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/55/owner

What it does

This endpoint at lowpaymentfee.com returns the owner of NFT #55 via a pay-per-call x402 protocol. The endpoint accepts POST requests and settles payments in USDC on the Base network. The x402 challenge advertises a maxAmountRequired of 20,000 base units of USDC (6 decimals), which equals $0.02 per request. No API keys, rate limits, or subscriptions are required — callers simply attach an X-PAYMENT header with a valid x402 payment proof.

The provider hosts a broader suite of APIs across data & analytics, AI/ML inference, finance/Web3, and infrastructure utilities, all priced uniformly at $0.02 per request. This specific endpoint (`/api/v1/nfts/55/owner`) appears to be an NFT ownership lookup, though the crawled documentation does not provide detailed schema information about the request body or response format beyond the x402 challenge metadata. The response MIME type is application/json.

Because there is no OpenAPI spec, no detailed endpoint documentation, and no example request/response payloads available from the crawl, the exact fields accepted in the POST body and the structure of the returned owner data are unknown. Callers should expect a JSON response containing at minimum an owner address for the specified NFT.

Capabilities

nft-ownership-lookupx402-micropaymentusdc-settlementbase-networkpay-per-callno-api-key

Use cases

  • —Verify current ownership of a specific NFT before initiating a trade or transfer
  • —Build dashboards that display NFT holder information without running your own indexer
  • —Agent-driven workflows that need to confirm NFT ownership as part of automated decision-making

Fit

Best for

  • —Agents needing quick, keyless NFT ownership checks settled in USDC on Base
  • —Developers prototyping NFT-aware applications without managing API credentials
  • —Low-volume or sporadic queries where $0.02 per call is more economical than a subscription

Not for

  • —Bulk or high-throughput NFT indexing across thousands of tokens (no batch endpoint documented)
  • —Querying NFTs beyond token ID 55 on this specific endpoint (path is hardcoded to NFT #55)

Quick start

curl -X POST https://lowpaymentfee.com/api/v1/nfts/55/owner \
  -H "Content-Type: application/json" \
  -H "X-PAYMENT: <x402-payment-proof>"

Endpoint

URLhttps://lowpaymentfee.com/api/v1/nfts/55/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), but there is no OpenAPI spec, no endpoint documentation, no example request/response, and the endpoint path is hardcoded to a single NFT ID. The provider description is generic ('Premium API Access') and the crawl yielded minimal useful detail.

Warnings

  • —No OpenAPI or schema documentation available — request body and response structure are unknown
  • —Endpoint path is hardcoded to NFT #55; unclear if other NFT IDs are supported via different paths
  • —Provider landing page lists many API categories but none link to detailed docs; /api, /pricing, and /README pages only show 'Connect wallet'
  • —The existing title and description ('Premium API Access') are generic and do not describe actual functionality

Citations

Provenance

Indexed fromx402_bazaar
Enriched2026-04-21 23:37:58Z · anthropic/claude-opus-4.6 · v2
First seen2026-04-21
Last seen2026-04-22

Agent access

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