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/71/owner

What it does

This endpoint at lowpaymentfee.com returns the owner of NFT #71 via a pay-per-call x402 protocol. The payment is settled in USDC on the Base network. The x402 challenge advertises a maxAmountRequired of 20,000 base units; since USDC uses 6 decimals, this equals $0.02 per request. No API keys, rate limits, or subscriptions are required — callers simply attach an X-PAYMENT header with a valid x402 payment proof.

The broader lowpaymentfee.com platform hosts a variety of x402-gated endpoints 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 and settle on the Base network in USDC.

This specific endpoint (/api/v1/nfts/71/owner) is a POST endpoint that returns JSON. The exact response schema is not documented, so the structure of the owner data returned is unknown. The endpoint is live and returning a proper 402 challenge as expected for x402 protocol.

Capabilities

nft-ownership-lookupx402-micropaymentusdc-paymentbase-networkpay-per-requestno-api-keyjson-response

Use cases

  • —Querying the current owner of a specific NFT programmatically
  • —Building NFT portfolio dashboards that need ownership verification
  • —Agent-driven workflows that need to verify NFT ownership before taking action

Fit

Best for

  • —Agents needing quick NFT ownership checks without API key setup
  • —Pay-per-use NFT data queries settled in USDC on Base
  • —Lightweight integrations that want to avoid subscription overhead

Not for

  • —Bulk enumeration of all NFT owners across a collection (single-NFT endpoint)
  • —Querying NFTs on networks other than Base
  • —Users who need detailed NFT metadata beyond ownership

Quick start

curl -X POST https://lowpaymentfee.com/api/v1/nfts/71/owner \
  -H "X-PAYMENT: <x402_payment_proof>" \
  -H "Content-Type: application/json"

Endpoint

URLhttps://lowpaymentfee.com/api/v1/nfts/71/owner
Transporthttp
Protocolx402
Pay to0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3
CurrencyUSD COIN

Quality

0.35/ 1.00

The endpoint is live and returns a valid x402 402 challenge, confirming it works. However, there is no OpenAPI schema, no documented request body format, no example response, and the endpoint path is hardcoded to NFT #71 with no indication of parameterization. The crawl pages beyond the homepage returned only 'Connect wallet' with no useful documentation.

Warnings

  • —No response schema or example response documented — the structure of the returned owner data is unknown.
  • —No request body schema documented — unclear what (if any) POST body is expected.
  • —Endpoint path is hardcoded to NFT #71; it is unclear whether other NFT IDs are supported or how to parameterize.
  • —Documentation pages (/api, /pricing, /README) returned no useful content beyond 'Connect wallet'.
  • —The platform lists many endpoint categories but none appear to have detailed docs.

Citations

Provenance

Indexed fromx402_bazaar
Enriched2026-04-21 23:52:26Z · anthropic/claude-opus-4.6 · v2
First seen2026-04-21
Last seen2026-04-22

Agent access

JSONhttps://clawmart.sh/api/listings/yq5wMZ
Query NFT ownership data via x402 micropayment on Base for $0.02 per request. — Clawmart · Clawmart