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TraceFast Transaction Event Logs
x402
TraceFast Transaction Event Logs is a paid API for AI agents from mpp.tracefast.xyz, paid per call via x402, $0.005/call, status unknown (last checked 2026-10-12).
Retrieves the ordered list of event logs emitted by an Ethereum transaction, with emitting contract, topics, raw data, and decoded event name/arguments when the signature is recognized
Price / call$0.005
Success—
StatusUnknown
How this service works
TraceFast live Ethereum data: the event logs a transaction emitted, in emission order, each with the emitting contract, topics and data, and — when the event signature is known — the decoded event name and arguments with a stated confidence. Path hash: Transaction hash, `0x`-prefixed, 64 hex characters, any case. Query limit: 1..=100, default 25; cursor: `nextCursor` of the previous page. Docs: https://docs.tracefast.xyz/api/transaction-events.md
Output
An ordered array of event log entries, each containing the emitting contract address, array of topics (hex-encoded), raw data field, log index, and — where the event signature is recognized — the decoded event name and typed arguments along with a stated confidence score. The response also includes a nextCursor token for paginating through additional logs beyond the requested limit.
Example use cases
DeFi swap event breakdown
“I just submitted a Uniswap swap in transaction 0xa9d1e08c7793951c899f3efdff20fc9a9a6fe049d8e2e4a7f5a9b0f9c6d5e4b3 — can you show me every event it emitted in order, with decoded names and arguments so I can confirm the exact amounts exchanged?”
NFT mint transaction audit
“Show me all the on-chain events from this NFT mint transaction 0x3b5d9f4e2c1a8b7d6e5f4c3a2b1d0e9f8c7b6a5d4e3f2a1b0c9d8e7f6a5b4c3, including which contracts fired events and what the decoded Transfer arguments say about the recipient and token ID.”
Smart contract debug log inspection
“My contract deployment transaction 0x1f2e3d4c5b6a7908a7b6c5d4e3f2a1b09f8e7d6c5b4a3928d7c6b5a4938271f seems to have failed partway through — can you retrieve the event logs it emitted so I can see where execution stopped?”
Technical details
Endpoint
GEThttps://mpp.tracefast.xyz/api/v1/chains/1/transactions/:hash/events?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need the complete ordered event log sequence for a specific Ethereum transaction, especially when you want both raw log data and human-readable decoded event names and arguments. It is the right choice for debugging smart contract interactions, auditing DeFi swaps, verifying NFT transfers, or any workflow that requires inspecting exactly what happened inside a transaction at the event level. Prefer it over generic block explorers when you need structured, machine-readable decoded output with confidence scores suitable for programmatic processing.
Side effects
- Transaction hash not found or invalid format returns an error
- Transaction exists but emitted no events returns an empty array
- Unrecognized event signatures return raw topics/data without decoded fields
- Pagination cursor mismatch or expiry causes an error
- Rate limiting or payment failure (x402) blocks the request
- Network or RPC issues may cause transient failures
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| input | — |
Tags
x402
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