# ClickSend SMS API + MCP vs Sinch Messaging APIs + MCP

> Sinch Messaging APIs + MCP has a score of 63.3 (B) against ClickSend SMS API + MCP's 47.8 (D). Both do messaging sms. The largest gap is schema & documentation, 29 points. Category scores, facts, verdicts and agent notes side by side.

- Canonical: https://www.anchorterminal.com/compare/clicksend-vs-sinch
- Markdown: https://www.anchorterminal.com/compare/clicksend-vs-sinch.md (~1,650 tokens)
- Slim: https://www.anchorterminal.com/compare/clicksend-vs-sinch.min.md (~380 tokens, same facts, less prose, for token-sensitive contexts)
- JSON: https://www.anchorterminal.com/compare/clicksend-vs-sinch.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

Sinch Messaging APIs + MCP has a score of 63.3 (B) against ClickSend SMS API + MCP's 47.8 (D). Both do messaging sms. The largest gap is schema & documentation, 29 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
- Sinch Messaging APIs + MCP: grade B, 63.3/100, rank #206 of 452. Markdown https://www.anchorterminal.com/tools/sinch.md · JSON https://www.anchorterminal.com/api/v1/tools/sinch.json

## Which one, for what

Pick ClickSend SMS API + MCP for agent ergonomics (+20).

Pick Sinch Messaging APIs + MCP for reliability (+8), schema & documentation (+29), security & auth (+27), payments & pricing (+10), maintenance & community (+21), transparency & trust (+18).

## Score by category

| Category | Weight | ClickSend SMS API + MCP | Sinch Messaging APIs + MCP | Edge |
| --- | --- | --- | --- | --- |
| Reliability | 16% (20 this run) | 65 | 73 | Sinch Messaging APIs + MCP +8 |
| Performance | 10%, pending | pending | pending | not scored in this run |
| Schema & documentation | 13% (16.2 this run) | 52 | 81 | Sinch Messaging APIs + MCP +29 |
| Agent ergonomics | 13% (16.2 this run) | 70 | 50 | ClickSend SMS API + MCP +20 |
| Security & auth | 14% (17.5 this run) | 23 | 50 | Sinch Messaging APIs + MCP +27 |
| Payments & pricing | 10% (12.5 this run) | 30 | 40 | Sinch Messaging APIs + MCP +10 |
| Task success | 10%, pending | pending | pending | not scored in this run |
| Maintenance & community | 7% (8.8 this run) | 62 | 83 | Sinch Messaging APIs + MCP +21 |
| Transparency & trust | 7% (8.8 this run) | 55 | 73 | Sinch Messaging APIs + MCP +18 |
| Negative events | ≤15 | -3 | 0 | |
| **Total** | | **47.8 · D** | **63.3 · B** | |

## Facts side by side

| Fact | ClickSend SMS API + MCP | Sinch Messaging APIs + MCP |
| --- | --- | --- |
| Kind | HTTP API | HTTP API |
| Vendor | ClickSend (Sinch) | Sinch |
| Hosted endpoint | `https://rest.clicksend.com/v3` | `https://us.sms.api.sinch.com/xms/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 | 54 |
| 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` | not listed |
| Last release | 2026-09-25 | 2026-09-23 |
| Popularity | 3 stars, 3.7k npm/wk, 7.7k PyPI/wk | 1 stars, 16k npm/wk, 11k 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.

**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.

## 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

### Sinch Messaging APIs + MCP

1. Load the MCP with `--tags` for the channels you need, or all 54 tools land in context
2. Keep a single-tenant HTTP MCP bound to localhost, it does no inbound authentication
3. Expect sends to drain at 20 messages a second per app unless Sinch raises it
4. Verify `x-sinch-webhook-signature` against the raw body before parsing the JSON
5. Use the regional base URL (us, eu or br) that matches the project

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