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 (token ID 42) 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 pay-per-call APIs spanning data analytics, AI/ML inference, finance/Web3 data, and infrastructure utilities, all priced at $0.02 per request on the Base network. This specific endpoint falls under the NFT/Web3 category. The response MIME type is application/json.
Note that the endpoint path is hardcoded to NFT ID 42; it is unclear from available documentation whether other NFT IDs are supported via different paths or parameters. No OpenAPI schema, detailed request/response documentation, or example payloads were found in the crawl. The endpoint is confirmed live (returns 402 challenge as expected for x402).
Capabilities
Use cases
- —Querying the current owner of a specific NFT programmatically
- —Integrating NFT ownership checks into automated agent workflows
- —Verifying NFT holder status without running a full node or indexer
Fit
Best for
- —Agents needing quick NFT ownership lookups with no signup
- —Micropayment-based access to Web3 data without API keys
- —Low-friction, pay-as-you-go NFT data retrieval on Base
Not for
- —Bulk querying of thousands of NFTs (no batch endpoint documented)
- —Historical ownership or transfer history lookups (not indicated)
- —Free-tier or subscription-based access needs
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/nfts/42/owner \
-H "X-PAYMENT: <x402-payment-proof>" \
-H "Content-Type: application/json"Endpoint
Quality
The endpoint is confirmed live with a valid x402 402 challenge, and pricing is clear ($0.02 USDC on Base). However, there is no OpenAPI schema, no request/response examples, and no documentation beyond the landing page listing. The specific functionality (NFT owner lookup) is inferred from the URL path alone.
Warnings
- —No OpenAPI or detailed API documentation found for this endpoint.
- —No example request or response payloads available — actual response schema is unknown.
- —Endpoint path is hardcoded to NFT ID 42; unclear if other IDs are supported.
- —Crawled /api, /pricing, and /README pages returned only 'Connect wallet' with no useful content.
Citations
- —Endpoint returns 402 with x402 challenge advertising maxAmountRequired of 20000 base units of USDC on Base networkhttps://lowpaymentfee.com/api/v1/nfts/42/owner
- —USDC asset contract on Base: 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913https://lowpaymentfee.com/api/v1/nfts/42/owner
- —All APIs priced at $0.02 per request with no API keys, no rate limits, and instant access on Base networkhttps://lowpaymentfee.com