One-Click Auth represents a key advancement within WalletConnect v2, streamlining the user authentication process in AppKit by enabling them to seamlessly connect with a wallet and sign a SIWE message with just one click.Connecting a wallet, proving control of an address with an off-chain signature, authorizing specific actions. These are the kinds of authorizations that can be encoded as “ReCaps”. ReCaps are permissions for a specific website or dapp that can be compactly encoded as a long string in the message you sign and translated by any wallet into a straight-forward one-sentence summary.
WalletConnect uses permissions expressed as ReCaps to enable a One-Click Authentication.
In order for One-Click Auth to work, you need to meet the following requirements:
Enable SIWX in your AppKit configuration - One-Click Auth requires SIWX (Sign In With X) to be enabled in your AppKit setup.
Configure EVM chains only - One-Click Auth currently supports EVM chains only. Make sure your AppKit networks configuration includes only EVM-compatible chains.
Use Reown Authentication or set up a backend - You need to have a backend to communicate with. This backend will be used to generate a nonce, verify messages and handle sessions.
More info here