Category
SMS & Messaging APIs pricing
SMS & messaging APIs let developers send programmatic text (SMS/MMS), and increasingly WhatsApp, RCS and OTP/verification, over carrier networks. The category splits into full-stack CPaaS incumbents (Twilio, Vonage, Sinch) that bundle deep docs, omnichannel and enterprise compliance; price-led carrier-network challengers (Telnyx, Plivo, Bandwidth) that own infrastructure and undercut on per-message cost; a cheap rebranded challenger (Bird/MessageBird); and the hyperscaler option (AWS). Compare on documentation/DX quality, proven reliability and SLAs, breadth of official SDKs and ecosystem, and how fast a developer or AI agent can self-serve a working key.
| API | Billed by | Free tier | Verified |
|---|---|---|---|
 Twilio SMS & Messaging APIs | Per SMS segment | Free tier or trial | Jun 27, 2026 |
 Vonage SMS & Messaging APIs | Per SMS message | Free tier or trial | Jun 27, 2026 |
 Telnyx SMS & Messaging APIs | Per SMS segment | Free tier or trial | Jun 27, 2026 |
 Plivo SMS & Messaging APIs | Per SMS segment | Free tier or trial | Jun 27, 2026 |
 Sinch SMS & Messaging APIs | Per SMS message | Free tier or trial | Jun 27, 2026 |
 AWS End User Messaging (SNS) SMS & Messaging APIs | Per SMS segment | Free tier or trial | Jun 27, 2026 |
 Bird (MessageBird) SMS & Messaging APIs | Per SMS message | Free tier or trial | Jun 27, 2026 |
 Bandwidth SMS & Messaging APIs | Per SMS message | No free tier | Jun 27, 2026 |