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SignalHarness Polygon ERC20 Allowance Exposure Analyzer
x402
SignalHarness Polygon ERC20 Allowance Exposure Analyzer is a paid API for AI agents from signalharness.ai, paid per call via x402, $0.015/call, status unknown (last checked 2026-09-15).
Analyzes caller-supplied transaction evidence to identify and summarize ERC20 token approval/allowance exposures on the Polygon PoS network
Price / call$0.015
Success—
StatusUnknown
How this service works
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Output
Returns a structured JSON analysis including: a list of ERC20 approval events with owner, spender, token address, before/after allowance amounts, delta, and unlimited flag; a per-spender exposure summary aggregating total allowances; and network context including accepted chain IDs (Polygon mainnet 137 and testnet 80002), bridge model, and completion policy. Also includes the analyzed network ('polygon') and a note that the service does not query or revoke allowances — it only analyzes caller-supplied evidence.
Example use cases
DeFi wallet allowance audit
“I have some raw Polygon transaction data and I want to know what ERC20 allowances were granted — can you tell me which spenders got approved, by how much, and flag any unlimited approvals?”
Security review of on-chain approval events
“Can you parse this Polygon PoS transaction evidence and give me a breakdown of all token approval events, including the delta between before and after allowance amounts and a per-spender exposure summary?”
Agent-driven token risk assessment
“Before I proceed with this DeFi interaction on Polygon, analyze the supplied transaction logs and tell me if any ERC20 allowances look risky — especially any unlimited approvals to unknown spender addresses.”
Technical details
Endpoint
POSThttps://signalharness.ai/api/agent/services/polygon_erc20_allowance_exposure/invokeWhen to prefer
Choose this endpoint when you need to analyze ERC20 allowance exposures on Polygon PoS from caller-supplied transaction evidence — such as logs, receipts, or decoded events — rather than querying live blockchain state. It is ideal for post-hoc auditing of approval events, security reviews of DeFi interactions, or agent workflows that already have transaction data and need structured allowance summaries without making additional RPC calls.
Side effects
- Malformed or missing request_json causes parse failure
- Evidence JSON that does not contain recognizable ERC20 approval events returns empty approvals array
- Unsupported chain IDs (non-Polygon) may be rejected or produce incomplete results
- Overly large input JSON (>65536 characters) is rejected
- Service explicitly does not query live blockchain state — missing evidence yields no results
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| request_json | string |
Output
Schema · Response
{
"type": "json",
"example": {
"replay": false,
"result": {
"warnings": [
"Does not query or revoke allowances."
],
"service_id": "polygon_erc20_allowance_exposure",
"analysis_json": "{\"approvals\":[{\"after\":\"100\",\"before\":\"0\",\"delta\":\"100\",\"owner\":\"0x0000000000000000000000000000000000000001\",\"spender\":\"0x0000000000000000000000000000000000000002\",\"token\":\"0x0000000000000000000000000000000000000001\",\"unlimited\":false}],\"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\"},\"spender_exposure\":[{\"spender\":\"0x0000000000000000000000000000000000000002\",\"total_after\":\"100\",\"unlimited\":false}]}",
"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_erc20_allowance_exposure",
"executionId": "example-execution",
"startedAtMs": 0,
"amountAtomic": "15000",
"resultSha256": "ff633d2cd835b920b9b7eee2cf8c0beab8d24c21f7e85efbe500366840bffde0",
"serviceVersion": "1.0.0",
"settlementReference": "0x0000000000000000000000000000000000000000000000000000000000000000"
},
"artifacts": [],
"requestId": "example-request",
"executionId": "example-execution"
}
}Tags
x402
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