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Base Mainnet Smart Contract Event Logs
x402
Base Mainnet Smart Contract Event Logs is a paid API for AI agents from x402.agentindex.world, paid per call via x402, $0.005/call, status unknown (last checked 2026-10-11).
Fetches raw smart contract event logs from Base mainnet using eth_getLogs, filterable by contract address and up to 4 topics over a range of up to 2,000 blocks.
Price / call$0.005
Success—
StatusUnknown
How this service works
Smart contract event logs on Base mainnet (Base contract events) via eth_getLogs - filter by contract address and up to 4 topics, up to 2,000 blocks, raw logs with topics, data, block and tx hash.
Output
Returns an array of raw Ethereum event log objects, each containing: address (contract), topics array (up to 4 indexed parameters as hex strings), data (non-indexed ABI-encoded fields as hex), blockNumber, blockHash, transactionHash, transactionIndex, logIndex, and removed flag. Covers at most 2,000 blocks per call.
Example use cases
Monitor DEX swap events on Base
“Pull all Swap event logs from the Aerodrome router contract 0xcF77a3Ba9A5CA399B7c97c74d54e5b1Beb874E43 on Base between blocks 21000000 and 21002000 — I need the raw topics and data to track liquidity activity.”
Debug a contract's recent emissions
“Can you fetch the last 500 blocks worth of events from my deployed contract at 0xAbC123... on Base mainnet so I can see what it's been emitting? Use from_block 21500000 to to_block 21500500.”
Track ERC721 mints by topic
“Get all logs from the Base NFT contract 0xd4307E0acD12CF46fD6A2C719FCC3F394DD5A44f between blocks 19800000 and 19802000 filtered by the Transfer topic 0xddf252ad1be2c89b69c2b068fc378daa952ba7f163c4a11628f55a4df523b3ef and the zero-address sender topic to catch mints only.”
Technical details
Endpoint
GEThttps://x402.agentindex.world/base/events?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need raw, unfiltered event logs from any smart contract on Base mainnet, especially when you want flexibility in topic filtering (up to 4 topics) or are working with non-standard events beyond ERC20 transfers. Prefer the sibling base-erc20-transfers endpoint for straightforward ERC20 Transfer event queries. Choose this endpoint when debugging contract behavior, monitoring arbitrary event emissions, or building analytics over custom Solidity events.
Side effects
- Block range exceeds 2,000 blocks — API rejects with an error
- Invalid contract address format — returns error
- Topic array exceeds 4 elements — rejected
- No logs found in range — returns empty array
- Payment not settled — 402 Payment Required response
- Node RPC timeout for dense block ranges — may return partial or error
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| topics | array | |
| address | — | |
| to_block | integer | |
| from_block | integer |
Tags
x402
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