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Polygon Event Sequence Analyzer
x402
Polygon Event Sequence Analyzer is a paid API for AI agents from signalharness.ai, paid per call via x402, $0.015/call, status unknown (last checked 2026-09-13).
Analyzes and deterministically orders a supplied set of Polygon PoS blockchain events by block number, transaction index, and log index to detect ambiguous ordering.
Price / call$0.015
Success—
StatusUnknown
How this service works
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Output
Returns a JSON analysis containing the ordered list of events with their source indexes, an ambiguous_order boolean flag, total event count, network context (accepted chain IDs, bridge model, completion policy, protocol family), and any warnings about index-dependent ordering. Also returns the analyzed network identifier and evidence scope.
Example use cases
DeFi protocol event audit
“I collected a series of swap and transfer events from a Polygon DeFi contract and I need to know if they're in the correct on-chain sequence — can you analyze these events and flag any ordering ambiguity?”
Bridge state sync verification
“We're verifying a Polygon root-child bridge state sync and have a batch of events from chain ID 137 — can you check whether the event sequence is unambiguous and give me the sorted order with any warnings?”
NFT mint order dispute resolution
“Two NFT mints happened in the same block on Polygon and a buyer is disputing which came first — I have the block number, transaction index, and log index for both events, can you determine the definitive sequence?”
Technical details
Endpoint
POSThttps://signalharness.ai/api/agent/services/polygon_event_sequence_analyze/invokeWhen to prefer
Choose this endpoint when you need deterministic, rule-based sequencing of Polygon PoS blockchain events from caller-supplied data — without making live RPC calls to a node. Ideal when you already have raw event data and need to verify or sort it by canonical on-chain ordering (block → tx index → log index). Prefer this over generic blockchain indexers when you need explicit ordering ambiguity detection and network-context metadata for Polygon PoS or Amoy testnet (chain IDs 137 and 80002).
Side effects
- Supplied event data missing required indexes (block_number, log_index, transaction_index) causing warnings or incorrect ordering
- Events from unsupported chain IDs (only 137 and 80002 accepted) may fail validation
- Malformed request_json string causing parse errors
- Ambiguous ordering flagged when events share identical block, transaction, and log index values
- Empty event array returning zero-count result with no sequence
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| request_json | string |
Output
Schema · Response
{
"type": "json",
"example": {
"replay": false,
"result": {
"warnings": [
"Ordering depends on supplied indexes."
],
"service_id": "polygon_event_sequence_analyze",
"analysis_json": "{\"ambiguous_order\":false,\"count\":1,\"events\":[{\"_source_index\":0,\"address\":\"0x0000000000000000000000000000000000000001\",\"block_number\":1,\"chain\":\"137\",\"log_index\":0,\"transaction_index\":0}],\"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\"}}",
"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_event_sequence_analyze",
"executionId": "example-execution",
"startedAtMs": 0,
"amountAtomic": "15000",
"resultSha256": "6d330a8c3eb84f1f9c1efa0e8f9b218582f8492f382e3b9090c03d3b226f55fb",
"serviceVersion": "1.0.0",
"settlementReference": "0x0000000000000000000000000000000000000000000000000000000000000000"
},
"artifacts": [],
"requestId": "example-request",
"executionId": "example-execution"
}
}Tags
x402
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