Permit2

Sign a Permit2 message, approve USDC to Permit2, then execute the swap. Ensure you are on Base (chainId 8453).

Sign & send raw transaction

Paste either (1) a full RLP-encoded unsigned tx hex, or (2) raw calldata hex (e.g. 0x3593564c...). For calldata, set To, gas, and chain below. Your wallet will be prompted to sign and the transaction will be broadcast (MetaMask and most wallets do not support sign-only).