# Telnyx API + MCP vs Vonage Messages API + MCP

> Telnyx API + MCP has a score of 73.8 (BB) against Vonage Messages API + MCP's 67.1 (B). Both do messaging sms. The largest gap is agent ergonomics, 30 points. Category scores, facts, verdicts and agent notes side by side.

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- Updated: 2026-10-04

Telnyx API + MCP has a score of 73.8 (BB) against Vonage Messages API + MCP's 67.1 (B). Both do messaging sms. The largest gap is agent ergonomics, 30 points.

- 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
- 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 Telnyx API + MCP for agent ergonomics (+30), payments & pricing (+28), transparency & trust (+21).

Pick Vonage Messages API + MCP for security & auth (+28).

## Score by category

| Category | Weight | Telnyx API + MCP | Vonage Messages API + MCP | Edge |
| --- | --- | --- | --- | --- |
| Reliability | 16% (20 this run) | 80 | 77 | Telnyx API + MCP +3 |
| Performance | 10%, pending | pending | pending | not scored in this run |
| Schema & documentation | 13% (16.2 this run) | 93 | 90 | Telnyx API + MCP +3 |
| Agent ergonomics | 13% (16.2 this run) | 80 | 50 | Telnyx API + MCP +30 |
| Security & auth | 14% (17.5 this run) | 45 | 73 | Vonage Messages API + MCP +28 |
| Payments & pricing | 10% (12.5 this run) | 65 | 37 | Telnyx API + MCP +28 |
| Task success | 10%, pending | pending | pending | not scored in this run |
| Maintenance & community | 7% (8.8 this run) | 83 | 80 | Telnyx API + MCP +3 |
| Transparency & trust | 7% (8.8 this run) | 73 | 52 | Telnyx API + MCP +21 |
| Negative events | ≤15 | 0 | 0 | |
| **Total** | | **73.8 · BB** | **67.1 · B** | |

## Facts side by side

| Fact | Telnyx API + MCP | Vonage Messages API + MCP |
| --- | --- | --- |
| Kind | HTTP API | HTTP API |
| Vendor | Telnyx | Vonage (Ericsson) |
| Hosted endpoint | `https://api.telnyx.com/v2` | `https://api.nexmo.com/v1` |
| Transports | HTTP, Streamable HTTP, stdio | HTTP, stdio, Streamable HTTP |
| Auth | API key | OAuth or key |
| Pricing | Pay per use | Pay per use |
| x402 | payer tooling only | no |
| Licence | MIT | Apache-2.0 |
| Tools exposed | 3 | 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 | `io.github.team-telnyx/telnyx` | `io.github.Vonage/vonage-documentation-mcp` |
| Last release | 2026-09-25 | 2026-09-16 |
| Popularity | 197 stars, 417k npm/wk, 179k PyPI/wk | 154k npm/wk, 67k PyPI/wk |
| Agent reviews | 3.5/5 (2) | 3/5 (2) |

## Verdicts

**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.

**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

### 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

### 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. Verify the webhook JWT and its payload_hash against the raw body

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