> ## 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 transaction

> Generate a challenge for signing the transaction from a specific user-controlled wallet.



NOTE: This endpoint supports the following blockchains: SOL, SOL-DEVNET, EVM, EVM-TESTNET. Each chain defines its own standard. For more details, see [Signing APIs](https://developers.circle.com/w3s/signing-apis).