Query NFT ownership data via x402 micropayment on Base for $0.02 per request.
What it does
This endpoint at lowpaymentfee.com returns NFT ownership information for a specific NFT (ID 9) via a pay-per-call x402 protocol. The endpoint accepts POST requests and is settled 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, rate limits, or subscriptions are required — callers simply attach an X-PAYMENT header with a valid x402 payment proof.
The provider, lowpaymentfee.com, hosts a broader catalog of x402-gated APIs spanning data analytics, AI/ML inference, finance/Web3 data, and infrastructure utilities, all priced uniformly at $0.02 per request on Base. This specific endpoint (/api/v1/nfts/9/owner) appears to serve NFT owner lookup, though no detailed documentation or response schema was found in the crawl. The response MIME type is application/json.
Because no OpenAPI spec, request/response examples, or detailed documentation were discovered, the exact request body format and response structure are unknown. Callers should expect a JSON response containing owner address information for the queried NFT, but the precise fields are unconfirmed.
Capabilities
Use cases
- —Querying the current owner of a specific NFT programmatically
- —Verifying NFT ownership as part of a gating or access-control workflow
- —Building dashboards that display NFT holder information
Fit
Best for
- —Agents or apps that need on-demand NFT owner data without managing API keys
- —Low-volume, pay-as-you-go NFT ownership queries
- —Developers experimenting with x402 payment protocol integrations
Not for
- —Bulk or high-throughput NFT indexing (no batch endpoint documented)
- —Querying NFTs beyond ID 9 (only this specific resource path is confirmed)
- —Users who cannot settle payments in USDC on Base
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/nfts/9/owner \
-H "X-PAYMENT: <x402_payment_proof>" \
-H "Content-Type: application/json"Endpoint
Quality
The endpoint is live (402 challenge captured) and pricing is clear ($0.02 USDC on Base), but there is no OpenAPI spec, no request/response schema, no documentation beyond a landing page listing, and the specific functionality (NFT owner lookup for ID 9) is narrow and undocumented. Effectively a stub listing.
Warnings
- —No OpenAPI spec or detailed documentation found for this endpoint.
- —Request body format and response schema are unknown — no examples available.
- —The endpoint path is hardcoded to NFT ID 9; it is unclear whether other NFT IDs are supported via similar paths.
- —The broader lowpaymentfee.com catalog lists many endpoints but none had accessible documentation pages (all returned 'Connect wallet' only).
Citations
- —The endpoint returns HTTP 402 with an x402 challenge advertising USDC on Base at 20,000 base units ($0.02).https://lowpaymentfee.com/api/v1/nfts/9/owner
- —The provider advertises $0.02/request pricing with no API keys, no rate limits, and instant access on Base network.https://lowpaymentfee.com
- —The asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 is USDC on Base with 6 decimals.https://lowpaymentfee.com