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/10/owner

What it does

This endpoint at lowpaymentfee.com returns NFT owner information for a given NFT (token ID 10 in the probed URL path). It is part of a broader suite of pay-per-call APIs offered by lowpaymentfee.com, all settled via the x402 protocol using USDC on the Base network. The endpoint accepts POST requests and returns JSON.

Pricing is $0.02 per request (the x402 challenge advertises a maxAmountRequired of 20,000 base units of USDC, which has 6 decimals, equaling $0.02). No API keys, rate limits, or subscriptions are required — callers simply attach an X-PAYMENT header with a valid x402 payment proof. The payment is sent to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 on Base mainnet, using the USDC contract at 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913.

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, the specific response schema for this NFT owner endpoint is not documented, and no example responses or detailed field descriptions are available. The endpoint is live and returning a proper 402 challenge.

Capabilities

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

Use cases

  • —Querying the current owner of a specific NFT by token ID
  • —Building NFT portfolio dashboards that need on-demand ownership checks
  • —Verifying NFT ownership as part of token-gated access flows
  • —Automated agents that need to resolve NFT holders without managing API keys

Fit

Best for

  • —Developers needing simple, keyless NFT ownership queries
  • —AI agents that can settle x402 payments autonomously on Base
  • —Low-volume or sporadic NFT data lookups where per-call pricing is preferable to subscriptions

Not for

  • —High-throughput bulk NFT indexing (no batch endpoint documented)
  • —Users who cannot settle USDC payments on the Base network
  • —Querying detailed NFT metadata beyond ownership

Quick start

curl -X POST https://lowpaymentfee.com/api/v1/nfts/10/owner \
  -H "X-PAYMENT: <x402-payment-proof>" \
  -H "Content-Type: application/json"

Endpoint

URLhttps://lowpaymentfee.com/api/v1/nfts/10/owner
Transporthttp
Protocolx402
Pay to0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3
CurrencyUSD COIN

Quality

0.35/ 1.00

The endpoint is live and returns a valid x402 402 challenge with clear pricing and network details. However, there is no documented request body schema, no response schema, no example responses, and no detailed documentation for this specific NFT endpoint. The listing is essentially a stub with only the payment challenge to go on.

Warnings

  • —No OpenAPI spec or detailed documentation available for this endpoint
  • —Response schema is completely unknown — no example responses provided
  • —The specific NFT endpoint (/api/v1/nfts/10/owner) is not listed on the provider's landing page among the advertised APIs, raising questions about its completeness or experimental status
  • —No robots.txt or agents.txt found

Citations

Provenance

Indexed fromx402_bazaar
Enriched2026-04-21 23:19:30Z · anthropic/claude-opus-4.6 · v2
First seen2026-04-21
Last seen2026-04-22

Agent access

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