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SignalHarness Polygon Contract Interaction Summary
x402
SignalHarness Polygon Contract Interaction Summary is a paid API for AI agents from signalharness.ai, paid per call via x402, $0.02/call, status unknown (last checked 2026-09-15).
Analyzes a Polygon PoS transaction to extract contract interactions, token transfers, event logs, and function selectors into a structured summary.
Price / call$0.02
Success—
StatusUnknown
How this service works
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Output
Returns a JSON analysis including the transaction hash, list of interacted contract addresses, function selectors called, total call count, token transfer flow with ledger entries and transfer count, event log count, and Polygon network context (chain IDs, bridge model, protocol family). Also includes evidence scope, analyzed network name, and a warnings notice that intent and safety are not inferred.
Example use cases
DeFi trade audit for compliance
“I need to audit Polygon transaction 0xdef456... — tell me which smart contracts were involved, what function selectors were called, how many token transfers occurred, and give me the full interaction summary so I can verify it matches our expected DeFi swap flow.”
Debug failed smart contract call
“This Polygon transaction 0x789abc... didn't do what I expected — can you extract the contract addresses that were hit, the selectors that were invoked, and any event logs so I can figure out where it went wrong?”
Token transfer flow reconstruction
“For Polygon transaction 0x111222..., can you reconstruct the token transfer flow — which contracts passed tokens to which addresses, how many transfers total, and what the ledger looks like?”
Technical details
Endpoint
POSThttps://signalharness.ai/api/agent/services/polygon_contract_interaction_summary/invokeWhen to prefer
Choose this endpoint when you need a structured, machine-readable breakdown of a specific Polygon PoS transaction — particularly for extracting contract addresses, function selectors, and token transfer flows without writing your own decoder. Prefer it over raw RPC calls when you want a pre-parsed summary ready for agent consumption. Best for Polygon mainnet (chain 137) and Amoy testnet (chain 80002). Not suitable for Ethereum mainnet, other EVM chains, or cases where you need intent inference or safety classification.
Side effects
- Invalid or malformed transaction JSON returns an error
- Transaction hash not found on Polygon PoS or Amoy testnet returns empty or error result
- Unsupported chain ID (non-137/80002) may be rejected or produce no network context
- Overly large request_json exceeding 65536 characters returns a validation error
- Payment failure (insufficient USDC balance) prevents execution
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| request_json | string |
Output
Schema · Response
{
"type": "json",
"example": {
"replay": false,
"result": {
"warnings": [
"Does not infer intent or safety."
],
"service_id": "polygon_contract_interaction_summary",
"analysis_json": "{\"call_count\":0,\"contracts\":[\"0x0000000000000000000000000000000000000002\",\"0x0000000000000000000000000000000000000001\"],\"flow\":{\"ledger\":[],\"transfer_count\":0},\"log_count\":1,\"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\"},\"selectors\":[\"0xa9059cbb\"],\"to\":\"0x0000000000000000000000000000000000000002\",\"transaction_hash\":\"0x1111111111111111111111111111111111111111111111111111111111111111\",\"value\":\"0\"}",
"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_contract_interaction_summary",
"executionId": "example-execution",
"startedAtMs": 0,
"amountAtomic": "20000",
"resultSha256": "bdd1a211145bcb4c12e1903f1d6e6d7085a11e06f0a97ff5597c51aacdd6f869",
"serviceVersion": "1.0.0",
"settlementReference": "0x0000000000000000000000000000000000000000000000000000000000000000"
},
"artifacts": [],
"requestId": "example-request",
"executionId": "example-execution"
}
}Tags
x402
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