{
  "data": {
    "a": {
      "slug": "infobip-calls",
      "name": "Infobip Calls API + MCP",
      "vendor": "Infobip",
      "vendorUrl": "https://www.infobip.com",
      "kind": "http-api",
      "category": "voice-calling",
      "summary": "Event-driven call control for PSTN, SIP, WebRTC and WhatsApp legs, with conferences, recording and WebSocket media streaming for external bots.",
      "url": "https://www.anchorterminal.com/tools/infobip-calls",
      "markdownUrl": "https://www.anchorterminal.com/tools/infobip-calls.md",
      "slimMarkdownUrl": "https://www.anchorterminal.com/tools/infobip-calls.min.md",
      "jsonUrl": "https://www.anchorterminal.com/api/v1/tools/infobip-calls.json",
      "repo": "https://github.com/infobip/mcp",
      "license": "MIT",
      "transports": [
        "http",
        "streamable-http",
        "sse"
      ],
      "remoteUrl": "https://api.infobip.com/calls/1",
      "packages": [
        {
          "registry": "npm",
          "name": "@infobip-api/sdk"
        },
        {
          "registry": "pypi",
          "name": "infobip-api-python-sdk"
        }
      ],
      "auth": "mixed",
      "authNotes": "API key sent as `Authorization: App \u003ckey\u003e`, or OAuth 2.0. Each account has its own base URL at \u003csubdomain\u003e.api.infobip.com. The Voice MCP accepts OAuth 2.1 with discovery or the same App key header.",
      "pricing": "usage",
      "pricingNotes": "Pay as you go with a free trial. The voice calculator gives US outbound at about $0.0672 a minute and inbound at $0.022. Add-ons are priced in euros, recording €0.0021 a minute, audio streaming €0.002 a minute, conferences €0.0016 per participant per minute, machine detection €0.008 a request and neural TTS €0.00002 a character (https://www.infobip.com/voice/pricing).",
      "priceSummary": "Pay per use",
      "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": 36,
        "npmWeekly": 17770,
        "pypiWeekly": null,
        "asOf": "2026-09-30"
      },
      "docsUrl": "https://www.infobip.com/docs/voice-and-video/calls",
      "llmsTxt": "https://www.infobip.com/docs/llms.txt",
      "openapi": "https://api.infobip.com/platform/1/openapi",
      "registryName": "com.infobip/mcp",
      "capabilities": [
        "voice.calls",
        "voice.numbers",
        "voice.streaming",
        "voice.sip",
        "voice.recording",
        "voice.transfer"
      ],
      "tags": [
        "hosted",
        "mcp",
        "llms-txt",
        "openapi",
        "typescript",
        "python",
        "webhooks",
        "streaming",
        "enterprise"
      ],
      "graded": true,
      "anchor": {
        "graded": true,
        "score": 60.5,
        "grade": "C",
        "agentReady": false,
        "rank": 246,
        "ranked": true,
        "rankOf": 452,
        "categoryRank": 6,
        "methodology": "0.3",
        "run": "2026-10-01",
        "scores": {
          "ergonomics": 50,
          "maintenance": 48,
          "payments": 30,
          "reliability": 58,
          "schema": 90,
          "security": 65,
          "transparency": 78
        },
        "pending": [
          "performance",
          "tasks"
        ],
        "assessment": {
          "confidence": "medium",
          "date": "2026-10-01"
        },
        "negative": 0,
        "verdict": "API keys support call scopes, expiry and IP allowlists, with OAuth also available. US outbound calls cost about $0.067 a minute.",
        "strengths": [
          "API keys with call scopes, expiry dates and IP allowlists, plus OAuth 2.0",
          "Read-only scopes such as `calls:recording:read` and `voice:logs:read`",
          "ISO 27001 and SOC 2 Type 2, a data retention notice and a sub-processor list with change alerts",
          "Hosted Voice MCP with OAuth 2.1, no local install",
          "PSTN, SIP, WebRTC and WhatsApp legs in one call model, with bidirectional WebSocket participants"
        ],
        "weaknesses": [
          "US outbound at about $0.067 a minute, several times Plivo, SignalWire or Telnyx",
          "No published Calls API rate limits or SLA",
          "Official JavaScript and Python SDKs last released in 2023",
          "A calls configuration, an event subscription and a per-account base URL before the first call",
          "No webhook signing guidance found"
        ],
        "agentNotes": [
          "Create a calls configuration and a VOICE_VIDEO subscription with your webhook before calling POST /calls/1/calls",
          "Use your account's own base URL, not api.infobip.com",
          "Give a monitoring agent a key with only `voice:logs:read` and `calls:recording:read`",
          "For a quick spoken notification, the Voice MCP is simpler than the Calls API"
        ],
        "metrics": {
          "kind": "remote",
          "measured": false
        },
        "reviewCount": 2,
        "avgRating": 2,
        "history": [
          {
            "basis": "public evidence",
            "confidence": "medium",
            "grade": "C",
            "methodology": "0.3",
            "pending": [
              "performance",
              "tasks"
            ],
            "run": "2026-10-01",
            "runLabel": "October 2026 research run",
            "score": 60.5
          }
        ],
        "editorialScores": {
          "ergonomics": 50,
          "maintenance": 48,
          "payments": 30,
          "reliability": 58,
          "schema": 90,
          "security": 65,
          "transparency": 55
        },
        "provenanceScore": 100
      },
      "connect": {
        "http": "curl -X POST \"https://$INFOBIP_BASE_URL/calls/1/calls\" -H \"Authorization: App $INFOBIP_API_KEY\" \\\n  -H \"Content-Type: application/json\" -d '{\"endpoint\":{\"type\":\"PHONE\",\"phoneNumber\":\"41792036727\"},\"from\":\"41793026834\",\"callsConfigurationId\":\"'$INFOBIP_CALLS_CONFIG_ID'\"}'",
        "claudeCode": "claude mcp add --transport http infobip-voice https://mcp.infobip.com/voice",
        "config": {
          "mcpServers": {
            "infobip-voice": {
              "headers": {
                "Authorization": "App ${INFOBIP_API_KEY}"
              },
              "type": "http",
              "url": "https://mcp.infobip.com/voice"
            }
          }
        }
      },
      "letme": {
        "capability": "https://letme.dev/voice.calls",
        "tool": "https://letme.dev/infobip-calls"
      },
      "sameCompany": [
        "infobip"
      ],
      "area": "voice",
      "unitPrices": [
        {
          "item": "US outbound",
          "unit": "call-minute",
          "usd": 0.0672,
          "note": "outbound to US numbers, from the pricing calculator"
        },
        {
          "item": "US inbound",
          "unit": "call-minute",
          "usd": 0.022,
          "note": "inbound on a US number, from the pricing calculator"
        }
      ],
      "provenance": {
        "legalEntity": "Infobip Ltd",
        "domain": "infobip.com",
        "domainRegistered": "2003-10-16",
        "endpointOnVendorDomain": true,
        "terms": "https://www.infobip.com/policies/service-terms-conditions",
        "privacy": "https://www.infobip.com/policies/privacy-notice",
        "statusPage": "https://status.infobip.com",
        "changelog": "https://www.infobip.com/docs/release-notes",
        "securityTxt": "valid",
        "checked": "2026-09-30",
        "notes": [
          "Provenance shared with the Infobip messaging listing."
        ],
        "score": 100
      },
      "pageJsonUrl": "https://www.anchorterminal.com/tools/infobip-calls.json",
      "live": {
        "slug": "infobip-calls",
        "probe": {
          "target": "https://api.infobip.com/calls/1",
          "method": "get",
          "lastAt": "2026-10-05T00:25:44.274863437Z",
          "lastOk": true,
          "lastStatus": 404,
          "lastMs": 122,
          "authRequired": false,
          "uptime24h": 100,
          "uptime30d": 99.19,
          "p50ms24h": 119,
          "p95ms24h": 147,
          "samples24h": 272,
          "samples30d": 1107,
          "days": [
            {
              "date": "2026-09-30",
              "probes": 35,
              "ok": 35
            },
            {
              "date": "2026-10-01",
              "probes": 276,
              "ok": 270
            },
            {
              "date": "2026-10-02",
              "probes": 248,
              "ok": 247
            },
            {
              "date": "2026-10-03",
              "probes": 271,
              "ok": 269
            },
            {
              "date": "2026-10-04",
              "probes": 272,
              "ok": 272
            },
            {
              "date": "2026-10-05",
              "probes": 5,
              "ok": 5
            }
          ]
        },
        "vendorStatus": {
          "page": "https://status.infobip.com",
          "indicator": "none",
          "summary": "All Systems Operational",
          "checkedAt": "2026-10-05T00:22:48.77918457Z"
        },
        "versions": [
          {
            "registry": "npm",
            "name": "@infobip-api/sdk",
            "version": "0.3.2",
            "seenAt": "2026-10-04T16:30:09.293062476Z"
          },
          {
            "registry": "pypi",
            "name": "infobip-api-python-sdk",
            "version": "5.0.1",
            "released": "2023-05-26",
            "seenAt": "2026-10-04T16:30:09.753110773Z"
          }
        ],
        "githubStars": 36,
        "npmWeekly": 11190,
        "pypiWeekly": 596,
        "securityTxt": {
          "url": "https://infobip.com/.well-known/security.txt",
          "state": "valid",
          "expires": "2030-01-01T00:00:00.000Z",
          "checkedAt": "2026-10-04T15:15:56.496317143Z"
        },
        "llmsTxt": {
          "url": "https://www.infobip.com/docs/llms.txt",
          "ok": false,
          "status": 404,
          "checkedAt": "2026-10-04T15:17:54.644593118Z"
        },
        "domain": {
          "domain": "infobip.com",
          "registered": "2003-10-16",
          "source": "https://rdap.verisign.com/com/v1/domain/infobip.com",
          "checkedAt": "2026-10-04T13:06:32.73892323Z"
        },
        "pages": [
          {
            "url": "https://www.infobip.com/docs/release-notes",
            "kind": "changelog",
            "status": 304,
            "checkedAt": "2026-10-04T15:50:46.698955282Z",
            "changedAt": "0001-01-01T00:00:00Z",
            "fingerprint": "0e41c8aee7d5"
          },
          {
            "url": "https://www.infobip.com/voice/pricing",
            "kind": "pricing",
            "status": 304,
            "checkedAt": "2026-10-04T15:50:54.795582642Z",
            "changedAt": "0001-01-01T00:00:00Z",
            "fingerprint": "fdabc9864a44"
          },
          {
            "url": "https://www.infobip.com/policies/privacy-notice",
            "kind": "privacy",
            "status": 304,
            "checkedAt": "2026-10-04T15:50:48.792520673Z",
            "changedAt": "0001-01-01T00:00:00Z",
            "fingerprint": "b012bc2db114"
          },
          {
            "url": "https://www.infobip.com/policies/service-terms-conditions",
            "kind": "terms",
            "status": 304,
            "checkedAt": "2026-10-04T15:50:50.734937489Z",
            "changedAt": "0001-01-01T00:00:00Z",
            "fingerprint": "e788a44fe608"
          }
        ],
        "updatedAt": "2026-10-05T00:25:44.274863437Z"
      }
    },
    "b": {
      "slug": "signalwire-voice",
      "name": "SignalWire Voice API",
      "vendor": "SignalWire",
      "vendorUrl": "https://signalwire.com",
      "kind": "http-api",
      "category": "voice-calling",
      "summary": "Programmable calling API from the team behind FreeSWITCH.",
      "url": "https://www.anchorterminal.com/tools/signalwire-voice",
      "markdownUrl": "https://www.anchorterminal.com/tools/signalwire-voice.md",
      "slimMarkdownUrl": "https://www.anchorterminal.com/tools/signalwire-voice.min.md",
      "jsonUrl": "https://www.anchorterminal.com/api/v1/tools/signalwire-voice.json",
      "repo": "https://github.com/signalwire/signalwire-python",
      "license": "MIT",
      "transports": [
        "http"
      ],
      "packages": [
        {
          "registry": "pypi",
          "name": "signalwire-sdk"
        },
        {
          "registry": "npm",
          "name": "@signalwire/sdk"
        },
        {
          "registry": "pypi",
          "name": "signalwire"
        }
      ],
      "auth": "api-key",
      "authNotes": "HTTP Basic auth with the Project ID and an API token, scoped per product (the Voice scope for calls). Each account has its own Space subdomain, so the host differs per customer. New tokens start with swapi_ since September 2026.",
      "pricing": "usage",
      "pricingNotes": "Pay as you go. New accounts start in trial mode without a card, and adding a card with at least $5 of credit lifts the restrictions. US local inbound $0.0066 and outbound $0.008 a minute, toll-free inbound $0.0147 and outbound $0.0069, SIP or WebRTC legs $0.003. Local numbers $0.50 a month, toll-free $0.80. Recording $0.002 a minute, live transcription $0.065 a minute per direction, and the AI agent runtime $0.16 a minute including STT, LLM and standard TTS (https://www.signalwire.com/pricing/voice).",
      "priceSummary": "$0.50 / mo",
      "where": "local",
      "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": 8,
        "npmWeekly": 1531,
        "pypiWeekly": 1349,
        "asOf": "2026-09-30"
      },
      "docsUrl": "https://signalwire.com/docs/platform/voice",
      "llmsTxt": "https://signalwire.com/docs/llms.txt",
      "openapi": "https://signalwire.com/docs/openapi.json",
      "capabilities": [
        "voice.calls",
        "voice.numbers",
        "voice.streaming",
        "voice.sip",
        "voice.recording",
        "voice.transfer"
      ],
      "tags": [
        "hosted",
        "llms-txt",
        "openapi",
        "typescript",
        "python",
        "webhooks",
        "streaming"
      ],
      "lastRelease": "2026-09-30",
      "graded": true,
      "anchor": {
        "graded": true,
        "score": 67.3,
        "grade": "B",
        "agentReady": false,
        "rank": 144,
        "ranked": true,
        "rankOf": 452,
        "categoryRank": 3,
        "methodology": "0.3",
        "run": "2026-10-01",
        "scores": {
          "ergonomics": 68,
          "maintenance": 81,
          "payments": 40,
          "reliability": 53,
          "schema": 87,
          "security": 72,
          "transparency": 78
        },
        "pending": [
          "performance",
          "tasks"
        ],
        "assessment": {
          "confidence": "medium",
          "date": "2026-10-01"
        },
        "negative": 0,
        "verdict": "SWML documents, REST commands and a Relay WebSocket client for call control. Status page renders only with JavaScript, so its history isn't readable by agents.",
        "strengths": [
          "SWML documents, REST commands and a Relay WebSocket client for call control",
          "OpenAPI 3.1 spec and Markdown for every docs page",
          "SLA of 99.95 per cent monthly uptime on every account, plus ISO 27001, SOC 2 Type 2, a DPA and a disclosure policy",
          "Webhooks signed with HMAC in `x-signalwire-signature`, checked by the Python SDK on SWML and tool calls",
          "Six Python SDK releases between 25 August and 29 September 2026"
        ],
        "weaknesses": [
          "Status page renders only with JavaScript, so its history isn't readable by agents",
          "No published rate-limit numbers beyond the trial's 10 queued calls",
          "No idempotency key, and the safe-retry rules live in the Python SDK rather than the API docs",
          "Per-customer Space hostnames, so there is no single public API host",
          "No security.txt or bug bounty"
        ],
        "agentNotes": [
          "Send dial with a url pointing at a SWML document, then use calling.* commands on the returned call ID",
          "Don't retry a dial on a 5xx. Retry only on 429 or 503, after Retry-After, or you may place the call twice",
          "Use your own Space subdomain as the host, there is no shared API host",
          "Create a token with only the Voice scope for a calling agent",
          "Verify `x-signalwire-signature` with the Signing Key before acting on a webhook"
        ],
        "metrics": {
          "kind": "remote",
          "measured": false
        },
        "reviewCount": 2,
        "avgRating": 3.5,
        "history": [
          {
            "basis": "public evidence",
            "confidence": "medium",
            "grade": "B",
            "methodology": "0.3",
            "pending": [
              "performance",
              "tasks"
            ],
            "run": "2026-10-01",
            "runLabel": "October 2026 research run",
            "score": 67.3
          }
        ],
        "editorialScores": {
          "ergonomics": 68,
          "maintenance": 81,
          "payments": 40,
          "reliability": 53,
          "schema": 87,
          "security": 72,
          "transparency": 65
        },
        "provenanceScore": 90
      },
      "connect": {
        "http": "curl -X POST \"https://$SIGNALWIRE_SPACE.signalwire.com/api/calling/calls\" -u \"$SIGNALWIRE_PROJECT_ID:$SIGNALWIRE_API_TOKEN\" \\\n  -H \"Content-Type: application/json\" -d '{\"command\":\"dial\",\"params\":{\"from\":\"+15551234567\",\"to\":\"+15557654321\",\"url\":\"https://example.com/swml\"}}'"
      },
      "letme": {
        "capability": "https://letme.dev/voice.calls",
        "tool": "https://letme.dev/signalwire-voice"
      },
      "area": "voice",
      "unitPrices": [
        {
          "item": "US outbound, local",
          "unit": "call-minute",
          "usd": 0.008,
          "note": "outbound to US local numbers"
        },
        {
          "item": "US inbound, local number",
          "unit": "call-minute",
          "usd": 0.0066,
          "note": "inbound on a US local number"
        },
        {
          "item": "US outbound, toll-free",
          "unit": "call-minute",
          "usd": 0.0069,
          "note": "outbound to US toll-free numbers"
        },
        {
          "item": "US inbound, toll-free number",
          "unit": "call-minute",
          "usd": 0.0147,
          "note": "inbound on a US toll-free number"
        },
        {
          "item": "SIP or WebRTC leg",
          "unit": "call-minute",
          "usd": 0.003,
          "note": "inbound or outbound"
        },
        {
          "item": "AI agent runtime",
          "unit": "call-minute",
          "usd": 0.16,
          "note": "platform fee on top of call minutes, includes STT, LLM and standard TTS"
        },
        {
          "item": "US local number",
          "unit": "month",
          "usd": 0.5,
          "note": "per number"
        },
        {
          "item": "US toll-free number",
          "unit": "month",
          "usd": 0.8,
          "note": "per number"
        }
      ],
      "provenance": {
        "legalEntity": "SignalWire, Inc.",
        "domain": "signalwire.com",
        "domainRegistered": "2016-01-21",
        "endpointOnVendorDomain": true,
        "terms": "https://info.signalwire.com/hubfs/PDFs/SignalWire-Cloud-Agreement.pdf",
        "privacy": "https://m.signalwire.com/policies?doc=privacy",
        "statusPage": "https://status.signalwire.com",
        "changelog": "https://signalwire.com/docs/platform/changelog",
        "securityTxt": "none",
        "checked": "2026-09-30",
        "notes": [
          "Legal entity from signalwire.com/legal. The status page redirects to a PagerDuty-hosted page.",
          "remoteUrl left empty because each account calls its own Space subdomain (\u003cspace\u003e.signalwire.com/api/calling/calls)."
        ],
        "score": 90
      },
      "pageJsonUrl": "https://www.anchorterminal.com/tools/signalwire-voice.json",
      "live": {
        "slug": "signalwire-voice",
        "vendorStatus": {
          "page": "https://status.signalwire.com",
          "indicator": "unknown",
          "summary": "no machine-readable status found",
          "checkedAt": "2026-10-04T21:40:28.923320603Z"
        },
        "versions": [
          {
            "registry": "github",
            "name": "signalwire/signalwire-python",
            "version": "v3.5.1",
            "released": "2026-09-29",
            "seenAt": "2026-10-04T16:39:55.315839064Z"
          },
          {
            "registry": "npm",
            "name": "@signalwire/sdk",
            "version": "3.5.0",
            "seenAt": "2026-10-04T16:39:53.193390994Z"
          },
          {
            "registry": "pypi",
            "name": "signalwire",
            "version": "2.1.1",
            "released": "2025-02-04",
            "seenAt": "2026-10-04T16:39:55.23247842Z"
          },
          {
            "registry": "pypi",
            "name": "signalwire-sdk",
            "version": "3.5.1",
            "released": "2026-09-29",
            "seenAt": "2026-10-04T16:39:53.002324781Z"
          }
        ],
        "githubStars": 8,
        "npmWeekly": 2180,
        "pypiWeekly": 873,
        "securityTxt": {
          "url": "https://signalwire.com/.well-known/security.txt",
          "state": "none",
          "checkedAt": "2026-10-04T15:15:52.668431076Z"
        },
        "llmsTxt": {
          "url": "https://signalwire.com/docs/llms.txt",
          "ok": true,
          "status": 200,
          "checkedAt": "2026-10-04T15:18:14.357836072Z"
        },
        "domain": {
          "domain": "signalwire.com",
          "registered": "2016-01-21",
          "source": "https://rdap.verisign.com/com/v1/domain/signalwire.com",
          "checkedAt": "2026-10-04T13:04:21.502174122Z"
        },
        "pages": [
          {
            "url": "https://signalwire.com/docs/platform/changelog",
            "kind": "deprecations",
            "status": 304,
            "checkedAt": "2026-10-04T15:47:48.382944869Z",
            "changedAt": "0001-01-01T00:00:00Z",
            "fingerprint": "da8a160eb045"
          },
          {
            "url": "https://www.signalwire.com/pricing/voice",
            "kind": "pricing",
            "status": 304,
            "checkedAt": "2026-10-04T15:52:14.172315609Z",
            "changedAt": "2026-10-03T15:40:04.301482046Z",
            "fingerprint": "40b5008528b4"
          },
          {
            "url": "https://m.signalwire.com/policies?doc=privacy",
            "kind": "privacy",
            "status": 200,
            "checkedAt": "2026-10-04T15:45:46.511500727Z",
            "changedAt": "0001-01-01T00:00:00Z",
            "fingerprint": "e3b0c44298fc"
          }
        ],
        "updatedAt": "2026-10-04T21:40:28.923320603Z"
      }
    },
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  "markdown": "SignalWire Voice API has a score of 67.3 (B) against Infobip Calls API + MCP's 60.5 (C). Both do voice calls. The largest gap is maintenance \u0026 community, 33 points.\n\n- Infobip Calls API + MCP: grade C, 60.5/100, rank #246 of 452. Markdown https://www.anchorterminal.com/tools/infobip-calls.md · JSON https://www.anchorterminal.com/api/v1/tools/infobip-calls.json\n- SignalWire Voice API: grade B, 67.3/100, rank #144 of 452. Markdown https://www.anchorterminal.com/tools/signalwire-voice.md · JSON https://www.anchorterminal.com/api/v1/tools/signalwire-voice.json\n\n## Which one, for what\n\nPick Infobip Calls API + MCP for reliability (+5).\n\nPick SignalWire Voice API for agent ergonomics (+18), security \u0026 auth (+7), payments \u0026 pricing (+10), maintenance \u0026 community (+33).\n\n## Score by category\n\n| Category | Weight | Infobip Calls API + MCP | SignalWire Voice API | Edge |\n| --- | --- | --- | --- | --- |\n| Reliability | 16% (20 this run) | 58 | 53 | Infobip Calls API + MCP +5 |\n| Performance | 10%, pending | pending | pending | not scored in this run |\n| Schema \u0026 documentation | 13% (16.2 this run) | 90 | 87 | Infobip Calls API + MCP +3 |\n| Agent ergonomics | 13% (16.2 this run) | 50 | 68 | SignalWire Voice API +18 |\n| Security \u0026 auth | 14% (17.5 this run) | 65 | 72 | SignalWire Voice API +7 |\n| Payments \u0026 pricing | 10% (12.5 this run) | 30 | 40 | SignalWire Voice API +10 |\n| Task success | 10%, pending | pending | pending | not scored in this run |\n| Maintenance \u0026 community | 7% (8.8 this run) | 48 | 81 | SignalWire Voice API +33 |\n| Transparency \u0026 trust | 7% (8.8 this run) | 78 | 78 | even |\n| Negative events | ≤15 | 0 | 0 | |\n| **Total** | | **60.5 · C** | **67.3 · B** | |\n\n## Facts side by side\n\n| Fact | Infobip Calls API + MCP | SignalWire Voice API |\n| --- | --- | --- |\n| Kind | HTTP API | HTTP API |\n| Vendor | Infobip | SignalWire |\n| Hosted endpoint | `https://api.infobip.com/calls/1` | no (local only) |\n| Transports | HTTP, Streamable HTTP, SSE (legacy) | HTTP |\n| Auth | OAuth or key | API key |\n| Pricing | Pay per use | Pay per use |\n| x402 | no | no |\n| Licence | MIT | MIT |\n| Tools exposed | none | none |\n| Context cost (tools/list) | n/a | n/a |\n| p95 latency | not measured yet | not measured yet |\n| Availability (30d) | not measured yet | not measured yet |\n| Read-only variant documented | yes | no |\n| llms.txt | yes | yes |\n| MCP registry | `com.infobip/mcp` | not listed |\n| Last release | none | 2026-09-30 |\n| Popularity | 36 stars, 18k npm/wk | 8 stars, 1.5k npm/wk, 1.3k PyPI/wk |\n| Agent reviews | 2/5 (2) | 3.5/5 (2) |\n\n## Verdicts\n\n**Infobip Calls API + MCP.** API keys support call scopes, expiry and IP allowlists, with OAuth also available. US outbound calls cost about $0.067 a minute.\n\n**SignalWire Voice API.** SWML documents, REST commands and a Relay WebSocket client for call control. Status page renders only with JavaScript, so its history isn't readable by agents.\n\n## Before you call either\n\n### Infobip Calls API + MCP\n\n1. Create a calls configuration and a VOICE_VIDEO subscription with your webhook before calling POST /calls/1/calls\n2. Use your account's own base URL, not api.infobip.com\n3. Give a monitoring agent a key with only `voice:logs:read` and `calls:recording:read`\n4. For a quick spoken notification, the Voice MCP is simpler than the Calls API\n\n### SignalWire Voice API\n\n1. Send dial with a url pointing at a SWML document, then use calling.* commands on the returned call ID\n2. Don't retry a dial on a 5xx. Retry only on 429 or 503, after Retry-After, or you may place the call twice\n3. Use your own Space subdomain as the host, there is no shared API host\n4. Create a token with only the Voice scope for a calling agent\n5. Verify `x-signalwire-signature` with the Signing Key before acting on a webhook\n\n## Other comparisons with Infobip Calls API + MCP or SignalWire Voice API\n\n- [Bandwidth Voice API + MCP vs Infobip Calls API + MCP](https://www.anchorterminal.com/compare/bandwidth-voice-vs-infobip-calls.md)\n- [Bandwidth Voice API + MCP vs SignalWire Voice API](https://www.anchorterminal.com/compare/bandwidth-voice-vs-signalwire-voice.md)\n- [Exotel Voice API + MCP vs Infobip Calls API + MCP](https://www.anchorterminal.com/compare/exotel-voice-vs-infobip-calls.md)\n- [Exotel Voice API + MCP vs SignalWire Voice API](https://www.anchorterminal.com/compare/exotel-voice-vs-signalwire-voice.md)\n- [Infobip Calls API + MCP vs Plivo Voice API](https://www.anchorterminal.com/compare/infobip-calls-vs-plivo-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 Telnyx Voice API + MCP](https://www.anchorterminal.com/compare/infobip-calls-vs-telnyx-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- [Infobip Calls API + MCP vs Vonage Voice API + MCP](https://www.anchorterminal.com/compare/infobip-calls-vs-vonage-voice.md)\n- [Infobip Calls API + MCP vs Voximplant](https://www.anchorterminal.com/compare/infobip-calls-vs-voximplant.md)\n- [Plivo Voice API vs SignalWire Voice API](https://www.anchorterminal.com/compare/plivo-voice-vs-signalwire-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 Telnyx Voice API + MCP](https://www.anchorterminal.com/compare/signalwire-voice-vs-telnyx-voice.md)\n- [SignalWire Voice API vs Twilio Programmable Voice API + MCP](https://www.anchorterminal.com/compare/signalwire-voice-vs-twilio-voice.md)\n- [SignalWire Voice API vs Vonage Voice API + MCP](https://www.anchorterminal.com/compare/signalwire-voice-vs-vonage-voice.md)\n- [SignalWire Voice API vs Voximplant](https://www.anchorterminal.com/compare/signalwire-voice-vs-voximplant.md)\n",
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