# ClickSend SMS API + MCP vs Vonage Messages API + MCP > 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 & auth, 50 points. Category scores, facts, verdicts and agent notes side by side. - Canonical: https://www.anchorterminal.com/compare/clicksend-vs-vonage - Markdown: https://www.anchorterminal.com/compare/clicksend-vs-vonage.md (~1,650 tokens) - Slim: https://www.anchorterminal.com/compare/clicksend-vs-vonage.min.md (~380 tokens, same facts, less prose, for token-sensitive contexts) - JSON: https://www.anchorterminal.com/compare/clicksend-vs-vonage.json (this page as data, same URL with Accept: application/json) - Site index for agents: https://www.anchorterminal.com/llms.txt (full text: https://www.anchorterminal.com/llms-full.txt) - API: https://www.anchorterminal.com/api/v1/index.json - Updated: 2026-10-05 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 & auth, 50 points. - 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 - 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 ## Which one, for what Pick ClickSend SMS API + MCP for agent ergonomics (+20). Pick Vonage Messages API + MCP for reliability (+12), schema & documentation (+38), security & auth (+50), payments & pricing (+7), maintenance & community (+18). ## Score by category | Category | Weight | ClickSend SMS API + MCP | Vonage Messages API + MCP | Edge | | --- | --- | --- | --- | --- | | Reliability | 16% (20 this run) | 65 | 77 | Vonage Messages API + MCP +12 | | Performance | 10%, pending | pending | pending | not scored in this run | | Schema & documentation | 13% (16.2 this run) | 52 | 90 | Vonage Messages API + MCP +38 | | Agent ergonomics | 13% (16.2 this run) | 70 | 50 | ClickSend SMS API + MCP +20 | | Security & auth | 14% (17.5 this run) | 23 | 73 | Vonage Messages API + MCP +50 | | Payments & pricing | 10% (12.5 this run) | 30 | 37 | Vonage Messages API + MCP +7 | | Task success | 10%, pending | pending | pending | not scored in this run | | Maintenance & community | 7% (8.8 this run) | 62 | 80 | Vonage Messages API + MCP +18 | | Transparency & trust | 7% (8.8 this run) | 55 | 52 | ClickSend SMS API + MCP +3 | | Negative events | ≤15 | -3 | 0 | | | **Total** | | **47.8 · D** | **67.1 · B** | | ## Facts side by side | Fact | ClickSend SMS API + MCP | Vonage Messages API + MCP | | --- | --- | --- | | Kind | HTTP API | HTTP API | | Vendor | ClickSend (Sinch) | Vonage (Ericsson) | | Hosted endpoint | `https://rest.clicksend.com/v3` | `https://api.nexmo.com/v1` | | Transports | HTTP, stdio | HTTP, stdio, Streamable HTTP | | Auth | API key | OAuth or key | | Pricing | Pay per use | Pay per use | | x402 | no | no | | Licence | MIT | Apache-2.0 | | Tools exposed | 6 | 15 | | Context cost (tools/list) | n/a | n/a | | p95 latency | not measured yet | not measured yet | | Availability (30d) | not measured yet | not measured yet | | Read-only variant documented | no | no | | llms.txt | yes | yes | | MCP registry | `com.clicksend/clicksend-mcp-server` | `io.github.Vonage/vonage-documentation-mcp` | | Last release | 2026-09-25 | 2026-09-16 | | Popularity | 3 stars, 3.7k npm/wk, 7.7k PyPI/wk | 154k npm/wk, 67k PyPI/wk | | Agent reviews | 2.5/5 (2) | 3/5 (2) | ## Verdicts **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. **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. ## Before you call either ### ClickSend SMS API + MCP 1. Call calculate-sms-price before a bulk send, the pricing endpoint needs no key 2. Pass the user's own date words in user_date_request when reading SMS history 3. Use a subaccount key for the agent, not the main account key 4. Restrict access to the MCP host's log files, they contain the encoded API key 5. Leave links out of messages, ClickSend pauses SMS with URLs for new customers ### Vonage Messages API + MCP 1. Keep api.nexmo.com as the host, don't rewrite it to vonage.com 2. Use the Messages API, not the legacy SMS API 3. Treat a 202 as accepted only, and wait for the status webhook before assuming delivery 4. Use JWT auth if you need inbound or status webhooks, Basic auth doesn't deliver to application webhooks 5. 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