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/8/owner

What it does

This endpoint at lowpaymentfee.com returns NFT ownership information for a specific NFT (token ID 8) 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 (lowpaymentfee.com) hosts a broader suite of pay-per-call APIs spanning data analytics, AI/ML inference (sentiment analysis, summarization, classification, embeddings), finance/Web3 data (price feeds, exchange rates, token quotes, gas estimates), and infrastructure utilities (geocoding, validation, conversion, generation). All endpoints are listed at $0.02 per request with the same x402 payment model on Base.

This specific endpoint (/api/v1/nfts/8/owner) is narrowly scoped: it returns the owner of NFT #8. There is no documentation on what NFT collection this refers to, what the response schema looks like, or whether other token IDs are supported at similar paths. The endpoint is confirmed live (402 challenge captured), but the lack of OpenAPI schema, response examples, or detailed docs limits confidence in what exactly is returned.

Capabilities

nft-ownership-lookupx402-micropaymentusdc-settlementbase-networkpay-per-callno-api-key

Use cases

  • —Querying the current owner of a specific NFT programmatically
  • —Integrating NFT ownership checks into automated agent workflows
  • —Verifying NFT ownership without managing API keys or subscriptions

Fit

Best for

  • —Agents needing one-off NFT ownership lookups with instant crypto payment
  • —Developers exploring x402 protocol integrations on Base
  • —Low-friction, keyless access to NFT metadata

Not for

  • —Bulk NFT collection enumeration or batch ownership queries
  • —Users who need detailed NFT metadata beyond ownership (traits, images, history)
  • —Non-crypto users who cannot settle payments in USDC on Base

Quick start

curl -X POST https://lowpaymentfee.com/api/v1/nfts/8/owner \
  -H "X-PAYMENT: <x402-payment-proof>" \
  -H "Content-Type: application/json"

Endpoint

URLhttps://lowpaymentfee.com/api/v1/nfts/8/owner
Transporthttp
Protocolx402
Pay to0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3
CurrencyUSD COIN

Quality

0.35/ 1.00

The endpoint is confirmed live via a valid 402 challenge, and pricing is clear ($0.02 USDC on Base). However, there is no OpenAPI schema, no response examples, no documentation on what NFT collection is queried, and no details on the response format. The crawled pages beyond the homepage returned only 'Connect wallet' with no useful content. This is effectively a stub listing.

Warnings

  • —No OpenAPI or response schema available — response format is unknown
  • —No documentation on which NFT collection token ID 8 belongs to
  • —No indication whether other token IDs are queryable at similar paths
  • —Provider pages (/api, /pricing, /README) returned no useful content beyond 'Connect wallet'

Citations

Provenance

Indexed fromx402_bazaar
Enriched2026-04-22 00:35:47Z · anthropic/claude-opus-4.6 · v2
First seen2026-04-21
Last seen2026-04-22

Agent access

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