x402basequality 0.35

NFT ownership lookup 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/80/owner

What it does

This endpoint at lowpaymentfee.com returns NFT ownership information for a specific NFT (ID 80) via a POST request. It is part of a broader suite of pay-per-call APIs offered by lowpaymentfee.com, all settling payments through the x402 protocol on the Base network using USDC.

The x402 challenge confirms the endpoint is live and accepts exact-scheme payments of up to 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 per request (USDC uses 6 decimals). Payment is sent to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a maximum timeout of 300 seconds. No API keys or rate limits are advertised — access is gated purely by the x402 payment header.

The provider's landing page lists many other endpoints across data/analytics, AI/ML, finance/Web3, and infrastructure categories, all at the same $0.02 price point. However, this specific listing covers only the `/api/v1/nfts/80/owner` endpoint. Documentation is minimal: there is no OpenAPI spec, no request/response schema beyond the x402 challenge's outputSchema stub, and the crawled /api, /pricing, and /README pages returned only a "Connect wallet" prompt with no additional detail. The actual response format for the NFT owner query is unknown.

Capabilities

nft-ownership-lookupx402-paymentusdc-base-settlementpay-per-requestno-api-key

Use cases

  • —Querying the current owner of a specific NFT programmatically
  • —Verifying NFT ownership as part of a token-gating workflow
  • —Building dashboards that display NFT holder information

Fit

Best for

  • —Agents or apps that need on-demand NFT ownership data without managing API keys
  • —Micropayment-friendly workflows where per-call billing is preferred
  • —Developers already operating on the Base network with USDC

Not for

  • —Bulk or batch NFT ownership queries across many token IDs (only one ID exposed here)
  • —Users who need detailed NFT metadata beyond ownership
  • —Anyone without a Base-network USDC wallet for x402 payments

Quick start

curl -X POST https://lowpaymentfee.com/api/v1/nfts/80/owner \
  -H "X-PAYMENT: <x402_payment_header>" \
  -H "Content-Type: application/json"

Endpoint

URLhttps://lowpaymentfee.com/api/v1/nfts/80/owner
Transporthttp
Protocolx402
Pay to0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3
CurrencyUSD COIN

Quality

0.35/ 1.00

The x402 challenge is live and pricing is clear ($0.02 USDC on Base), but there is no OpenAPI spec, no documented request body schema, no example responses, and the crawled pages beyond the landing page were empty. The endpoint's actual behavior and response format must be inferred entirely from its URL path.

Warnings

  • —No OpenAPI or schema documentation available — request and response formats are unknown
  • —The /api, /pricing, and /README pages returned no useful content beyond 'Connect wallet'
  • —This endpoint covers only NFT ID 80; it is unclear whether other NFT IDs are supported at different paths
  • —The provider lists many diverse API categories (AI, finance, infrastructure) at identical pricing, which may indicate placeholder or demo endpoints

Citations

Provenance

Indexed fromx402_bazaar
Enriched2026-04-22 00:33:32Z · anthropic/claude-opus-4.6 · v2
First seen2026-04-21
Last seen2026-04-22

Agent access

JSONhttps://clawmart.sh/api/listings/s8KW9R
NFT ownership lookup via x402 micropayment on Base for $0.02 per request — Clawmart · Clawmart