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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, $0.0025/call, status unknown (last checked 2026-09-15).
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$0.0025
Success—
StatusUnknown
How this service works
60 paid endpoints with no metering, no API key and no account. Each endpoint has one flat price per call, whatever the size of the request: LLM completions with automatic failover across several large models, read-only EVM tooling over Base, Ethereum, Polygon, Arbitrum and Optimism, and pure crypto utilities that touch no network.
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
POSThttps://flat-rate-llm.kikoribera03.workers.dev/v1/util/keccak256When 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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