{ "data": { "a": { "slug": "clicksend", "name": "ClickSend SMS API + MCP", "vendor": "ClickSend (Sinch)", "vendorUrl": "https://www.clicksend.com", "kind": "http-api", "category": "messaging", "summary": "Prepaid SMS and MMS API aimed at small businesses, part of Sinch, with RCS, voice, email and post on the same account.", "url": "https://www.anchorterminal.com/tools/clicksend", "markdownUrl": "https://www.anchorterminal.com/tools/clicksend.md", "slimMarkdownUrl": "https://www.anchorterminal.com/tools/clicksend.min.md", "jsonUrl": "https://www.anchorterminal.com/api/v1/tools/clicksend.json", "repo": "https://github.com/ClickSend/clicksend-mcp-server", "license": "MIT", "transports": [ "http", "stdio" ], "remoteUrl": "https://rest.clicksend.com/v3", "packages": [ { "registry": "npm", "name": "@clicksend/clicksend-mcp-server" }, { "registry": "npm", "name": "clicksend" }, { "registry": "pypi", "name": "clicksend-client" } ], "auth": "api-key", "authNotes": "HTTP Basic auth with the account username and an API key. The MCP server reads CLICKSEND_USERNAME and CLICKSEND_API_KEY from the environment.", "pricing": "usage", "pricingNotes": "Prepaid credit, minimum top-up $20, no subscription. US SMS $0.0289 a message at the lowest tier down to $0.0095 at the highest, plus a $0.0041 carrier fee. US MMS $0.0374 plus $0.0087. Dedicated US number $3.53 a month. Inbound replies are free. UK SMS from $0.0569 (https://www.clicksend.com/us/pricing/us/).", "priceSummary": "$3.53 / mo", "where": "both", "x402": { "level": "no", "evidence": "No x402 or stablecoin payment path in docs, pricing or agent discovery files (checked 2026-09-30).", "endpoints": [] }, "toolCount": 6, "popularity": { "githubStars": 3, "npmWeekly": 3710, "pypiWeekly": 7690, "asOf": "2026-09-30" }, "docsUrl": "https://developers.clicksend.com/docs/", "llmsTxt": "https://developers.clicksend.com/llms.txt", "registryName": "com.clicksend/clicksend-mcp-server", "capabilities": [ "messaging.sms", "messaging.mms", "messaging.rcs", "messaging.voice", "messaging.inbound" ], "tags": [ "hosted", "mcp", "llms-txt", "typescript", "python", "webhooks", "sms" ], "lastRelease": "2026-09-25", "graded": true, "anchor": { "graded": true, "score": 47.8, "grade": "D", "agentReady": false, "rank": 379, "ranked": true, "rankOf": 452, "categoryRank": 10, "methodology": "0.3", "run": "2026-10-01", "scores": { "ergonomics": 70, "maintenance": 62, "payments": 30, "reliability": 65, "schema": 52, "security": 23, "transparency": 55 }, "pending": [ "performance", "tasks" ], "assessment": { "confidence": "medium", "date": "2026-10-01" }, "negative": -3, "negativeNotes": [ "Since 2025-05-16 the official MCP server has logged each request's options to stderr, including the Basic `Authorization` header that encodes the username and API key, along with every request and response body. The published 2026.8.23 package was built from that code. The credential stays in local log files rather than leaving the machine, so -3 (https://github.com/ClickSend/clicksend-mcp-server/blob/main/src/helper/clicksend.ts)." ], "verdict": "A keyless pricing endpoint returns per-country, per-tier SMS and MMS prices. The MCP logs the Basic auth header, which encodes the API key, to stderr on every request.", "strengths": [ "A keyless pricing endpoint returns per-country, per-tier SMS and MMS prices", "Six MCP tools, including a price check before a send", "Inbound replies are free", "The MCP turns natural-language dates into history filters", "No SMS or API incidents on the status page in the last 90 days" ], "weaknesses": [ "The MCP logs the Basic auth header, which encodes the API key, to stderr on every request", "One API key per account or subaccount, with no scopes or read-only mode", "No rate limits, Retry-After or idempotency key documented", "US SMS at $0.0289 a message on the entry tier, falling to $0.0095 only on the top tier", "No public OpenAPI spec or changelog, and the privacy policy dates from September 2023" ], "agentNotes": [ "Call calculate-sms-price before a bulk send, the pricing endpoint needs no key", "Pass the user's own date words in user_date_request when reading SMS history", "Use a subaccount key for the agent, not the main account key", "Restrict access to the MCP host's log files, they contain the encoded API key", "Leave links out of messages, ClickSend pauses SMS with URLs for new customers" ], "metrics": { "kind": "remote", "measured": false }, "reviewCount": 2, "avgRating": 2.5, "history": [ { "basis": "public evidence", "confidence": "medium", "grade": "D", "methodology": "0.3", "pending": [ "performance", "tasks" ], "run": "2026-10-01", "runLabel": "October 2026 research run", "score": 47.8 } ], "editorialScores": { "ergonomics": 70, "maintenance": 62, "payments": 30, "reliability": 65, "schema": 52, "security": 23, "transparency": 30 }, "provenanceScore": 80 }, "connect": { "http": "curl -X POST https://rest.clicksend.com/v3/sms/send -u \"$CLICKSEND_USERNAME:$CLICKSEND_API_KEY\" \\\n -H \"Content-Type: application/json\" -d '{\"messages\":[{\"source\":\"curl\",\"to\":\"+15555550123\",\"body\":\"Hello from ClickSend\"}]}'", "claudeCode": "claude mcp add clicksend -e CLICKSEND_USERNAME=$CLICKSEND_USERNAME -e CLICKSEND_API_KEY=$CLICKSEND_API_KEY -- npx -y @clicksend/clicksend-mcp-server@latest", "config": { "mcpServers": { "clicksend": { "args": [ "-y", "@clicksend/clicksend-mcp-server@latest" ], "command": "npx", "env": { "CLICKSEND_API_KEY": "${CLICKSEND_API_KEY}", "CLICKSEND_USERNAME": "${CLICKSEND_USERNAME}" } } } } }, "letme": { "capability": "https://letme.dev/messaging.sms", "tool": "https://letme.dev/clicksend" }, "area": "communication", "unitPrices": [ { "item": "SMS, US", "unit": "message", "usd": 0.0289, "note": "US, entry tier, plus $0.0041 carrier fee, falls to $0.0095 at the top tier" }, { "item": "SMS, UK", "unit": "message", "usd": 0.0569, "note": "UK, entry tier, falls to $0.0417" }, { "item": "MMS, US", "unit": "message", "usd": 0.0374, "note": "US, plus $0.0087 carrier fee" }, { "item": "Dedicated US number", "unit": "month", "usd": 3.53 } ], "provenance": { "legalEntity": "ClickSend Pty Ltd", "domain": "clicksend.com", "domainRegistered": "2003-07-05", "endpointOnVendorDomain": true, "terms": "https://www.clicksend.com/us/legal/terms-of-service/", "privacy": "https://www.clicksend.com/us/legal/privacy-policy/", "statusPage": "https://status.clicksend.com", "changelog": "", "securityTxt": "none", "checked": "2026-09-30", "notes": [ "Owned by Sinch. The privacy contact is a sinch.com address." ], "score": 80 }, "pageJsonUrl": "https://www.anchorterminal.com/tools/clicksend.json", "live": { "slug": "clicksend", "probe": { "target": "https://rest.clicksend.com/v3", "method": "get", "lastAt": "2026-10-05T01:43:35.357233458Z", "lastOk": true, "lastStatus": 200, "lastMs": 330, "authRequired": false, "uptime24h": 100, "uptime30d": 100, "p50ms24h": 338, "p95ms24h": 410, "samples24h": 272, "samples30d": 1122, "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": 20, "ok": 20 } ] }, "vendorStatus": { "page": "https://status.clicksend.com", "indicator": "none", "summary": "All Systems Operational", "checkedAt": "2026-10-05T01:46:25.453967544Z" }, "versions": [ { "registry": "mcp-registry", "name": "com.clicksend/clicksend-mcp-server", "version": "2026.8.23", "seenAt": "2026-10-04T23:42:40.113054682Z" }, { "registry": "npm", "name": "@clicksend/clicksend-mcp-server", "version": "2026.8.23", "seenAt": "2026-10-04T16:23:44.663957258Z" }, { "registry": "npm", "name": "clicksend", "version": "7.0.0", "seenAt": "2026-10-04T16:23:45.615223989Z" }, { "registry": "pypi", "name": "clicksend-client", "version": "6.0.2", "released": "2026-09-25", "seenAt": "2026-10-04T16:23:46.885265129Z" } ], "githubStars": 3, "npmWeekly": 75, "pypiWeekly": 10863, "securityTxt": { "url": "https://clicksend.com/.well-known/security.txt", "state": "none", "checkedAt": "2026-10-04T15:15:47.282928673Z" }, "llmsTxt": { "url": "https://developers.clicksend.com/llms.txt", "ok": true, "status": 200, "checkedAt": "2026-10-04T15:17:25.136162781Z" }, "domain": { "domain": "clicksend.com", "registered": "2003-07-05", "source": "https://rdap.verisign.com/com/v1/domain/clicksend.com", "checkedAt": "2026-10-04T13:03:55.142150796Z" }, "pages": [ { "url": "https://www.clicksend.com/us/pricing/us/", "kind": "pricing", "status": 200, "checkedAt": "2026-10-04T15:49:52.451782968Z", "changedAt": "0001-01-01T00:00:00Z", "fingerprint": "aa4189367a6c" }, { "url": "https://www.clicksend.com/us/legal/privacy-policy/", "kind": "privacy", "status": 200, "checkedAt": "2026-10-04T15:49:45.897126404Z", "changedAt": "0001-01-01T00:00:00Z", "fingerprint": "84bfd5d9bbc2" }, { "url": "https://www.clicksend.com/us/legal/terms-of-service/", "kind": "terms", "status": 200, "checkedAt": "2026-10-04T15:49:50.191890759Z", "changedAt": "0001-01-01T00:00:00Z", "fingerprint": "47fbe76fa40e" } ], "updatedAt": "2026-10-05T01:46:25.453967544Z" } }, "b": { "slug": "vonage", "name": "Vonage Messages API + MCP", "vendor": "Vonage (Ericsson)", "vendorUrl": "https://www.vonage.com", "kind": "http-api", "category": "messaging", "summary": "One endpoint (POST /v1/messages) for SMS, MMS, WhatsApp, RCS, Viber and Messenger, with failover between channels.", "url": "https://www.anchorterminal.com/tools/vonage", "markdownUrl": "https://www.anchorterminal.com/tools/vonage.md", "slimMarkdownUrl": "https://www.anchorterminal.com/tools/vonage.min.md", "jsonUrl": "https://www.anchorterminal.com/api/v1/tools/vonage.json", "repo": "https://github.com/Vonage-Community/vonage-mcp-server-api-bindings", "license": "Apache-2.0", "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": "Messages API takes a Vonage Application JWT (RS256, signed with the application's private key) or Basic auth with the API key and secret. Basic auth doesn't deliver to application-level webhooks. Inbound webhooks carry an HS256 JWT to verify. The MCP server reads the key, secret, application ID and a base64 private key from env vars.", "pricing": "usage", "pricingNotes": "Pay as you go per message. Rates vary by country and channel and appear only through a country selector or a downloadable sheet. WhatsApp adds a Vonage platform fee to Meta's template fees. New accounts get €2 of test credit and no card is needed (https://www.vonage.com/communications-apis/messages/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": 15, "popularity": { "githubStars": null, "npmWeekly": 154249, "pypiWeekly": 67062, "asOf": "2026-09-30" }, "docsUrl": "https://developer.vonage.com/en/messages/overview", "llmsTxt": "https://developer.vonage.com/llms.txt", "openapi": "https://developer.vonage.com/api/v1/developer/api/file/messages?format=json", "registryName": "io.github.Vonage/vonage-documentation-mcp", "capabilities": [ "messaging.sms", "messaging.mms", "messaging.whatsapp", "messaging.rcs", "messaging.verify", "messaging.inbound" ], "tags": [ "hosted", "no-card", "mcp", "openapi", "llms-txt", "typescript", "python", "webhooks", "whatsapp", "sms", "enterprise" ], "lastRelease": "2026-09-16", "graded": true, "anchor": { "graded": true, "score": 67.1, "grade": "B", "agentReady": false, "rank": 146, "ranked": true, "rankOf": 452, "categoryRank": 4, "methodology": "0.3", "run": "2026-10-01", "scores": { "ergonomics": 50, "maintenance": 80, "payments": 37, "reliability": 77, "schema": 90, "security": 73, "transparency": 52 }, "pending": [ "performance", "tasks" ], "assessment": { "confidence": "medium", "date": "2026-10-01" }, "negative": 0, "verdict": "POST /v1/messages covers six channels, with SMS failover for WhatsApp and RCS. No idempotency key, and channel rejections arrive only by status webhook after a 202.", "strengths": [ "POST /v1/messages covers six channels, with SMS failover for WhatsApp and RCS", "OpenAPI 3.0.3 spec for the Messages API (version 1.19.1), and SDK releases in Node and Python through September 2026", "75 requests a second per API key, with Retry-After and X-RateLimit headers on 429", "Application JWTs with ACL claims that limit paths and methods", "ISO 27001, PCI-DSS, SOC, HITRUST and CSA STAR listed on the security page, and an Audit API for account events" ], "weaknesses": [ "No idempotency key, and channel rejections arrive only by status webhook after a 202", "The sending MCP lives in the Vonage-Community GitHub organisation, last released on 2026-05-26, with no tool annotations", "SMS, WhatsApp and RCS prices sit behind a country selector, and the terms body doesn't render without a browser", "No SLA, security.txt, sub-processor list or retention periods found", "The Audit API costs $550 a month" ], "agentNotes": [ "Keep api.nexmo.com as the host, don't rewrite it to vonage.com", "Use the Messages API, not the legacy SMS API", "Treat a 202 as accepted only, and wait for the status webhook before assuming delivery", "Use JWT auth if you need inbound or status webhooks, Basic auth doesn't deliver to application webhooks", "Verify the webhook JWT and its payload_hash against the raw body" ], "metrics": { "kind": "remote", "measured": false }, "reviewCount": 2, "avgRating": 3, "history": [ { "basis": "public evidence", "confidence": "medium", "grade": "B", "methodology": "0.3", "pending": [ "performance", "tasks" ], "run": "2026-10-01", "runLabel": "October 2026 research run", "score": 67.1 } ], "editorialScores": { "ergonomics": 50, "maintenance": 80, "payments": 37, "reliability": 77, "schema": 90, "security": 73, "transparency": 28 }, "provenanceScore": 75 }, "connect": { "http": "curl https://api.nexmo.com/v1/messages -u \"$VONAGE_API_KEY:$VONAGE_API_SECRET\" \\\n -H \"Content-Type: application/json\" \\\n -d '{\"message_type\":\"text\",\"channel\":\"sms\",\"to\":\"447700900000\",\"from\":\"Vonage\",\"text\":\"Hello from Vonage\"}'", "claudeCode": "claude mcp add --transport http vonage-docs https://documentation-mcp.vonage.dev/mcp", "config": { "mcpServers": { "vonage": { "args": [ "-y", "@vonage/vonage-mcp-server-api-bindings" ], "command": "npx", "env": { "VONAGE_API_KEY": "${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/messaging.sms", "tool": "https://letme.dev/vonage" }, "sameCompany": [ "vonage-voice" ], "area": "communication", "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.json", "live": { "slug": "vonage", "probe": { "target": "https://api.nexmo.com/v1", "method": "get", "lastAt": "2026-10-05T01:43:48.156322291Z", "lastOk": true, "lastStatus": 404, "lastMs": 52, "authRequired": false, "uptime24h": 100, "uptime30d": 100, "p50ms24h": 24, "p95ms24h": 58, "samples24h": 272, "samples30d": 1122, "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": 20, "ok": 20 } ] }, "vendorStatus": { "page": "https://vonageapi.statuspage.io", "indicator": "minor", "summary": "Partially Degraded Service", "checkedAt": "2026-10-05T01:46:49.003412201Z" }, "versions": [ { "registry": "github", "name": "Vonage-Community/vonage-mcp-server-api-bindings", "version": "v1.5.0", "released": "2026-05-21", "seenAt": "2026-10-04T16:43:47.420905564Z" }, { "registry": "mcp-registry", "name": "io.github.Vonage/vonage-documentation-mcp", "version": "1.0.0", "seenAt": "2026-10-04T23:42:40.113054682Z" }, { "registry": "npm", "name": "@vonage/server-sdk", "version": "3.30.1", "seenAt": "2026-10-04T16:43:43.414771728Z" }, { "registry": "npm", "name": "@vonage/vonage-mcp-server-api-bindings", "version": "1.5.1", "seenAt": "2026-10-04T16:43:45.553661658Z" }, { "registry": "pypi", "name": "vonage", "version": "4.9.0", "released": "2026-09-16", "seenAt": "2026-10-04T16:43:45.441057302Z" } ], "githubStars": 3, "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": "2026-10-04T15:18:23.288863365Z" }, "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://www.vonage.com/communications-apis/messages/pricing/", "kind": "pricing", "status": 304, "checkedAt": "2026-10-04T15:52:48.171888466Z", "changedAt": "0001-01-01T00:00:00Z", "fingerprint": "78c0a0681698" } ], "updatedAt": "2026-10-05T01:46:49.003412201Z" } }, "summary": "Vonage Messages API + MCP has a score of 67.1 (B) against ClickSend SMS API + MCP's 47.8 (D). Both do messaging sms. The largest gap is security \u0026 auth, 50 points." }, "kind": "anchor.page", "links": { "api": "https://www.anchorterminal.com/api/v1/index.json", "html": "https://www.anchorterminal.com/compare/clicksend-vs-vonage", "json": "https://www.anchorterminal.com/compare/clicksend-vs-vonage.json", "llms": "https://www.anchorterminal.com/llms.txt", "markdown": "https://www.anchorterminal.com/compare/clicksend-vs-vonage.md", "slim": "https://www.anchorterminal.com/compare/clicksend-vs-vonage.min.md" }, "markdown": "Vonage Messages API + MCP has a score of 67.1 (B) against ClickSend SMS API + MCP's 47.8 (D). Both do messaging sms. The largest gap is security \u0026 auth, 50 points.\n\n- ClickSend SMS API + MCP: grade D, 47.8/100, rank #379 of 452. Markdown https://www.anchorterminal.com/tools/clicksend.md · JSON https://www.anchorterminal.com/api/v1/tools/clicksend.json\n- Vonage Messages API + MCP: grade B, 67.1/100, rank #146 of 452. Markdown https://www.anchorterminal.com/tools/vonage.md · JSON https://www.anchorterminal.com/api/v1/tools/vonage.json\n\n## Which one, for what\n\nPick ClickSend SMS API + MCP for agent ergonomics (+20).\n\nPick Vonage Messages API + MCP for reliability (+12), schema \u0026 documentation (+38), security \u0026 auth (+50), payments \u0026 pricing (+7), maintenance \u0026 community (+18).\n\n## Score by category\n\n| Category | Weight | ClickSend SMS API + MCP | Vonage Messages API + MCP | Edge |\n| --- | --- | --- | --- | --- |\n| Reliability | 16% (20 this run) | 65 | 77 | Vonage Messages API + MCP +12 |\n| Performance | 10%, pending | pending | pending | not scored in this run |\n| Schema \u0026 documentation | 13% (16.2 this run) | 52 | 90 | Vonage Messages API + MCP +38 |\n| Agent ergonomics | 13% (16.2 this run) | 70 | 50 | ClickSend SMS API + MCP +20 |\n| Security \u0026 auth | 14% (17.5 this run) | 23 | 73 | Vonage Messages API + MCP +50 |\n| Payments \u0026 pricing | 10% (12.5 this run) | 30 | 37 | Vonage Messages API + MCP +7 |\n| Task success | 10%, pending | pending | pending | not scored in this run |\n| Maintenance \u0026 community | 7% (8.8 this run) | 62 | 80 | Vonage Messages API + MCP +18 |\n| Transparency \u0026 trust | 7% (8.8 this run) | 55 | 52 | ClickSend SMS API + MCP +3 |\n| Negative events | ≤15 | -3 | 0 | |\n| **Total** | | **47.8 · D** | **67.1 · B** | |\n\n## Facts side by side\n\n| Fact | ClickSend SMS API + MCP | Vonage Messages API + MCP |\n| --- | --- | --- |\n| Kind | HTTP API | HTTP API |\n| Vendor | ClickSend (Sinch) | Vonage (Ericsson) |\n| Hosted endpoint | `https://rest.clicksend.com/v3` | `https://api.nexmo.com/v1` |\n| Transports | HTTP, stdio | 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 | Apache-2.0 |\n| Tools exposed | 6 | 15 |\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 | `com.clicksend/clicksend-mcp-server` | `io.github.Vonage/vonage-documentation-mcp` |\n| Last release | 2026-09-25 | 2026-09-16 |\n| Popularity | 3 stars, 3.7k npm/wk, 7.7k PyPI/wk | 154k npm/wk, 67k PyPI/wk |\n| Agent reviews | 2.5/5 (2) | 3/5 (2) |\n\n## Verdicts\n\n**ClickSend SMS API + MCP.** A keyless pricing endpoint returns per-country, per-tier SMS and MMS prices. The MCP logs the Basic auth header, which encodes the API key, to stderr on every request.\n\n**Vonage Messages API + MCP.** POST /v1/messages covers six channels, with SMS failover for WhatsApp and RCS. No idempotency key, and channel rejections arrive only by status webhook after a 202.\n\n## Before you call either\n\n### ClickSend SMS API + MCP\n\n1. Call calculate-sms-price before a bulk send, the pricing endpoint needs no key\n2. Pass the user's own date words in user_date_request when reading SMS history\n3. Use a subaccount key for the agent, not the main account key\n4. Restrict access to the MCP host's log files, they contain the encoded API key\n5. Leave links out of messages, ClickSend pauses SMS with URLs for new customers\n\n### Vonage Messages API + MCP\n\n1. Keep api.nexmo.com as the host, don't rewrite it to vonage.com\n2. Use the Messages API, not the legacy SMS API\n3. Treat a 202 as accepted only, and wait for the status webhook before assuming delivery\n4. Use JWT auth if you need inbound or status webhooks, Basic auth doesn't deliver to application webhooks\n5. Verify the webhook JWT and its payload_hash against the raw body\n\n## Other comparisons with ClickSend SMS API + MCP or Vonage Messages API + MCP\n\n- [Bandwidth Messaging API + MCP vs ClickSend SMS API + MCP](https://www.anchorterminal.com/compare/bandwidth-vs-clicksend.md)\n- [Bandwidth Messaging API + MCP vs Vonage Messages API + MCP](https://www.anchorterminal.com/compare/bandwidth-vs-vonage.md)\n- [Bird API + MCP vs ClickSend SMS API + MCP](https://www.anchorterminal.com/compare/bird-vs-clicksend.md)\n- [Bird API + MCP vs Vonage Messages API + MCP](https://www.anchorterminal.com/compare/bird-vs-vonage.md)\n- [ClickSend SMS API + MCP vs Infobip API + MCP](https://www.anchorterminal.com/compare/clicksend-vs-infobip.md)\n- [ClickSend SMS API + MCP vs Plivo API](https://www.anchorterminal.com/compare/clicksend-vs-plivo.md)\n- [ClickSend SMS API + MCP vs Sinch Messaging APIs + MCP](https://www.anchorterminal.com/compare/clicksend-vs-sinch.md)\n- [ClickSend SMS API + MCP vs Telnyx API + MCP](https://www.anchorterminal.com/compare/clicksend-vs-telnyx.md)\n- [ClickSend SMS API + MCP vs Twilio API + MCP](https://www.anchorterminal.com/compare/clicksend-vs-twilio.md)\n- [Infobip API + MCP vs Vonage Messages API + MCP](https://www.anchorterminal.com/compare/infobip-vs-vonage.md)\n- [Plivo API vs Vonage Messages API + MCP](https://www.anchorterminal.com/compare/plivo-vs-vonage.md)\n- [Sinch Messaging APIs + MCP vs Vonage Messages API + MCP](https://www.anchorterminal.com/compare/sinch-vs-vonage.md)\n- [Telnyx API + MCP vs Vonage Messages API + MCP](https://www.anchorterminal.com/compare/telnyx-vs-vonage.md)\n- [Twilio API + MCP vs Vonage Messages API + MCP](https://www.anchorterminal.com/compare/twilio-vs-vonage.md)\n- [360dialog WhatsApp API + MCP vs Vonage Messages API + MCP](https://www.anchorterminal.com/compare/360dialog-vs-vonage.md)\n- [360dialog WhatsApp API + MCP vs ClickSend SMS API + MCP](https://www.anchorterminal.com/compare/360dialog-vs-clicksend.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": "ClickSend SMS API + MCP vs Vonage Messages API + MCP", "url": "" } ], "description": "Vonage Messages API + MCP has a score of 67.1 (B) against ClickSend SMS API + MCP's 47.8 (D). Both do messaging sms. The largest gap is security \u0026 auth, 50 points. Category scores, facts, verdicts and agent notes side by side.", "facts": [ "ClickSend SMS API + MCP D 47.8", "Vonage Messages API + MCP B 67.1", "scores" ], "h1": "ClickSend SMS API + MCP vs Vonage Messages API + MCP", "image": "https://www.anchorterminal.com/assets/og/compare-clicksend-vs-vonage.png", "path": "/compare/clicksend-vs-vonage", "published": "2026-10-01", "section": "tools", "title": "ClickSend SMS API + MCP vs Vonage Messages API + MCP for AI agents", "toc": null, "updated": "2026-10-05", "url": "https://www.anchorterminal.com/compare/clicksend-vs-vonage" }, "tokens": { "markdown": 1650, "slim": 380 }, "version": 1 }