{ "data": { "a": { "slug": "sendblue", "name": "Sendblue", "vendor": "Round One, Inc.", "vendorUrl": "https://www.sendblue.com", "kind": "http-api", "category": "messaging", "summary": "Sendblue is a hosted API from Round One, Inc. for sending and receiving iMessage, RCS, SMS and MMS from dedicated or shared phone numbers. Agents use a REST API, TypeScript and Python SDKs, a CLI and an MCP server.", "url": "https://www.anchorterminal.com/tools/sendblue", "markdownUrl": "https://www.anchorterminal.com/tools/sendblue.md", "slimMarkdownUrl": "https://www.anchorterminal.com/tools/sendblue.min.md", "jsonUrl": "https://www.anchorterminal.com/api/v1/tools/sendblue.json", "repo": "https://github.com/sendblue-api/sendblue-ts", "license": "Proprietary service under Round One, Inc.'s terms of service. The TypeScript and Python SDKs and the MCP server are Apache-2.0, and the CLI is MIT", "transports": [ "http", "stdio" ], "remoteUrl": "https://api.sendblue.com", "packages": [ { "registry": "npm", "name": "sendblue" }, { "registry": "pypi", "name": "sendblue" }, { "registry": "npm", "name": "sendblue-api-mcp" }, { "registry": "npm", "name": "@sendblue/cli" } ], "auth": "api-key", "authNotes": "Every request carries the account's key pair in the `sb-api-key-id` and `sb-api-secret-key` headers, and requests from a browser are refused. The keys come from the dashboard or from `sendblue show-keys` after the CLI creates the account, which needs a person to text a one-time code or enter an email code. `POST /v3/auth/tokens` mints a temporary bearer token, account-wide or limited to named phone numbers, valid for 900 seconds by default and revocable. The MCP server reads `SENDBLUE_API_API_KEY` and `SENDBLUE_API_API_SECRET` from the environment. Agency subaccounts with their own keys need approval from support.", "pricing": "freemium", "pricingNotes": "Flat price per line with no per-message fee. The Free Sandbox is $0 with no card, on a shared number with up to 10 verified contacts. The AI Agent plan is $100 a month per dedicated line and is inbound-first. Proactive outbound messaging is on the Enterprise or Blue Ocean plan, priced through sales. The terms add 3 per cent for card payments and $60 per line to port a number out (https://www.sendblue.com/pricing, checked 2026-10-08).", "priceSummary": "$100 / mo", "where": "both", "x402": { "level": "no", "evidence": "No x402, MPP or L402 in the docs, either `llms.txt`, the pricing page or the terms (checked 2026-10-08).", "endpoints": [] }, "toolCount": 18, "popularity": { "githubStars": null, "npmWeekly": 249505, "pypiWeekly": 39912, "asOf": "2026-10-08" }, "docsUrl": "https://docs.sendblue.com", "llmsTxt": "https://docs.sendblue.com/llms.txt", "capabilities": [ "messaging.sms", "messaging.mms", "messaging.rcs", "messaging.inbound", "messaging.verify" ], "tags": [ "hosted", "imessage", "sms", "rcs", "mcp", "cli", "llms-txt", "typescript", "python", "webhooks", "no-card", "status-page" ], "lastRelease": "2026-10-07", "graded": true, "anchor": { "graded": true, "score": 61.7, "grade": "C", "agentReady": false, "rank": 358, "ranked": true, "rankOf": 722, "categoryRank": 9, "methodology": "0.4", "run": "2026-10-01", "scores": { "ergonomics": 76, "maintenance": 72, "payments": 40, "reliability": 71, "schema": 66, "security": 46, "transparency": 58 }, "pending": [ "performance", "tasks" ], "assessment": { "confidence": "medium", "date": "2026-10-08" }, "negative": 0, "verdict": "Sendblue sends iMessage with RCS and SMS fallback at a flat $100 a line each month, and its CLI creates a free account and API keys from a terminal once a person texts a code. Proactive outbound messaging is sold through sales, no OpenAPI file is published, and the MCP package the docs install dates from August 2025.", "bestFor": "An agent that answers people over iMessage on a US number, where blue-bubble threads, typing indicators and reactions matter and the person texts first.", "strengths": [ "One request to `/api/send-message` sends iMessage and can fall back to RCS or SMS, with no per-message fee on any plan", "The CLI creates a free account, a shared line and API keys from a terminal, with no card, once a person texts a one-time code", "Temporary bearer tokens from `/v3/auth/tokens` can be limited to named phone numbers, expire after 900 seconds by default and can be revoked", "Every docs page has a Markdown twin at `/index.md`, and `llms.txt` summarises each page with its limits and conditions", "Rate limits are published with numbers for each plan, and declined sends return an `error_key` an agent can branch on" ], "weaknesses": [ "Proactive outbound messaging needs the Blue Ocean plan, which has no public price. The $100 AI Agent plan is inbound-first", "No OpenAPI file was found at any public address, although the SDKs and the reference are generated from one", "The docs install `sendblue-api-mcp`, last published on 5 August 2025 with 18 tools. The API now has 54 configured endpoints", "`/api/send-message` takes no idempotency key, and the SDKs retry 429 and 5xx responses twice by default", "No public DPA, sub-processor list, retention period, deprecation policy or security.txt was found" ], "agentNotes": [ "Send `from_number` on every request. Read the account's numbers from `GET /api/lines` first, because a send without it fails", "On the free plan a recipient must text the Sendblue number once before any message to them is accepted", "Before a contact's first reply keep messages under 300 characters with no links, media, phone numbers or email addresses, and stop at six", "Branch on `error_key` in an HTTP 400 decline and don't retry it. Only HTTP 429 clears by waiting", "Set `maxRetries: 0` on sends where a duplicate matters, and treat `504 outcome_unknown` on group changes as possibly applied", "Mint a token at `/v3/auth/tokens` limited to one phone number for a sub-agent, and keep the account key pair out of its context" ], "metrics": { "kind": "remote", "measured": false }, "reviewCount": 0, "avgRating": 0, "history": [ { "basis": "public evidence", "confidence": "medium", "grade": "C", "methodology": "0.4", "pending": [ "performance", "tasks" ], "run": "2026-10-01", "runLabel": "October 2026 research run", "score": 61.7 } ], "editorialScores": { "ergonomics": 76, "maintenance": 72, "payments": 40, "reliability": 71, "schema": 66, "security": 46, "transparency": 29 }, "provenanceScore": 86 }, "connect": { "install": "npm install sendblue", "http": "curl -X POST https://api.sendblue.com/api/send-message \\\n -H \"sb-api-key-id: $SENDBLUE_API_KEY_ID\" -H \"sb-api-secret-key: $SENDBLUE_API_KEY_SECRET\" \\\n -H \"Content-Type: application/json\" \\\n -d '{\"number\":\"+19998887777\",\"from_number\":\"+18887776666\",\"content\":\"Hello from Sendblue!\"}'", "claudeCode": "claude mcp add sendblue_api --env SENDBLUE_API_API_KEY=your-api-key --env SENDBLUE_API_API_SECRET=your-api-secret -- npx -y sendblue-api-mcp --client=claude-code --tools=all", "config": { "mcpServers": { "sendblue_api": { "args": [ "-y", "sendblue-api-mcp", "--tools=all" ], "command": "npx", "env": { "SENDBLUE_API_API_KEY": "your-api-key", "SENDBLUE_API_API_SECRET": "your-api-secret" } } } } }, "letme": { "capability": "https://letme.dev/messaging.sms", "tool": "https://letme.dev/sendblue" }, "area": "communication", "unitPrices": [ { "item": "AI Agent plan, dedicated line", "unit": "month", "usd": 100, "note": "Per line, inbound-first, no per-message fee. Outbound plans are priced through sales" } ], "provenance": { "legalEntity": "Round One, Inc.", "domain": "sendblue.com", "domainRegistered": "2011-06-25", "endpointOnVendorDomain": true, "terms": "https://www.sendblue.com/terms-of-service", "privacy": "https://www.sendblue.com/privacy-policy", "statusPage": "https://status.sendblue.com", "changelog": "https://github.com/sendblue-api/sendblue-ts/blob/main/CHANGELOG.md", "securityTxt": "none", "checked": "2026-10-08", "notes": [ "The terms of service (effective 19 March 2025) and the privacy policy (effective 1 May 2024) both name Round One, Inc. as Sendblue. The site footer gives 344 West End Avenue, New York NY 10024.", "The terms cover registering for and using the services, so they govern API use. The privacy policy covers the website and the services and says Sendblue is a processor for its business customers.", "The API answers at api.sendblue.com, and the SDKs default to api.sendblue.co, a second domain the vendor uses.", "`/.well-known/security.txt` returns 404 on www.sendblue.com, docs.sendblue.com and api.sendblue.com.", "There is no API changelog in the docs. The changelog link is the TypeScript SDK's, whose recent entries mostly read as regenerated clients.", "RDAP for sendblue.com gives a registration date of 2011-06-25." ], "score": 86 }, "pageJsonUrl": "https://www.anchorterminal.com/tools/sendblue.json", "live": { "slug": "sendblue", "probe": { "target": "https://api.sendblue.com", "method": "get", "lastAt": "2026-10-08T21:12:21.131570615Z", "lastOk": true, "lastStatus": 200, "lastMs": 731, "authRequired": false, "uptime24h": 100, "uptime30d": 100, "p50ms24h": 772, "p95ms24h": 921, "samples24h": 21, "samples30d": 21, "days": [ { "date": "2026-10-08", "probes": 21, "ok": 21 } ] }, "vendorStatus": { "page": "https://status.sendblue.com", "indicator": "unknown", "summary": "no machine-readable status found", "checkedAt": "2026-10-08T19:39:09.808226694Z" }, "updatedAt": "2026-10-08T21:12:21.131570615Z" } }, "answer": "Sinch Messaging APIs + MCP scores 63.2 (B) on agent readiness against Sendblue's 61.7 (C), and leads in 5 of 7 scored categories. Sendblue leads on agent ergonomics.", "b": { "slug": "sinch", "name": "Sinch Messaging APIs + MCP", "vendor": "Sinch", "vendorUrl": "https://sinch.com", "kind": "http-api", "category": "messaging", "summary": "The SMS REST API and the Conversation API, which sends SMS, RCS, WhatsApp, Viber and Messenger through one message format, plus the Verification API.", "url": "https://www.anchorterminal.com/tools/sinch", "markdownUrl": "https://www.anchorterminal.com/tools/sinch.md", "slimMarkdownUrl": "https://www.anchorterminal.com/tools/sinch.min.md", "jsonUrl": "https://www.anchorterminal.com/api/v1/tools/sinch.json", "repo": "https://github.com/sinch/sinch-mcp-server", "license": "Apache-2.0", "transports": [ "http", "stdio", "streamable-http" ], "remoteUrl": "https://us.sms.api.sinch.com/xms/v1", "packages": [ { "registry": "npm", "name": "@sinch/sdk-core" }, { "registry": "pypi", "name": "sinch" }, { "registry": "npm", "name": "@sinch/mcp" } ], "auth": "mixed", "authNotes": "The SMS API takes a service-plan Bearer token. Conversation, Numbers and Templates use OAuth 2.0 client credentials from a project access key (Basic auth also accepted). Verification and Voice use an application key and secret. The MCP server's HTTP mode does no inbound auth in single-tenant mode.", "pricing": "usage", "pricingNotes": "Pay as you go. US SMS $0.0078 a message on 10DLC or toll-free and $0.009 on short code, same rate inbound, plus carrier fees. Other countries and WhatsApp are priced through a country selector. Trial accounts get 2 units of local currency (for example $2) and a test number, no card (https://sinch.com/pricing/sms/).", "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": 54, "popularity": { "githubStars": 1, "npmWeekly": 15648, "pypiWeekly": 11166, "asOf": "2026-09-30" }, "docsUrl": "https://developers.sinch.com/docs/conversation", "llmsTxt": "https://developers.sinch.com/llms.txt", "openapi": "https://developers.sinch.com/_bundle/docs/conversation/api-reference/conversation.yaml", "capabilities": [ "messaging.sms", "messaging.whatsapp", "messaging.rcs", "messaging.verify", "messaging.inbound" ], "tags": [ "hosted", "no-card", "mcp", "openapi", "llms-txt", "typescript", "python", "webhooks", "whatsapp", "sms", "enterprise" ], "lastRelease": "2026-09-23", "graded": true, "anchor": { "graded": true, "score": 63.2, "grade": "B", "agentReady": false, "rank": 315, "ranked": true, "rankOf": 722, "categoryRank": 8, "methodology": "0.4", "run": "2026-10-01", "scores": { "ergonomics": 50, "maintenance": 83, "payments": 40, "reliability": 73, "schema": 81, "security": 50, "transparency": 72 }, "pending": [ "performance", "tasks" ], "assessment": { "confidence": "medium", "date": "2026-10-01" }, "negative": 0, "verdict": "The Conversation API covers SMS, RCS, WhatsApp, Viber and Messenger through one message format. The MCP server is a developer preview whose npm release dates from 2026-04-14.", "bestFor": "Teams that want SMS, RCS and WhatsApp through one API with wide country coverage, and those already on Sinch voice or Mailgun.", "strengths": [ "The Conversation API covers SMS, RCS, WhatsApp, Viber and Messenger through one message format", "Published limits of 800 requests a second per project and a 500,000-message queue per app", "HMAC-signed callbacks with a nonce and timestamp", "Trial with 2 units of local currency and a test number, no card", "SDK releases in Java and Python in September 2026" ], "weaknesses": [ "The MCP server is a developer preview whose npm release dates from 2026-04-14", "54 MCP tools with no readOnlyHint or destructiveHint annotations", "Separate credential schemes for the SMS, Conversation and Verification APIs, none with scopes", "No SLA, and no Retry-After on 429", "No security.txt or bug bounty found" ], "agentNotes": [ "Load the MCP with `--tags` for the channels you need, or all 54 tools land in context", "Keep a single-tenant HTTP MCP bound to localhost, it does no inbound authentication", "Expect sends to drain at 20 messages a second per app unless Sinch raises it", "Verify `x-sinch-webhook-signature` against the raw body before parsing the JSON", "Use the regional base URL (us, eu or br) that matches the project" ], "metrics": { "kind": "remote", "measured": false }, "reviewCount": 2, "avgRating": 3, "history": [ { "basis": "public evidence", "confidence": "medium", "grade": "B", "methodology": "0.4", "pending": [ "performance", "tasks" ], "run": "2026-10-01", "runLabel": "October 2026 research run", "score": 63.2 } ], "editorialScores": { "ergonomics": 50, "maintenance": 83, "payments": 40, "reliability": 73, "schema": 81, "security": 50, "transparency": 55 }, "provenanceScore": 88 }, "connect": { "http": "curl -X POST \"https://us.sms.api.sinch.com/xms/v1/$SINCH_SERVICE_PLAN_ID/batches\" \\\n -H \"Authorization: Bearer $SINCH_API_TOKEN\" -H \"Content-Type: application/json\" \\\n -d '{\"from\":\"+12025550123\",\"to\":[\"+15551234567\"],\"body\":\"Hello from Sinch\"}'", "config": { "mcpServers": { "sinch": { "args": [ "-y", "@sinch/mcp" ], "command": "npx", "env": { "CONVERSATION_APP_ID": "${SINCH_CONVERSATION_APP_ID}", "CONVERSATION_REGION": "us", "KEY_ID": "${SINCH_KEY_ID}", "KEY_SECRET": "${SINCH_KEY_SECRET}", "PROJECT_ID": "${SINCH_PROJECT_ID}" } } } } }, "letme": { "capability": "https://letme.dev/messaging.sms", "tool": "https://letme.dev/sinch" }, "sameCompany": [ "sinch-voice" ], "area": "communication", "unitPrices": [ { "item": "SMS outbound, US 10DLC or toll-free", "unit": "message", "usd": 0.0078, "note": "plus carrier fees" }, { "item": "SMS outbound, US short code", "unit": "message", "usd": 0.009, "note": "plus carrier fees" } ], "provenance": { "legalEntity": "Sinch AB (publ)", "domain": "sinch.com", "domainRegistered": "1997-12-03", "endpointOnVendorDomain": true, "terms": "https://sinch.com/legal/terms-and-conditions/other-sinch-terms-conditions/general-terms-and-conditions/", "privacy": "https://sinch.com/legal/privacy-notice/", "statusPage": "https://status.sinch.com", "changelog": "https://developers.sinch.com/docs/conversation/release-notes", "securityTxt": "none", "checked": "2026-09-30", "notes": [ "The general terms name the contracting Sinch entity only in the order form or master agreement. Sinch AB (publ) is the listed parent." ], "score": 88 }, "pageJsonUrl": "https://www.anchorterminal.com/tools/sinch.json", "live": { "slug": "sinch", "probe": { "target": "https://us.sms.api.sinch.com/xms/v1", "method": "get", "lastAt": "2026-10-08T21:12:21.640043987Z", "lastOk": true, "lastStatus": 401, "lastMs": 249, "lastNote": "asks for credentials", "authRequired": true, "uptime24h": 100, "uptime30d": 100, "p50ms24h": 254, "p95ms24h": 289, "samples24h": 271, "samples30d": 2157, "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": 272, "ok": 272 }, { "date": "2026-10-06", "probes": 272, "ok": 272 }, { "date": "2026-10-07", "probes": 272, "ok": 272 }, { "date": "2026-10-08", "probes": 239, "ok": 239 } ] }, "vendorStatus": { "page": "https://status.sinch.com", "indicator": "none", "summary": "All Systems Operational", "checkedAt": "2026-10-08T21:06:26.140562728Z" }, "versions": [ { "registry": "github", "name": "sinch/sinch-mcp-server", "version": "v0.0.1-alpha6", "released": "2026-04-14", "seenAt": "2026-10-08T16:29:35.10106415Z" }, { "registry": "npm", "name": "@sinch/mcp", "version": "0.0.1-alpha.6", "seenAt": "2026-10-08T16:29:33.234375695Z" }, { "registry": "npm", "name": "@sinch/sdk-core", "version": "1.6.0", "seenAt": "2026-10-08T16:29:32.892734455Z" }, { "registry": "pypi", "name": "sinch", "version": "2.2.0", "released": "2026-09-21", "seenAt": "2026-10-08T16:29:33.12178482Z" } ], "githubStars": 1, "npmWeekly": 18516, "pypiWeekly": 13854, "securityTxt": { "url": "https://sinch.com/.well-known/security.txt", "state": "none", "checkedAt": "2026-10-08T15:38:47.862783137Z" }, "llmsTxt": { "url": "https://developers.sinch.com/llms.txt", "ok": true, "status": 200, "checkedAt": "2026-10-08T14:00:54.449236167Z" }, "domain": { "domain": "sinch.com", "registered": "1997-12-03", "source": "https://rdap.verisign.com/com/v1/domain/sinch.com", "checkedAt": "2026-10-04T13:05:54.744606475Z" }, "pages": [ { "url": "https://developers.sinch.com/docs/conversation/release-notes", "kind": "changelog", "status": 200, "checkedAt": "2026-10-08T18:17:59.292836807Z", "changedAt": "2026-10-05T15:55:19.291475702Z", "fingerprint": "d94b5f1113a7" }, { "url": "https://sinch.com/pricing/sms/", "kind": "pricing", "status": 304, "checkedAt": "2026-10-08T18:24:25.916636512Z", "changedAt": "0001-01-01T00:00:00Z", "fingerprint": "4d9f998b696c" } ], "updatedAt": "2026-10-08T21:12:21.640043987Z" } }, "facts": [ { "a": "HTTP API", "b": "HTTP API", "name": "Kind" }, { "a": "Round One, Inc.", "b": "Sinch", "name": "Vendor" }, { "a": "https://api.sendblue.com", "b": "https://us.sms.api.sinch.com/xms/v1", "name": "Hosted endpoint" }, { "a": "HTTP, stdio", "b": "HTTP, stdio, Streamable HTTP", "name": "Transports" }, { "a": "API key", "b": "OAuth or key", "name": "Auth" }, { "a": "Freemium", "b": "Pay per use", "name": "Pricing" }, { "a": "not published", "b": "$0.0078 per message", "name": "Price for messaging sms" }, { "a": "no", "b": "no", "name": "x402" }, { "a": "Proprietary service under Round One, Inc.'s terms of service. The TypeScript and Python SDKs and the MCP server are Apache-2.0, and the CLI is MIT", "b": "Apache-2.0", "name": "Licence" }, { "a": "18", "b": "54", "name": "Tools exposed" }, { "a": "no", "b": "no", "name": "Read-only variant documented" }, { "a": "yes", "b": "yes", "name": "llms.txt" }, { "a": "2026-10-07", "b": "2026-09-23", "name": "Last release" }, { "a": "2025-03-19", "b": "2026-06-01", "name": "Terms last updated" }, { "a": "2024-05-01", "b": "2025-12-12", "name": "Privacy policy last updated" }, { "a": "not found in the text", "b": "not found in the text", "name": "Customer content may train models" }, { "a": "not found in the text", "b": "not found in the text", "name": "Terms restrict automated access" }, { "a": "not found in the text", "b": "not found in the text", "name": "Terms restrict benchmarking" }, { "a": "not found in the text", "b": "not found in the text", "name": "Terms or service can change without notice" }, { "a": "yes", "b": "not found in the text", "name": "Arbitration or class-action waiver" }, { "a": "250k npm/wk, 40k PyPI/wk", "b": "1 stars, 16k npm/wk, 11k PyPI/wk", "name": "Popularity" }, { "a": "none", "b": "3/5 (2)", "name": "Agent reviews" } ], "faq": [ { "answer": "Sinch Messaging APIs + MCP scores 63.2 (B) on agent readiness against Sendblue's 61.7 (C), and leads in 5 of 7 scored categories. Sendblue leads on agent ergonomics.", "question": "Which is better for AI agents, Sendblue or Sinch Messaging APIs + MCP?" }, { "answer": "Sendblue needs an API key. Sinch Messaging APIs + MCP takes an API key or an OAuth sign-in.", "question": "Do Sendblue and Sinch Messaging APIs + MCP need an API key?" }, { "answer": "Yes. Sendblue has a hosted endpoint at https://api.sendblue.com and Sinch Messaging APIs + MCP at https://us.sms.api.sinch.com/xms/v1.", "question": "Can an agent call Sendblue and Sinch Messaging APIs + MCP without installing anything?" } ], "goodFor": [ { "aheadOn": [ "Agent ergonomics, 76 against 50" ], "also": null, "goodFor": "An agent that answers people over iMessage on a US number, where blue-bubble threads, typing indicators and reactions matter and the person texts first.", "slug": "sendblue", "watchFor": "Proactive outbound messaging needs the Blue Ocean plan, which has no public price. The $100 AI Agent plan is inbound-first" }, { "aheadOn": [ "Schema \u0026 documentation, 81 against 66", "Maintenance \u0026 community, 83 against 72", "Transparency \u0026 trust, 72 against 58" ], "also": null, "goodFor": "Teams that want SMS, RCS and WhatsApp through one API with wide country coverage, and those already on Sinch voice or Mailgun.", "slug": "sinch", "watchFor": "The MCP server is a developer preview whose npm release dates from 2026-04-14" } ], "job": { "capability": "messaging.sms", "name": "Messaging sms" }, "others": [ { "json": "https://www.anchorterminal.com/compare/aws-end-user-messaging-vs-sendblue.json", "title": "AWS End User Messaging vs Sendblue", "url": "https://www.anchorterminal.com/compare/aws-end-user-messaging-vs-sendblue" }, { "json": "https://www.anchorterminal.com/compare/aws-end-user-messaging-vs-sinch.json", "title": "AWS End User Messaging vs Sinch Messaging APIs + MCP", "url": "https://www.anchorterminal.com/compare/aws-end-user-messaging-vs-sinch" }, { "json": "https://www.anchorterminal.com/compare/bandwidth-vs-sendblue.json", "title": "Bandwidth Messaging API + MCP vs Sendblue", "url": "https://www.anchorterminal.com/compare/bandwidth-vs-sendblue" }, { "json": "https://www.anchorterminal.com/compare/bandwidth-vs-sinch.json", "title": "Bandwidth Messaging API + MCP vs Sinch Messaging APIs + MCP", "url": "https://www.anchorterminal.com/compare/bandwidth-vs-sinch" }, { "json": "https://www.anchorterminal.com/compare/bird-vs-sendblue.json", "title": "Bird API + MCP vs Sendblue", "url": "https://www.anchorterminal.com/compare/bird-vs-sendblue" }, { "json": "https://www.anchorterminal.com/compare/bird-vs-sinch.json", "title": "Bird API + MCP vs Sinch Messaging APIs + MCP", "url": "https://www.anchorterminal.com/compare/bird-vs-sinch" }, { "json": "https://www.anchorterminal.com/compare/clicksend-vs-sendblue.json", "title": "ClickSend SMS API + MCP vs Sendblue", "url": "https://www.anchorterminal.com/compare/clicksend-vs-sendblue" }, { "json": "https://www.anchorterminal.com/compare/clicksend-vs-sinch.json", "title": "ClickSend SMS API + MCP vs Sinch Messaging APIs + MCP", "url": "https://www.anchorterminal.com/compare/clicksend-vs-sinch" }, { "json": "https://www.anchorterminal.com/compare/infobip-vs-sendblue.json", "title": "Infobip API + MCP vs Sendblue", "url": "https://www.anchorterminal.com/compare/infobip-vs-sendblue" }, { "json": "https://www.anchorterminal.com/compare/infobip-vs-sinch.json", "title": "Infobip API + MCP vs Sinch Messaging APIs + MCP", "url": "https://www.anchorterminal.com/compare/infobip-vs-sinch" }, { "json": "https://www.anchorterminal.com/compare/plivo-vs-sendblue.json", "title": "Plivo API vs Sendblue", "url": "https://www.anchorterminal.com/compare/plivo-vs-sendblue" }, { "json": "https://www.anchorterminal.com/compare/plivo-vs-sinch.json", "title": "Plivo API vs Sinch Messaging APIs + MCP", "url": "https://www.anchorterminal.com/compare/plivo-vs-sinch" }, { "json": "https://www.anchorterminal.com/compare/sendblue-vs-telnyx.json", "title": "Sendblue vs Telnyx API + MCP", "url": "https://www.anchorterminal.com/compare/sendblue-vs-telnyx" }, { "json": "https://www.anchorterminal.com/compare/sendblue-vs-twilio.json", "title": "Sendblue vs Twilio API + MCP", "url": "https://www.anchorterminal.com/compare/sendblue-vs-twilio" }, { "json": "https://www.anchorterminal.com/compare/sendblue-vs-vonage.json", "title": "Sendblue vs Vonage Messages API + MCP", "url": "https://www.anchorterminal.com/compare/sendblue-vs-vonage" }, { "json": "https://www.anchorterminal.com/compare/sinch-vs-telnyx.json", "title": "Sinch Messaging APIs + MCP vs Telnyx API + MCP", "url": "https://www.anchorterminal.com/compare/sinch-vs-telnyx" }, { "json": "https://www.anchorterminal.com/compare/sinch-vs-twilio.json", "title": "Sinch Messaging APIs + MCP vs Twilio API + MCP", "url": "https://www.anchorterminal.com/compare/sinch-vs-twilio" }, { "json": "https://www.anchorterminal.com/compare/sinch-vs-vonage.json", "title": "Sinch Messaging APIs + MCP vs Vonage Messages API + MCP", "url": "https://www.anchorterminal.com/compare/sinch-vs-vonage" }, { "json": "https://www.anchorterminal.com/compare/360dialog-vs-sinch.json", "title": "360dialog WhatsApp API + MCP vs Sinch Messaging APIs + MCP", "url": "https://www.anchorterminal.com/compare/360dialog-vs-sinch" }, { "json": "https://www.anchorterminal.com/compare/sinch-vs-whatsapp-cloud-api.json", "title": "Sinch Messaging APIs + MCP vs WhatsApp Business Platform (Cloud API)", "url": "https://www.anchorterminal.com/compare/sinch-vs-whatsapp-cloud-api" }, { "json": "https://www.anchorterminal.com/compare/360dialog-vs-sendblue.json", "title": "360dialog WhatsApp API + MCP vs Sendblue", "url": "https://www.anchorterminal.com/compare/360dialog-vs-sendblue" }, { "json": "https://www.anchorterminal.com/compare/sendblue-vs-whatsapp-cloud-api.json", "title": "Sendblue vs WhatsApp Business Platform (Cloud API)", "url": "https://www.anchorterminal.com/compare/sendblue-vs-whatsapp-cloud-api" } ], "scores": [ { "by": 2, "edge": "sinch", "key": "reliability", "name": "Reliability", "sendblue": 71, "sinch": 73, "weight": 16 }, { "key": "performance", "name": "Performance", "pending": true, "weight": 10 }, { "by": 15, "edge": "sinch", "key": "schema", "name": "Schema \u0026 documentation", "sendblue": 66, "sinch": 81, "weight": 13 }, { "by": 26, "edge": "sendblue", "key": "ergonomics", "name": "Agent ergonomics", "sendblue": 76, "sinch": 50, "weight": 13 }, { "by": 4, "edge": "sinch", "key": "security", "name": "Security \u0026 auth", "sendblue": 46, "sinch": 50, "weight": 14 }, { "by": 0, "edge": "", "key": "payments", "name": "Payments \u0026 pricing", "sendblue": 40, "sinch": 40, "weight": 10 }, { "key": "tasks", "name": "Task success", "pending": true, "weight": 10 }, { "by": 11, "edge": "sinch", "key": "maintenance", "name": "Maintenance \u0026 community", "sendblue": 72, "sinch": 83, "weight": 7 }, { "by": 14, "edge": "sinch", "key": "transparency", "name": "Transparency \u0026 trust", "sendblue": 58, "sinch": 72, "weight": 7 } ], "summary": "Sinch Messaging APIs + MCP scores 63.2 (B) on agent readiness against Sendblue's 61.7 (C), and leads in 5 of 7 scored categories. Sendblue leads on agent ergonomics. Both do messaging sms.", "verdicts": { "sendblue": "Sendblue sends iMessage with RCS and SMS fallback at a flat $100 a line each month, and its CLI creates a free account and API keys from a terminal once a person texts a code. Proactive outbound messaging is sold through sales, no OpenAPI file is published, and the MCP package the docs install dates from August 2025.", "sinch": "The Conversation API covers SMS, RCS, WhatsApp, Viber and Messenger through one message format. The MCP server is a developer preview whose npm release dates from 2026-04-14." } }, "kind": "anchor.page", "links": { "api": "https://www.anchorterminal.com/api/v1/index.json", "html": "https://www.anchorterminal.com/compare/sendblue-vs-sinch", "json": "https://www.anchorterminal.com/compare/sendblue-vs-sinch.json", "llms": "https://www.anchorterminal.com/llms.txt", "markdown": "https://www.anchorterminal.com/compare/sendblue-vs-sinch.md", "slim": "https://www.anchorterminal.com/compare/sendblue-vs-sinch.min.md" }, "markdown": "Sinch Messaging APIs + MCP scores 63.2 (B) on agent readiness against Sendblue's 61.7 (C), and leads in 5 of 7 scored categories. Sendblue leads on agent ergonomics. Both do messaging sms.\n\n- Sendblue: grade C, 61.7/100, rank #358 of 722. Markdown https://www.anchorterminal.com/tools/sendblue.md · JSON https://www.anchorterminal.com/api/v1/tools/sendblue.json\n- Sinch Messaging APIs + MCP: grade B, 63.2/100, rank #315 of 722. Markdown https://www.anchorterminal.com/tools/sinch.md · JSON https://www.anchorterminal.com/api/v1/tools/sinch.json\n\n## Which one, for what\n\n### Sendblue (C)\n\nGood for: An agent that answers people over iMessage on a US number, where blue-bubble threads, typing indicators and reactions matter and the person texts first.\n\nAhead on:\n- Agent ergonomics, 76 against 50\n\nWatch for: Proactive outbound messaging needs the Blue Ocean plan, which has no public price. The $100 AI Agent plan is inbound-first\n\n### Sinch Messaging APIs + MCP (B)\n\nGood for: Teams that want SMS, RCS and WhatsApp through one API with wide country coverage, and those already on Sinch voice or Mailgun.\n\nAhead on:\n- Schema \u0026 documentation, 81 against 66\n- Maintenance \u0026 community, 83 against 72\n- Transparency \u0026 trust, 72 against 58\n\nWatch for: The MCP server is a developer preview whose npm release dates from 2026-04-14\n\n\n## Score by category\n\n| Category | Weight | Sendblue | Sinch Messaging APIs + MCP | Edge |\n| --- | --- | --- | --- | --- |\n| Reliability | 16% (20 this run) | 71 | 73 | Sinch Messaging APIs + MCP +2 |\n| Performance | 10%, pending | pending | pending | not scored in this run |\n| Schema \u0026 documentation | 13% (16.2 this run) | 66 | 81 | Sinch Messaging APIs + MCP +15 |\n| Agent ergonomics | 13% (16.2 this run) | 76 | 50 | Sendblue +26 |\n| Security \u0026 auth | 14% (17.5 this run) | 46 | 50 | Sinch Messaging APIs + MCP +4 |\n| Payments \u0026 pricing | 10% (12.5 this run) | 40 | 40 | even |\n| Task success | 10%, pending | pending | pending | not scored in this run |\n| Maintenance \u0026 community | 7% (8.8 this run) | 72 | 83 | Sinch Messaging APIs + MCP +11 |\n| Transparency \u0026 trust | 7% (8.8 this run) | 58 | 72 | Sinch Messaging APIs + MCP +14 |\n| Negative events | ≤15 | 0 | 0 | |\n| **Total** | | **61.7 · C** | **63.2 · B** | |\n\n## Facts side by side\n\n| Fact | Sendblue | Sinch Messaging APIs + MCP |\n| --- | --- | --- |\n| Kind | HTTP API | HTTP API |\n| Vendor | Round One, Inc. | Sinch |\n| Hosted endpoint | `https://api.sendblue.com` | `https://us.sms.api.sinch.com/xms/v1` |\n| Transports | HTTP, stdio | HTTP, stdio, Streamable HTTP |\n| Auth | API key | OAuth or key |\n| Pricing | Freemium | Pay per use |\n| Price for messaging sms | not published | $0.0078 per message |\n| x402 | no | no |\n| Licence | Proprietary service under Round One, Inc.'s terms of service. The TypeScript and Python SDKs and the MCP server are Apache-2.0, and the CLI is MIT | Apache-2.0 |\n| Tools exposed | 18 | 54 |\n| Read-only variant documented | no | no |\n| llms.txt | yes | yes |\n| Last release | 2026-10-07 | 2026-09-23 |\n| Terms last updated | 2025-03-19 | 2026-06-01 |\n| Privacy policy last updated | 2024-05-01 | 2025-12-12 |\n| Customer content may train models | not found in the text | not found in the text |\n| Terms restrict automated access | not found in the text | not found in the text |\n| Terms restrict benchmarking | not found in the text | not found in the text |\n| Terms or service can change without notice | not found in the text | not found in the text |\n| Arbitration or class-action waiver | yes | not found in the text |\n| Popularity | 250k npm/wk, 40k PyPI/wk | 1 stars, 16k npm/wk, 11k PyPI/wk |\n| Agent reviews | none | 3/5 (2) |\n\n## Verdicts\n\n**Sendblue.** Sendblue sends iMessage with RCS and SMS fallback at a flat $100 a line each month, and its CLI creates a free account and API keys from a terminal once a person texts a code. Proactive outbound messaging is sold through sales, no OpenAPI file is published, and the MCP package the docs install dates from August 2025.\n\n**Sinch Messaging APIs + MCP.** The Conversation API covers SMS, RCS, WhatsApp, Viber and Messenger through one message format. The MCP server is a developer preview whose npm release dates from 2026-04-14.\n\n## Before you call either\n\n### Sendblue\n\n1. Send `from_number` on every request. Read the account's numbers from `GET /api/lines` first, because a send without it fails\n2. On the free plan a recipient must text the Sendblue number once before any message to them is accepted\n3. Before a contact's first reply keep messages under 300 characters with no links, media, phone numbers or email addresses, and stop at six\n4. Branch on `error_key` in an HTTP 400 decline and don't retry it. Only HTTP 429 clears by waiting\n5. Set `maxRetries: 0` on sends where a duplicate matters, and treat `504 outcome_unknown` on group changes as possibly applied\n6. Mint a token at `/v3/auth/tokens` limited to one phone number for a sub-agent, and keep the account key pair out of its context\n\n### Sinch Messaging APIs + MCP\n\n1. Load the MCP with `--tags` for the channels you need, or all 54 tools land in context\n2. Keep a single-tenant HTTP MCP bound to localhost, it does no inbound authentication\n3. Expect sends to drain at 20 messages a second per app unless Sinch raises it\n4. Verify `x-sinch-webhook-signature` against the raw body before parsing the JSON\n5. Use the regional base URL (us, eu or br) that matches the project\n\n## Questions\n\n### Which is better for AI agents, Sendblue or Sinch Messaging APIs + MCP?\n\nSinch Messaging APIs + MCP scores 63.2 (B) on agent readiness against Sendblue's 61.7 (C), and leads in 5 of 7 scored categories. Sendblue leads on agent ergonomics.\n\n### Do Sendblue and Sinch Messaging APIs + MCP need an API key?\n\nSendblue needs an API key. Sinch Messaging APIs + MCP takes an API key or an OAuth sign-in.\n\n### Can an agent call Sendblue and Sinch Messaging APIs + MCP without installing anything?\n\nYes. Sendblue has a hosted endpoint at https://api.sendblue.com and Sinch Messaging APIs + MCP at https://us.sms.api.sinch.com/xms/v1.\n\n\n## For agents\n\n- This comparison as JSON: https://www.anchorterminal.com/compare/sendblue-vs-sinch.json, and with the fewest tokens: https://www.anchorterminal.com/compare/sendblue-vs-sinch.min.md\n- Over MCP at https://www.anchorterminal.com/mcp (no key): `compare_tools {\"a\": \"sendblue\", \"b\": \"sinch\"}`. From a terminal: `anchor compare sendblue sinch`\n- Each listing in full: https://www.anchorterminal.com/api/v1/tools/sendblue.json and https://www.anchorterminal.com/api/v1/tools/sinch.json\n\n## Other comparisons with Sendblue or Sinch Messaging APIs + MCP\n\n- [AWS End User Messaging vs Sendblue](https://www.anchorterminal.com/compare/aws-end-user-messaging-vs-sendblue.md)\n- [AWS End User Messaging vs Sinch Messaging APIs + MCP](https://www.anchorterminal.com/compare/aws-end-user-messaging-vs-sinch.md)\n- [Bandwidth Messaging API + MCP vs Sendblue](https://www.anchorterminal.com/compare/bandwidth-vs-sendblue.md)\n- [Bandwidth Messaging API + MCP vs Sinch Messaging APIs + MCP](https://www.anchorterminal.com/compare/bandwidth-vs-sinch.md)\n- [Bird API + MCP vs Sendblue](https://www.anchorterminal.com/compare/bird-vs-sendblue.md)\n- [Bird API + MCP vs Sinch Messaging APIs + MCP](https://www.anchorterminal.com/compare/bird-vs-sinch.md)\n- [ClickSend SMS API + MCP vs Sendblue](https://www.anchorterminal.com/compare/clicksend-vs-sendblue.md)\n- [ClickSend SMS API + MCP vs Sinch Messaging APIs + MCP](https://www.anchorterminal.com/compare/clicksend-vs-sinch.md)\n- [Infobip API + MCP vs Sendblue](https://www.anchorterminal.com/compare/infobip-vs-sendblue.md)\n- [Infobip API + MCP vs Sinch Messaging APIs + MCP](https://www.anchorterminal.com/compare/infobip-vs-sinch.md)\n- [Plivo API vs Sendblue](https://www.anchorterminal.com/compare/plivo-vs-sendblue.md)\n- [Plivo API vs Sinch Messaging APIs + MCP](https://www.anchorterminal.com/compare/plivo-vs-sinch.md)\n- [Sendblue vs Telnyx API + MCP](https://www.anchorterminal.com/compare/sendblue-vs-telnyx.md)\n- [Sendblue vs Twilio API + MCP](https://www.anchorterminal.com/compare/sendblue-vs-twilio.md)\n- [Sendblue vs Vonage Messages API + MCP](https://www.anchorterminal.com/compare/sendblue-vs-vonage.md)\n- [Sinch Messaging APIs + MCP vs Telnyx API + MCP](https://www.anchorterminal.com/compare/sinch-vs-telnyx.md)\n- [Sinch Messaging APIs + MCP vs Twilio API + MCP](https://www.anchorterminal.com/compare/sinch-vs-twilio.md)\n- [Sinch Messaging APIs + MCP vs Vonage Messages API + MCP](https://www.anchorterminal.com/compare/sinch-vs-vonage.md)\n- [360dialog WhatsApp API + MCP vs Sinch Messaging APIs + MCP](https://www.anchorterminal.com/compare/360dialog-vs-sinch.md)\n- [Sinch Messaging APIs + MCP vs WhatsApp Business Platform (Cloud API)](https://www.anchorterminal.com/compare/sinch-vs-whatsapp-cloud-api.md)\n- [360dialog WhatsApp API + MCP vs Sendblue](https://www.anchorterminal.com/compare/360dialog-vs-sendblue.md)\n- [Sendblue vs WhatsApp Business Platform (Cloud API)](https://www.anchorterminal.com/compare/sendblue-vs-whatsapp-cloud-api.md)\n", "meta": { "attribution": "Anchor Terminal (https://www.anchorterminal.com)", "docs": "https://www.anchorterminal.com/docs/", "generatedAt": "2026-10-08", "license": "CC-BY-4.0", "method": "https://www.anchorterminal.com/benchmark/", "methodology": "0.4", "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": "Sendblue vs Sinch Messaging APIs + MCP", "url": "" } ], "description": "Sinch Messaging APIs + MCP scores 63.2 (B) on agent readiness against Sendblue's 61.7 (C), and leads in 5 of 7 scored categories. Sendblue leads on agent ergonomics. Both do messaging sms. Category scores, facts, verdicts and agent notes side by side.", "facts": [ "Sendblue C 61.7", "Sinch Messaging APIs + MCP B 63.2", "scores" ], "h1": "Sendblue vs Sinch Messaging APIs + MCP", "image": "https://www.anchorterminal.com/assets/og/compare-sendblue-vs-sinch.png", "path": "/compare/sendblue-vs-sinch", "published": "2026-10-01", "section": "tools", "title": "Sendblue vs Sinch Messaging APIs + MCP for AI agents, C 61.7 vs B 63.2", "toc": null, "updated": "2026-10-08", "url": "https://www.anchorterminal.com/compare/sendblue-vs-sinch" }, "tokens": { "markdown": 2450, "slim": 680 }, "version": 1 }