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SperaxOS Contract Events Explorer
x402
SperaxOS Contract Events Explorer is a paid API for AI agents from chat.sperax.io, paid per call via x402, $0.005/call, status unknown (last checked 2026-10-16).
Fetches on-chain smart contract events from EVM-compatible blockchains, optionally filtered by event signature, returning recent decoded event data.
Price / call$0.005
Success—
StatusUnknown
How this service works
AI-powered DeFi intelligence APIs payable via the x402 HTTP payment protocol. No API key required — pay per request with USDC on Base. Identity-only (SIWX) endpoints are free for wallets with an agentcash identity.
Output
Returns a list of decoded on-chain event log entries for the specified contract, each containing event name, topics, decoded parameters, block number, transaction hash, and timestamp. Filtered by the provided event signature if supplied, limited to the requested count.
Example use cases
Track token transfers on a contract
“Show me the last 15 Transfer events for the token contract 0x6B175474E89094C44Da98b954EedeAC495271d0F on Ethereum — I want to see who's been moving DAI around recently.”
Monitor DEX swap activity on Arbitrum
“Fetch up to 25 Swap events from the Uniswap V3 pool at 0xC31E54c7a869B9FcBEcc14363CF510d1c41fa443 on Arbitrum so I can see recent trading activity.”
Audit NFT minting events on Base
“Get the last 10 Transfer events from the NFT contract 0x7Fc66500c84A76Ad7e9c93437bFc5Ac33E2DDaE9 on Base — I need to check which wallets minted recently.”
Technical details
Endpoint
POSThttps://chat.sperax.io/api/x402/tools/contract-explorer/getContractEvents?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need to retrieve historical or recent on-chain event logs for a specific EVM smart contract across multiple chains (Ethereum, Arbitrum, Polygon, Base, Optimism, Avalanche, BSC) without needing a traditional API key. It is ideal for DeFi intelligence workflows where pay-per-use micro-payments via USDC on Base are acceptable and you want decoded event data with optional event signature filtering.
Side effects
- Invalid or malformed contract address returns an error
- Unsupported chain name results in a bad request response
- No events found for the specified filter returns an empty array
- Payment failure via x402 (insufficient USDC balance) blocks the request
- Rate limiting or RPC node unavailability may cause timeouts
- Very new contracts with no event history return empty results
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| chain | string | Chain name: ethereum, arbitrum, polygon, base, optimism, avalanche, bsc. Defaults to ethereum. |
| limit | number | Max number of events to return (default 10) |
| address | string | EVM contract address (0x…) |
| eventSignature | string | Optional: filter by event signature topic (e.g. "Transfer(address,address,uint256)") |
Tags
x402
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