Find the right API
Use search when the broad directory stops being enough. Filter by category, auth, CORS, signup friction, and result freshness until the shortlist becomes obvious.
Start with category and auth when you know the integration shape. Use free, signup, and CORS flags when you are trying to remove setup friction.
Sort by verification or response time when the final call is about reliability, not just category fit.
3 results after 1 active filters. Remove any one below without losing the rest of the cut.
Amazon Simple Email Service
Amazon SES (Simple Email Service) API programmatically sends emails (transactional, marketing, bulk) — pay per send.
Email Activity (beta)
Twilio SendGrid sends transactional and marketing emails with deliverability analytics for opens, clicks, and bounces.
Gmail API
Gmail API lets apps read, send, and organize mail on behalf of a Google account — the core entry point for Workspace integrations.