Relayly Documentation
Everything you need to send email with Relayly — from your first API call to production-grade webhooks.
🚀 Quickstart
Send your first email in under five minutes.
🔑 Authentication
Create scoped API keys and authenticate requests.
✉️ Send email
The transactional send endpoint, fields, and responses.
🔔 Webhooks
Receive and verify signed delivery, open, click and bounce events.
Base URL & conventions
All API requests go to https://api.relayly.io. Every response uses a consistent envelope:
{ "success": true, "data": { ... }, "pagination": { ... }, "meta": { "request_id": "req_..." } }Send writes with an Idempotency-Key header to retry safely. Lists paginate with ?page=&page_size= (max 500). Rate limits are per API key; exceeding them returns 429. The full interactive reference lives at api.relayly.io/api/docs.