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Polygon Checkpoint Data Inspector
x402
Polygon Checkpoint Data Inspector 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 extracts structured metadata from Polygon PoS checkpoint data supplied by the caller, including block range, Merkle root presence, and monotonicity checks.
Price / call$0.015
Success—
StatusUnknown
How this service works
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Output
Returns a structured JSON analysis of the supplied Polygon checkpoint data, including block count, start and end block numbers, monotonicity flag, Merkle root value and presence flag, accepted chain IDs (137 for mainnet, 80002 for Amoy testnet), bridge model description, signature verification status (always false — no on-chain verification performed), and any warnings. Also includes a receipt with payment ID, execution timing, and a SHA-256 hash of the result.
Example use cases
Validate checkpoint block range integrity
“I've got a Polygon checkpoint data blob from block 500000 to 500050 — can you inspect it and confirm the block count, that the sequence is monotonic, and whether the root hash is actually present in there?”
Parse checkpoint for bridge audit
“I'm auditing a Polygon root-child state sync checkpoint for our bridge reconciliation — can you pull out the network context, chain IDs, and Merkle root from this checkpoint JSON I'm passing you?”
Debug malformed checkpoint submission
“This Polygon checkpoint JSON we received doesn't look right — can you run it through the inspector and tell me what block range it covers and whether there are any warnings about missing or invalid fields?”
Technical details
Endpoint
POSThttps://signalharness.ai/api/agent/services/polygon_checkpoint_data_inspect/invokeWhen to prefer
Choose this endpoint when you need to programmatically parse and extract structured metadata from a Polygon PoS checkpoint payload you already have in hand — especially block range, root presence, and network context — without needing on-chain signature verification or finality confirmation. It is ideal for offline analysis, bridge auditing, or debugging checkpoint data at $0.015 per call.
Side effects
- Malformed or non-JSON input in request_json returns an error or unexpected analysis
- Checkpoint data missing required fields may produce warnings rather than a hard error
- No signature verification is performed — the service explicitly warns it does not verify Ethereum inclusion or finalized checkpoint status
- Unsupported chain IDs outside 137/80002 may yield incomplete network context
- Oversized payloads exceeding 65536 characters will be rejected by schema validation
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| request_json | string |
Output
Schema · Response
{
"type": "json",
"example": {
"replay": false,
"result": {
"warnings": [
"Does not verify signatures, Ethereum inclusion, or finalized checkpoint status."
],
"service_id": "polygon_checkpoint_data_inspect",
"analysis_json": "{\"block_count\":\"10\",\"end_block\":\"10\",\"monotonic\":true,\"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\"},\"root\":\"0x1111111111111111111111111111111111111111111111111111111111111111\",\"root_present\":true,\"signature_verification_performed\":false,\"start_block\":\"1\"}",
"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_checkpoint_data_inspect",
"executionId": "example-execution",
"startedAtMs": 0,
"amountAtomic": "15000",
"resultSha256": "9f8e0105cbda7f86c3461e9c46a9d62f6b72478c1ed3e514b996a9ff1df08cb4",
"serviceVersion": "1.0.0",
"settlementReference": "0x0000000000000000000000000000000000000000000000000000000000000000"
},
"artifacts": [],
"requestId": "example-request",
"executionId": "example-execution"
}
}Tags
x402
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