> ## Documentation Index
> Fetch the complete documentation index at: https://circle-devdocs-test-ai-codegen-component.mintlify.site/llms.txt
> Use this file to discover all available pages before exploring further.

# Create a challenge to sign typed data

> Generates a challenge for signing the EIP-712 typed structured data from a specified user-controlled wallet. This endpoint only supports Ethereum and EVM-compatible blockchains. Please note that not all Dapps currently support Smart Contract Accounts (SCA); the difference between Ethereum's EOA and SCA can be found in the [account types guide](/wallets/account-types). You can also check the list of Ethereum Dapps that support SCA: https://eip1271.io/.