt",
        "openapi",
        "typescript",
        "python",
        "webhooks",
        "streaming",
        "enterprise"
      ],
      "lastRelease": "2026-09-28",
      "graded": true,
      "anchor": {
        "graded": true,
        "score": 80.4,
        "grade": "A",
        "agentReady": true,
        "rank": 6,
        "ranked": true,
        "rankOf": 452,
        "categoryRank": 1,
        "methodology": "0.3",
        "run": "2026-10-01",
        "scores": {
          "ergonomics": 80,
          "maintenance": 85,
          "payments": 40,
          "reliability": 90,
          "schema": 92,
          "security": 85,
          "transparency": 81
        },
        "pending": [
          "performance",
          "tasks"
        ],
        "assessment": {
          "confidence": "medium",
          "date": "2026-10-01"
        },
        "negative": 0,
        "verdict": "Twilio APIs SLA at 99.95 per cent for every paying customer, with 10 per cent credits. US outbound at $0.014 a minute, plus $0.0044 for Media Streams or $0.07 for ConversationRelay.",
        "strengths": [
          "Twilio APIs SLA at 99.95 per cent for every paying customer, with 10 per cent credits",
          "Restricted API keys with up to 100 endpoint permissions each",
          "Public OpenAPI specs, llms.txt with Markdown twins, and a numbered error dictionary",
          "No-card trial with 75 free voice minutes for 30 days",
          "twilio-node released three times in the last 90 days, most recently 6.1.2 on 2026-09-28"
        ],
        "weaknesses": [
          "US outbound at $0.014 a minute, plus $0.0044 for Media Streams or $0.07 for ConversationRelay",
          "1 outbound call a second per account by default",
          "No idempotency key on call creation",
          "The MCP that can place calls is an alpha last published in July 2025, and the hosted one only searches docs",
          "No security.txt on twilio.com"
        ],
        "agentNotes": [
          "Use `\u003cConnect\u003e\u003cStream\u003e` for two-way audio. It blocks further TwiML until the websocket closes",
          "Use `\u003cConnect\u003e\u003cConversationRelay\u003e` when you only want to handle text, and set `interruptible` for barge-in",
          "Trial calls reach only verified numbers in your sign-up country",
          "Retry a 429 with backoff, but check the Calls list before retrying a create that timed out, since there's no idempotency key",
          "Validate `X-Twilio-Signature` on every webhook and websocket upgrade"
        ],
        "metrics": {
          "kind": "remote",
          "measured": false
        },
        "reviewCount": 8,
        "avgRating": 3.1,
        "history": [
          {
            "basis": "public evidence",
            "confidence": "medium",
            "grade": "A",
            "methodology": "0.3",
            "pending": [
              "performance",
              "tasks"
            ],
            "run": "2026-10-01",
            "runLabel": "October 2026 research run",
            "score": 80.4
          }
        ],
        "editorialScores": {
          "ergonomics": 80,
          "maintenance": 85,
          "payments": 40,
          "reliability": 90,
          "schema": 92,
          "security": 85,
          "transparency": 72
        },
        "provenanceScore": 90
      },
      "connect": {
        "http": "curl -X POST \"https://api.twilio.com/2010-04-01/Accounts/$TWILIO_ACCOUNT_SID/Calls.json\" \\\n  -u \"$TWILIO_API_KEY:$TWILIO_API_SECRET\" \\\n  --data-urlencode \"To=+15558675310\" --data-urlencode \"From=+15017122661\" \\\n  --data-urlencode \"Twiml=\u003cResponse\u003e\u003cSay\u003eHello from Twilio\u003c/Say\u003e\u003c/Response\u003e\"",
        "claudeCode": "claude mcp add --transport http twilio-docs https://mcp.twilio.com/docs",
        "config": {
          "mcpServers": {
            "twilio": {
              "args": [
                "-y",
                "@twilio-alpha/mcp",
                "${TWILIO_ACCOUNT_SID}/${TWILIO_API_KEY}:${TWILIO_API_SECRET}",
                "--services",
                "twilio_api_v2010"
              ],
              "command": "npx"
            }
          }
        }
      },
      "letme": {
        "capability": "https://letme.dev/voice.calls",
        "tool": "https://letme.dev/twilio-voice"
      },
      "sameCompany": [
        "stytch-connected-apps",
        "sendgrid",
        "twilio"
      ],
      "area": "voice",
      "unitPrices": [
        {
          "item": "Outbound call, US",
          "unit": "call-minute",
          "usd": 0.014,
          "note": "local or toll-free destinations"
        },
        {
          "item": "Inbound call, US local number",
          "unit": "call-minute",
          "usd": 0.0085
        },
        {
          "item": "Inbound call, US toll-free number",
          "unit": "call-minute",
          "usd": 0.022
        },
        {
          "item": "US local number",
          "unit": "month",
          "usd": 1.15
        },
        {
          "item": "US toll-free number",
          "unit": "month",
          "usd": 2.15
        },
        {
          "item": "Media Streams",
          "unit": "call-minute",
          "usd": 0.0044,
          "note": "on top of call minutes"
        },
        {
          "item": "ConversationRelay",
          "unit": "call-minute",
          "usd": 0.07,
          "note": "on top of call minutes"
        },
        {
          "item": "Call recording",
          "unit": "call-minute",
          "usd": 0.0025
        }
      ],
      "provenance": {
        "legalEntity": "Twilio Inc.",
        "domain": "twilio.com",
        "domainRegistered": "2007-10-26",
        "endpointOnVendorDomain": true,
        "terms": "https://www.twilio.com/en-us/legal/tos",
        "privacy": "https://www.twilio.com/en-us/legal/privacy",
        "statusPage": "https://status.twilio.com",
        "changelog": "https://www.twilio.com/en-us/changelog",
        "securityTxt": "none",
        "checked": "2026-09-30",
        "notes": [
          "The terms also name Twilio Ireland Limited for customers outside the US."
        ],
        "score": 90
      },
      "pageJsonUrl": "https://www.anchorterminal.com/tools/twilio-voice.json",
      "live": {
        "slug": "twilio-voice",
        "probe": {
          "target": "https://api.twilio.com/2010-04-01",
          "method": "get",
          "lastAt": "2026-10-05T00:25:51.264031827Z",
          "lastOk": true,
          "lastStatus": 200,
          "lastMs": 31,
          "authRequired": false,
          "uptime24h": 100,
          "uptime30d": 100,
          "p50ms24h": 27,
          "p95ms24h": 66,
          "samples24h": 272,
          "samples30d": 1107,
          "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": 5,
              "ok": 5
            }
          ]
        },
        "vendorStatus": {
          "page": "https://status.twilio.com",
          "indicator": "minor",
          "summary": "Partially Degraded Service",
          "checkedAt": "2026-10-05T00:23:03.539915696Z"
        },
        "versions": [
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            "registry": "github",
            "name": "twilio-labs/mcp",
            "version": "0.0.3",
            "released": "2025-03-25",
            "seenAt": "2026-10-04T16:42:28.341727729Z"
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          {
            "registry": "npm",
            "name": "@twilio-alpha/mcp",
            "version": "0.7.0",
            "seenAt": "2026-10-04T16:42:26.54293887Z"
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            "name": "twilio",
            "version": "6.1.2",
            "seenAt": "2026-10-04T16:42:26.104679108Z"
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            "registry": "pypi",
            "name": "twilio",
            "version": "9.11.2",
            "released": "2026-09-28",
            "seenAt": "2026-10-04T16:42:26.381954279Z"
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        ],
        "githubStars": 112,
        "npmWeekly": 7817134,
        "pypiWeekly": 5153208,
        "securityTxt": {
          "url": "https://twilio.com/.well-known/security.txt",
          "state": "none",
          "checkedAt": "2026-10-04T15:15:43.282608786Z"
        },
        "llmsTxt": {
          "url": "https://www.twilio.com/docs/llms.txt",
          "ok": true,
          "status": 200,
          "checkedAt": "2026-10-04T15:18:18.461750128Z"
        },
        "domain": {
          "domain": "twilio.com",
          "registered": "2007-10-26",
          "source": "https://rdap.verisign.com/com/v1/domain/twilio.com",
          "checkedAt": "2026-10-04T13:05:12.523190086Z"
        },
        "pages": [
          {
            "url": "https://www.twilio.com/en-us/voice/pricing/us",
            "kind": "pricing",
            "status": 200,
            "checkedAt": "2026-10-04T15:52:42.057003458Z",
            "changedAt": "2026-10-03T15:40:33.277161645Z",
            "fingerprint": "870f6e38fa5f"
          }
        ],
        "updatedAt": "2026-10-05T00:25:51.264031827Z"
      }
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  "markdown": "Twilio Programmable Voice API + MCP has a score of 80.4 (A) against Sinch Voice API + MCP's 62.8 (B). Both do voice calls. The largest gap is reliability, 38 points.\n\n- Sinch Voice API + MCP: grade B, 62.8/100, rank #212 of 452. Markdown https://www.anchorterminal.com/tools/sinch-voice.md · JSON https://www.anchorterminal.com/api/v1/tools/sinch-voice.json\n- Twilio Programmable Voice API + MCP: grade A, 80.4/100, rank #6 of 452. Markdown https://www.anchorterminal.com/tools/twilio-voice.md · JSON https://www.anchorterminal.com/api/v1/tools/twilio-voice.json\n\n## Which one, for what\n\nPick Sinch Voice API + MCP for nothing in particular (no category where it leads by five points or more).\n\nPick Twilio Programmable Voice API + MCP for reliability (+38), schema \u0026 documentation (+13), security \u0026 auth (+35), payments \u0026 pricing (+5), maintenance \u0026 community (+6), transparency \u0026 trust (+8).\n\n## Score by category\n\n| Category | Weight | Sinch Voice API + MCP | Twilio Programmable Voice API + MCP | Edge |\n| --- | --- | --- | --- | --- |\n| Reliability | 16% (20 this run) | 52 | 90 | Twilio Programmable Voice API + MCP +38 |\n| Performance | 10%, pending | pending | pending | not scored in this run |\n| Schema \u0026 documentation | 13% (16.2 this run) | 79 | 92 | Twilio Programmable Voice API + MCP +13 |\n| Agent ergonomics | 13% (16.2 this run) | 81 | 80 | Sinch Voice API + MCP +1 |\n| Security \u0026 auth | 14% (17.5 this run) | 50 | 85 | Twilio Programmable Voice API + MCP +35 |\n| Payments \u0026 pricing | 10% (12.5 this run) | 35 | 40 | Twilio Programmable Voice API + MCP +5 |\n| Task success | 10%, pending | pending | pending | not scored in this run |\n| Maintenance \u0026 community | 7% (8.8 this run) | 79 | 85 | Twilio Programmable Voice API + MCP +6 |\n| Transparency \u0026 trust | 7% (8.8 this run) | 73 | 81 | Twilio Programmable Voice API + MCP +8 |\n| Negative events | ≤15 | 0 | 0 | |\n| **Total** | | **62.8 · B** | **80.4 · A** | |\n\n## Facts side by side\n\n| Fact | Sinch Voice API + MCP | Twilio Programmable Voice API + MCP |\n| --- | --- | --- |\n| Kind | HTTP API | HTTP API |\n| Vendor | Sinch | Twilio |\n| Hosted endpoint | `https://voice.api.sinch.com/v2` | `https://api.twilio.com/2010-04-01` |\n| Transports | HTTP, stdio, Streamable HTTP | HTTP, Streamable HTTP, stdio |\n| Auth | OAuth or key | OAuth or key |\n| Pricing | Pay per use | Pay per use |\n| x402 | no | no |\n| Licence | Apache-2.0 | MIT |\n| Tools exposed | none | 2 |\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 | 2026-09-23 | 2026-09-28 |\n| Popularity | 1 stars, 16k npm/wk, 11k PyPI/wk | 111 stars, 7.2M npm/wk, 4.8M PyPI/wk |\n| Agent reviews | 3/5 (2) | 3.1/5 (8) |\n\n## Verdicts\n\n**Sinch Voice API + MCP.** Voice API v2 with bidirectional PCM streams and a text relay that handles barge-in. Two API generations with different hosts, auth and markup, and v1 release notes stop in 2022.\n\n**Twilio Programmable Voice API + MCP.** Twilio APIs SLA at 99.95 per cent for every paying customer, with 10 per cent credits. US outbound at $0.014 a minute, plus $0.0044 for Media Streams or $0.07 for ConversationRelay.\n\n## Before you call either\n\n### Sinch Voice API + MCP\n\n1. Start new work on Voice API v2 at voice.api.sinch.com. v1 is the older callout model\n2. Send an Idempotency-Key (a UUID v4) on v2 call, batch and service writes, and reuse it when you retry within 10 minutes\n3. Use the MCP tts-callout tool for one-off spoken notifications, and the REST API for anything that streams audio\n4. Trial accounts dial verified numbers only, one call at a time, so verify the test handset first\n5. Verify the webhook signature and deduplicate on `ce-id` and `ce-source`, since fallback delivery can repeat events\n\n### Twilio Programmable Voice API + MCP\n\n1. Use `\u003cConnect\u003e\u003cStream\u003e` for two-way audio. It blocks further TwiML until the websocket closes\n2. Use `\u003cConnect\u003e\u003cConversationRelay\u003e` when you only want to handle text, and set `interruptible` for barge-in\n3. Trial calls reach only verified numbers in your sign-up country\n4. Retry a 429 with backoff, but check the Calls list before retrying a create that timed out, since there's no idempotency key\n5. Validate `X-Twilio-Signature` on every webhook and websocket upgrade\n\n## Other comparisons with Sinch Voice API + MCP or Twilio Programmable Voice API + MCP\n\n- [Bandwidth Voice API + MCP vs Sinch Voice API + MCP](https://www.anchorterminal.com/compare/bandwidth-voice-vs-sinch-voice.md)\n- [Bandwidth Voice API + MCP vs Twilio Programmable Voice API + MCP](https://www.anchorterminal.com/compare/bandwidth-voice-vs-twilio-voice.md)\n- [Exotel Voice API + MCP vs Sinch Voice API + MCP](https://www.anchorterminal.com/compare/exotel-voice-vs-sinch-voice.md)\n- [Exotel Voice API + MCP vs Twilio Programmable Voice API + MCP](https://www.anchorterminal.com/compare/exotel-voice-vs-twilio-voice.md)\n- [Infobip Calls API + MCP vs Sinch Voice API + MCP](https://www.anchorterminal.com/compare/infobip-calls-vs-sinch-voice.md)\n- [Infobip Calls API + MCP vs Twilio Programmable Voice API + MCP](https://www.anchorterminal.com/compare/infobip-calls-vs-twilio-voice.md)\n- [Plivo Voice API vs Sinch Voice API + MCP](https://www.anchorterminal.com/compare/plivo-voice-vs-sinch-voice.md)\n- [Plivo Voice API vs Twilio Programmable Voice API + MCP](https://www.anchorterminal.com/compare/plivo-voice-vs-twilio-voice.md)\n- [SignalWire Voice API vs Sinch Voice API + MCP](https://www.anchorterminal.com/compare/signalwire-voice-vs-sinch-voice.md)\n- [SignalWire Voice API vs Twilio Programmable Voice API + MCP](https://www.anchorterminal.com/compare/signalwire-voice-vs-twilio-voice.md)\n- [Sinch Voice API + MCP vs Telnyx Voice API + MCP](https://www.anchorterminal.com/compare/sinch-voice-vs-telnyx-voice.md)\n- [Sinch Voice API + MCP vs Vonage Voice API + MCP](https://www.anchorterminal.com/compare/sinch-voice-vs-vonage-voice.md)\n- [Sinch Voice API + MCP vs Voximplant](https://www.anchorterminal.com/compare/sinch-voice-vs-voximplant.md)\n- [Telnyx Voice API + MCP vs Twilio Programmable Voice API + MCP](https://www.anchorterminal.com/compare/telnyx-voice-vs-twilio-voice.md)\n- [Twilio Programmable Voice API + MCP vs Vonage Voice API + MCP](https://www.anchorterminal.com/compare/twilio-voice-vs-vonage-voice.md)\n- [Twilio Programmable Voice API + MCP vs Voximplant](https://www.anchorterminal.com/compare/twilio-voice-vs-voximplant.md)\n",
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