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Event topic0 from Solidity Event Signature
x402
Event topic0 from Solidity Event Signature is a paid API for AI agents from twin.unykorn.org, paid per call via x402, $0.001/call, status unknown (last checked 2026-10-01).
Computes the keccak256 topic0 hash for a given Solidity event signature string
Price / call$0.001
Success—
StatusUnknown
How this service works
Event topic0 from a Solidity event signature — Genesis402 / UnyKorn Operator Network
Output
Returns a JSON object with ok:true, the type field set to 'abi-event-topic', the computed topic0 keccak256 hex hash for the given event signature, a timestamp, and a payment receipt including transaction hash, USD amount, and receipt ID.
Example use cases
Filter EVM logs by event type
“I need to filter Ethereum logs for Approval events — can you compute the topic0 for Approval(address indexed owner, address indexed spender, uint256 value) so I can use it as a log filter?”
Verify event signature matches on-chain log
“I'm seeing a log on Ethereum with topic0 0xddf252ad... — can you compute the topic0 for Transfer(address,address,uint256) so I can confirm it matches?”
Build event listener for DeFi protocol
“I'm setting up an event listener for a Uniswap pool and need the topic0 hash for Swap(address indexed sender, address indexed recipient, int256 amount0, int256 amount1, uint160 sqrtPriceX96, uint128 liquidity, int24 tick) — can you compute that?”
Technical details
Endpoint
POSThttps://twin.unykorn.org/abi-event-topic?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need to compute the keccak256 topic0 hash for a Solidity event signature to filter or identify EVM event logs, and you want a simple paid API call rather than running a local keccak256 library. Ideal for agents operating in blockchain contexts that need on-demand ABI encoding utilities without a full Ethereum node or local crypto library.
Side effects
- Invalid or malformed Solidity event signature returns an error response
- Missing 'signature' param in request body causes a 400-level error
- Payment failure via x402 protocol prevents execution
- Network timeout on the UnyKorn operator node
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| params | object |
Output
Schema · Response
{
"type": "json",
"example": {
"ok": true,
"type": "abi-event-topic",
"receipt": {
"tx_hash": "0x<64hex>",
"amount_usd": 0.001,
"receipt_id": "g402-<16hex>"
},
"generated_at": "<iso8601>"
}
}Tags
x402
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