Relayly Documentation
Everything you need to send email with Relayly — from your first API call to production-grade webhooks.
QuickstartSend your first email in under five minutes.AuthenticationCreate scoped API keys and authenticate requests.Send emailThe transactional send endpoint, fields, and responses.WebhooksReceive 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.