# ClickSend SMS API + MCP vs Telnyx API + MCP

> Telnyx API + MCP has a score of 73.8 (BB) against ClickSend SMS API + MCP's 47.8 (D). Both do messaging sms. The largest gap is schema & documentation, 41 points. Category scores, facts, verdicts and agent notes side by side.

- Canonical: https://www.anchorterminal.com/compare/clicksend-vs-telnyx
- Markdown: https://www.anchorterminal.com/compare/clicksend-vs-telnyx.md (~1,650 tokens)
- Slim: https://www.anchorterminal.com/compare/clicksend-vs-telnyx.min.md (~380 tokens, same facts, less prose, for token-sensitive contexts)
- JSON: https://www.anchorterminal.com/compare/clicksend-vs-telnyx.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: 2026-10-04

Telnyx API + MCP has a score of 73.8 (BB) against ClickSend SMS API + MCP's 47.8 (D). Both do messaging sms. The largest gap is schema & documentation, 41 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
- Telnyx API + MCP: grade BB, 73.8/100, rank #54 of 452. Markdown https://www.anchorterminal.com/tools/telnyx.md · JSON https://www.anchorterminal.com/api/v1/tools/telnyx.json

## Which one, for what

Pick ClickSend SMS API + MCP for nothing in particular (no category where it leads by five points or more).

Pick Telnyx API + MCP for reliability (+15), schema & documentation (+41), agent ergonomics (+10), security & auth (+22), payments & pricing (+35), maintenance & community (+21), transparency & trust (+18).

## Score by category

| Category | Weight | ClickSend SMS API + MCP | Telnyx API + MCP | Edge |
| --- | --- | --- | --- | --- |
| Reliability | 16% (20 this run) | 65 | 80 | Telnyx API + MCP +15 |
| Performance | 10%, pending | pending | pending | not scored in this run |
| Schema & documentation | 13% (16.2 this run) | 52 | 93 | Telnyx API + MCP +41 |
| Agent ergonomics | 13% (16.2 this run) | 70 | 80 | Telnyx API + MCP +10 |
| Security & auth | 14% (17.5 this run) | 23 | 45 | Telnyx API + MCP +22 |
| Payments & pricing | 10% (12.5 this run) | 30 | 65 | Telnyx API + MCP +35 |
| Task success | 10%, pending | pending | pending | not scored in this run |
| Maintenance & community | 7% (8.8 this run) | 62 | 83 | Telnyx API + MCP +21 |
| Transparency & trust | 7% (8.8 this run) | 55 | 73 | Telnyx API + MCP +18 |
| Negative events | ≤15 | -3 | 0 | |
| **Total** | | **47.8 · D** | **73.8 · BB** | |

## Facts side by side

| Fact | ClickSend SMS API + MCP | Telnyx API + MCP |
| --- | --- | --- |
| Kind | HTTP API | HTTP API |
| Vendor | ClickSend (Sinch) | Telnyx |
| Hosted endpoint | `https://rest.clicksend.com/v3` | `https://api.telnyx.com/v2` |
| Transports | HTTP, stdio | HTTP, Streamable HTTP, stdio |
| Auth | API key | API key |
| Pricing | Pay per use | Pay per use |
| x402 | no | payer tooling only |
| Licence | MIT | MIT |
| Tools exposed | 6 | 3 |
| 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.team-telnyx/telnyx` |
| Last release | 2026-09-25 | 2026-09-25 |
| Popularity | 3 stars, 3.7k npm/wk, 7.7k PyPI/wk | 197 stars, 417k npm/wk, 179k PyPI/wk |
| Agent reviews | 2.5/5 (2) | 3.5/5 (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.

**Telnyx API + MCP.** US long code SMS $0.004 a part outbound and inbound, published with carrier fees and as machine-readable pricing.md. No per-key scopes or read-only keys, and the MCP can send or buy numbers without confirmation.

## 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

### Telnyx API + MCP

1. Register the 10DLC brand ($4.50) and campaign ($10 a month) before sending US long code traffic
2. Back off on error 10011 for as long as the Retry-After header says
3. Call get_api_endpoint_schema before invoke_api_endpoint, the schemas aren't in the tool list
4. Give each agent its own key, since keys can't be scoped
5. Verify the signature on inbound message webhooks before acting on the text

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