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 (ID 4) 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 (sentiment analysis, summarization, classification, embeddings), finance/Web3 data (price feeds, exchange rates, token quotes, gas estimates), and infrastructure utilities (geocoding, validation, conversion, generation). All endpoints are uniformly priced at $0.02 per request and settle on the Base network using USDC.
This specific endpoint (/api/v1/nfts/4/owner) appears to return the current owner of NFT #4. The response MIME type is application/json. No detailed input or output schema documentation was found beyond the x402 challenge metadata, so the exact request body format and response fields are not confirmed.
Capabilities
Use cases
- —Querying the current owner of a specific NFT programmatically
- —Integrating NFT ownership checks into agent workflows without API key management
- —Building on-chain data dashboards that verify NFT holders
Fit
Best for
- —Agents needing quick NFT ownership lookups with no signup
- —Developers prototyping x402 payment flows on Base
- —Applications requiring per-call billing without subscriptions
Not for
- —Bulk NFT collection scans across thousands of token IDs
- —Historical ownership or transfer history queries (not indicated by this endpoint)
- —Users who cannot transact in USDC on the Base network
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/nfts/4/owner \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402_payment_proof>"Endpoint
Quality
The endpoint is live (402 challenge captured) with clear pricing ($0.02 USDC on Base), but there is no OpenAPI schema, no documented request/response format, and no examples. The endpoint path suggests NFT ownership data but specifics are inferred from the URL alone.
Warnings
- —No OpenAPI or detailed schema documentation available for this endpoint.
- —Exact request body format and response fields are unknown — only the x402 challenge metadata was captured.
- —The endpoint is scoped to a single NFT ID (4); it is unclear whether other NFT IDs are supported at different paths.
- —Crawled /api, /pricing, and /README pages returned only 'Connect wallet' with no useful content.
Citations
- —The endpoint returns HTTP 402 with an x402 challenge advertising maxAmountRequired of 20000 base units of USDC on Base network.https://lowpaymentfee.com/api/v1/nfts/4/owner
- —USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base.https://lowpaymentfee.com/api/v1/nfts/4/owner
- —All endpoints on lowpaymentfee.com 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 provider offers APIs across data analytics, AI/ML, finance/Web3, and infrastructure categories.https://lowpaymentfee.com