NFT ownership lookup 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 30) via a POST request. It is part of a broader suite of x402-enabled APIs offered by the same provider, spanning data analytics, AI/ML inference, finance/Web3, and infrastructure utilities. All endpoints on the platform share a uniform $0.02-per-request pricing model settled in USDC on the Base network.
The x402 challenge is live and returns a 402 Payment Required response with an exact-scheme payment challenge. The required payment is 20,000 base units of USDC (contract 0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimal places. Payment is made to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a 300-second timeout. No API keys or rate limits are advertised; access is granted per-request upon payment.
Documentation is minimal. There is no OpenAPI spec, no request/response schema beyond the x402 outputSchema stub, and the crawled pages beyond the landing page returned only a "Connect wallet" prompt. The exact request body format and response structure for this NFT owner endpoint are not documented in the available material, so callers will need to experiment or contact the provider for details.
Capabilities
Use cases
- —Querying the current owner of a specific NFT programmatically
- —Verifying NFT ownership as part of a gating or access-control workflow
- —Building dashboards that display NFT holder information
Fit
Best for
- —Agents or apps needing quick, keyless NFT ownership checks
- —Developers who prefer pay-per-call over subscription API plans
- —x402-compatible wallets and agent frameworks on Base
Not for
- —Bulk enumeration of all NFT owners across large collections (no batch endpoint documented)
- —Users who need detailed NFT metadata beyond ownership
- —Anyone unable to settle USDC payments on the Base network
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/nfts/30/owner \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402_payment_token>"Endpoint
Quality
The x402 challenge is live and pricing is clear ($0.02 USDC on Base), but there is no OpenAPI spec, no documented request body schema, no example responses, and the crawled docs pages are empty beyond the landing page listing. The specific NFT endpoint's behavior must be inferred entirely from its URL path.
Warnings
- —No OpenAPI or request/response schema available for this endpoint
- —Crawled documentation pages (/api, /pricing, /README) returned no useful content
- —Request body format and response structure are undocumented — callers must experiment
- —This appears to be a demo/showcase site; the breadth of advertised endpoints (AI, finance, infrastructure) with uniform $0.02 pricing and no documentation raises questions about production readiness
Citations
- —The endpoint returns a 402 x402 challenge with maxAmountRequired of 20000 base units of USDC on Basehttps://lowpaymentfee.com/api/v1/nfts/30/owner
- —All listed APIs are priced at $0.02 per request with no API keys, no rate limits, and instant access on the Base networkhttps://lowpaymentfee.com
- —USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913https://lowpaymentfee.com/api/v1/nfts/30/owner