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 12) via a POST request. It is part of a broader suite of pay-per-call APIs offered by lowpaymentfee.com, all settled on the Base network using USDC. The x402 protocol means no API keys or accounts are needed — callers attach a payment header and receive the response directly.
The specific endpoint `/api/v1/nfts/12/owner` costs $0.02 per request (20,000 base units of USDC with 6 decimals). Payment is made to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` using the USDC contract on Base (`0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913`). The response MIME type is `application/json`. The payment timeout is 300 seconds.
The provider also offers endpoints for analytics, AI/ML inference (sentiment analysis, summarization, classification, embeddings), finance/crypto data, and utility services, all at the same $0.02 per-request price point. Documentation beyond the landing page is sparse — the /api, /pricing, and /README pages all resolve to a wallet-connect prompt with no additional content. The exact schema of the NFT owner response is not documented.
Capabilities
Use cases
- —Looking up the current owner of a specific NFT programmatically
- —Integrating NFT ownership checks into agent workflows without API key management
- —Verifying NFT ownership as part of a gating or access-control flow
Fit
Best for
- —Agents needing quick NFT ownership lookups with no signup
- —Developers testing x402 payment flows on Base
- —Low-volume, pay-as-you-go NFT data queries
Not for
- —Bulk or batch NFT ownership queries across many token IDs (only token 12 is exposed at this URL)
- —Users who need detailed NFT metadata beyond ownership
- —Applications requiring free or subscription-based access
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/nfts/12/owner \
-H "X-PAYMENT: <x402_payment_header>" \
-H "Content-Type: application/json"Endpoint
Quality
The endpoint is live and returns a valid x402 402 challenge, confirming it accepts payments. However, there is no documentation of the request body schema, response schema, or what data is actually returned. The /api, /pricing, and /README pages are all empty wallet-connect prompts. The endpoint is hardcoded to a single NFT ID (12), and the description 'Premium API Access' is generic. This is effectively a stub listing.
Warnings
- —No response schema documented — the structure of the NFT owner response is unknown
- —No request body schema documented — unclear if a POST body is required or what fields it accepts
- —The endpoint path is hardcoded to NFT ID 12; it is unclear whether other NFT IDs are supported via different URLs
- —Documentation pages (/api, /pricing, /README) are empty beyond a wallet-connect prompt
- —The provider landing page lists many API categories but none appear to be NFT-related, making this endpoint's purpose ambiguous
Citations
- —The endpoint returns HTTP 402 with an x402 challenge requiring USDC payment on Basehttps://lowpaymentfee.com/api/v1/nfts/12/owner
- —maxAmountRequired is 20000 base units of USDC (6 decimals) = $0.02https://lowpaymentfee.com/api/v1/nfts/12/owner
- —Payment address is 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 and USDC asset is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913https://lowpaymentfee.com/api/v1/nfts/12/owner
- —All listed APIs are priced at $0.02 per request with no API keys, no rate limits, on Base networkhttps://lowpaymentfee.com