x402basequality 0.40

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/1/owner

What it does

This endpoint at lowpaymentfee.com returns NFT ownership information for a given NFT (identified by ID in the URL path). It is part of a broader platform offering pay-per-request APIs across data analytics, AI/ML, finance/Web3, and infrastructure categories — all settled via the x402 protocol on the Base network using USDC.

The specific endpoint `/api/v1/nfts/1/owner` accepts POST requests and charges a maximum of $0.02 per call (20,000 base units of USDC with 6 decimals). Payment is made inline via the X-PAYMENT header using the x402 "exact" scheme — no API keys, no subscriptions, no rate limits. The payment is sent to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` with a 300-second timeout window.

The platform advertises a uniform $0.02/request pricing model across all its endpoints. Documentation beyond the landing page is sparse — the /api, /pricing, and /README routes all resolve to a wallet-connect page with no additional technical detail. The response schema for this NFT owner endpoint is not documented, so the exact shape of the returned JSON is unknown. The endpoint is live and returning a valid x402 challenge.

Capabilities

nft-ownership-lookupx402-micropaymentusdc-paymentbase-networkpay-per-requestno-api-key

Use cases

  • —Querying the current owner of a specific NFT by ID
  • —Building NFT portfolio dashboards that need on-demand ownership checks
  • —Agent workflows that verify NFT ownership before executing downstream logic

Fit

Best for

  • —Agents needing low-friction, keyless NFT ownership queries
  • —Micropayment-based access without subscription overhead
  • —On-chain-settled API calls on Base L2

Not for

  • —Bulk NFT collection enumeration (no batch endpoint documented)
  • —Querying NFT metadata, images, or traits (endpoint is owner-only)
  • —Users who need detailed API documentation or response schema guarantees

Quick start

curl -X POST https://lowpaymentfee.com/api/v1/nfts/1/owner \
  -H "X-PAYMENT: <x402-payment-header>" \
  -H "Content-Type: application/json"

Endpoint

URLhttps://lowpaymentfee.com/api/v1/nfts/1/owner
Transporthttp
Protocolx402
Pay to0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3
CurrencyUSD COIN

Quality

0.40/ 1.00

The endpoint is live and returns a valid x402 402 challenge with clear pricing. However, there is no OpenAPI spec, no response schema, no request body documentation, and the /api, /pricing, and /README pages are all empty wallet-connect stubs. The actual data returned by this endpoint is unknown.

Warnings

  • —No response schema documented — the shape of the returned NFT owner data is unknown.
  • —No request body schema documented — unclear if a POST body is required or what fields it accepts.
  • —Documentation pages (/api, /pricing, /README) are non-functional wallet-connect stubs.
  • —The endpoint path hardcodes NFT ID '1'; it is unclear how to query other NFT IDs without documentation.

Citations

Provenance

Indexed fromx402_bazaar
Enriched2026-04-21 23:19:53Z · anthropic/claude-opus-4.6 · v2
First seen2026-04-21
Last seen2026-04-22

Agent access

JSONhttps://clawmart.sh/api/listings/VmCcn6
Query NFT ownership data via x402 micropayment on Base for $0.02 per request. — Clawmart · Clawmart