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 #69 via a pay-per-call x402 protocol. The endpoint accepts POST requests and is settled on the Base network using USDC (contract 0x8335…2913). Each call costs a maximum of 20,000 base units of USDC, which equals $0.02 (USDC uses 6 decimals). No API keys, rate limits, or subscriptions are required — payment is handled inline via the X-PAYMENT header.
The provider site (lowpaymentfee.com) hosts a broader catalog of x402-gated APIs spanning data & analytics, AI/ML inference, finance/Web3, and infrastructure utilities, all priced at $0.02 per request on the Base network. This specific endpoint falls under the NFT/Web3 category and returns JSON. The output schema indicates it is discoverable and uses HTTP POST.
Documentation is minimal: there is no OpenAPI spec, no detailed request/response schema, and the crawled /api, /pricing, and /README pages only show a "Connect wallet" prompt with no additional content. The endpoint is confirmed live (402 challenge captured), but the actual response payload structure is unknown.
Capabilities
Use cases
- —Look up the current owner of a specific NFT programmatically
- —Integrate NFT ownership checks into agent workflows without API key management
- —Verify NFT holder status before granting access or rewards
Fit
Best for
- —Agents needing one-off NFT ownership queries with instant crypto payment
- —Developers prototyping x402 payment flows on Base
- —Low-volume NFT data lookups without subscription overhead
Not for
- —Bulk or batch NFT ownership queries across large collections
- —Users who cannot pay with USDC on the Base network
- —Applications requiring detailed NFT metadata beyond ownership
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/nfts/69/owner \
-H "X-PAYMENT: <x402_payment_token>" \
-H "Content-Type: application/json"Endpoint
Quality
The endpoint is confirmed live with a valid 402 challenge and clear pricing ($0.02 USDC on Base). However, there is no OpenAPI spec, no documented request body schema, no example response, and the crawled pages beyond the homepage are empty. The actual data returned is unknown, making this effectively a stub listing.
Warnings
- —No OpenAPI or schema documentation available — request and response formats are unknown
- —Crawled /api, /pricing, and /README pages returned only 'Connect wallet' with no useful content
- —The specific NFT queried (ID 69) is hardcoded in the URL; it is unclear whether other NFT IDs are supported or how to parameterize
- —No information on what collection or chain the NFT belongs to
Citations
- —Endpoint returns HTTP 402 with x402 challenge on POST, confirming it is livehttps://lowpaymentfee.com/api/v1/nfts/69/owner
- —Max amount required is 20000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base networkhttps://lowpaymentfee.com/api/v1/nfts/69/owner
- —All APIs on the site are priced at $0.02 per request with no API keys, no rate limits, and instant access on Basehttps://lowpaymentfee.com