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Polygon Calldata Inspector
x402
Polygon Calldata Inspector is a paid API for AI agents from signalharness.ai, paid per call via x402, $0.01/call, status unknown (last checked 2026-09-13).
Decodes and analyzes raw Ethereum/Polygon calldata, extracting the function selector, name, arguments, and network context for a given transaction payload.
Price / call$0.01
Success—
StatusUnknown
How this service works
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Output
Returns a JSON analysis containing the decoded function name, 4-byte selector, list of decoded arguments, total calldata byte length, and Polygon network context (accepted chain IDs, bridge model, completion policy, protocol family). Also includes any warnings about limitations such as no on-chain ABI simulation, plus execution metadata (service ID, status, receipt, requestId).
Example use cases
Auditing a suspicious Polygon transaction
“I've got this raw calldata from a Polygon transaction I'm auditing: `0xa9059cbb000000000000000000000000abcdef1234567890abcdef1234567890abcdef12000000000000000000000000000000000000000000000000000000000000c350`. Can you decode it and tell me what function is being called and with what arguments?”
Smart contract debugging
“My smart contract call on Polygon is failing and I need to understand what's encoded in this calldata blob: `0x23b872dd000000000000000000000000...`. Can you inspect it and break down the function name, selector, and all the parameters?”
Transaction monitoring pipeline
“For each of these raw calldata strings coming from Polygon mempool transactions, can you decode them to identify which ERC-20 or NFT functions are being invoked and extract their arguments so I can filter for high-value transfers?”
Technical details
Endpoint
POSThttps://signalharness.ai/api/agent/services/polygon_calldata_inspect/invokeWhen to prefer
Choose this endpoint when you need a fast, cheap ($0.01 USDC) programmatic way to decode raw Polygon calldata without running a full Ethereum node or relying on a block explorer UI. Ideal for agents building transaction monitoring pipelines, security auditors inspecting suspicious calldata, or developers debugging smart contract interactions on Polygon PoS or Amoy testnet. Not suited for on-chain ABI verification or live transaction simulation.
Side effects
- Malformed or non-hex calldata string causes parsing failure
- Calldata shorter than 4 bytes (no selector) may not be decodable
- Unknown or non-standard function selectors return unrecognized function names
- ABI is not authenticated or simulated — decoded output is caller-supplied data only
- Invalid JSON in request_json field causes schema validation error
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| request_json | string |
Output
Schema · Response
{
"type": "json",
"example": {
"replay": false,
"result": {
"warnings": [
"Does not simulate or authenticate the ABI."
],
"service_id": "polygon_calldata_inspect",
"analysis_json": "{\"args\":[\"0x0000000000000000000000000000000000000002\",\"100\"],\"calldata_bytes\":68,\"function_name\":\"transfer\",\"network_context\":{\"accepted_chain_ids\":[\"137\",\"80002\"],\"bridge_model\":\"root-child state sync plus checkpoint evidence\",\"completion_policy\":\"never inferred without supplied evidence\",\"protocol_family\":\"Polygon PoS\"},\"selector\":\"0xa9059cbb\"}",
"evidence_scope": "caller_supplied_data",
"analyzed_network": "polygon"
},
"status": "succeeded",
"receipt": {
"asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"usage": [],
"status": "succeeded",
"network": "eip155:8453",
"artifacts": [],
"endedAtMs": 0,
"latencyMs": 0,
"paymentId": "example-payment",
"receiptId": "example-receipt",
"requestId": "example-request",
"serviceId": "polygon_calldata_inspect",
"executionId": "example-execution",
"startedAtMs": 0,
"amountAtomic": "10000",
"resultSha256": "57bf5fb5a790314f97c10c7ceb5db09e5c9abd77a24210c51344d667c5544932",
"serviceVersion": "1.0.0",
"settlementReference": "0x0000000000000000000000000000000000000000000000000000000000000000"
},
"artifacts": [],
"requestId": "example-request",
"executionId": "example-execution"
}
}Tags
x402
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