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 (ID 90) 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 hosts a broader suite of APIs across data & analytics, AI/ML inference, finance/Web3, and infrastructure utilities, all priced at $0.02 per request with the same x402 payment model on Base. This specific endpoint falls under the NFT/Web3 category and likely returns the current owner address or ownership details for the queried NFT. The response MIME type is application/json.
Because there is no OpenAPI schema, no request/response body documentation, and no examples beyond the x402 challenge itself, the exact request body format and response structure are unknown. The endpoint is confirmed live (402 challenge returned successfully), and the root site loads with a 200 status.
Capabilities
Use cases
- —Look up the current owner of a specific NFT programmatically
- —Integrate NFT ownership checks into automated agent workflows
- —Verify NFT holder status before granting access or privileges
Fit
Best for
- —Agents needing on-demand NFT ownership data without managing API keys
- —Developers building Web3 apps that need pay-per-call NFT queries
- —Micropayment-based workflows on the Base network
Not for
- —Bulk or batch NFT ownership queries across many token IDs (only one NFT ID is exposed at this path)
- —Users who need free or subscription-based access rather than per-call payments
- —Querying NFTs on networks other than Base
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/nfts/90/owner \
-H "X-PAYMENT: <x402_payment_proof>" \
-H "Content-Type: application/json"Endpoint
Quality
The endpoint is confirmed live via a valid 402 challenge, but there is no OpenAPI schema, no documented request/response format, no examples, and the endpoint description is generic ('Premium API Access'). The specific NFT ID (90) is hardcoded in the path with no documentation on what it represents. Effectively a stub listing.
Warnings
- —No OpenAPI or schema documentation available for request or response bodies
- —The endpoint path is hardcoded to NFT ID 90; it is unclear whether other NFT IDs are queryable at similar paths
- —No crawled documentation beyond a landing page listing; /api, /pricing, and /README pages all returned only 'Connect wallet'
- —The exact data returned by this endpoint is unknown — 'NFT owner' is inferred from the URL path only
Citations
- —The x402 challenge returns maxAmountRequired of 20000 base units of USDC (USD Coin) on the Base networkhttps://lowpaymentfee.com/api/v1/nfts/90/owner
- —USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Basehttps://lowpaymentfee.com/api/v1/nfts/90/owner
- —All APIs on the platform are priced at $0.02 per request with no API keys, no rate limits, and instant access on the Base networkhttps://lowpaymentfee.com