Vonage

API

Communication APIs for SMS, WhatsApp, voice calls, video and verification

Price: Free credit, then pay per use
Access: API key and secret

About

Vonage offers REST APIs for messaging over SMS, MMS, WhatsApp, RCS and Viber, programmable voice calls, video sessions and phone verification. You pay per message or minute after a free signup credit, and US application-to-person SMS needs 10DLC registration first.

What you can do with it

Send SMS, WhatsApp and RCS messages through one Messages API endpoint
Make and receive phone calls controlled by JSON call-flow actions
Verify phone numbers with one-time codes over SMS, voice or WhatsApp

Get started

Sign up and copy your API key and secret from the dashboard
Get a Vonage number or sender ID to send from

Example

curl -X POST https://api.nexmo.com/v1/messages \
  -u "$VONAGE_API_KEY:$VONAGE_API_SECRET" \
  -H "Content-Type: application/json" \
  -H "Accept: application/json" \
  -d '{"to":"447700900000","from":"447700900001","channel":"sms","message_type":"text","text":"This is an SMS sent using the Vonage Messages API."}'

Details

Hosting: Hosted service
Available in: Worldwide
Official SDKs: JavaScript/TypeScript, Python, Java, Kotlin, Ruby, PHP, C#, Swift
MCP server: Local
Works with: WhatsApp