Use the Relay CLI
Tail live events, forward webhooks to localhost and send test messages from your terminal.
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Official SDKs
Install the Relay SDK for Node.js, Python, PHP or Go — typed, retried and kept current with the API.
Verify webhook signatures
Check the <code>Relay-Signature</code> header with your endpoint secret to make sure the event came from Relay.
Receive delivery webhooks
Relay posts an event to your endpoint whenever a message is queued, delivered, opened or fails.
Schedule a message
Send later with <code>send_at</code>, in the recipient’s time zone or yours.
Send SMS, email and push with one call
One endpoint, three channels: set <code>channel</code> and Relay handles formatting, retries and fallbacks.
Rotate a secret key without downtime
Roll a key with a 24-hour overlap so you can deploy the new one before the old one stops working.
Authenticate with API keys
Send your secret key as a bearer token. Keys can be limited to scopes and IP ranges.
Test mode and live mode
Every account has a test and a live environment with separate keys, data and webhooks.
Send your first message
Create a test key, send an SMS to your own phone and read the delivery status — in under five minutes.