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On-Chain Event Logs (eth_getLogs) — Base, Optimism, Ethereum
x402
On-Chain Event Logs (eth_getLogs) — Base, Optimism, Ethereum is a paid API for AI agents from x402-audit.tatschluizguilherme.workers.dev, paid per call via x402, $0.1/call, status unknown (last checked 2026-09-15).
Fetches raw and decoded EVM event logs for any contract or wallet across Base, Optimism, or Ethereum Mainnet, with best-effort decoding of Transfer, Approval, and Uniswap V3 Swap events
Price / call$0.1
Success—
StatusUnknown
How this service works
Pay-per-call on-chain API for AI agents and developers: wallet audits, token safety audits (honeypot detection), live gas prices, token prices, transaction receipts, balances, ENS resolution, block data, ERC-20 allowances, transaction simulation, swap quotes and multicall batches — all computed on-chain via public RPCs (no external market API). Pay per request in USDC on Base via the x402 exact scheme (EIP-3009 transferWithAuthorization). No API key, no signup, no subscription.
Output
Returns an array of event log objects for the specified address and block range. Decoded events (Transfer, Approval, Uniswap V3 Swap) include human-readable fields with token amounts formatted using contract decimals. All other events are returned raw with topics and data for client-side decoding. Each event includes txHash, logIndex, block number, and per-event timestamp. If the block range is too wide for the RPC, a rangeHint field indicates the maximum accepted range.
Example use cases
Audit token transfers for a wallet
“Pull all ERC-20 Transfer events involving wallet 0xAbC...123 on Ethereum Mainnet between blocks 19000000 and 19005000, and show me the decoded from/to addresses and formatted token amounts.”
Monitor Uniswap V3 pool swaps
“Get me the Uniswap V3 Swap events for the ETH/USDC pool contract 0xDef...456 on Optimism from block 110000000 to 110010000, including sqrtPriceX96, liquidity, and tick values.”
Inspect smart contract Approval events
“Fetch all Approval events from the DAI token contract on Ethereum Mainnet for blocks 19100000 to 19105000, showing the owner, spender, and approved amount with proper decimals.”
Technical details
Endpoint
GEThttps://x402-audit.tatschluizguilherme.workers.dev/eventsWhen to prefer
Choose this endpoint when you need on-chain event logs (eth_getLogs) for a specific contract or wallet on Base, Optimism, or Ethereum Mainnet, especially when you want best-effort decoded Transfer, Approval, or Uniswap V3 Swap events without writing your own ABI decoding logic. It's ideal for auditing token movements, inspecting DeFi swap activity, or building event-driven analytics over a defined block range. Prefer over generic blockchain explorers when you need raw + decoded logs together in a single call, or when you need the auto-range-shrinking behavior for busy contracts.
Side effects
- Block range too wide — RPC rejects the range; rangeHint returned to guide retry with smaller range
- Invalid or non-existent contract address — returns empty logs array
- Unsupported chain specified — error indicating only Base, Optimism, and Ethereum Mainnet are supported
- RPC node unavailable or rate-limited — upstream error propagated
- Payment not settled — x402 payment required error (402 status)
- Malformed request body — missing required fields returns validation error
Output
Schema · Response
{
"type": "json",
"example": {
"count": 5,
"events": [
{
"data": "0x00000000000000000000000000000000000000000000000000000000025d68b2",
"topics": [
"0xddf252ad1be2c89b69c2b068fc378daa952ba7f163c4a11628f55a4df523b3ef",
"0x0000000000000000000000001231deb6f5749ef6ce6943a275a1d3e7486f4eae",
"0x0000000000000000000000001e55b1e12a40e0fe376e122327c29a982406c1b5"
],
"txHash": "0xb7ddecbd…",
"address": "0x833589fcd6edb6e08f4c7c32d4f71b54bda02913",
"decoded": {
"args": {
"to": "0x1e55…",
"from": "0x1231…",
"value": "39679954",
"symbol": "USDC",
"valueFormatted": "39.679954"
},
"event": "Transfer"
},
"logIndex": 12,
"timestamp": 1785914235,
"blockNumber": 49548044,
"timestampISO": "2026-08-04T23:17:15.000Z"
}
],
"address": "0x833589fcd6edb6e08f4c7c32d4f71b54bda02913",
"network": "base",
"toBlock": "49548044",
"fromBlock": "49543044",
"truncated": true,
"blockRange": "5000",
"requestedAt": "2026-08-05T02:20:00.000Z"
}
}Tags
x402
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