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Polygon ERC-721 Transfer Analyzer
x402
Polygon ERC-721 Transfer Analyzer 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).
Analyzes ERC-721 NFT transfer events on the Polygon PoS network from caller-supplied evidence, extracting structured transfer details including sender, recipient, token ID, and duplicate detection.
Price / call$0.01
Success—
StatusUnknown
How this service works
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Output
Returns a structured analysis JSON containing the list of ERC-721 transfers (each with from/to addresses, token ID, amount, index, operator, and transaction hash), detected duplicate positions, network context (accepted chain IDs, bridge model, completion policy, protocol family), the analyzed network name, evidence scope, any warnings (e.g. about ownership completeness), and a status field. Wrapped in a receipt with payment metadata.
Example use cases
NFT provenance audit for marketplace
“I have raw transfer event data for an ERC-721 NFT on Polygon mainnet — can you analyze it and give me a structured breakdown of the from/to addresses, token ID, and any duplicate transfer positions?”
Polygon NFT transfer dispute resolution
“A user is claiming they sent an NFT on Polygon but didn't receive it — can you analyze this ERC-721 transfer JSON I have and extract the full transfer details so I can verify what actually happened?”
Agent pipeline NFT movement tracking
“Parse this ERC-721 transfer evidence from the Polygon PoS network and return me the structured transfer list with sender, recipient, token ID, and the network context including accepted chain IDs.”
Technical details
Endpoint
POSThttps://signalharness.ai/api/agent/services/polygon_erc721_transfer_analyze/invokeWhen to prefer
Use this endpoint when you need to extract structured data from Polygon ERC-721 NFT transfer events from evidence you already have in hand. It is purpose-built for Polygon PoS (mainnet 137 and Amoy testnet 80002) and the ERC-721 standard specifically, with duplicate detection and network context included. Prefer this over general blockchain explorers when you need a deterministic, programmatic parse of transfer data within an agent pipeline. Not suitable for proving current ownership or querying live chain state — use a blockchain RPC for that.
Side effects
- Malformed or unparseable request_json returns an error status
- Missing required transfer fields in the input may produce null values in output
- Does not prove current NFT ownership — only analyzes caller-supplied evidence
- Unsupported chain ID outside Polygon PoS (137) and Amoy testnet (80002) may produce unexpected results
- Incomplete evidence produces warnings but does not infer missing completion data
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| request_json | string |
Output
Schema · Response
{
"type": "json",
"example": {
"replay": false,
"result": {
"warnings": [
"Does not prove current ownership or completeness."
],
"service_id": "polygon_erc721_transfer_analyze",
"analysis_json": "{\"duplicate_positions\":[],\"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\"},\"standard\":\"ERC-721\",\"total_units\":\"1\",\"transfers\":[{\"amount\":\"1\",\"from\":\"0x0000000000000000000000000000000000000001\",\"index\":0,\"log_index\":null,\"operator\":null,\"to\":\"0x0000000000000000000000000000000000000002\",\"token\":null,\"token_id\":\"0\",\"transaction_hash\":null}]}",
"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_erc721_transfer_analyze",
"executionId": "example-execution",
"startedAtMs": 0,
"amountAtomic": "10000",
"resultSha256": "f121f7050176d0b19d9806b9846b9324f287567a3095500aba08880f97265918",
"serviceVersion": "1.0.0",
"settlementReference": "0x0000000000000000000000000000000000000000000000000000000000000000"
},
"artifacts": [],
"requestId": "example-request",
"executionId": "example-execution"
}
}Tags
x402
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