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LION Keyless Transaction Receipt Decoder (x402)
x402
LION Keyless Transaction Receipt Decoder (x402) is a paid API for AI agents from lion-x402.lionmaster-operations.workers.dev, paid per call via x402, $0.01/call, status unknown (last checked 2026-09-15).
Fetches and decodes a blockchain transaction receipt on Base, returning human-readable calldata including function signature and parameters, paid per-call in USDC via x402.
Price / call$0.01
Success—
StatusUnknown
How this service works
Keyless off-chain and on-chain data for AI agents. No API key, no signup - payment is the only gate. Pay-per-call in USDC on Base via x402.
Output
A JSON object containing the raw transaction receipt (to, from, value, status, gasUsed, blockNumber) plus decoded calldata showing the function signature and its parameter values, along with a confidence score and asset identifier.
Example use cases
Verify on-chain contract interaction
“Hey, can you look up transaction 0x4f8a2c...b91e on Base and tell me exactly what function was called and what parameters were passed in? I want to confirm a user actually executed the right contract method.”
Audit a suspicious DeFi transaction
“I just saw this Base transaction — 0xd3e7f1...a02b — flagged in our monitoring dashboard. Can you decode the calldata and tell me what it actually did on-chain, including the function name and all the input values?”
Debug a failed smart contract call
“Our smart contract call failed on Base with tx hash 0x9c12bd...7f43 — can you pull the transaction receipt and decode the calldata so I can see what function was invoked and whether the parameters look correct?”
Technical details
Endpoint
GEThttps://lion-x402.lionmaster-operations.workers.dev/api/x402/tx-receipt-decoded-jsonWhen to prefer
Choose this endpoint when you need to decode Base (EVM) transaction receipts into human-readable function calls without managing API keys or subscriptions — especially useful for AI agents that pay per-call via x402 USDC micropayments and need to understand what a specific transaction actually did on-chain.
Side effects
- Invalid or non-existent transaction hash returns error or empty receipt
- Payment not completed via x402 returns 402 Payment Required
- Unsupported JSON-RPC method returns error
- Transaction calldata cannot be decoded (e.g. no matching ABI) returns low confidence or raw hex
- Network congestion causes delayed response
- Batch size exceeds 10 requests returns rejection
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"tx": "0x...",
"network": "eip155:8453",
"receipt": {
"to": "0x...",
"from": "0x...",
"value": "0x0",
"status": "0x1",
"gasUsed": "0x...",
"blockNumber": "0x..."
},
"asset_id": "LION_TX_RECEIPT_DECODED_001",
"confidence": 0.9,
"decoded_calldata": {
"sig": "transfer(address,uint256)",
"params": [
"0x...",
"1000000000000000000"
]
}
}
}Tags
x402
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