SimpleHash Webhook API

Currently live on 20 chains and testnets

The webhook API enables clients to subscribe to Webhook Events. It complements the existing REST API by allowing users to receive notifications when real-time NFT events occur. Webhooks eliminate the need for clients to continuously poll via the existing REST API to check for event occurrence, saving significant bandwidth.


The domain & endpoint for creating, updating and managing webhooks for mainnet & testnet events is


All webhook API endpoints require use of an API Key. See for details.


By default, up to 10 webhook subscriptions can be active for a given organization. If you require more than this, please reach out to us at [email protected]