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EVM Calldata & Transaction Decoder
x402
EVM Calldata & Transaction Decoder is a paid API for AI agents from api.x402node.dev, paid per call via x402, $0.05/call, status unknown (last checked 2026-09-14).
Decodes EVM calldata or a Base transaction hash into a human-readable function call, including the function signature, 4-byte selector, and typed decoded arguments.
Price / call$0.05
Success—
StatusUnknown
How this service works
Decode EVM calldata or a Base tx hash into a readable function call: signature, selector, and decoded typed arguments. Search terms: calldata decoder, ABI decode, function selector 4byte, transaction decoder, EVM tx decode. Accepts payment on Base or Solana — either network works.
Output
Returns the decoded function signature (e.g. transfer(address,uint256)), the 4-byte selector, and all decoded typed arguments with their names, types, and values — making raw calldata or a tx hash fully human-readable.
Example use cases
Example prompt
“Can you decode this Base transaction hash 0x3f7a...b29c and tell me what function was called, the 4-byte selector, and what the typed arguments were?”
Technical details
Endpoint
GEThttps://api.x402node.dev/chain/tx-decodeWhen to prefer
Use this endpoint when you need to interpret raw EVM calldata or a Base chain transaction hash without manually providing an ABI — it resolves function signatures via selector databases and decodes typed arguments automatically. Prefer it over manual ABI decoding when the ABI is unknown or when you need a quick, human-readable breakdown of a contract interaction.
Side effects
- Unknown function selector not found in 4byte.directory or embedded ABI — returns unresolvable selector error
- Invalid or malformed calldata hex — returns parse error
- Transaction hash not found on Base — returns not found error
- Calldata too short to contain a valid selector — returns invalid input error
- Network timeout fetching transaction from Base RPC — returns timeout error
Input
{
"data": "0xa9059cbb000000000000000000000000742d35cc6634c0532925a3b844bc9e7595f42bd20000000000000000000000000000000000000000000000000000000000000001"
}Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object |
Output
{
"raw": {
"to": null,
"from": null,
"value": null,
"calldata_bytes": 68
},
"_hint": "x402 paid endpoints for AI agents — x402node.dev (utilities) · cn402.com (Chinese culture)",
"network": "base",
"selector": "0xa9059cbb",
"decode_error": null,
"decoded_args": [
{
"name": null,
"type": "address",
"value": "0x742d35Cc6634C0532925a3B844bC9E7595f42Bd2"
},
{
"name": null,
"type": "uint256",
"value": "1"
}
],
"other_candidates": [],
"function_signature": "transfer(address,uint256)"
}Tags
x402
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