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 ID 15. It is part of a broader suite of x402-protocol pay-per-call APIs hosted on the same domain, spanning data analytics, AI/ML inference, finance/Web3, and utility services. All endpoints on the platform share a uniform $0.02 per-request pricing model settled in USDC on the Base network.
The specific endpoint `/api/v1/nfts/15/owner` accepts POST requests and returns JSON. Payment is handled via the x402 protocol: callers must include an `X-PAYMENT` header with a valid payment proof. The x402 challenge advertises a maxAmountRequired of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimal places. No API keys or rate limits are advertised; access is gated purely by micropayment.
Documentation is minimal — the landing page lists available endpoints with prices but provides no request/response schemas, parameter descriptions, or usage examples beyond the endpoint paths themselves. The NFT-specific endpoint is not listed on the homepage, suggesting it may be part of a larger NFT API surface that is not fully documented. The endpoint is live and returns a proper 402 challenge.
Capabilities
Use cases
- —Looking up the current owner of a specific NFT programmatically
- —Verifying NFT ownership as part of a gating or access-control workflow
- —Building dashboards or analytics that track NFT ownership changes
Fit
Best for
- —Agents or apps that need on-demand NFT ownership data without managing API keys
- —Micropayment-native workflows where per-call billing is preferred
- —Developers already operating on the Base L2 network with USDC
Not for
- —Bulk or batch NFT ownership queries across thousands of tokens (no documented batch endpoint)
- —Users who need detailed NFT metadata beyond ownership (traits, images, history)
- —Callers without a Base-network USDC wallet or x402-compatible client
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/nfts/15/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, confirming it is operational. However, there is no OpenAPI schema, no documented request/response format, no examples, and the NFT endpoint isn't even listed on the provider's homepage. The actual data returned is unknown.
Warnings
- —No request or response schema is documented; the shape of the returned JSON is unknown.
- —The /api/v1/nfts/15/owner endpoint is not listed on the provider's homepage — it may be undocumented or experimental.
- —No documentation pages rendered meaningful content (pricing, README, and /api pages all just show 'Connect wallet').
- —It is unclear whether this endpoint returns live on-chain data or static/mock data.
Citations
- —The endpoint returns HTTP 402 with an x402 challenge requiring USDC payment on Basehttps://lowpaymentfee.com/api/v1/nfts/15/owner
- —maxAmountRequired is 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913), equaling $0.02https://lowpaymentfee.com/api/v1/nfts/15/owner
- —The platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access on Base networkhttps://lowpaymentfee.com