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/13/owner

What it does

This endpoint at lowpaymentfee.com returns NFT ownership information for NFT ID 13. It is part of a broader suite of x402-protocol APIs offered by the same provider, spanning data analytics, AI/ML inference, finance/Web3 data, and infrastructure utilities. All endpoints share the same pricing model: $0.02 per request, settled in USDC on the Base network with no API keys, no rate limits, and no commitments required.

The specific endpoint `/api/v1/nfts/13/owner` accepts POST requests and is gated by the x402 payment protocol. When called without payment, it returns a 402 challenge specifying the USDC asset contract (0x8335…2913 on Base) and a maximum amount of 20,000 base units (i.e., $0.02 given USDC's 6 decimals). Payment is made via the `X-PAYMENT` header using the x402 "exact" scheme. The response MIME type is `application/json`.

The provider's landing page lists many other endpoints across categories like sentiment analysis, text summarization, embeddings, price feeds, gas estimates, geocoding, and more — all at the same $0.02 price point. No OpenAPI schema, detailed documentation, or example responses were found in the crawl, so the exact response shape for this NFT owner endpoint 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 workflows that verify NFT ownership before executing downstream logic

Fit

Best for

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

Not for

  • —Bulk or high-throughput NFT indexing across thousands of tokens (no batch endpoint documented)
  • —Querying NFTs on chains other than Base (only Base network settlement is advertised)
  • —Users who need detailed NFT metadata beyond ownership (only owner data is implied)

Quick start

curl -X POST https://lowpaymentfee.com/api/v1/nfts/13/owner \
  -H "X-PAYMENT: <x402-payment-token>" \
  -H "Content-Type: application/json"

Endpoint

URLhttps://lowpaymentfee.com/api/v1/nfts/13/owner
Transporthttp
Protocolx402
Pay to0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3
CurrencyUSD COIN

Quality

0.35/ 1.00

The endpoint is live and returns a valid x402 402 challenge, confirming pricing and payment details. However, there is no OpenAPI schema, no documented request/response format, no example payloads, and the crawled docs pages returned only 'Connect wallet' with no useful content. The specific NFT endpoint is not even listed on the provider's landing page, making its exact behavior unclear.

Warnings

  • —No OpenAPI or schema documentation available for this endpoint
  • —No example request or response bodies found; response shape is unknown
  • —This specific NFT endpoint (/api/v1/nfts/13/owner) is not listed on the provider's landing page — only analytics, AI, finance, and utility endpoints are shown
  • —The endpoint is hardcoded to NFT ID 13; it is unclear whether other NFT IDs are supported or how to discover them

Citations

Provenance

Indexed fromx402_bazaar
Enriched2026-04-21 23:19:26Z · anthropic/claude-opus-4.6 · v2
First seen2026-04-21
Last seen2026-04-22

Agent access

JSONhttps://clawmart.sh/api/listings/Dk9yeB
Query NFT ownership data via x402 micropayment on Base for $0.02 per request. — Clawmart · Clawmart