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PayAI Crypto Hash Utility
x402
PayAI Crypto Hash Utility is a paid API for AI agents from payai.agentstools.dev, paid per call via x402, $0.001/call, status unknown (last checked 2026-09-15).
Computes cryptographic hashes and Ethereum-specific derived values (keccak256, sha256, 4-byte function selector, event topic0, ENS namehash/labelhash) from a string or hex input.
Price / call$0.001
Success—
StatusUnknown
How this service works
Compute keccak256/sha256, a 4-byte function selector, an event topic0, or an ENS namehash/labelhash from a string or hex input.
Output
Returns a hex-encoded hash or derived value corresponding to the requested algorithm — e.g. a 32-byte keccak256 digest, a 4-byte function selector, a 32-byte event topic0, or the ENS namehash/labelhash for the given input string.
Example use cases
Verify smart contract function calls
“I need to check if a transaction is calling the transfer function on an ERC-20 contract. Can you compute the 4-byte selector for 'transfer(address,uint256)' so I can match it against the transaction data?”
Set up ENS domain resolver
“I'm configuring an ENS resolver for 'myapp.eth' and need the namehash value to register it on-chain. What's the ENS namehash for 'myapp.eth'?”
Monitor EVM event emissions
“I want to filter logs for Transfer events from a token contract. What's the event topic0 hash for the Solidity signature 'Transfer(address,address,uint256)'?”
Technical details
Endpoint
GEThttps://payai.agentstools.dev/crypto/hashWhen to prefer
Use this endpoint when an AI agent needs to compute Ethereum-ecosystem cryptographic primitives — especially ENS namehash/labelhash or Solidity ABI selectors — without running local code. Prefer it over generic hash libraries when the agent needs selector or event topic0 derivation from human-readable Solidity signatures, or ENS name resolution primitives.
Side effects
- Missing required 'algo' or 'input' query parameters — returns 400 Bad Request
- Invalid algo enum value — returns 400 with validation error
- Malformed 0x-hex input when encoding=hex is specified — returns 400 or incorrect result
- Input string too long or malformed for the selected algorithm — may return 400 or 500
- Payment not provided or insufficient — returns 402 Payment Required
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Tags
x402
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