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EVM Event Logs by Contract, Topic, and Block Range
x402
EVM Event Logs by Contract, Topic, and Block Range is a paid API for AI agents from twin.unykorn.org, paid per call via x402, $0.006/call, status unknown (last checked 2026-10-01).
Retrieves on-chain event logs filtered by smart contract address, topic hash, and block range across 10 EVM-compatible chains.
Price / call$0.006
Success—
StatusUnknown
How this service works
Event logs filtered by contract, topic and block range — Genesis402 / UnyKorn Operator Network
Output
Returns a JSON object with ok status, event log data for the matched logs, a payment receipt containing transaction hash, USD amount charged, and a receipt ID, plus a generated_at ISO8601 timestamp.
Example use cases
DeFi swap event audit
“Get all Swap events (topic0 0xd78ad95fa46c994b6551d0da85fc275fe613ce37657fb8d5e3d130840159d822) from the Uniswap V2 USDC/ETH pool at 0xB4e16d0168e52d35CaCD2c6185b44281Ec28C9Dc on Ethereum between blocks 18500000 and 18510000.”
ERC-20 token transfer history
“Fetch all Transfer events for the DAI token contract at 0x6B175474E89094C44Da98b954EedeAC495271d0F on Polygon from block 50000000 to 50050000 — I need to see every transfer that happened in that window.”
DAO governance event monitoring
“Retrieve all ProposalCreated events (topic0 0x7d84a6263ae0d98d3329bd7b46bb4e8d6f98cd35a7adb45c274c8b7fd5ebd5e0) from the Compound Governor contract at 0xc0Da02939E1441F497fd74F78cE7Decb17B66529 on Ethereum between blocks 17000000 and 17100000.”
Technical details
Endpoint
POSThttps://twin.unykorn.org/evm-logs?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need on-chain EVM event logs filtered precisely by contract address, topic hash, and block range across any of 10 supported chains without running your own node. It is ideal for agents doing DeFi analytics, token transfer audits, DAO governance monitoring, or any task requiring historical smart contract events. Prefer it over general-purpose RPC providers when you want a pay-per-call model without API key management.
Side effects
- Invalid contract address format (must be 0x + 40 hex chars) returns validation error
- Invalid topic0 hash format (must be 0x + 64 hex chars) returns validation error
- Unsupported chain name returns enum validation error
- Block range too large may time out or return partial results
- No matching logs in the specified range returns empty log array
- Payment failure (insufficient USDC balance) blocks request execution
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| params | object |
Output
Schema · Response
{
"type": "json",
"example": {
"ok": true,
"type": "evm-logs",
"receipt": {
"tx_hash": "0x<64hex>",
"amount_usd": 0.006,
"receipt_id": "g402-<16hex>"
},
"generated_at": "<iso8601>"
}
}Tags
x402
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