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/62/owner

What it does

This endpoint at lowpaymentfee.com returns the owner of NFT #62 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 or rate limits are required — callers simply attach an X-PAYMENT header with a valid x402 payment proof.

The endpoint accepts POST requests and returns JSON. It is part of a broader platform (lowpaymentfee.com) that offers dozens of pay-per-call APIs across categories including data analytics, AI/ML inference, finance/Web3, and infrastructure utilities, all priced at $0.02 per request. However, this specific endpoint is scoped to NFT owner lookups.

Documentation is minimal: there is no OpenAPI spec, no request/response schema beyond the x402 challenge's outputSchema stub, and the crawled pages beyond the landing page returned only wallet-connect prompts. The endpoint is confirmed live (402 challenge returned successfully), but the exact request body format and response structure are not documented in the available material.

Capabilities

nft-owner-lookupx402-micropaymentusdc-paymentbase-networkpay-per-callno-api-key

Use cases

  • —Look up the current owner of a specific NFT programmatically
  • —Verify NFT ownership as part of a gating or access-control workflow
  • —Integrate NFT owner data into dashboards or analytics pipelines

Fit

Best for

  • —Agents or apps needing on-demand NFT ownership checks without managing API keys
  • —Developers who want to pay per call in USDC on Base without subscriptions
  • —Automated workflows that need low-cost, low-friction NFT data access

Not for

  • —Bulk enumeration of all NFT owners across a collection (single-NFT endpoint, no batch support documented)
  • —Users who need detailed NFT metadata beyond ownership (traits, images, history)
  • —Applications requiring free or fiat-only payment rails

Quick start

curl -X POST https://lowpaymentfee.com/api/v1/nfts/62/owner \
  -H "X-PAYMENT: <x402_payment_proof>" \
  -H "Content-Type: application/json"

Endpoint

URLhttps://lowpaymentfee.com/api/v1/nfts/62/owner
Transporthttp
Protocolx402
Pay to0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3
CurrencyUSD COIN

Quality

0.35/ 1.00

The endpoint is confirmed live via a valid 402 challenge, but there is no OpenAPI spec, no documented request/response schema, and no examples. The crawled docs pages returned only wallet-connect stubs. The endpoint's purpose (NFT owner lookup) is inferred from the URL path alone.

Warnings

  • —No OpenAPI or request/response schema available — request body format and response structure are unknown.
  • —Endpoint path is hardcoded to NFT #62; it is unclear whether other NFT IDs are supported via parameterized paths.
  • —Documentation pages (/api, /pricing, /README) returned only 'Connect wallet' with no useful content.
  • —The broader platform advertises many API categories but none of the other endpoints were probed or verified.

Citations

Provenance

Indexed fromx402_bazaar
Enriched2026-04-21 23:46:20Z · anthropic/claude-opus-4.6 · v2
First seen2026-04-21
Last seen2026-04-22

Agent access

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