Query NFT ownership data via x402 micropayment on Base for $0.02 per request.
What it does
This endpoint at lowpaymentfee.com returns the owner of NFT #22 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 suite of x402-gated APIs spanning data analytics, AI/ML inference, finance/Web3 data, and utility services, all priced at $0.02 per request on the Base network. This specific endpoint (`/api/v1/nfts/22/owner`) appears to be an NFT ownership lookup, though the response schema is not documented beyond a mimeType of application/json. The endpoint is live and returns a proper 402 challenge when called without payment.
Because there is no OpenAPI spec, no documented request/response schema, and no usage examples beyond the x402 challenge itself, the exact fields returned in a successful response are unknown. The NFT ID (22) is hard-coded in the URL path, suggesting each NFT may have its own endpoint or the path may accept variable IDs — this is not confirmed by available documentation.
Capabilities
Use cases
- —Querying the current owner of a specific NFT programmatically
- —Integrating NFT ownership checks into agent workflows without API key management
- —Verifying NFT ownership as part of a gating or access-control flow
Fit
Best for
- —Agents needing quick, keyless NFT ownership lookups
- —Developers building x402-native payment flows on Base
- —Low-volume, pay-as-you-go NFT data queries
Not for
- —Bulk NFT metadata or collection-wide queries (only one NFT ID visible in the path)
- —Users who need detailed NFT metadata beyond ownership (traits, images, history)
- —Non-crypto-native callers who cannot produce x402 payment proofs
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/nfts/22/owner \
-H "X-PAYMENT: <x402_payment_proof>" \
-H "Content-Type: application/json"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 or response schema, no usage examples, and the provider's docs pages all just show 'Connect wallet'. The specific functionality (NFT owner lookup) is inferred solely from the URL path.
Warnings
- —No OpenAPI or schema documentation available — request and response formats are unknown.
- —The NFT ID 22 is hard-coded in the URL; it is unclear whether other IDs are supported or how to parameterize.
- —Provider docs pages (/api, /pricing, /README) return only 'Connect wallet' with no useful content.
- —The endpoint description is generic ('Premium API Access') and does not describe the actual data returned.
Citations
- —The endpoint returns a 402 challenge with maxAmountRequired of 20000 base units of USDC on Base networkhttps://lowpaymentfee.com/api/v1/nfts/22/owner
- —USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Basehttps://lowpaymentfee.com/api/v1/nfts/22/owner
- —All APIs on the platform are priced at $0.02 per request with no API keys, no rate limits, and instant access on Base networkhttps://lowpaymentfee.com