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Guide

Crypto Payment Webhook API (Signed Events)

Polling block explorers for every order does not scale and breaks at volume.

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Key facts

  • HMAC-SHA256 signing
  • Automatic retry schedule
  • Event types for full payment lifecycle

What this means

X-CM-Signature header with timestamp; replay protection; delivery logs and manual resend.

Step-by-step

  1. Register webhook endpoint.
  2. Verify signature on each delivery.
  3. Update order status and fulfill.

Next step

View API documentation →

Next steps

Related tools

Related guides

FAQ

Example event payload?

See /usdt-checkout/docs for webhook format and verification code.

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