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EVM Calldata & Transaction Decoder / x402 Settlement Verifier
x402
EVM Calldata & Transaction Decoder / x402 Settlement Verifier is a paid API for AI agents from workbot1.oddsys.org, paid per call via x402, $0.005/call, status unknown (last checked 2026-09-15).
Decodes a Base-mainnet transaction hash or raw EVM calldata into human-readable form — function selector, matched signature, named arguments, and ERC-20/USDC transfer events — and can verify an x402 payment settlement receipt in one call.
Price / call$0.005
Success—
StatusUnknown
How this service works
Decode EVM calldata or a Base-mainnet transaction into human-readable form: function selector, matched signature, named args, plus ERC-20/USDC transfer events from the receipt — verify an x402 settlement receipt (tx hash in, payer/payee/amount out) in one call.
Output
Returns the decoded function selector, matched ABI signature, named and typed arguments, and any ERC-20/USDC Transfer events found in the transaction receipt, including payer address, payee address, and USDC amount — all in structured, human-readable JSON.
Example use cases
Verify x402 payment receipt
“I need to confirm that this Base transaction 0xabc123...def456 is a valid x402 payment — can you decode it and tell me who the payer was, who the payee was, and how much USDC was transferred?”
Debug smart contract call
“This transaction hash on Base — 0x7f1e...8d34 — was a failed contract interaction. Can you decode the calldata so I can see which function was called and what arguments were passed?”
Audit USDC transfer events
“Pull the ERC-20 transfer events from Base tx 0x99ab...1234 and give me the full breakdown: token, sender, recipient, and amount — I need it for our payment reconciliation records.”
Technical details
Endpoint
POSThttps://workbot1.oddsys.org/decode-txWhen to prefer
Choose this endpoint when you need a single-call solution to decode Base-mainnet EVM calldata or verify an x402 payment settlement receipt — it combines calldata decoding and ERC-20 event extraction in one step, saving round trips. Prefer it over raw RPC calls when you need human-readable argument names and USDC transfer verification without setting up local ABI parsing infrastructure.
Side effects
- Transaction hash not found on Base mainnet — returns 404 or not-found error
- Calldata does not match any known ABI signature — selector returned but arguments may be unresolved
- Transaction is pending/unconfirmed — receipt events unavailable
- Malformed calldata or invalid hex — parsing error returned
- Rate limit or payment failure for the $0.005 USDC per-call fee
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| data | string | 0x-prefixed EVM calldata to decode (offline). |
| txHash | string | 0x-prefixed Base-mainnet transaction hash — fetches, decodes, and lists ERC-20/USDC transfer events (x402 receipt verification). |
Tags
x402
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