{ "data": { "a": { "slug": "bandwidth-voice", "name": "Bandwidth Voice API + MCP", "vendor": "Bandwidth", "vendorUrl": "https://www.bandwidth.com", "kind": "http-api", "category": "voice-calling", "summary": "Programmable voice on Bandwidth's own US carrier network, with BXML call control, bidirectional WebSocket media streams, recording, transcription and transfers.", "url": "https://www.anchorterminal.com/tools/bandwidth-voice", "markdownUrl": "https://www.anchorterminal.com/tools/bandwidth-voice.md", "slimMarkdownUrl": "https://www.anchorterminal.com/tools/bandwidth-voice.min.md", "jsonUrl": "https://www.anchorterminal.com/api/v1/tools/bandwidth-voice.json", "repo": "https://github.com/Bandwidth/mcp-server", "transports": [ "http", "stdio", "streamable-http" ], "remoteUrl": "https://voice.bandwidth.com/api/v2", "packages": [ { "registry": "npm", "name": "bandwidth-sdk" }, { "registry": "pypi", "name": "bandwidth-sdk" } ], "auth": "oauth", "authNotes": "OAuth 2.0 client credentials. Exchange the client ID and secret at api.bandwidth.com/api/v1/oauth2/token for a Bearer token. Legacy Basic-auth API users are being migrated. The MCP server takes BW_CLIENT_ID and BW_CLIENT_SECRET.", "pricing": "usage", "pricingNotes": "Free Build trial with 3,000 credits, a US number and no card, then pay as you go. US local outbound $0.01 and inbound $0.0055 a minute. Recording $0.002 a minute, transcription $0.045 standard or $0.0451 real time, media streaming $0.0035 one-way or $0.004 bidirectional. Number rental and SIP trunking are quoted by sales (https://www.bandwidth.com/pricing/).", "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": 2, "npmWeekly": 12740, "pypiWeekly": 39218, "asOf": "2026-09-30" }, "docsUrl": "https://dev.bandwidth.com/docs/voice", "llmsTxt": "https://dev.bandwidth.com/llms.txt", "openapi": "https://dev.bandwidth.com/spec/voice.yml", "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" ], "lastRelease": "2026-09-22", "graded": true, "anchor": { "graded": true, "score": 63.7, "grade": "B", "agentReady": false, "rank": 196, "ranked": true, "rankOf": 452, "categoryRank": 4, "methodology": "0.3", "run": "2026-10-01", "scores": { "ergonomics": 65, "maintenance": 78, "payments": 35, "reliability": 58, "schema": 88, "security": 60, "transparency": 63 }, "pending": [ "performance", "tasks" ], "assessment": { "confidence": "medium", "date": "2026-10-01" }, "negative": 0, "verdict": "5 calls a second and 100 active sessions by default, with excess calls queued. Number rental and SIP trunking prices aren't published.", "strengths": [ "5 calls a second and 100 active sessions by default, with excess calls queued", "No-card Build trial with 3,000 credits, a US number and SIP trunking", "OAuth 2.0 client credentials with 1-hour tokens, per-credential roles and secret rotation", "OpenAPI spec and llms.txt with Markdown pages", "Per-call debug logs with API request history and webhook delivery attempts" ], "weaknesses": [ "Number rental and SIP trunking prices aren't published", "No bug bounty, security.txt or callback signing found", "LAX and JFK datacentre incidents hit voice for about 7 and 5 hours in August", "No Retry-After or backoff guidance on 429", "MCP server is beta, installed by git clone, with no licence file" ], "agentNotes": [ "Get a token from the OAuth endpoint first, then POST to /accounts/{accountId}/calls with an applicationId and answerUrl", "Keep the call alive with Pause or a redirect while a bidirectional stream runs, or it hangs up when BXML runs out", "Read the 429 message to tell a rate limit from a concurrency limit before retrying", "Load the MCP server with BW_MCP_PROFILE=voice to keep the tool list short" ], "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": 63.7 } ], "editorialScores": { "ergonomics": 65, "maintenance": 78, "payments": 35, "reliability": 58, "schema": 88, "security": 60, "transparency": 35 }, "provenanceScore": 90 }, "connect": { "http": "curl -X POST \"https://voice.bandwidth.com/api/v2/accounts/$BW_ACCOUNT_ID/calls\" -H \"Authorization: Bearer $BW_ACCESS_TOKEN\" \\\n -H \"Content-Type: application/json\" -d '{\"to\":\"+15555550123\",\"from\":\"+15555550100\",\"applicationId\":\"'$BW_VOICE_APPLICATION_ID'\",\"answerUrl\":\"https://example.com/answer\"}'", "config": { "mcpServers": { "bandwidth": { "args": [ "--from", "/path/to/mcp-server", "start" ], "command": "uvx", "env": { "BW_ACCOUNT_ID": "${BW_ACCOUNT_ID}", "BW_CLIENT_ID": "${BW_CLIENT_ID}", "BW_CLIENT_SECRET": "${BW_CLIENT_SECRET}", "BW_MCP_PROFILE": "voice" } } } } }, "letme": { "capability": "https://letme.dev/voice.calls", "tool": "https://letme.dev/bandwidth-voice" }, "sameCompany": [ "bandwidth" ], "area": "voice", "unitPrices": [ { "item": "US outbound, local", "unit": "call-minute", "usd": 0.01, "note": "outbound to US local numbers" }, { "item": "US inbound, local", "unit": "call-minute", "usd": 0.0055, "note": "inbound on a US local number" }, { "item": "Media streaming, bidirectional", "unit": "call-minute", "usd": 0.004, "note": "per streamed minute" }, { "item": "Media streaming, one-way", "unit": "call-minute", "usd": 0.0035, "note": "per streamed minute" }, { "item": "Recording", "unit": "call-minute", "usd": 0.002, "note": "per recorded minute" } ], "provenance": { "legalEntity": "Bandwidth Inc.", "domain": "bandwidth.com", "domainRegistered": "1995-02-20", "endpointOnVendorDomain": true, "terms": "https://www.bandwidth.com/legal/communications-services-agreement/", "privacy": "https://www.bandwidth.com/legal/privacy/", "statusPage": "https://status.bandwidth.com", "changelog": "https://www.bandwidth.com/release-notes/", "securityTxt": "none", "checked": "2026-09-30", "notes": [ "Provenance shared with the Bandwidth messaging listing." ], "score": 90 }, "pageJsonUrl": "https://www.anchorterminal.com/tools/bandwidth-voice.json", "live": { "slug": "bandwidth-voice", "probe": { "target": "https://voice.bandwidth.com/api/v2", "method": "get", "lastAt": "2026-10-04T23:32:43.693853013Z", "lastOk": true, "lastStatus": 403, "lastMs": 58, "lastNote": "asks for credentials", "authRequired": true, "uptime24h": 100, "uptime30d": 100, "p50ms24h": 61, "p95ms24h": 123, "samples24h": 272, "samples30d": 1097, "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": 267, "ok": 267 } ] }, "vendorStatus": { "page": "https://status.bandwidth.com", "indicator": "maintenance", "summary": "Service Under Maintenance", "checkedAt": "2026-10-04T23:27:40.202090185Z" }, "versions": [ { "registry": "github", "name": "Bandwidth/mcp-server", "version": "v0.3.0", "released": "2026-06-11", "seenAt": "2026-10-04T16:21:51.875806743Z" }, { "registry": "npm", "name": "bandwidth-sdk", "version": "8.3.0", "seenAt": "2026-10-04T16:21:51.254649229Z" }, { "registry": "pypi", "name": "bandwidth-sdk", "version": "23.3.0", "released": "2026-09-22", "seenAt": "2026-10-04T16:21:51.689982393Z" } ], "githubStars": 2, "npmWeekly": 14503, "pypiWeekly": 35330, "securityTxt": { "url": "https://bandwidth.com/.well-known/security.txt", "state": "unknown", "checkedAt": "2026-10-04T15:16:04.580175049Z" }, "llmsTxt": { "url": "https://dev.bandwidth.com/llms.txt", "ok": true, "status": 200, "checkedAt": "2026-10-04T15:17:18.684718216Z" }, "domain": { "domain": "bandwidth.com", "registered": "1995-02-20", "source": "https://rdap.verisign.com/com/v1/domain/bandwidth.com", "checkedAt": "2026-10-04T13:08:39.296680691Z" }, "pages": [ { "url": "https://www.bandwidth.com/release-notes/", "kind": "changelog", "status": 200, "checkedAt": "2026-10-04T15:49:23.983694909Z", "changedAt": "2026-10-03T15:37:19.430596463Z", "fingerprint": "87b32035924b" }, { "url": "https://www.bandwidth.com/pricing/", "kind": "pricing", "status": 200, "checkedAt": "2026-10-04T15:49:21.980288465Z", "changedAt": "0001-01-01T00:00:00Z", "fingerprint": "b3b61701939e" }, { "url": "https://www.bandwidth.com/legal/privacy/", "kind": "privacy", "status": 200, "checkedAt": "2026-10-04T15:49:20.642543658Z", "changedAt": "0001-01-01T00:00:00Z", "fingerprint": "e0e2641969a7" }, { "url": "https://www.bandwidth.com/legal/communications-services-agreement/", "kind": "terms", "status": 200, "checkedAt": "2026-10-04T15:49:17.739941299Z", "changedAt": "2026-10-04T15:49:17.739941299Z", "fingerprint": "2b4532228e6f" } ], "updatedAt": "2026-10-04T23:32:43.693853013Z" } }, "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": "2026-10-04T23:32:55.715796706Z", "lastOk": true, "lastStatus": 200, "lastMs": 24, "authRequired": false, "uptime24h": 100, "uptime30d": 100, "p50ms24h": 27, "p95ms24h": 66, "samples24h": 272, "samples30d": 1097, "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": 267, "ok": 267 } ] }, "vendorStatus": { "page": "https://status.twilio.com", "indicator": "minor", "summary": "Partially Degraded Service", "checkedAt": "2026-10-04T23:28:04.739341048Z" }, "versions": [ { "registry": "github", "name": "twilio-labs/mcp", "version": "0.0.3", "released": "2025-03-25", "seenAt": "2026-10-04T16:42:28.341727729Z" }, { "registry": "npm", "name": "@twilio-alpha/mcp", "version": "0.7.0", "seenAt": "2026-10-04T16:42:26.54293887Z" }, { "registry": "npm", "name": "twilio", "version": "6.1.2", "seenAt": "2026-10-04T16:42:26.104679108Z" }, { "registry": "pypi", "name": "twilio", "version": "9.11.2", "released": "2026-09-28", "seenAt": "2026-10-04T16:42:26.381954279Z" } ], "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": "2026-10-04T23:32:55.715796706Z" } }, "summary": "Twilio Programmable Voice API + MCP has a score of 80.4 (A) against Bandwidth Voice API + MCP's 63.7 (B). Both do voice calls. The largest gap is reliability, 32 points." }, "kind": "anchor.page", "links": { "api": "https://www.anchorterminal.com/api/v1/index.json", "html": "https://www.anchorterminal.com/compare/bandwidth-voice-vs-twilio-voice", "json": "https://www.anchorterminal.com/compare/bandwidth-voice-vs-twilio-voice.json", "llms": "https://www.anchorterminal.com/llms.txt", "markdown": "https://www.anchorterminal.com/compare/bandwidth-voice-vs-twilio-voice.md", "slim": "https://www.anchorterminal.com/compare/bandwidth-voice-vs-twilio-voice.min.md" }, "markdown": "Twilio Programmable Voice API + MCP has a score of 80.4 (A) against Bandwidth Voice API + MCP's 63.7 (B). Both do voice calls. The largest gap is reliability, 32 points.\n\n- Bandwidth Voice API + MCP: grade B, 63.7/100, rank #196 of 452. Markdown https://www.anchorterminal.com/tools/bandwidth-voice.md · JSON https://www.anchorterminal.com/api/v1/tools/bandwidth-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 Bandwidth 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 (+32), agent ergonomics (+15), security \u0026 auth (+25), payments \u0026 pricing (+5), maintenance \u0026 community (+7), transparency \u0026 trust (+18).\n\n## Score by category\n\n| Category | Weight | Bandwidth Voice API + MCP | Twilio Programmable Voice API + MCP | Edge |\n| --- | --- | --- | --- | --- |\n| Reliability | 16% (20 this run) | 58 | 90 | Twilio Programmable Voice API + MCP +32 |\n| Performance | 10%, pending | pending | pending | not scored in this run |\n| Schema \u0026 documentation | 13% (16.2 this run) | 88 | 92 | Twilio Programmable Voice API + MCP +4 |\n| Agent ergonomics | 13% (16.2 this run) | 65 | 80 | Twilio Programmable Voice API + MCP +15 |\n| Security \u0026 auth | 14% (17.5 this run) | 60 | 85 | Twilio Programmable Voice API + MCP +25 |\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) | 78 | 85 | Twilio Programmable Voice API + MCP +7 |\n| Transparency \u0026 trust | 7% (8.8 this run) | 63 | 81 | Twilio Programmable Voice API + MCP +18 |\n| Negative events | ≤15 | 0 | 0 | |\n| **Total** | | **63.7 · B** | **80.4 · A** | |\n\n## Facts side by side\n\n| Fact | Bandwidth Voice API + MCP | Twilio Programmable Voice API + MCP |\n| --- | --- | --- |\n| Kind | HTTP API | HTTP API |\n| Vendor | Bandwidth | Twilio |\n| Hosted endpoint | `https://voice.bandwidth.com/api/v2` | `https://api.twilio.com/2010-04-01` |\n| Transports | HTTP, stdio, Streamable HTTP | HTTP, Streamable HTTP, stdio |\n| Auth | OAuth | OAuth or key |\n| Pricing | Pay per use | Pay per use |\n| x402 | no | no |\n| Licence | none | 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 | 2026-09-22 | 2026-09-28 |\n| Popularity | 2 stars, 13k npm/wk, 39k 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**Bandwidth Voice API + MCP.** 5 calls a second and 100 active sessions by default, with excess calls queued. Number rental and SIP trunking prices aren't published.\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### Bandwidth Voice API + MCP\n\n1. Get a token from the OAuth endpoint first, then POST to /accounts/{accountId}/calls with an applicationId and answerUrl\n2. Keep the call alive with Pause or a redirect while a bidirectional stream runs, or it hangs up when BXML runs out\n3. Read the 429 message to tell a rate limit from a concurrency limit before retrying\n4. Load the MCP server with BW_MCP_PROFILE=voice to keep the tool list short\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 Bandwidth Voice API + MCP or Twilio Programmable Voice API + MCP\n\n- [Bandwidth Voice API + MCP vs Exotel Voice API + MCP](https://www.anchorterminal.com/compare/bandwidth-voice-vs-exotel-voice.md)\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 Plivo Voice API](https://www.anchorterminal.com/compare/bandwidth-voice-vs-plivo-voice.md)\n- [Bandwidth Voice API + MCP vs SignalWire Voice API](https://www.anchorterminal.com/compare/bandwidth-voice-vs-signalwire-voice.md)\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 Telnyx Voice API + MCP](https://www.anchorterminal.com/compare/bandwidth-voice-vs-telnyx-voice.md)\n- [Bandwidth Voice API + MCP vs Vonage Voice API + MCP](https://www.anchorterminal.com/compare/bandwidth-voice-vs-vonage-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 Twilio Programmable Voice API + MCP](https://www.anchorterminal.com/compare/exotel-voice-vs-twilio-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 Twilio Programmable Voice API + MCP](https://www.anchorterminal.com/compare/plivo-voice-vs-twilio-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 Twilio Programmable Voice API + MCP](https://www.anchorterminal.com/compare/sinch-voice-vs-twilio-voice.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", "meta": { "attribution": "Anchor Terminal (https://www.anchorterminal.com)", "docs": "https://www.anchorterminal.com/docs/", "generatedAt": "2026-10-04", "license": "CC-BY-4.0", "method": "https://www.anchorterminal.com/benchmark/", "methodology": "0.3", "openapi": "https://www.anchorterminal.com/openapi.json", "preview": false, "run": "2026-10-01", "runLabel": "October 2026 research run" }, "page": { "breadcrumbs": [ { "name": "Home", "url": "https://www.anchorterminal.com/" }, { "name": "Compare", "url": "https://www.anchorterminal.com/compare/" }, { "name": "Bandwidth Voice API + MCP vs Twilio Programmable Voice API + MCP", "url": "" } ], "description": "Twilio Programmable Voice API + MCP has a score of 80.4 (A) against Bandwidth Voice API + MCP's 63.7 (B). Both do voice calls. The largest gap is reliability, 32 points. Category scores, facts, verdicts and agent notes side by side.", "facts": [ "Bandwidth Voice API + MCP B 63.7", "Twilio Programmable Voice API + MCP A 80.4", "scores" ], "h1": "Bandwidth Voice API + MCP vs Twilio Programmable Voice API + MCP", "image": "https://www.anchorterminal.com/assets/og/compare-bandwidth-voice-vs-twilio-voice.png", "path": "/compare/bandwidth-voice-vs-twilio-voice", "published": "2026-10-01", "section": "tools", "title": "Bandwidth Voice API + MCP vs Twilio Programmable Voice API + MCP", "toc": null, "updated": "2026-10-04", "url": "https://www.anchorterminal.com/compare/bandwidth-voice-vs-twilio-voice" }, "tokens": { "markdown": 1800, "slim": 380 }, "version": 1 }