x402basequality 0.35

Query NFT ownership data via x402 micropayment on Base for $0.02 per request.

Price
0.02 USDC / call
Protocol
x402
Verified
no
Endpoint
https://lowpaymentfee.com/api/v1/nfts/44/owner

What it does

This endpoint at lowpaymentfee.com returns NFT ownership information for NFT #44. 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 with no API keys, rate limits, or commitments required.

The specific endpoint `/api/v1/nfts/44/owner` accepts POST requests and returns JSON. Payment is handled via the x402 protocol: callers receive a 402 challenge containing the payment parameters (asset, amount, payTo address), construct an on-chain USDC payment on Base, and include the payment proof in the `X-PAYMENT` header. The max amount required is 20,000 base units of USDC (6 decimals), which equals $0.02. The payment timeout is 300 seconds.

No OpenAPI schema, detailed request/response documentation, or usage examples were found in the crawled material. The endpoint is live and returning a valid x402 challenge, but the actual data returned (NFT ownership details) and any required POST body fields are undocumented in the available sources. The provider's landing page confirms the platform concept and pricing but does not list this specific NFT endpoint among its advertised APIs, suggesting it may be an unlisted or supplementary route.

Capabilities

nft-ownership-queryx402-micropaymentusdc-paymentbase-networkpay-per-requestno-api-key

Use cases

  • —Querying the current owner of a specific NFT programmatically
  • —Verifying NFT ownership as part of a gating or access-control workflow
  • —Building dashboards or bots that track NFT holder changes

Fit

Best for

  • —Agents or apps needing on-demand NFT ownership data without API key management
  • —Micropayment-native workflows settling in USDC on Base
  • —Low-frequency, pay-per-call NFT data lookups

Not for

  • —Bulk or high-throughput NFT indexing across many collections (no batch endpoint documented)
  • —Users who cannot transact in USDC on the Base network

Quick start

curl -X POST https://lowpaymentfee.com/api/v1/nfts/44/owner \
  -H "Content-Type: application/json" \
  -H "X-PAYMENT: <x402_payment_proof>"

Endpoint

URLhttps://lowpaymentfee.com/api/v1/nfts/44/owner
Transporthttp
Protocolx402
Pay to0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3
CurrencyUSD COIN

Quality

0.35/ 1.00

The endpoint is live and returns a valid x402 challenge, confirming pricing and payment details. However, there is no OpenAPI schema, no documented request body format, no example responses, and the specific NFT endpoint is not listed on the provider's landing page. The actual data returned is unknown, making this effectively a stub listing.

Warnings

  • —No request or response schema documented — POST body requirements are unknown
  • —This specific NFT endpoint (/api/v1/nfts/44/owner) is not listed among the provider's advertised APIs on the landing page
  • —No OpenAPI spec or detailed documentation found anywhere on the site
  • —Crawled /api, /pricing, and /README pages returned only 'Connect wallet' with no useful content

Citations

Provenance

Indexed fromx402_bazaar
Enriched2026-04-22 00:47:08Z · anthropic/claude-opus-4.6 · v2
First seen2026-04-21
Last seen2026-04-22

Agent access

JSONhttps://clawmart.sh/api/listings/6rXGQZ
Query NFT ownership data via x402 micropayment on Base for $0.02 per request. — Clawmart · Clawmart