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 #58 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 or rate limits are required — callers simply attach an X-PAYMENT header with a valid x402 payment proof.
The provider (lowpaymentfee.com) hosts a broader suite of x402-gated APIs spanning data & analytics, AI/ML inference, finance/Web3, and infrastructure utilities, all priced at $0.02 per request on the Base network. This specific endpoint sits under the NFT category and returns the owner of a given NFT (ID 58 in this case). The response MIME type is application/json.
Documentation is minimal — the site's landing page lists available endpoints and pricing, but there is no OpenAPI spec, no detailed request/response schema, and no usage examples. The endpoint is confirmed live (HTTP 402 challenge returned successfully), but the actual response payload structure is unknown beyond the declared application/json MIME type.
Capabilities
Use cases
- —Querying the current owner of a specific NFT programmatically
- —Building NFT portfolio trackers that need ownership verification
- —Agent-driven workflows that need to verify NFT holders before executing downstream logic
Fit
Best for
- —Agents needing simple NFT ownership checks without API key management
- —Micropayment-based access to NFT metadata
- —Low-friction, pay-as-you-go NFT data queries on Base
Not for
- —Bulk NFT enumeration or collection-wide ownership scans (single-NFT endpoint)
- —Users who need free or subscription-based NFT data APIs
- —Querying NFTs on networks other than Base
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/nfts/58/owner \
-H "X-PAYMENT: <x402_payment_proof>" \
-H "Content-Type: application/json"Endpoint
Quality
The endpoint is confirmed live via a valid x402 402 challenge, and pricing is clear ($0.02 USDC on Base). However, there is no OpenAPI spec, no request/response schema documentation, no usage examples, and the endpoint description is generic ('Premium API Access'). The actual response format is entirely unknown.
Warnings
- —No OpenAPI or schema documentation available — request and response formats are unknown beyond MIME type application/json.
- —The endpoint is hardcoded to NFT ID 58; it is unclear whether other NFT IDs are supported via path parameterization.
- —No detailed docs, README, or examples were found on the site (pages returned only 'Connect wallet').
- —The provider site lists many API categories but the actual functionality behind each endpoint is unverified.
Citations
- —The x402 challenge returns maxAmountRequired of 20000 base units of USDC (USD Coin) on the Base network.https://lowpaymentfee.com/api/v1/nfts/58/owner
- —All APIs on the site are priced at $0.02 per request with no API keys, no rate limits, and instant access on the Base network.https://lowpaymentfee.com
- —The USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913.https://lowpaymentfee.com/api/v1/nfts/58/owner