{ "data": { "a": { "slug": "plivo-voice", "name": "Plivo Voice API", "vendor": "Plivo", "vendorUrl": "https://www.plivo.com", "kind": "http-api", "category": "voice-calling", "summary": "REST and XML call control for inbound and outbound PSTN calls, with bidirectional WebSocket audio streams, SIP trunking, recording and conferencing.", "url": "https://www.anchorterminal.com/tools/plivo-voice", "markdownUrl": "https://www.anchorterminal.com/tools/plivo-voice.md", "slimMarkdownUrl": "https://www.anchorterminal.com/tools/plivo-voice.min.md", "jsonUrl": "https://www.anchorterminal.com/api/v1/tools/plivo-voice.json", "repo": "https://github.com/plivo/plivo-node", "license": "MIT", "transports": [ "http" ], "remoteUrl": "https://api.plivo.com/v1", "packages": [ { "registry": "npm", "name": "plivo" }, { "registry": "pypi", "name": "plivo" } ], "auth": "api-key", "authNotes": "HTTP Basic auth with Auth ID and Auth Token. The Auth ID also appears in every request path. Webhooks carry a signature you can validate.", "pricing": "usage", "pricingNotes": "Pay as you go with $10 of trial credit and no card. US outbound $0.0115 a minute to local numbers and $0.006 to toll-free, inbound $0.0055 on local and $0.018 on toll-free numbers, SIP or browser legs $0.0033. Local numbers $0.50 a month, toll-free $1. Recording is free with 90 days of storage, then $0.0004 a minute. Transcription $0.0095 a minute, machine detection and conferencing free (https://www.plivo.com/voice/pricing/us/).", "priceSummary": "$0.50 / 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": 102, "npmWeekly": 50920, "pypiWeekly": 69307, "asOf": "2026-09-30" }, "docsUrl": "https://plivo.com/docs/voice", "llmsTxt": "https://www.plivo.com/docs/llms.txt", "capabilities": [ "voice.calls", "voice.numbers", "voice.streaming", "voice.sip", "voice.recording", "voice.transfer" ], "tags": [ "hosted", "no-card", "llms-txt", "typescript", "python", "webhooks", "streaming" ], "lastRelease": "2026-09-25", "graded": true, "anchor": { "graded": true, "score": 60.4, "grade": "C", "agentReady": false, "rank": 248, "ranked": true, "rankOf": 452, "categoryRank": 7, "methodology": "0.3", "run": "2026-10-01", "scores": { "ergonomics": 70, "maintenance": 78, "payments": 40, "reliability": 68, "schema": 59, "security": 45, "transparency": 70 }, "pending": [ "performance", "tasks" ], "assessment": { "confidence": "medium", "date": "2026-10-01" }, "negative": 0, "verdict": "US outbound at $0.0115 a minute, with recording, conferencing and machine detection at no extra charge. 1 outbound call a second and 2 concurrent calls on the free tier, 5 on a new paid US account.", "strengths": [ "US outbound at $0.0115 a minute, with recording, conferencing and machine detection at no extra charge", "Bidirectional audio streams in linear PCM at 8, 16 or 24 kHz or mu-law at 8 kHz", "Published limits per plan, including concurrency and what happens above them", "$10 trial credit with no card", "SOC 2, PCI DSS Level 1 and HIPAA per the security page" ], "weaknesses": [ "1 outbound call a second and 2 concurrent calls on the free tier, 5 on a new paid US account", "No OpenAPI spec, availability SLA or DPA found", "No MCP server that can place calls, the official one searches docs only", "Call status webhooks failed for a subset of calls for about 6.5 hours on 25 August", "No scoped keys, security.txt or bug bounty" ], "agentNotes": [ "Point the answer URL at XML with a Stream element and bidirectional set to true for a live voice agent", "Check concurrency before dialling out in bulk. Above it calls are rejected with hangup cause 5030, above CPS they queue", "Don't rely on the status callback alone to learn a call ended. Poll the call if the webhook doesn't arrive", "Validate webhook signatures before acting on call events" ], "metrics": { "kind": "remote", "measured": false }, "reviewCount": 2, "avgRating": 3.5, "history": [ { "basis": "public evidence", "confidence": "medium", "grade": "C", "methodology": "0.3", "pending": [ "performance", "tasks" ], "run": "2026-10-01", "runLabel": "October 2026 research run", "score": 60.4 } ], "editorialScores": { "ergonomics": 70, "maintenance": 78, "payments": 40, "reliability": 68, "schema": 59, "security": 45, "transparency": 50 }, "provenanceScore": 90 }, "connect": { "http": "curl -X POST \"https://api.plivo.com/v1/Account/$PLIVO_AUTH_ID/Call/\" -u \"$PLIVO_AUTH_ID:$PLIVO_AUTH_TOKEN\" \\\n -H \"Content-Type: application/json\" -d '{\"from\":\"+14155550100\",\"to\":\"+14155550101\",\"answer_url\":\"https://example.com/answer.xml\",\"answer_method\":\"GET\"}'" }, "letme": { "capability": "https://letme.dev/voice.calls", "tool": "https://letme.dev/plivo-voice" }, "sameCompany": [ "plivo" ], "area": "voice", "unitPrices": [ { "item": "US outbound, local", "unit": "call-minute", "usd": 0.0115, "note": "outbound to US local numbers" }, { "item": "US outbound, toll-free", "unit": "call-minute", "usd": 0.006, "note": "outbound to US toll-free numbers" }, { "item": "US inbound, local number", "unit": "call-minute", "usd": 0.0055, "note": "inbound on a US local number" }, { "item": "US inbound, toll-free number", "unit": "call-minute", "usd": 0.018, "note": "inbound on a US toll-free number" }, { "item": "SIP or browser leg", "unit": "call-minute", "usd": 0.0033, "note": "inbound or outbound" }, { "item": "US local number", "unit": "month", "usd": 0.5, "note": "per number" }, { "item": "US toll-free number", "unit": "month", "usd": 1, "note": "per number" } ], "provenance": { "legalEntity": "Plivo Inc.", "domain": "plivo.com", "domainRegistered": "2011-04-17", "endpointOnVendorDomain": true, "terms": "https://www.plivo.com/legal/tos/", "privacy": "https://www.plivo.com/legal/privacy/", "statusPage": "https://status.plivo.com", "changelog": "https://www.plivo.com/changelog/", "securityTxt": "none", "checked": "2026-09-30", "notes": [ "Provenance shared with the Plivo messaging listing. Legal entity taken from the site footer." ], "score": 90 }, "pageJsonUrl": "https://www.anchorterminal.com/tools/plivo-voice.json", "live": { "slug": "plivo-voice", "probe": { "target": "https://api.plivo.com/v1", "method": "get", "lastAt": "2026-10-05T00:25:48.261627977Z", "lastOk": true, "lastStatus": 404, "lastMs": 325, "authRequired": false, "uptime24h": 100, "uptime30d": 100, "p50ms24h": 330, "p95ms24h": 392, "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.plivo.com", "indicator": "none", "summary": "All Systems Operational", "checkedAt": "2026-10-05T00:22:57.825348464Z" }, "versions": [ { "registry": "github", "name": "plivo/plivo-node", "version": "v4.79.0", "released": "2026-07-28", "seenAt": "2026-10-04T16:37:02.932876885Z" }, { "registry": "npm", "name": "plivo", "version": "4.79.0", "seenAt": "2026-10-04T16:37:02.343552611Z" }, { "registry": "pypi", "name": "plivo", "version": "4.63.0", "released": "2026-09-25", "seenAt": "2026-10-04T16:37:02.742133321Z" } ], "githubStars": 102, "npmWeekly": 54280, "pypiWeekly": 76309, "securityTxt": { "url": "https://plivo.com/.well-known/security.txt", "state": "none", "checkedAt": "2026-10-04T15:15:48.932052901Z" }, "llmsTxt": { "url": "https://www.plivo.com/docs/llms.txt", "ok": true, "status": 200, "checkedAt": "2026-10-04T15:18:08.052494644Z" }, "domain": { "domain": "plivo.com", "registered": "2011-04-17", "source": "https://rdap.verisign.com/com/v1/domain/plivo.com", "checkedAt": "2026-10-04T13:07:46.742269573Z" }, "pages": [ { "url": "https://www.plivo.com/changelog/", "kind": "changelog", "status": 200, "checkedAt": "2026-10-04T15:51:43.585881332Z", "changedAt": "0001-01-01T00:00:00Z", "fingerprint": "1fc13e7b957e" }, { "url": "https://www.plivo.com/voice/pricing/us/", "kind": "pricing", "status": 200, "checkedAt": "2026-10-04T15:51:51.724997892Z", "changedAt": "0001-01-01T00:00:00Z", "fingerprint": "d0eca0fa3c87" }, { "url": "https://www.plivo.com/legal/privacy/", "kind": "privacy", "status": 200, "checkedAt": "2026-10-04T15:51:46.52507636Z", "changedAt": "0001-01-01T00:00:00Z", "fingerprint": "7cd64079a8cf" }, { "url": "https://www.plivo.com/legal/tos/", "kind": "terms", "status": 200, "checkedAt": "2026-10-04T15:51:47.691771662Z", "changedAt": "0001-01-01T00:00:00Z", "fingerprint": "eaee9886500f" } ], "updatedAt": "2026-10-05T00:25:48.261627977Z" } }, "b": { "slug": "vonage-voice", "name": "Vonage Voice API + MCP", "vendor": "Vonage (Ericsson)", "vendorUrl": "https://www.vonage.com", "kind": "http-api", "category": "voice-calling", "summary": "Voice API that controls calls with NCCO, a JSON list of actions such as talk, input, record, connect and transfer.", "url": "https://www.anchorterminal.com/tools/vonage-voice", "markdownUrl": "https://www.anchorterminal.com/tools/vonage-voice.md", "slimMarkdownUrl": "https://www.anchorterminal.com/tools/vonage-voice.min.md", "jsonUrl": "https://www.anchorterminal.com/api/v1/tools/vonage-voice.json", "transports": [ "http", "stdio", "streamable-http" ], "remoteUrl": "https://api.nexmo.com/v1", "packages": [ { "registry": "npm", "name": "@vonage/server-sdk" }, { "registry": "pypi", "name": "vonage" }, { "registry": "npm", "name": "@vonage/vonage-mcp-server-api-bindings" } ], "auth": "mixed", "authNotes": "The Voice API takes a Vonage Application JWT signed RS256 with the application's private key. Signed webhooks carry an HS256 JWT to verify with the signature secret. The MCP server reads the API key, secret, application ID and a base64 private key from env vars.", "pricing": "usage", "pricingNotes": "Pay as you go, billed per second. US outbound $0.01446 a minute, inbound $0.00495 on local numbers and $0.0154 on toll-free. Calls to or from SIP, in-app (WebRTC) and websocket endpoints $0.00492 a minute. US numbers €1.81 a month. New accounts get test credit with no card. Rates are from Vonage's downloadable pricing sheet, since the pricing page blocks automated requests (https://www.vonage.com/communications-apis/voice/pricing/).", "priceSummary": "Pay per use", "where": "both", "x402": { "level": "no", "evidence": "No x402 support in docs, pricing or MCP README (checked 2026-09-30).", "endpoints": [] }, "toolCount": 14, "popularity": { "githubStars": null, "npmWeekly": 154249, "pypiWeekly": 67062, "asOf": "2026-09-30" }, "docsUrl": "https://developer.vonage.com/en/voice/voice-api/overview", "llmsTxt": "https://developer.vonage.com/llms.txt", "openapi": "https://developer.vonage.com/api/v1/developer/api/file/voice?format=json", "registryName": "io.github.Vonage/vonage-documentation-mcp", "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": "2026-09-16", "graded": true, "anchor": { "graded": true, "score": 59.1, "grade": "C", "agentReady": false, "rank": 270, "ranked": true, "rankOf": 452, "categoryRank": 8, "methodology": "0.3", "run": "2026-10-01", "scores": { "ergonomics": 60, "maintenance": 78, "payments": 35, "reliability": 45, "schema": 88, "security": 60, "transparency": 50 }, "pending": [ "performance", "tasks" ], "assessment": { "confidence": "low", "date": "2026-10-01" }, "negative": 0, "verdict": "Websocket audio as 16-bit linear PCM at 8, 16 or 24 kHz, both directions. First call needs an application, a private key and a signed JWT.", "strengths": [ "Websocket audio as 16-bit linear PCM at 8, 16 or 24 kHz, both directions", "Per-second billing on every call", "Short-lived application JWTs whose ACLs can limit a token to named paths and methods, and signed webhooks with a body hash", "OpenAPI spec and an llms.txt that tells agents which hosts to use", "€2 test credit without a card" ], "weaknesses": [ "First call needs an application, a private key and a signed JWT", "No Voice API rate limit or SLA found, and the error catalogue's throttling advice is to wait an amount that differs per API", "Pricing page returns 403 to automated requests, rates live in a spreadsheet", "MCP server has no tools for live call control, only a one-way voice message", "No security.txt, and the API runs on the legacy nexmo.com domain" ], "agentNotes": [ "Generate a short-lived JWT with an ACL limited to the call paths the agent needs, and keep the private key out of prompts", "Use a `connect` action with a websocket endpoint and `audio/l16;rate=16000` for speech models", "Keep the api.nexmo.com hostname, Vonage's llms.txt says not to swap it", "Enable signed webhooks and verify the HS256 JWT on each event", "Expect RFC 7807 errors (`type`, `title`, `detail`, `instance`) and back off on a throttling error, since no Voice rate limit is published" ], "metrics": { "kind": "remote", "measured": false }, "reviewCount": 2, "avgRating": 2.5, "history": [ { "basis": "public evidence", "confidence": "low", "grade": "C", "methodology": "0.3", "pending": [ "performance", "tasks" ], "run": "2026-10-01", "runLabel": "October 2026 research run", "score": 59.1 } ], "editorialScores": { "ergonomics": 60, "maintenance": 78, "payments": 35, "reliability": 45, "schema": 88, "security": 60, "transparency": 25 }, "provenanceScore": 75 }, "connect": { "http": "curl -X POST https://api.nexmo.com/v1/calls -H \"Authorization: Bearer $VONAGE_JWT\" \\\n -H \"Content-Type: application/json\" \\\n -d '{\"to\":[{\"type\":\"phone\",\"number\":\"14155550100\"}],\"from\":{\"type\":\"phone\",\"number\":\"14155550101\"},\"ncco\":[{\"action\":\"talk\",\"text\":\"Hello from Vonage\"}]}'", "claudeCode": "claude mcp add --transport http vonage-docs https://documentation-mcp.vonage.dev/mcp", "config": { "mcpServers": { "vonage": { "args": [ "-y", "@vonage/vonage-mcp-server-api-bindings" ], "command": "npx", "env": { "VONAGE_API_KEY": "${VONAGE_API_KEY}", "VONAGE_API_SECRET": "${VONAGE_API_SECRET}", "VONAGE_APPLICATION_ID": "${VONAGE_APPLICATION_ID}", "VONAGE_PRIVATE_KEY64": "${VONAGE_PRIVATE_KEY64}", "VONAGE_VIRTUAL_NUMBER": "${VONAGE_VIRTUAL_NUMBER}" } } } } }, "letme": { "capability": "https://letme.dev/voice.calls", "tool": "https://letme.dev/vonage-voice" }, "sameCompany": [ "vonage" ], "area": "voice", "unitPrices": [ { "item": "Outbound call, US", "unit": "call-minute", "usd": 0.01446, "note": "billed per second" }, { "item": "Inbound call, US local number", "unit": "call-minute", "usd": 0.00495, "note": "billed per second" }, { "item": "Inbound call, US toll-free number", "unit": "call-minute", "usd": 0.0154 }, { "item": "Websocket, SIP or in-app leg", "unit": "call-minute", "usd": 0.00492 } ], "provenance": { "legalEntity": "Vonage Holdings Corp.", "domain": "vonage.com", "domainRegistered": "2000-12-12", "domainNote": "The API endpoints sit on the legacy nexmo.com domain, from Nexmo's acquisition in 2016.", "endpointOnVendorDomain": false, "terms": "https://www.vonage.com/legal/communications-apis/terms-of-use/", "privacy": "https://www.vonage.com/legal/privacy-policy/", "statusPage": "https://vonageapi.statuspage.io", "changelog": "https://developer.vonage.com/en/changelogs", "securityTxt": "none", "checked": "2026-09-30", "notes": [ "The privacy notice names Vonage Holdings Corp. as controller where one entity applies. The API terms set the contracting entity by customer region in Schedule 1, which we couldn't read because vonage.com returned 403 to automated requests." ], "score": 75 }, "pageJsonUrl": "https://www.anchorterminal.com/tools/vonage-voice.json", "live": { "slug": "vonage-voice", "probe": { "target": "https://api.nexmo.com/v1", "method": "get", "lastAt": "2026-10-05T00:25:52.167202594Z", "lastOk": true, "lastStatus": 404, "lastMs": 48, "authRequired": false, "uptime24h": 100, "uptime30d": 100, "p50ms24h": 56, "p95ms24h": 89, "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://vonageapi.statuspage.io", "indicator": "minor", "summary": "Partially Degraded Service", "checkedAt": "2026-10-05T00:23:03.780768253Z" }, "versions": [ { "registry": "npm", "name": "@vonage/server-sdk", "version": "3.30.1", "seenAt": "2026-10-04T16:43:40.029661946Z" }, { "registry": "npm", "name": "@vonage/vonage-mcp-server-api-bindings", "version": "1.5.1", "seenAt": "2026-10-04T16:43:42.417836886Z" }, { "registry": "pypi", "name": "vonage", "version": "4.9.0", "released": "2026-09-16", "seenAt": "2026-10-04T16:43:42.228896026Z" } ], "npmWeekly": 152256, "pypiWeekly": 69501, "securityTxt": { "url": "https://vonage.com/.well-known/security.txt", "state": "none", "checkedAt": "2026-10-04T15:15:53.518357179Z" }, "llmsTxt": { "url": "https://developer.vonage.com/llms.txt", "ok": true, "status": 200, "checkedAt": "2026-10-04T15:18:21.395540221Z" }, "domain": { "domain": "vonage.com", "registered": "2000-12-12", "source": "https://rdap.verisign.com/com/v1/domain/vonage.com", "checkedAt": "2026-10-04T13:04:15.703583171Z" }, "pages": [ { "url": "https://developer.vonage.com/en/changelogs", "kind": "changelog", "status": 200, "checkedAt": "2026-10-04T15:42:39.187027625Z", "changedAt": "2026-10-02T15:19:02.626368872Z", "fingerprint": "81bb42dd9db6" }, { "url": "https://www.vonage.com/communications-apis/voice/pricing/", "kind": "pricing", "status": 304, "checkedAt": "2026-10-04T15:52:50.243045792Z", "changedAt": "0001-01-01T00:00:00Z", "fingerprint": "efeb31a58cfc" }, { "url": "https://www.vonage.com/legal/privacy-policy/", "kind": "privacy", "status": 304, "checkedAt": "2026-10-04T15:52:54.218403359Z", "changedAt": "0001-01-01T00:00:00Z", "fingerprint": "ef11a28348cd" }, { "url": "https://www.vonage.com/legal/communications-apis/terms-of-use/", "kind": "terms", "status": 304, "checkedAt": "2026-10-04T15:52:52.203108406Z", "changedAt": "0001-01-01T00:00:00Z", "fingerprint": "004c80c35ffa" } ], "updatedAt": "2026-10-05T00:25:52.167202594Z" } }, "summary": "Plivo Voice API has a score of 60.4 (C) against Vonage Voice API + MCP's 59.1 (C). Both do voice calls. The largest gap is schema \u0026 documentation, 29 points." }, "kind": "anchor.page", "links": { "api": "https://www.anchorterminal.com/api/v1/index.json", "html": "https://www.anchorterminal.com/compare/plivo-voice-vs-vonage-voice", "json": "https://www.anchorterminal.com/compare/plivo-voice-vs-vonage-voice.json", "llms": "https://www.anchorterminal.com/llms.txt", "markdown": "https://www.anchorterminal.com/compare/plivo-voice-vs-vonage-voice.md", "slim": "https://www.anchorterminal.com/compare/plivo-voice-vs-vonage-voice.min.md" }, "markdown": "Plivo Voice API has a score of 60.4 (C) against Vonage Voice API + MCP's 59.1 (C). Both do voice calls. The largest gap is schema \u0026 documentation, 29 points.\n\n- Plivo Voice API: grade C, 60.4/100, rank #248 of 452. Markdown https://www.anchorterminal.com/tools/plivo-voice.md · JSON https://www.anchorterminal.com/api/v1/tools/plivo-voice.json\n- Vonage Voice API + MCP: grade C, 59.1/100, rank #270 of 452. Markdown https://www.anchorterminal.com/tools/vonage-voice.md · JSON https://www.anchorterminal.com/api/v1/tools/vonage-voice.json\n\n## Which one, for what\n\nPick Plivo Voice API for reliability (+23), agent ergonomics (+10), payments \u0026 pricing (+5), transparency \u0026 trust (+20).\n\nPick Vonage Voice API + MCP for schema \u0026 documentation (+29), security \u0026 auth (+15).\n\n## Score by category\n\n| Category | Weight | Plivo Voice API | Vonage Voice API + MCP | Edge |\n| --- | --- | --- | --- | --- |\n| Reliability | 16% (20 this run) | 68 | 45 | Plivo Voice API +23 |\n| Performance | 10%, pending | pending | pending | not scored in this run |\n| Schema \u0026 documentation | 13% (16.2 this run) | 59 | 88 | Vonage Voice API + MCP +29 |\n| Agent ergonomics | 13% (16.2 this run) | 70 | 60 | Plivo Voice API +10 |\n| Security \u0026 auth | 14% (17.5 this run) | 45 | 60 | Vonage Voice API + MCP +15 |\n| Payments \u0026 pricing | 10% (12.5 this run) | 40 | 35 | Plivo Voice API +5 |\n| Task success | 10%, pending | pending | pending | not scored in this run |\n| Maintenance \u0026 community | 7% (8.8 this run) | 78 | 78 | even |\n| Transparency \u0026 trust | 7% (8.8 this run) | 70 | 50 | Plivo Voice API +20 |\n| Negative events | ≤15 | 0 | 0 | |\n| **Total** | | **60.4 · C** | **59.1 · C** | |\n\n## Facts side by side\n\n| Fact | Plivo Voice API | Vonage Voice API + MCP |\n| --- | --- | --- |\n| Kind | HTTP API | HTTP API |\n| Vendor | Plivo | Vonage (Ericsson) |\n| Hosted endpoint | `https://api.plivo.com/v1` | `https://api.nexmo.com/v1` |\n| Transports | HTTP | HTTP, stdio, Streamable HTTP |\n| Auth | API key | OAuth or key |\n| Pricing | Pay per use | Pay per use |\n| x402 | no | no |\n| Licence | MIT | none |\n| Tools exposed | none | 14 |\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 | `io.github.Vonage/vonage-documentation-mcp` |\n| Last release | 2026-09-25 | 2026-09-16 |\n| Popularity | 102 stars, 51k npm/wk, 69k PyPI/wk | 154k npm/wk, 67k PyPI/wk |\n| Agent reviews | 3.5/5 (2) | 2.5/5 (2) |\n\n## Verdicts\n\n**Plivo Voice API.** US outbound at $0.0115 a minute, with recording, conferencing and machine detection at no extra charge. 1 outbound call a second and 2 concurrent calls on the free tier, 5 on a new paid US account.\n\n**Vonage Voice API + MCP.** Websocket audio as 16-bit linear PCM at 8, 16 or 24 kHz, both directions. First call needs an application, a private key and a signed JWT.\n\n## Before you call either\n\n### Plivo Voice API\n\n1. Point the answer URL at XML with a Stream element and bidirectional set to true for a live voice agent\n2. Check concurrency before dialling out in bulk. Above it calls are rejected with hangup cause 5030, above CPS they queue\n3. Don't rely on the status callback alone to learn a call ended. Poll the call if the webhook doesn't arrive\n4. Validate webhook signatures before acting on call events\n\n### Vonage Voice API + MCP\n\n1. Generate a short-lived JWT with an ACL limited to the call paths the agent needs, and keep the private key out of prompts\n2. Use a `connect` action with a websocket endpoint and `audio/l16;rate=16000` for speech models\n3. Keep the api.nexmo.com hostname, Vonage's llms.txt says not to swap it\n4. Enable signed webhooks and verify the HS256 JWT on each event\n5. Expect RFC 7807 errors (`type`, `title`, `detail`, `instance`) and back off on a throttling error, since no Voice rate limit is published\n\n## Other comparisons with Plivo Voice API or Vonage Voice API + MCP\n\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 Vonage Voice API + MCP](https://www.anchorterminal.com/compare/bandwidth-voice-vs-vonage-voice.md)\n- [Exotel Voice API + MCP vs Plivo Voice API](https://www.anchorterminal.com/compare/exotel-voice-vs-plivo-voice.md)\n- [Exotel Voice API + MCP vs Vonage Voice API + MCP](https://www.anchorterminal.com/compare/exotel-voice-vs-vonage-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 Vonage Voice API + MCP](https://www.anchorterminal.com/compare/infobip-calls-vs-vonage-voice.md)\n- [Plivo Voice API vs SignalWire Voice API](https://www.anchorterminal.com/compare/plivo-voice-vs-signalwire-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 Telnyx Voice API + MCP](https://www.anchorterminal.com/compare/plivo-voice-vs-telnyx-voice.md)\n- [Plivo Voice API vs Twilio Programmable Voice API + MCP](https://www.anchorterminal.com/compare/plivo-voice-vs-twilio-voice.md)\n- [Plivo Voice API vs Voximplant](https://www.anchorterminal.com/compare/plivo-voice-vs-voximplant.md)\n- [SignalWire Voice API vs Vonage Voice API + MCP](https://www.anchorterminal.com/compare/signalwire-voice-vs-vonage-voice.md)\n- [Sinch Voice API + MCP vs Vonage Voice API + MCP](https://www.anchorterminal.com/compare/sinch-voice-vs-vonage-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 Vonage Voice API + MCP](https://www.anchorterminal.com/compare/twilio-voice-vs-vonage-voice.md)\n- [Vonage Voice API + MCP vs Voximplant](https://www.anchorterminal.com/compare/vonage-voice-vs-voximplant.md)\n", "meta": { "attribution": "Anchor Terminal (https://www.anchorterminal.com)", "docs": "https://www.anchorterminal.com/docs/", "generatedAt": "2026-10-05", "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": "Plivo Voice API vs Vonage Voice API + MCP", "url": "" } ], "description": "Plivo Voice API has a score of 60.4 (C) against Vonage Voice API + MCP's 59.1 (C). Both do voice calls. The largest gap is schema \u0026 documentation, 29 points. Category scores, facts, verdicts and agent notes side by side.", "facts": [ "Plivo Voice API C 60.4", "Vonage Voice API + MCP C 59.1", "scores" ], "h1": "Plivo Voice API vs Vonage Voice API + MCP", "image": "https://www.anchorterminal.com/assets/og/compare-plivo-voice-vs-vonage-voice.png", "path": "/compare/plivo-voice-vs-vonage-voice", "published": "2026-10-01", "section": "tools", "title": "Plivo Voice API vs Vonage Voice API + MCP for AI agents", "toc": null, "updated": "2026-10-05", "url": "https://www.anchorterminal.com/compare/plivo-voice-vs-vonage-voice" }, "tokens": { "markdown": 1650, "slim": 380 }, "version": 1 }