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SignalHarness NFT URI Template Expander
x402
SignalHarness NFT URI Template Expander is a paid API for AI agents from signalharness.ai, paid per call via x402, $0.005/call, status unknown (last checked 2026-09-16).
Expands NFT URI templates by substituting variables to produce fully resolved NFT metadata URIs.
Price / call$0.005
Success—
StatusUnknown
How this service works
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Output
Returns the fully expanded NFT URI string with all template variables substituted, along with any warnings about the expansion, the service ID, and an evidence scope indicator confirming the data came from caller-supplied input. Also includes a full execution receipt with payment details, request and execution IDs, latency, and a SHA-256 hash of the result for verification.
Example use cases
Resolve NFT metadata URL for display
“I have an ERC-1155 token URI template 'https://api.example.com/token/{id}/metadata.json' and I need to expand it for token ID 137 so I can fetch the NFT's metadata.”
Validate NFT URI template expansion
“Can you expand this NFT URI template 'ipfs://QmAbcXyz/{id}' with token ID 5 and tell me if there are any warnings about the result?”
Batch NFT marketplace URI preparation
“I'm building an NFT marketplace and need to turn this raw token URI template 'https://nftstorage.example.com/collection/{id}.json' into an actual URL for token number 99 — can you expand it?”
Technical details
Endpoint
POSThttps://signalharness.ai/api/agent/services/nft_uri_template_expand/invokeWhen to prefer
Choose this endpoint when you need to programmatically resolve NFT URI templates into concrete, usable metadata URLs — especially for ERC-721 or ERC-1155 tokens where the URI contains placeholder variables like {id}. It is ideal for NFT marketplaces, wallets, or indexers that need to resolve token metadata URIs on the fly. At $0.005 USDC per call it is cost-effective for per-token resolution needs.
Side effects
- Invalid or malformed URI template string returns an error
- Template variables that cannot be resolved may generate warnings in the response
- Input string exceeding 65536 characters is rejected
- Input shorter than 2 characters is rejected
- Malformed JSON in the request body returns a parse error
- Network or service unavailability returns a non-200 response
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| nft_uri_request | string |
Output
Schema · Response
{
"type": "json",
"example": {
"replay": false,
"result": {
"warnings": [
"URI expansion does not fetch or validate content."
],
"service_id": "nft_uri_template_expand",
"evidence_scope": "caller_supplied_data",
"expanded_nft_uri": "{\"token_id_decimal\":\"1\",\"token_id_hex_64\":\"0000000000000000000000000000000000000000000000000000000000000001\",\"uri\":\"ipfs://example/0000000000000000000000000000000000000000000000000000000000000001\"}"
},
"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_uri_template_expand",
"executionId": "example-execution",
"startedAtMs": 0,
"amountAtomic": "5000",
"resultSha256": "539229320cad7ff6767b2176ba8c0a94484bbb2c4d9113e3b5d43d39b56c8fa4",
"serviceVersion": "1.0.0",
"settlementReference": "0x0000000000000000000000000000000000000000000000000000000000000000"
},
"artifacts": [],
"requestId": "example-request",
"executionId": "example-execution"
}
}Tags
x402
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