Crypto primitives for on-chain agents: keccak256, EIP-191 signature recovery, EIP-712 typed-data verification, and Merkle tree roots/proofs/verification.
Price: 0.020 USDC on Base per call. Pay via x402:
POST https://chainkit.leeworks.dev/v1/crypto with body {"op": "...", ...}. No account, no KYC.