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 ID 14. It is part of a broader suite of x402-protocol 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 pricing model of $0.02 per request, settled in USDC on the Base network.
The specific endpoint `/api/v1/nfts/14/owner` accepts POST requests and is gated by the x402 payment protocol. When called without payment, it returns a 402 challenge specifying the accepted payment scheme (exact), the USDC asset contract on Base (0x8335…2913), and a maximum amount of 20,000 base units (i.e., $0.02 given USDC's 6 decimals). Payment is made to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a 300-second timeout window. The response MIME type is application/json.
No OpenAPI schema, detailed request/response documentation, or usage examples are provided by the site beyond the landing page listing. The endpoint appears live and correctly issues x402 challenges. However, the actual structure of the response payload (what fields describe the NFT owner) is undocumented, so consumers should expect to discover the schema empirically after making a paid request.
Capabilities
Use cases
- —Look up the current owner of a specific NFT (ID 14) programmatically
- —Integrate NFT ownership checks into agent workflows without API key management
- —Demonstrate x402 pay-per-call patterns for on-chain data retrieval
Fit
Best for
- —Agents or bots that need on-demand NFT ownership data without subscription commitments
- —Developers exploring x402 protocol integrations on Base
- —Low-volume, pay-as-you-go NFT data queries
Not for
- —Bulk or high-throughput NFT indexing across many token IDs (only serves NFT 14)
- —Users who need detailed NFT metadata beyond ownership
- —Applications requiring free or pre-paid API access patterns
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/nfts/14/owner \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402_payment_token>"Endpoint
Quality
The endpoint is live and returns a valid x402 challenge with clear pricing. However, there is no OpenAPI schema, no documented request body or response structure, no usage examples, and the endpoint is scoped to a single NFT ID. The provider's landing page is generic and other pages require wallet connection with no additional documentation.
Warnings
- —No OpenAPI or schema documentation available for request or response payloads
- —Endpoint is hardcoded to NFT ID 14; unclear if other NFT IDs are supported via different paths
- —Provider pages beyond the landing page require wallet connection and yield no useful documentation
- —Response payload structure is completely undocumented
Citations
- —The endpoint returns a 402 challenge with maxAmountRequired of 20000 base units in USDC on Base networkhttps://lowpaymentfee.com/api/v1/nfts/14/owner
- —All APIs on the platform are priced at $0.02 per request with no API keys, no rate limits, and instant access on Base networkhttps://lowpaymentfee.com
- —USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913https://lowpaymentfee.com/api/v1/nfts/14/owner