The HTTP Capability

The HTTP capability is a decentralized service that allows your workflow to securely interact with any external, offchain API. It can be used to both fetch data from and send data to other systems.

Why use a Capability for HTTP Requests?

When your workflow needs to interact with an external API, the HTTP capability provides decentralized execution across multiple independent nodes.

When you use the SDK's http.Client to make a request (like a GET or a POST), you are invoking this capability. CRE instructs each node in a dedicated DON to make the same API request. The nodes' individual responses are then validated through a consensus protocol, which ensures they agree on the result before returning it to your workflow.

This provides cryptographically verified, tamper-proof execution for your offchain data operations.

Learn more

• API Interactions Guide: Learn how to use the SDK to invoke the HTTP capability.
• HTTP Client SDK Reference: See the detailed API reference for the http.Client.