# SMS, WhatsApp and messaging APIs for AI agents (slim)

> 10 messaging APIs ranked by the Anchor benchmark. Leader Twilio API + MCP (A). APIs for SMS, MMS, WhatsApp, RCS and other customer messaging channels. Email and in-app chat are compared separately. Compared on price per message by country, channel coverage, sender registration (10DLC, WhatsApp business verification), inbound webhooks and what an agent needs before it can send its first message.

- Full: https://www.anchorterminal.com/categories/messaging.md (~3,750 tokens) · this version ~580 tokens · JSON https://www.anchorterminal.com/categories/messaging.json · canonical https://www.anchorterminal.com/categories/messaging
- Index: https://www.anchorterminal.com/llms.txt · API: https://www.anchorterminal.com/api/v1/index.json · Updated: 2026-10-05

- Tools: 10 · agent-ready (BB+): 3 · accept x402: 1 · JSON: https://www.anchorterminal.com/api/v1/tools.json · by capability: https://www.anchorterminal.com/api/v1/capabilities.json
- Capabilities: messaging.sms, messaging.mms, messaging.whatsapp, messaging.rcs, messaging.verify, messaging.inbound

| # | Tool | Grade | Score | Confidence | x402 | Auth | Where | Slim |
| --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 5 | Twilio API + MCP | A | 80.4 | medium | no | OAuth or key | hosted + local | https://www.anchorterminal.com/tools/twilio.min.md |
| 17 | Bird API + MCP | BB | 77.7 | medium | no | OAuth or key | hosted + local | https://www.anchorterminal.com/tools/bird.min.md |
| 54 | Telnyx API + MCP | BB | 73.8 | medium | payer | API key | hosted + local | https://www.anchorterminal.com/tools/telnyx.min.md |
| 146 | Vonage Messages API + MCP | B | 67.1 | medium | no | OAuth or key | hosted + local | https://www.anchorterminal.com/tools/vonage.min.md |
| 185 | Bandwidth Messaging API + MCP | B | 64.3 | medium | no | OAuth | hosted + local | https://www.anchorterminal.com/tools/bandwidth.min.md |
| 206 | Sinch Messaging APIs + MCP | B | 63.3 | medium | no | OAuth or key | hosted + local | https://www.anchorterminal.com/tools/sinch.min.md |
| 250 | Plivo API | C | 60.3 | medium | no | API key | hosted | https://www.anchorterminal.com/tools/plivo.min.md |
| 267 | Infobip API + MCP | C | 59.3 | medium | no | OAuth or key | hosted | https://www.anchorterminal.com/tools/infobip.min.md |
| 343 | 360dialog WhatsApp API + MCP | D | 52.2 | medium | no | OAuth or key | hosted | https://www.anchorterminal.com/tools/360dialog.min.md |
| 379 | ClickSend SMS API + MCP | D | 47.8 | medium | no | API key | hosted + local | https://www.anchorterminal.com/tools/clicksend.min.md |