Compute keccak256 (the EVM/Solidity hash — event topics, function selectors, mapping keys) or sha256 of any input. Pass input=text for UTF-8, or 0x-hex to hash raw bytes; algo=keccak256 (default) or sha256. Returns the digest and, for keccak, the 4-byte function selector. Pure compute, no chain, sub-cent — the commodity hashing call the whole x402 ecosystem hammers, served at the floor. Not financial advice.

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