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 NFT #57. It is part of a broader platform offering pay-per-call APIs across data analytics, AI/ML inference, finance/Web3, and infrastructure categories — all settled via the x402 protocol on the Base network using USDC.
The specific endpoint `/api/v1/nfts/57/owner` accepts POST requests and returns JSON. Payment is handled inline via the X-PAYMENT header using the x402 exact-payment scheme. The maximum amount required is 20,000 base units of USDC (0.02 USD, since USDC uses 6 decimals). There are no API keys, no rate limits, and no upfront commitments — each call is independently paid for at the time of the request.
The platform advertises a uniform $0.02 per request pricing across all its endpoints. Settlement occurs on the Base L2 network to the address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 using the USDC contract at 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913. The endpoint is live and returning a proper 402 challenge. However, no documentation exists for the request body schema or the response format of this specific NFT owner endpoint, so the exact fields returned are unknown.
Capabilities
Use cases
- —Querying the current owner of a specific NFT programmatically
- —Building NFT portfolio dashboards that need on-demand ownership checks
- —Agent workflows that verify NFT ownership before executing downstream logic
Fit
Best for
- —Developers needing simple pay-per-call NFT ownership data without API key management
- —AI agents that can settle x402 payments on Base
- —Low-volume or sporadic NFT ownership queries where a subscription model is overkill
Not for
- —Bulk enumeration of all NFT owners across a collection (single-NFT endpoint, no batch support evident)
- —Users who cannot transact in USDC on the Base network
- —Applications requiring detailed NFT metadata beyond ownership
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/nfts/57/owner \
-H "X-PAYMENT: <x402-payment-token>" \
-H "Content-Type: application/json"Endpoint
Quality
The endpoint is live and returns a valid x402 402 challenge, confirming it is operational. However, there is no OpenAPI spec, no documentation for request/response schemas, and the crawled pages beyond the homepage are empty wallet-connect stubs. The specific NFT endpoint's purpose is only inferable from the URL path. This is effectively a stub listing.
Warnings
- —No request body schema documented — unclear what POST body (if any) is expected
- —No response schema documented — the shape of the returned NFT owner data is unknown
- —The endpoint is hardcoded to NFT #57; it is unclear whether other NFT IDs are supported at different paths
- —Crawled /api, /pricing, and /README pages returned no useful content (only 'Connect wallet')
- —No OpenAPI or ai-plugin manifest available
Citations
- —The endpoint returns a 402 challenge with maxAmountRequired of 20000 base units of USDC on Basehttps://lowpaymentfee.com/api/v1/nfts/57/owner
- —Uniform pricing of $0.02 per request across all endpoints, no API keys, no rate limitshttps://lowpaymentfee.com
- —USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base networkhttps://lowpaymentfee.com/api/v1/nfts/57/owner