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AgentResolver Keccak256 Hash
x402
AgentResolver Keccak256 Hash is a paid API for AI agents from agentresolver.vercel.app, paid per call via x402, $0.004/call, status unknown (last checked 2026-09-18).
Computes the Keccak-256 cryptographic hash of an input string, returning the digest as a 0x-prefixed hex value.
Price / call$0.004
Success—
StatusUnknown
How this service works
Verify an x402 endpoint before paying: live payTo, USDC quote, network, asset, resource binding, TLS and endpoint safety for $0.001 on Base or Solana.
Output
Returns a JSON object containing: the algorithm name ('keccak256'), the encoding used (utf8 or hex), the number of input bytes processed, and the 32-byte digest as a 0x-prefixed 64-character lowercase hex string (e.g. '0xabc123...').
Example use cases
EVM Function Selector Generation
“Hash the string 'transfer(address,uint256)' with keccak256 using utf8 encoding so I can get the 4-byte function selector for my Solidity contract.”
Ethereum Event Topic Derivation
“I need the keccak256 hash of 'Transfer(address,address,uint256)' to use as the topic0 filter when querying EVM event logs — please compute it from the utf8 string.”
Hex-Encoded Data Hashing
“Compute the keccak256 digest of this hex-encoded payload: '0xdeadbeef' — treat it as hex input and give me the resulting hash.”
Technical details
Endpoint
POSThttps://agentresolver.vercel.app/api/keccak256When to prefer
Choose this endpoint when you need a pay-per-call, serverless Keccak-256 hash computation — especially for Ethereum/EVM use cases like computing function selectors, event topic hashes, or verifying Solidity keccak256 outputs. Prefer it over running a local library when operating in a sandboxed agent environment without native crypto access. Not suited for SHA-256, MD5, or non-Keccak hashing.
Side effects
- Missing required 'input' field returns a validation error
- Invalid encoding value (not 'utf8' or 'hex') causes a schema error
- Malformed hex input when encoding is 'hex' may cause a parsing error
- Payment of 0.004 USDC via x402 required; missing payment returns 402 response
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| input | string | |
| encoding | string |
Output
Schema · Response
{
"type": "json",
"example": {}
}Tags
x402
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