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quartermaster.surewhynot.app Transaction Decoder
x402
quartermaster.surewhynot.app Transaction Decoder is a paid API for AI agents from quartermaster.surewhynot.app, paid per call via x402, $0.003/call, status unknown (last checked 2026-09-14).
Decodes a Base blockchain transaction's calldata into a human-readable function name and arguments, recognizing ERC-20 transfer/approve and EIP-3009 transferWithAuthorization used in x402 settlements.
Price / call$0.003
Success—
StatusUnknown
How this service works
Decode a Base transaction's calldata into a human-readable function call and arguments — ERC-20 transfer/approve and the EIP-3009 transferWithAuthorization used by x402 settlements. Recognizes x402 settlement transactions.
Output
A structured breakdown of the transaction's calldata including the decoded function name (e.g. transfer, approve, transferWithAuthorization), all arguments with their names and values, and a flag indicating whether this is recognized as an x402 settlement transaction.
Example use cases
Example prompt
“Can you decode this Base transaction for me and tell me what function was called and with what arguments? The hash is 0x3a1b2c4d5e6f7a8b9c0d1e2f3a4b5c6d7e8f9a0b1c2d3e4f5a6b7c8d9e0f1a2b.”
Technical details
Endpoint
GEThttps://quartermaster.surewhynot.app/v1/tx-decodeWhen to prefer
Use this endpoint when you need to understand what a specific Base transaction actually did at the calldata level — especially for ERC-20 transfers, approvals, or x402 settlement transactions using EIP-3009 transferWithAuthorization. Prefer this over generic block explorers when you need structured, machine-readable output for programmatic use or when working within an x402 payment workflow.
Side effects
- Transaction hash not found on Base — hash may be for a different chain or not yet confirmed
- Invalid hash format — must be 0x-prefixed 66-character hex string
- Transaction has no calldata (plain ETH transfer) — no function to decode
- Unrecognized function selector — returns raw selector without human-readable decoding
- Network timeout when fetching transaction from Base RPC
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Tags
x402
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