Query NFT ownership data via x402 micropayment on Base for $0.02 per request.
What it does
This endpoint at lowpaymentfee.com returns the owner of NFT #73 via a pay-per-call x402 protocol. The service accepts POST requests and settles payments in USDC on the Base network. The x402 challenge advertises a maxAmountRequired of 20,000 base units of USDC (6 decimals), which equals $0.02 per request. No API keys or rate limits are required — callers simply attach an X-PAYMENT header with a valid x402 payment proof.
The broader lowpaymentfee.com platform offers a suite of x402-gated APIs spanning data analytics, AI/ML inference (sentiment analysis, summarization, classification, embeddings), finance/Web3 data (price feeds, exchange rates, token quotes, gas estimates), and infrastructure utilities (geocoding, validation, conversion, generation). All endpoints are listed at $0.02 per request with the same pay-as-you-go model on Base.
This specific endpoint (/api/v1/nfts/73/owner) is narrowly scoped to returning NFT ownership information. The response MIME type is application/json. No OpenAPI schema or detailed documentation beyond the landing page listing was found, so the exact request body format and response structure are not documented. The endpoint is live and returns a proper 402 challenge when called without payment.
Capabilities
Use cases
- —Querying the current owner of a specific NFT programmatically
- —Integrating NFT ownership checks into agent workflows without API key management
- —Building on-chain data dashboards that verify NFT holders
Fit
Best for
- —Agents needing quick NFT ownership lookups with crypto micropayments
- —Developers who want keyless, pay-per-call NFT data access
- —Workflows on Base network that already hold USDC
Not for
- —Bulk enumeration of all NFT owners across a collection (single-NFT endpoint)
- —Users who need free or fiat-settled NFT data APIs
- —Querying NFTs on networks other than what this provider covers
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/nfts/73/owner \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402_payment_proof>"Endpoint
Quality
The endpoint is live and returns a valid x402 402 challenge, but there is no OpenAPI schema, no documented request/response format, and no example payloads. The NFT endpoint path is not even listed on the provider's landing page (only generic categories are shown). Effectively a stub with confirmed liveness.
Warnings
- —No OpenAPI or detailed documentation available for this endpoint
- —The specific /api/v1/nfts/73/owner path is not listed on the provider's landing page — only broader API categories are shown
- —Request body schema and response schema are unknown; no examples found
- —The endpoint appears hardcoded to NFT ID 73 — unclear if other IDs are supported via different paths
Citations
- —The x402 challenge advertises maxAmountRequired of 20000 base units of USDC on Base networkhttps://lowpaymentfee.com/api/v1/nfts/73/owner
- —All endpoints on lowpaymentfee.com are priced at $0.02 per request with no API keys, no rate limits, and instant access on Base networkhttps://lowpaymentfee.com
- —The platform offers APIs across Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure categorieshttps://lowpaymentfee.com
- —The USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Basehttps://lowpaymentfee.com/api/v1/nfts/73/owner