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 (token ID 20) 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 — consistent with the site's uniform $0.02/request pricing across all its API offerings.
The provider operates a broad catalog of x402-gated APIs spanning data analytics, AI/ML inference, finance/Web3 data, and infrastructure utilities, all at the same $0.02 price point. This particular endpoint sits in the NFT/Web3 category and returns JSON. No API keys or rate limits are advertised; access is granted purely through the x402 payment header mechanism using USDC on Base (contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913).
Documentation is minimal — the site provides no OpenAPI spec, no request/response schema details, and no example payloads beyond the endpoint listing. The endpoint is live (returns a proper 402 challenge), but the actual response format for a successful paid request is unknown from the available material.
Capabilities
Use cases
- —Querying the current owner of a specific NFT programmatically
- —Verifying NFT ownership as part of a token-gating workflow
- —Building dashboards that display NFT holder information
- —Automated agents checking NFT provenance before a transaction
Fit
Best for
- —Agents or apps needing quick, keyless NFT ownership checks
- —Developers who prefer pay-per-call over subscription API plans
- —Workflows already settled in USDC on Base
Not for
- —Bulk enumeration of all NFT owners in a collection (single-token endpoint)
- —Use cases requiring detailed NFT metadata beyond ownership
- —Users who need free or testnet access before committing funds
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/nfts/20/owner \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-header>"Endpoint
Quality
The endpoint is live and returns a valid x402 challenge with clear pricing, but there is no OpenAPI spec, no documented request/response schema, no examples, and the site pages beyond the landing are empty wallet-connect stubs. The actual behavior of the endpoint upon successful payment is entirely unknown.
Warnings
- —No OpenAPI or schema documentation available — request body and response format are unknown
- —Site documentation pages (/api, /pricing, /README) return only a wallet-connect prompt with no content
- —The specific endpoint path (/api/v1/nfts/20/owner) is not listed on the provider's landing page catalog, raising questions about its discoverability and support status
- —No information on what data source backs the NFT ownership lookup
Citations
- —The x402 challenge advertises maxAmountRequired of 20000 base units of USDC on Basehttps://lowpaymentfee.com/api/v1/nfts/20/owner
- —USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913https://lowpaymentfee.com/api/v1/nfts/20/owner
- —All APIs on the site are priced at $0.02 per request with no API keys or rate limitshttps://lowpaymentfee.com