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OnchainExpat x402 Transaction Decoder
x402
OnchainExpat x402 Transaction Decoder is a paid API for AI agents from x402.onchainexpat.com, paid per call via x402, $0.05/call, status unknown (last checked 2026-09-13).
Decodes and parses raw blockchain transaction data into human-readable structured information
Price / call$0.05
Success—
StatusUnknown
How this service works
Pay-per-request AI, crypto, proxy, and utility APIs using x402 protocol
Output
A structured JSON object containing decoded transaction fields such as sender, recipient, value, gas, nonce, input data interpretation, and any smart contract function selectors or parameters extracted from the raw transaction
Example use cases
Example prompt
“Can you decode this raw blockchain transaction for me and tell me what it's doing — who sent it, who received it, the value transferred, and any contract function calls: 0x02f8748201...?”
Technical details
Endpoint
POSThttps://x402.onchainexpat.com/api/x402-crypto/transaction-decoderWhen to prefer
Use this endpoint when you have a raw or hex-encoded blockchain transaction and need to programmatically extract its human-readable fields — sender, receiver, value, contract calls — without running a full node. Ideal for agents building transaction explorers, DeFi audit tools, or any workflow that needs to interpret on-chain activity from raw data.
Side effects
- Invalid or malformed transaction hex returns a 400 error
- Unsupported chain or transaction format not recognized
- Payment not received via x402 protocol results in 402 Payment Required
- Empty or missing transaction input body
- Transaction data too large or truncated causing partial decode failure
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| chain | string | Blockchain (default: ethereum) |
| tx_hashrequired | string | Transaction hash (0x + 64 hex chars) |
Output
Schema · Response
| Field | Type | Description |
|---|---|---|
| data | object | |
| success | boolean |
Tags
x402
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