{
  "data": {
    "a": {
      "slug": "telnyx-voice",
      "name": "Telnyx Voice API + MCP",
      "vendor": "Telnyx",
      "vendorUrl": "https://telnyx.com",
      "kind": "http-api",
      "category": "voice-calling",
      "summary": "Carrier-owned Voice API (Call Control and TeXML) for calls, numbers, websocket media streaming, recording and transfers on Telnyx's own network.",
      "url": "https://www.anchorterminal.com/tools/telnyx-voice",
      "markdownUrl": "https://www.anchorterminal.com/tools/telnyx-voice.md",
      "slimMarkdownUrl": "https://www.anchorterminal.com/tools/telnyx-voice.min.md",
      "jsonUrl": "https://www.anchorterminal.com/api/v1/tools/telnyx-voice.json",
      "repo": "https://github.com/team-telnyx/telnyx-node",
      "license": "MIT",
      "transports": [
        "http",
        "streamable-http",
        "stdio"
      ],
      "remoteUrl": "https://api.telnyx.com/v2",
      "packages": [
        {
          "registry": "npm",
          "name": "telnyx"
        },
        {
          "registry": "npm",
          "name": "telnyx-mcp"
        },
        {
          "registry": "pypi",
          "name": "telnyx"
        }
      ],
      "auth": "mixed",
      "authNotes": "Bearer API key from the portal for the REST API and the hosted MCP endpoint. Claude custom connectors can instead grant access through the Telnyx portal. Call Control webhooks are signed.",
      "pricing": "usage",
      "pricingNotes": "Pay as you go with no minimum and no free credit. Fund by card, or by x402 (USDC on Base), MPP or ACP top-ups through the API. Voice API fee $0.002 a minute each way, plus SIP trunking billed separately. US local termination from $0.005 a minute, local origination from $0.0032, toll-free origination from $0.015. US local and toll-free numbers $1 a month. Recording $0.002 a minute, media streaming $0.0035 a minute, conferencing $0.002 a participant a minute, answering machine detection $0.002 a call. AI Assistants and Conversation Relay $0.05 a minute. Committed plans from $500 a month (https://telnyx.com/pricing/call-control, https://telnyx.com/agent-signup.md).",
      "priceSummary": "$1 / mo",
      "where": "both",
      "x402": {
        "level": "partial",
        "evidence": "Telnyx's agent signup guide documents POST https://api.telnyx.com/v2/x402/credit_account to top up account credit in USDC on Base, alongside MPP at /v2/machine-payments/account-credit and ACP checkout sessions. These are account top-ups, not per-call payments on the voice endpoints, and per-payment limits aren't published. Not tested by us (https://telnyx.com/agent-signup.md, checked 2026-10-01).",
        "endpoints": [
          {
            "url": "https://api.telnyx.com/v2/x402/credit_account",
            "priceUsd": null,
            "network": "eip155:8453"
          }
        ]
      },
      "toolCount": 3,
      "popularity": {
        "githubStars": 197,
        "npmWeekly": 416629,
        "pypiWeekly": 178817,
        "asOf": "2026-09-30"
      },
      "docsUrl": "https://developers.telnyx.com/docs/voice/programmable-voice/get-started",
      "llmsTxt": "https://developers.telnyx.com/llms.txt",
      "openapi": "https://raw.githubusercontent.com/team-telnyx/openapi/master/openapi/spec3.json",
      "registryName": "io.github.team-telnyx/telnyx",
      "capabilities": [
        "voice.calls",
        "voice.numbers",
        "voice.streaming",
        "voice.sip",
        "voice.recording",
        "voice.transfer"
      ],
      "tags": [
        "hosted",
        "mcp",
        "llms-txt",
        "openapi",
        "typescript",
        "python",
        "webhooks",
        "streaming",
        "x402",
        "stablecoin",
        "prepaid"
      ],
      "lastRelease": "2026-09-25",
      "graded": true,
      "anchor": {
        "graded": true,
        "score": 74.4,
        "grade": "BB",
        "agentReady": true,
        "rank": 48,
        "ranked": true,
        "rankOf": 452,
        "categoryRank": 2,
        "methodology": "0.3",
        "run": "2026-10-01",
        "scores": {
          "ergonomics": 90,
          "maintenance": 83,
          "payments": 65,
          "reliability": 75,
          "schema": 93,
          "security": 45,
          "transparency": 73
        },
        "pending": [
          "performance",
          "tasks"
        ],
        "assessment": {
          "confidence": "medium",
          "date": "2026-10-01"
        },
        "negative": 0,
        "verdict": "About $0.007 a minute all-in for US outbound ($0.002 Voice API plus $0.005 termination). x402 and MPP only top up credit, they don't pay per call.",
        "strengths": [
          "About $0.007 a minute all-in for US outbound ($0.002 Voice API plus $0.005 termination)",
          "Bot signup, API key creation and x402 or MPP account top-ups without a browser",
          "30 outbound dials a second, Retry-After on 429, and command_id to de-duplicate retried call commands",
          "OpenAPI spec, llms.txt, pricing.md and an MCP in the official registry",
          "SOC 2 Type II and ISO 27001"
        ],
        "weaknesses": [
          "x402 and MPP only top up credit, they don't pay per call",
          "No free credit, a new account starts at zero",
          "No scoped or read-only API keys found, and the MCP can dial and buy numbers without confirmation",
          "One-way or degraded call audio for about 12 hours from 10 September, and API 5XX errors for about 2 hours on 23 September",
          "No security.txt, bug bounty or deprecation policy found"
        ],
        "agentNotes": [
          "Create a Call Control application first. `POST /v2/calls` needs its `connection_id`",
          "Fund a new account through /v2/x402/credit_account or MPP before buying a number, since it starts at zero",
          "Only one media stream or fork runs per call, and starting a fork replaces the websocket stream",
          "Add the Voice API fee and SIP trunking rate together when pricing a call",
          "Set a unique command_id on every call command, so a retry after a timeout is ignored rather than repeated"
        ],
        "metrics": {
          "kind": "remote",
          "measured": false
        },
        "reviewCount": 8,
        "avgRating": 3.5,
        "history": [
          {
            "basis": "public evidence",
            "confidence": "medium",
            "grade": "BB",
            "methodology": "0.3",
            "pending": [
              "performance",
              "tasks"
            ],
            "run": "2026-10-01",
            "runLabel": "October 2026 research run",
            "score": 74.4
          }
        ],
        "editorialScores": {
          "ergonomics": 90,
          "maintenance": 83,
          "payments": 65,
          "reliability": 75,
          "schema": 93,
          "security": 45,
          "transparency": 55
        },
        "provenanceScore": 90
      },
      "connect": {
        "http": "curl -X POST https://api.telnyx.com/v2/calls -H \"Authorization: Bearer $TELNYX_API_KEY\" \\\n  -H \"Content-Type: application/json\" \\\n  -d '{\"connection_id\":\"7267xxxxxxxxxxxxxx\",\"to\":\"+15559876543\",\"from\":\"+15551234567\"}'",
        "claudeCode": "claude mcp add --transport http telnyx https://api.telnyx.com/v2/mcp --header \"Authorization: Bearer $TELNYX_API_KEY\"",
        "config": {
          "mcpServers": {
            "telnyx": {
              "args": [
                "-y",
                "telnyx-mcp"
              ],
              "command": "npx",
              "env": {
                "TELNYX_API_KEY": "${TELNYX_API_KEY}"
              }
            }
          }
        }
      },
      "letme": {
        "capability": "https://letme.dev/voice.calls",
        "tool": "https://letme.dev/telnyx-voice"
      },
      "sameCompany": [
        "telnyx"
      ],
      "area": "voice",
      "unitPrices": [
        {
          "item": "Voice API fee, US outbound",
          "unit": "call-minute",
          "usd": 0.002,
          "note": "SIP termination billed on top"
        },
        {
          "item": "SIP termination, US local",
          "unit": "call-minute",
          "usd": 0.005,
          "note": "starting rate, add to the Voice API fee"
        },
        {
          "item": "Voice API fee, US inbound",
          "unit": "call-minute",
          "usd": 0.002,
          "note": "SIP origination billed on top"
        },
        {
          "item": "SIP origination, US local",
          "unit": "call-minute",
          "usd": 0.0032,
          "note": "starting rate"
        },
        {
          "item": "US local number",
          "unit": "month",
          "usd": 1
        },
        {
          "item": "Media streaming",
          "unit": "call-minute",
          "usd": 0.0035
        },
        {
          "item": "Call recording",
          "unit": "call-minute",
          "usd": 0.002
        },
        {
          "item": "AI Assistant on a call",
          "unit": "call-minute",
          "usd": 0.05,
          "note": "includes STT, LLM and TTS"
        }
      ],
      "provenance": {
        "legalEntity": "Telnyx LLC",
        "domain": "telnyx.com",
        "domainRegistered": "2009-05-04",
        "endpointOnVendorDomain": true,
        "terms": "https://telnyx.com/terms-and-conditions-of-service",
        "privacy": "https://telnyx.com/privacy-policy",
        "statusPage": "https://status.telnyx.com",
        "changelog": "https://telnyx.com/release-notes",
        "securityTxt": "none",
        "checked": "2026-09-30",
        "score": 90
      },
      "pageJsonUrl": "https://www.anchorterminal.com/tools/telnyx-voice.json",
      "live": {
        "slug": "telnyx-voice",
        "probe": {
          "target": "https://api.telnyx.com/v2",
          "method": "get",
          "lastAt": "2026-10-04T23:48:16.884811721Z",
          "lastOk": true,
          "lastStatus": 404,
          "lastMs": 125,
          "authRequired": false,
          "uptime24h": 100,
          "uptime30d": 100,
          "p50ms24h": 131,
          "p95ms24h": 179,
          "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.telnyx.com",
          "indicator": "maintenance",
          "summary": "Under Maintenance",
          "checkedAt": "2026-10-04T23:49:29.440458562Z"
        },
        "versions": [
          {
            "registry": "github",
            "name": "team-telnyx/telnyx-node",
            "version": "v7.24.0",
            "released": "2026-09-25",
            "seenAt": "2026-10-04T16:41:29.493877068Z"
          },
          {
            "registry": "npm",
            "name": "telnyx",
            "version": "7.24.0",
            "seenAt": "2026-10-04T16:41:27.091742528Z"
          },
          {
            "registry": "npm",
            "name": "telnyx-mcp",
            "version": "7.24.0",
            "seenAt": "2026-10-04T16:41:27.511074933Z"
          },
          {
            "registry": "pypi",
            "name": "telnyx",
            "version": "4.182.0",
            "released": "2026-09-25",
            "seenAt": "2026-10-04T16:41:29.302568773Z"
          }
        ],
        "githubStars": 197,
        "npmWeekly": 490168,
        "pypiWeekly": 201435,
        "securityTxt": {
          "url": "https://telnyx.com/.well-known/security.txt",
          "state": "none",
          "checkedAt": "2026-10-04T15:16:05.446481255Z"
        },
        "llmsTxt": {
          "url": "https://developers.telnyx.com/llms.txt",
          "ok": true,
          "status": 200,
          "checkedAt": "2026-10-04T15:18:17.91217441Z"
        },
        "domain": {
          "domain": "telnyx.com",
          "registered": "2009-05-04",
          "source": "https://rdap.verisign.com/com/v1/domain/telnyx.com",
          "checkedAt": "2026-10-04T13:09:33.721251862Z"
        },
        "pages": [
          {
            "url": "https://telnyx.com/release-notes",
            "kind": "changelog",
            "status": 200,
            "checkedAt": "2026-10-04T15:48:27.454526964Z",
            "changedAt": "2026-10-03T15:36:23.545689762Z",
            "fingerprint": "7dbe8c4f1bae"
          },
          {
            "url": "https://telnyx.com/pricing/call-control",
            "kind": "pricing",
            "status": 200,
            "checkedAt": "2026-10-04T15:48:20.898706649Z",
            "changedAt": "2026-10-04T15:48:20.898706649Z",
            "fingerprint": "30c2be8962d3"
          },
          {
            "url": "https://telnyx.com/privacy-policy",
            "kind": "privacy",
            "status": 200,
            "checkedAt": "2026-10-04T15:48:25.893595009Z",
            "changedAt": "2026-10-04T15:48:25.893595009Z",
            "fingerprint": "8367d06cc9a7"
          },
          {
            "url": "https://telnyx.com/terms-and-conditions-of-service",
            "kind": "terms",
            "status": 200,
            "checkedAt": "2026-10-04T15:48:29.33763712Z",
            "changedAt": "2026-10-04T15:48:29.33763712Z",
            "fingerprint": "d7cf989996f4"
          }
        ],
        "updatedAt": "2026-10-04T23:49:29.440458562Z"
      }
    },
    "b": {
      "slug": "voximplant",
      "name": "Voximplant",
      "vendor": "Voximplant",
      "vendorUrl": "https://voximplant.com",
      "kind": "http-api",
      "category": "voice-calling",
      "summary": "Serverless platform for programmable calling.",
      "url": "https://www.anchorterminal.com/tools/voximplant",
      "markdownUrl": "https://www.anchorterminal.com/tools/voximplant.md",
      "slimMarkdownUrl": "https://www.anchorterminal.com/tools/voximplant.min.md",
      "jsonUrl": "https://www.anchorterminal.com/api/v1/tools/voximplant.json",
      "repo": "https://github.com/voximplant/apiclient-nodejs",
      "license": "Apache-2.0",
      "transports": [
        "http"
      ],
      "remoteUrl": "https://api.voximplant.com/platform_api",
      "packages": [
        {
          "registry": "npm",
          "name": "@voximplant/apiclient-nodejs"
        },
        {
          "registry": "pypi",
          "name": "voximplant-apiclient"
        }
      ],
      "auth": "mixed",
      "authNotes": "Management API accepts a service-account JWT (RS256, up to one hour) as a Bearer token, or an account ID and API key in the query string. Prefer the JWT, since query-string keys end up in logs.",
      "pricing": "usage",
      "pricingNotes": "Pay as you go in USD. US outbound $0.017 a minute to landlines and mobiles, inbound $0.005, toll-free inbound $0.03. US numbers $1.50 a month plus $1.50 setup, toll-free $3 a month. WebSocket audio streaming $0.001 per 15 seconds per direction ($0.004 a minute each way). Voice AI connectors $0.001 per 15 seconds ($0.004 a minute), including a bidirectional stream. Recording $0.001 a minute to your own S3 or $0.0015 with 3-month cloud storage. Speech recognition $0.034 a minute (https://voximplant.com/pricing).",
      "priceSummary": "$1.50 / mo",
      "where": "hosted",
      "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": 15,
        "npmWeekly": 1419,
        "pypiWeekly": 930,
        "asOf": "2026-09-30"
      },
      "docsUrl": "https://docs.voximplant.ai",
      "llmsTxt": "https://docs.voximplant.ai/llms.txt",
      "openapi": "https://docs.voximplant.ai/openapi.json",
      "capabilities": [
        "voice.calls",
        "voice.numbers",
        "voice.streaming",
        "voice.sip",
        "voice.recording",
        "voice.transfer"
      ],
      "tags": [
        "hosted",
        "llms-txt",
        "openapi",
        "typescript",
        "python",
        "streaming",
        "webhooks"
      ],
      "lastRelease": "2026-08-26",
      "graded": true,
      "anchor": {
        "graded": true,
        "score": 51.9,
        "grade": "D",
        "agentReady": false,
        "rank": 346,
        "ranked": true,
        "rankOf": 452,
        "categoryRank": 9,
        "methodology": "0.3",
        "run": "2026-10-01",
        "scores": {
          "ergonomics": 45,
          "maintenance": 50,
          "payments": 25,
          "reliability": 65,
          "schema": 71,
          "security": 40,
          "transparency": 63
        },
        "pending": [
          "performance",
          "tasks"
        ],
        "assessment": {
          "confidence": "medium",
          "date": "2026-10-01"
        },
        "negative": 0,
        "verdict": "Call logic runs next to the media, with connectors for the main speech-to-speech models at $0.004 a minute. Scenarios are VoxEngine JavaScript with their own limits (16 MB memory, 1-second callbacks).",
        "strengths": [
          "Call logic runs next to the media, with connectors for the main speech-to-speech models at $0.004 a minute",
          "Service-account JWTs that expire within an hour, with roles per account",
          "OpenAPI spec for the Management API and an llms.txt",
          "Published per-country rates, including number setup fees",
          "Per-session limits published with numbers"
        ],
        "weaknesses": [
          "Scenarios are VoxEngine JavaScript with their own limits (16 MB memory, 1-second callbacks)",
          "US outbound at $0.017 a minute is higher than most here",
          "API key accepted in the query string, and no security.txt",
          "No public changelog, SLA or deprecation policy found",
          "No action MCP server, docs search only"
        ],
        "agentNotes": [
          "Upload a VoxEngine scenario and a rule first, then start it with StartScenarios and pass the number in script_custom_data",
          "Use a service-account JWT rather than api_key in the URL",
          "Give the service account only the roles the agent needs, such as Scenarios",
          "Ask support to lift the 20-cent destination block before calling expensive routes"
        ],
        "metrics": {
          "kind": "remote",
          "measured": false
        },
        "reviewCount": 2,
        "avgRating": 3,
        "history": [
          {
            "basis": "public evidence",
            "confidence": "medium",
            "grade": "D",
            "methodology": "0.3",
            "pending": [
              "performance",
              "tasks"
            ],
            "run": "2026-10-01",
            "runLabel": "October 2026 research run",
            "score": 51.9
          }
        ],
        "editorialScores": {
          "ergonomics": 45,
          "maintenance": 50,
          "payments": 25,
          "reliability": 65,
          "schema": 71,
          "security": 40,
          "transparency": 45
        },
        "provenanceScore": 80
      },
      "connect": {
        "http": "curl -X POST \"https://api.voximplant.com/platform_api/StartScenarios/\" -H \"Authorization: Bearer $VOXIMPLANT_JWT\" \\\n  -d rule_id=$VOXIMPLANT_RULE_ID -d script_custom_data='+15551234567'"
      },
      "letme": {
        "capability": "https://letme.dev/voice.calls",
        "tool": "https://letme.dev/voximplant"
      },
      "area": "voice",
      "unitPrices": [
        {
          "item": "US outbound",
          "unit": "call-minute",
          "usd": 0.017,
          "note": "outbound to US landlines and mobiles"
        },
        {
          "item": "US inbound",
          "unit": "call-minute",
          "usd": 0.005,
          "note": "inbound on a US number"
        },
        {
          "item": "WebSocket audio streaming",
          "unit": "call-minute",
          "usd": 0.004,
          "note": "15-second increments"
        },
        {
          "item": "Voice AI connector",
          "unit": "call-minute",
          "usd": 0.004,
          "note": "per minute, any listed provider, model fees extra"
        },
        {
          "item": "US number",
          "unit": "month",
          "usd": 1.5,
          "note": "plus $1.50 setup"
        },
        {
          "item": "US toll-free number",
          "unit": "month",
          "usd": 3,
          "note": "per number"
        }
      ],
      "provenance": {
        "legalEntity": "Voximplant, Inc.",
        "domain": "voximplant.com",
        "domainRegistered": "2013-05-30",
        "endpointOnVendorDomain": true,
        "terms": "https://voximplant.com/legal/tos",
        "privacy": "https://voximplant.com/legal/privacy",
        "statusPage": "https://status.voximplant.com",
        "changelog": "",
        "securityTxt": "none",
        "checked": "2026-09-30",
        "notes": [
          "Legal entity from the terms of service. No public changelog found."
        ],
        "score": 80
      },
      "pageJsonUrl": "https://www.anchorterminal.com/tools/voximplant.json",
      "live": {
        "slug": "voximplant",
        "probe": {
          "target": "https://api.voximplant.com/platform_api",
          "method": "get",
          "lastAt": "2026-10-04T23:48:18.313756979Z",
          "lastOk": true,
          "lastStatus": 200,
          "lastMs": 58,
          "authRequired": false,
          "uptime24h": 100,
          "uptime30d": 100,
          "p50ms24h": 60,
          "p95ms24h": 85,
          "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.voximplant.com",
          "indicator": "none",
          "summary": "All Systems Operational",
          "checkedAt": "2026-10-04T23:49:30.73546758Z"
        },
        "versions": [
          {
            "registry": "npm",
            "name": "@voximplant/apiclient-nodejs",
            "version": "4.11.0",
            "seenAt": "2026-10-04T16:43:49.611417657Z"
          },
          {
            "registry": "pypi",
            "name": "voximplant-apiclient",
            "version": "2.10.0",
            "released": "2026-08-26",
            "seenAt": "2026-10-04T16:43:50.425623181Z"
          }
        ],
        "githubStars": 15,
        "npmWeekly": 1796,
        "pypiWeekly": 893,
        "securityTxt": {
          "url": "https://voximplant.com/.well-known/security.txt",
          "state": "none",
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            "changedAt": "2026-10-02T15:25:01.512055599Z",
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            "changedAt": "2026-10-02T15:24:57.214600772Z",
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        "updatedAt": "2026-10-04T23:49:30.73546758Z"
      }
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    "summary": "Telnyx Voice API + MCP has a score of 74.4 (BB) against Voximplant's 51.9 (D). Both do voice calls. The largest gap is agent ergonomics, 45 points."
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  "markdown": "Telnyx Voice API + MCP has a score of 74.4 (BB) against Voximplant's 51.9 (D). Both do voice calls. The largest gap is agent ergonomics, 45 points.\n\n- Telnyx Voice API + MCP: grade BB, 74.4/100, rank #48 of 452. Markdown https://www.anchorterminal.com/tools/telnyx-voice.md · JSON https://www.anchorterminal.com/api/v1/tools/telnyx-voice.json\n- Voximplant: grade D, 51.9/100, rank #346 of 452. Markdown https://www.anchorterminal.com/tools/voximplant.md · JSON https://www.anchorterminal.com/api/v1/tools/voximplant.json\n\n## Which one, for what\n\nPick Telnyx Voice API + MCP for reliability (+10), schema \u0026 documentation (+22), agent ergonomics (+45), security \u0026 auth (+5), payments \u0026 pricing (+40), maintenance \u0026 community (+33), transparency \u0026 trust (+10).\n\nPick Voximplant for nothing in particular (no category where it leads by five points or more).\n\n## Score by category\n\n| Category | Weight | Telnyx Voice API + MCP | Voximplant | Edge |\n| --- | --- | --- | --- | --- |\n| Reliability | 16% (20 this run) | 75 | 65 | Telnyx Voice API + MCP +10 |\n| Performance | 10%, pending | pending | pending | not scored in this run |\n| Schema \u0026 documentation | 13% (16.2 this run) | 93 | 71 | Telnyx Voice API + MCP +22 |\n| Agent ergonomics | 13% (16.2 this run) | 90 | 45 | Telnyx Voice API + MCP +45 |\n| Security \u0026 auth | 14% (17.5 this run) | 45 | 40 | Telnyx Voice API + MCP +5 |\n| Payments \u0026 pricing | 10% (12.5 this run) | 65 | 25 | Telnyx Voice API + MCP +40 |\n| Task success | 10%, pending | pending | pending | not scored in this run |\n| Maintenance \u0026 community | 7% (8.8 this run) | 83 | 50 | Telnyx Voice API + MCP +33 |\n| Transparency \u0026 trust | 7% (8.8 this run) | 73 | 63 | Telnyx Voice API + MCP +10 |\n| Negative events | ≤15 | 0 | 0 | |\n| **Total** | | **74.4 · BB** | **51.9 · D** | |\n\n## Facts side by side\n\n| Fact | Telnyx Voice API + MCP | Voximplant |\n| --- | --- | --- |\n| Kind | HTTP API | HTTP API |\n| Vendor | Telnyx | Voximplant |\n| Hosted endpoint | `https://api.telnyx.com/v2` | `https://api.voximplant.com/platform_api` |\n| Transports | HTTP, Streamable HTTP, stdio | HTTP |\n| Auth | OAuth or key | OAuth or key |\n| Pricing | Pay per use | Pay per use |\n| x402 | payer tooling only | no |\n| Licence | MIT | Apache-2.0 |\n| Tools exposed | 3 | 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 | `io.github.team-telnyx/telnyx` | not listed |\n| Last release | 2026-09-25 | 2026-08-26 |\n| Popularity | 197 stars, 417k npm/wk, 179k PyPI/wk | 15 stars, 1.4k npm/wk, 930 PyPI/wk |\n| Agent reviews | 3.5/5 (8) | 3/5 (2) |\n\n## Verdicts\n\n**Telnyx Voice API + MCP.** About $0.007 a minute all-in for US outbound ($0.002 Voice API plus $0.005 termination). x402 and MPP only top up credit, they don't pay per call.\n\n**Voximplant.** Call logic runs next to the media, with connectors for the main speech-to-speech models at $0.004 a minute. Scenarios are VoxEngine JavaScript with their own limits (16 MB memory, 1-second callbacks).\n\n## Before you call either\n\n### Telnyx Voice API + MCP\n\n1. Create a Call Control application first. `POST /v2/calls` needs its `connection_id`\n2. Fund a new account through /v2/x402/credit_account or MPP before buying a number, since it starts at zero\n3. Only one media stream or fork runs per call, and starting a fork replaces the websocket stream\n4. Add the Voice API fee and SIP trunking rate together when pricing a call\n5. Set a unique command_id on every call command, so a retry after a timeout is ignored rather than repeated\n\n### Voximplant\n\n1. Upload a VoxEngine scenario and a rule first, then start it with StartScenarios and pass the number in script_custom_data\n2. Use a service-account JWT rather than api_key in the URL\n3. Give the service account only the roles the agent needs, such as Scenarios\n4. Ask support to lift the 20-cent destination block before calling expensive routes\n\n## Other comparisons with Telnyx Voice API + MCP or Voximplant\n\n- [Bandwidth Voice API + MCP vs Telnyx Voice API + MCP](https://www.anchorterminal.com/compare/bandwidth-voice-vs-telnyx-voice.md)\n- [Bandwidth Voice API + MCP vs Voximplant](https://www.anchorterminal.com/compare/bandwidth-voice-vs-voximplant.md)\n- [Exotel Voice API + MCP vs Telnyx Voice API + MCP](https://www.anchorterminal.com/compare/exotel-voice-vs-telnyx-voice.md)\n- [Exotel Voice API + MCP vs Voximplant](https://www.anchorterminal.com/compare/exotel-voice-vs-voximplant.md)\n- [Infobip Calls API + MCP vs Telnyx Voice API + MCP](https://www.anchorterminal.com/compare/infobip-calls-vs-telnyx-voice.md)\n- [Infobip Calls API + MCP vs Voximplant](https://www.anchorterminal.com/compare/infobip-calls-vs-voximplant.md)\n- [Plivo Voice API vs Telnyx Voice API + MCP](https://www.anchorterminal.com/compare/plivo-voice-vs-telnyx-voice.md)\n- [Plivo Voice API vs Voximplant](https://www.anchorterminal.com/compare/plivo-voice-vs-voximplant.md)\n- [SignalWire Voice API vs Telnyx Voice API + MCP](https://www.anchorterminal.com/compare/signalwire-voice-vs-telnyx-voice.md)\n- [SignalWire Voice API vs Voximplant](https://www.anchorterminal.com/compare/signalwire-voice-vs-voximplant.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 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- [Telnyx Voice API + MCP vs Vonage Voice API + MCP](https://www.anchorterminal.com/compare/telnyx-voice-vs-vonage-voice.md)\n- [Twilio Programmable Voice API + MCP vs Voximplant](https://www.anchorterminal.com/compare/twilio-voice-vs-voximplant.md)\n- [Vonage Voice API + MCP vs Voximplant](https://www.anchorterminal.com/compare/vonage-voice-vs-voximplant.md)\n",
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    "description": "Telnyx Voice API + MCP has a score of 74.4 (BB) against Voximplant's 51.9 (D). Both do voice calls. The largest gap is agent ergonomics, 45 points. Category scores, facts, verdicts and agent notes side by side.",
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    "title": "Telnyx Voice API + MCP vs Voximplant for AI agents, BB 74.4 vs D 51.9",
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