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SignalHarness NFT Duplicate Media Hash Detector
x402
SignalHarness NFT Duplicate Media Hash Detector is a paid API for AI agents from signalharness.ai, paid per call via x402, $0.005/call, status unknown (last checked 2026-09-13).
Detects duplicate media hashes across a supplied set of NFT media data, identifying NFTs that share identical underlying media content.
Price / call$0.005
Success—
StatusUnknown
How this service works
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Output
Returns a JSON object containing a 'duplicate_media_hashes' field listing any detected duplicates, a list of warnings, an evidence scope indicating the data was caller-supplied, and a full receipt with payment and execution metadata including the service version, network, and a SHA-256 hash of the result.
Example use cases
NFT collection plagiarism audit
“I have a batch of NFT media hashes from a new collection I'm vetting — can you run them through the duplicate detector and tell me if any of the artwork is copy-minted or reused from other tokens?”
Marketplace listing integrity check
“Before we list these NFTs on the marketplace, can you scan their media hashes to make sure none of them are duplicates of each other or previously seen media?”
Collector portfolio deduplication
“I've got a set of NFT media hashes from my portfolio — can you identify any duplicates so I know if I accidentally bought the same underlying media twice under different token IDs?”
Technical details
Endpoint
POSThttps://signalharness.ai/api/agent/services/nft_duplicate_media_hashes/invokeWhen to prefer
Choose this endpoint when you need to programmatically detect whether multiple NFTs share identical underlying media content based on their hashes — particularly useful for NFT marketplace integrity checks, collection audits, anti-plagiarism workflows, or collector due diligence. It is purpose-built for the NFT media deduplication use case and returns structured evidence with a verifiable result hash, making it suitable for agent pipelines that require auditable outputs.
Side effects
- Malformed or empty nft_media_hash_request string returns validation error
- Input exceeding 65536 characters is rejected
- No duplicates found returns an empty duplicate_media_hashes result (not an error)
- Invalid JSON structure in the request body causes a parse failure
- Payment not received results in HTTP 402 response before execution
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| nft_media_hash_request | string |
Output
Schema · Response
{
"type": "json",
"example": {
"replay": false,
"result": {
"warnings": [
"Hashes are not computed from remote media and are trusted as supplied."
],
"service_id": "nft_duplicate_media_hashes",
"evidence_scope": "caller_supplied_data",
"duplicate_media_hashes": "{\"duplicate_groups\":[{\"media_hash\":\"0xaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa\",\"token_ids\":[\"1\",\"2\"]}],\"unique_hash_count\":1}"
},
"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": "nft_duplicate_media_hashes",
"executionId": "example-execution",
"startedAtMs": 0,
"amountAtomic": "5000",
"resultSha256": "2d64d044a6323f0e8de9ef4a5398a43609383184545fc96e0ec93c5efe107f46",
"serviceVersion": "1.0.0",
"settlementReference": "0x0000000000000000000000000000000000000000000000000000000000000000"
},
"artifacts": [],
"requestId": "example-request",
"executionId": "example-execution"
}
}Tags
x402
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