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 NFT #87. It is part of a broader platform offering dozens of pay-per-call API endpoints spanning data analytics, AI/ML inference, finance/Web3 data, and infrastructure utilities — all gated by the x402 payment protocol on the Base network.
The endpoint accepts POST requests and is secured via x402 with an "exact" payment scheme. Each call costs 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. Payment is sent to 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3. No API keys or rate limits are advertised; access is granted purely through the x402 payment header. The response MIME type is application/json.
The platform markets itself as a low-fee, no-commitment API marketplace. However, documentation is extremely sparse — there is no OpenAPI spec, no request/response schema beyond the x402 challenge metadata, and the crawled /api, /pricing, and /README pages all returned only a "Connect wallet" prompt with no substantive content. The actual structure of the NFT ownership response and the expected POST body are unknown. This specific endpoint (/nfts/87/owner) is not listed on the homepage's API catalog, so it may be an unlisted or example route.
Capabilities
Use cases
- —Look up the current owner of a specific NFT by ID
- —Verify NFT ownership as part of a gating or verification workflow
- —Integrate NFT ownership checks into an automated agent pipeline using x402 payments
Fit
Best for
- —Agents that need on-demand NFT ownership data without managing API keys
- —Developers experimenting with x402 micropayment-gated APIs
- —Quick, low-cost single-query NFT lookups on Base
Not for
- —Bulk or batch NFT ownership queries across many tokens (no batch endpoint documented)
- —Users who need detailed NFT metadata, traits, or transaction history beyond ownership
- —Anyone requiring comprehensive API documentation or SLAs before integration
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/nfts/87/owner \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402_payment_header>"Endpoint
Quality
The endpoint is live and returns a valid x402 402 challenge, confirming it is operational. However, there is no OpenAPI spec, no documented request body schema, no example responses, and the crawled pages beyond the homepage are empty. The specific NFT endpoint is not even listed in the site's own catalog. Pricing is clear ($0.02/request in USDC on Base), but everything else must be inferred.
Warnings
- —No OpenAPI or schema documentation available for this endpoint
- —No request body or response body examples found anywhere in crawled content
- —This specific endpoint (/api/v1/nfts/87/owner) is not listed on the provider's homepage API catalog — it may be an unlisted or demo route
- —All subpages (/api, /pricing, /README) returned only a wallet-connect prompt with no documentation
- —The actual data source for NFT ownership is unknown — unclear whether it queries on-chain data or a proprietary index
Citations
- —The endpoint returns a 402 x402 challenge with maxAmountRequired of 20000 base units of USDC on Basehttps://lowpaymentfee.com/api/v1/nfts/87/owner
- —USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913https://lowpaymentfee.com/api/v1/nfts/87/owner
- —Platform advertises $0.02 per request, no API keys, no rate limits, instant access on Base networkhttps://lowpaymentfee.com
- —The homepage lists API categories including Data & Analytics, AI & ML, Finance & Web3, and Infrastructure but does not list an NFT ownership endpointhttps://lowpaymentfee.com