Use https://tx.steer.fun to have a user execute a wallet action (send a transaction or sign a message) with their own wallet via a shareable URL. Use when an agent needs the user to approve/execute a JSON-RPC request (e.g. eth_sendTransaction, personal_sign, eth_signTypedData_v4, wallet_sendCalls) and return the result (tx hash/signature) back to the agent, optionally via redirect_url.