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.
8 results after 1 active filters. Remove any one below without losing the rest of the cut.
Amazon Simple Notification Service
Amazon SNS is the AWS pub/sub service — fans out messages to email, SMS, HTTP, Lambda, SQS, and more.
Amazon Simple Queue Service
Amazon SQS is AWS-managed distributed message queue — at-least-once Standard queues and exactly-once FIFO queues.
Cloud Pub/Sub API
Google Cloud Pub/Sub API is a globally-scaled message queue — topic/subscription model, at-least-once delivery, millisecond latency, auto-scaling.
Slack Web API
Slack Web API lets apps read and post messages, manage channels, and upload files — the foundation for Slack bots and integrations.
Twilio - Chat
Twilio Chat v1 is a sunset real-time chat SDK backend (superseded by Conversations). Existing projects still work; new projects should use Conversations API.
Twilio - Content
Twilio Content API centrally manages messaging templates across channels (WhatsApp/SMS/Messenger), including WhatsApp template approval flow and dynamic variable binding.
Twilio - Conversations
Twilio Conversations unifies multi-channel (SMS/MMS/WhatsApp/Chat/Email) messaging into a single "conversation" primitive with multi-participant, persistence, and read receipts.
Twilio - Frontline
Twilio Frontline is a mobile messaging app for field employees (sales, on-site staff) — chat with customers via WhatsApp/SMS using a work number, with full compliance audit trail.