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 #45 via a pay-per-call x402 protocol. The endpoint accepts POST requests and settles payments 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 hosts a broader suite of APIs spanning data analytics, AI/ML inference (sentiment analysis, summarization, classification, embeddings), finance/Web3 (price feeds, exchange rates, token quotes, gas estimates), and infrastructure utilities (geocoding, validation, conversion, generation), all priced at $0.02 per request on the same x402 payment model. However, this specific listing covers only the `/api/v1/nfts/45/owner` endpoint, which appears to return NFT ownership information.
Documentation is minimal — the provider's site lists endpoints with short labels and prices but does not publish OpenAPI schemas, request/response examples, or detailed field descriptions. The endpoint is confirmed live (HTTP 402 challenge returned), but the actual response payload structure is unknown beyond the declared mimeType of application/json.
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
- —Agent-driven NFT portfolio analysis
Fit
Best for
- —Developers needing simple pay-per-call NFT ownership queries without API key management
- —AI agents that can settle x402 payments on Base
- —Low-volume or sporadic NFT data lookups where $0.02/call is cost-effective
Not for
- —Bulk or high-throughput NFT indexing (no batch endpoint documented)
- —Querying arbitrary NFT IDs (this endpoint is scoped to NFT #45 specifically)
- —Users who cannot settle USDC payments on the Base network
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/nfts/45/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 schema, no documented request body format, no response examples, and the endpoint is narrowly scoped to a single NFT ID with no explanation of what data is returned. Documentation is effectively absent.
Warnings
- —No OpenAPI or schema documentation available — request and response formats are unknown.
- —Endpoint is hardcoded to NFT #45; it is unclear whether other NFT IDs are queryable at different paths.
- —Provider site pages (/api, /pricing, /README) returned only a 'Connect wallet' prompt with no useful content.
- —The broader API suite listed on the homepage could not be verified beyond their listing cards.
Citations
- —The x402 challenge returns maxAmountRequired of 20000 base units of USDC (USD Coin) on the Base network.https://lowpaymentfee.com/api/v1/nfts/45/owner
- —All APIs on the platform are priced at $0.02 per request with no API keys, no rate limits, and instant access.https://lowpaymentfee.com
- —The USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913.https://lowpaymentfee.com/api/v1/nfts/45/owner