SMS, chat and notifications for AI agents
3 APIs compared on price, free tier, MCP support and real usage. Prices from the vendors' pricing pages, checked Oct 9, 2026.
| API | Free | Price | SDK downloads / wk | GitHub stars | MCP |
|---|---|---|---|---|---|
| Pusher Beams Programmatic push notifications service for scalable realtime messaging. |
1,000 subscribers | Free plan · paid from $29/mo | — | — | |
| Svix Webhook infrastructure service for sending, receiving, and testing webhooks at scale. |
Up to 50k messages per month | $0.1 / 1k requests · free tier | — | — | |
| Slack Team messaging platform with audio, video, integrations and AI-powered collaboration features. |
90 days of message history, unlimited... | Free plan · paid from $7.25/mo | — | — |
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