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Keccak-256 Hash
x402
Keccak-256 Hash is a paid API for AI agents from flat-rate-llm.kikoribera03.workers.dev, paid per call via x402, $0.005/call, status unknown (last checked 2026-10-29).
Computes the Keccak-256 hash of any string or hex-encoded byte payload — the specific hash function Ethereum uses internally, distinct from SHA3-256.
Price / call$0.005
Success—
StatusUnknown
How this service works
Keccak-256 of any string or hex payload - the hash Ethereum actually uses, which is NOT the same as SHA3-256. Needed for selectors, event topics, salts and CREATE2 addresses.
Output
Returns a JSON object with a `hash` field containing the 0x-prefixed Keccak-256 hex digest and a `bytes` field indicating the byte length of the input that was hashed.
Example use cases
Derive Ethereum function selector
“Give me the Keccak-256 hash of 'transfer(address,uint256)' so I can extract the first 4 bytes as the ERC20 function selector.”
Compute CREATE2 salt hash
“I need the Keccak-256 hash of this hex payload 0xdeadbeef1234 to use as a salt when computing a CREATE2 contract address.”
Get Solidity event topic hash
“Hash the event signature 'Transfer(address,address,uint256)' with Keccak-256 so I can identify this event's topic0 in Ethereum logs.”
Technical details
Endpoint
GEThttps://flat-rate-llm.kikoribera03.workers.dev/v1/util/keccak256?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need the exact Keccak-256 hash that Ethereum uses natively — for computing function selectors, event topic hashes, CREATE2 address salts, or any on-chain hash verification. Do not substitute SHA3-256 (NIST), which produces different output. Prefer this over running a local hash library when operating inside an agent workflow that already uses x402 micropayments.
Side effects
- Missing or empty `input` field returns an error response
- Malformed 0x-prefixed hex (odd length or invalid characters) may cause a parsing error
- Very large payloads may time out or be rejected
- Network errors or Cloudflare Worker cold-start failures return non-2xx HTTP status
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | string | Plain text, or a 0x-prefixed hex payload to hash as bytes. |
Output
Schema · Response
| Field | Type | Description |
|---|---|---|
| hash | string | |
| bytes | number |
Tags
x402
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