Swap tools for agents on Ethereum, Arbitrum, Base, BNB Chain, Polygon and Optimism. Cleave is a DEX aggregator with split routing and one-step cross-chain swaps; Cleave's fees are included in the quoted price. Plan a swap, track it, find a token or get gas. Returns unsigned calls and takes no private keys; submitting a wallet-signed gas order uses needsApproval by default. No API key needed.