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Keccak-256 Hash API
x402
Keccak-256 Hash API is a paid API for AI agents from api.api-agent-ia.ch, paid per call via x402, $0.001/call, status unknown (last checked 2026-10-26).
Computes the Keccak-256 cryptographic hash of a given text string and returns the hex-encoded digest
Price / call$0.001
Success—
StatusUnknown
How this service works
Need a function selector or an event topic? Returns the Keccak-256 hash of a text string, in 0x hex ($0.001 per call).
Output
A JSON object containing the original input text and its Keccak-256 hash as a 0x-prefixed hex string (e.g. {"hash": "0x1c8aff...", "text": "hello"}).
Example use cases
Smart contract input verification
“I need the Keccak-256 hash of the string 'Transfer(address,address,uint256)' so I can use it as the event signature topic in my Ethereum smart contract.”
Deterministic identifier generation
“Hash the text 'user:42:session:2024' with Keccak-256 so I can use it as a deterministic, fixed-length identifier in my dApp.”
Off-chain message signing prep
“Give me the Keccak-256 hash of 'I agree to the terms of service v2' — I need it before signing the message with a private key.”
Technical details
Endpoint
GEThttps://api.api-agent-ia.ch/hash-keccak?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need an Ethereum/Solidity-compatible Keccak-256 hash (not SHA-3) of a text string — particularly useful for generating EVM event signatures, function selectors, or verifiable digests in web3 workflows. It is a simple, pay-per-call API requiring no setup, ideal for agents that need one-off hashing without integrating a cryptographic library.
Side effects
- Missing required 'text' query parameter returns an error response
- Empty string input may return a valid hash of the empty string (not an error)
- Very long text strings may be rejected or truncated
- Network errors or service downtime return non-200 status codes
- Invalid UTF-8 or special characters in text may cause unexpected results
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"hash": "0xa9059cbb2ab09eb219583f4a59a5d0623ade346d962bcd4e46b11da047c9049b",
"text": "transfer(address,uint256)"
}
}Tags
x402
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