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/63/owner

What it does

This endpoint at lowpaymentfee.com returns NFT ownership information for NFT #63. 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/63/owner` accepts POST requests and returns JSON. Payment is handled inline via the X-PAYMENT header using the x402 exact payment scheme. The maximum amount required is 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 USD (USDC uses 6 decimals). No API keys, rate limits, or upfront commitments are required — each call is independently paid.

The platform advertises a uniform $0.02 per request pricing across all its endpoints. The x402 challenge is live and well-formed, with a 300-second payment timeout. The payTo address is 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3. Note that no OpenAPI schema, detailed documentation, or example responses were found in the crawl, so the exact response format for this NFT owner lookup is unknown.

Capabilities

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

Use cases

  • —Querying the current owner of a specific NFT programmatically
  • —Building NFT portfolio dashboards that need on-demand ownership checks
  • —Agent-driven workflows that verify NFT ownership before executing actions
  • —Integrating NFT ownership verification into marketplace or gallery applications

Fit

Best for

  • —Developers needing simple pay-per-call NFT ownership data without API key management
  • —AI agents that can settle x402 payments on Base
  • —Low-volume or sporadic NFT ownership queries where subscription pricing is wasteful

Not for

  • —Bulk or high-frequency NFT indexing (no batch endpoint documented)
  • —Users who cannot settle USDC payments on the Base network
  • —Querying NFTs beyond ID 63 (only this specific endpoint was probed; generalization is unconfirmed)

Quick start

curl -X POST https://lowpaymentfee.com/api/v1/nfts/63/owner \
  -H "X-PAYMENT: <x402-payment-token>" \
  -H "Content-Type: application/json"

Endpoint

URLhttps://lowpaymentfee.com/api/v1/nfts/63/owner
Transporthttp
Protocolx402
Pay to0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3
CurrencyUSD COIN

Quality

0.40/ 1.00

The x402 challenge is live and well-formed with clear pricing, but there is no OpenAPI schema, no documented request/response format, and no example payloads. The endpoint's exact behavior (what fields are returned, whether other NFT IDs are supported) must be inferred.

Warnings

  • —No OpenAPI or JSON schema available for request or response bodies
  • —No documentation beyond the landing page listing; /api, /pricing, and /README all just show 'Connect wallet'
  • —It is unclear whether the /nfts/{id}/owner pattern generalizes to other NFT IDs or is limited to ID 63
  • —No example responses available — response format is unknown

Citations

Provenance

Indexed fromx402_bazaar
Enriched2026-04-22 00:39:34Z · anthropic/claude-opus-4.6 · v2
First seen2026-04-21
Last seen2026-04-22

Agent access

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