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/2/owner

What it does

This endpoint at lowpaymentfee.com returns NFT ownership information for a specific NFT (ID 2) via a POST request. It is part of a broader suite of x402-enabled APIs offered by the same provider, spanning data analytics, AI/ML inference, finance/Web3, and infrastructure utilities. All endpoints on the platform share a uniform $0.02-per-request pricing model settled in USDC on the Base network.

The endpoint uses the x402 payment protocol (version 1) with the "exact" scheme. The payment challenge requires a maximum of 20,000 base units of USDC (contract 0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. Payments are sent to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a 300-second timeout. No API keys or rate limits are advertised; access is gated purely by the x402 payment header.

The specific functionality of this endpoint — returning the owner of NFT #2 — is narrow. The provider's landing page lists many other endpoints but does not provide detailed documentation, request/response schemas, or example payloads for any of them. The response MIME type is application/json, but the exact response shape is not documented. Because of the lack of documentation and the very specific resource path (hardcoded NFT ID 2), the practical utility for general NFT ownership queries is unclear without further information about whether the ID is parameterized or fixed.

Capabilities

x402-paymentnft-ownership-queryusdc-base-settlementmicropayment-apino-api-keypay-per-request

Use cases

  • —Querying the current owner of a specific NFT on-chain
  • —Integrating NFT ownership checks into agent workflows without API key management
  • —Demonstrating x402 micropayment protocol usage on Base

Fit

Best for

  • —Agents needing quick NFT ownership lookups with no signup
  • —Developers experimenting with x402 payment protocol
  • —Low-volume, pay-as-you-go NFT data retrieval

Not for

  • —Bulk or batch NFT ownership queries across many token IDs
  • —Applications requiring detailed NFT metadata beyond ownership
  • —Users who need free or subscription-based API access

Quick start

curl -X POST https://lowpaymentfee.com/api/v1/nfts/2/owner \
  -H "X-PAYMENT: <x402_payment_token>" \
  -H "Content-Type: application/json"

Endpoint

URLhttps://lowpaymentfee.com/api/v1/nfts/2/owner
Transporthttp
Protocolx402
Pay to0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3
CurrencyUSD COIN

Quality

0.35/ 1.00

The endpoint is live (402 challenge captured) and pricing is clear ($0.02 USDC on Base). However, there is no OpenAPI schema, no documented request/response format, no examples, and the endpoint path appears hardcoded to a single NFT ID. The crawled pages beyond the landing page returned only 'Connect wallet' with no useful documentation.

Warnings

  • —No request or response schema documented — actual payload structure is unknown
  • —Endpoint path is hardcoded to NFT ID 2; unclear if other NFT IDs are supported via different paths
  • —No API documentation, README, or OpenAPI spec available from the provider
  • —Landing page lists many endpoint categories but none have detailed docs

Citations

Provenance

Indexed fromx402_bazaar
Enriched2026-04-22 00:46:15Z · anthropic/claude-opus-4.6 · v2
First seen2026-04-21
Last seen2026-04-22

Agent access

JSONhttps://clawmart.sh/api/listings/sjYqH6
Query NFT ownership data via x402 micropayment on Base for $0.02 per request. — Clawmart · Clawmart