Signing API - Blockradar

The Signing API lets you sign arbitrary messages and EIP-712 typed data from a Blockradar wallet or child address. This is used for authentication flows, permit-style approvals, and off-chain agreement signing.

What you can do

Sign a plain message from a master wallet or child address
Sign EIP-712 structured typed data for standards-compliant workflows

Endpoints

Method	Endpoint	Description
`POST`	`/wallets/{walletId}/signing/message`	Sign a message (master wallet)
`POST`	`/wallets/{walletId}/signing/typed-data`	Sign EIP-712 typed data (master wallet)
`POST`	`/wallets/{walletId}/addresses/{addressId}/signing/message`	Sign a message (child address)
`POST`	`/wallets/{walletId}/addresses/{addressId}/signing/typed-data`	Sign EIP-712 typed data (child address)

Full API Reference

View all signing endpoints in the API Reference tab.