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/89/owner

What it does

This endpoint at lowpaymentfee.com returns the owner of NFT #89 via a pay-per-call x402 protocol. The endpoint accepts POST requests and is settled 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 broader lowpaymentfee.com platform offers a wide catalog of x402-gated endpoints spanning data analytics, AI/ML inference (sentiment analysis, summarization, classification, embeddings), finance/Web3 data (price feeds, exchange rates, token quotes, gas estimates), and infrastructure utilities (geocoding, validation, conversion, generation). All endpoints are uniformly priced at $0.02 per request and settle on Base via USDC.

This specific endpoint (/api/v1/nfts/89/owner) appears to be an NFT ownership lookup. The response format is application/json. No OpenAPI schema or detailed documentation for request/response bodies was found beyond the x402 challenge metadata, so the exact fields returned are not confirmed. The endpoint is live and responding with a proper 402 challenge.

Capabilities

nft-ownership-lookupx402-micropaymentusdc-settlementbase-networkpay-per-callno-api-keyjson-response

Use cases

  • —Querying the current owner of a specific NFT programmatically
  • —Building dashboards that display NFT ownership information
  • —Verifying NFT ownership before granting access or privileges
  • —Integrating NFT holder data into agent workflows without managing API keys

Fit

Best for

  • —Agents or apps needing quick, keyless NFT ownership checks
  • —Developers who prefer pay-per-call over subscription billing
  • —Web3 projects settling API costs on-chain via USDC on Base

Not for

  • —Bulk enumeration of all NFT owners across a collection (single-NFT endpoint)
  • —Users who need free or ad-supported NFT data
  • —Applications requiring detailed NFT metadata beyond ownership

Quick start

curl -X POST https://lowpaymentfee.com/api/v1/nfts/89/owner \
  -H "X-PAYMENT: <x402-payment-proof>" \
  -H "Content-Type: application/json"

Endpoint

URLhttps://lowpaymentfee.com/api/v1/nfts/89/owner
Transporthttp
Protocolx402
Pay to0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3
CurrencyUSD COIN

Quality

0.40/ 1.00

The endpoint is live and returns a valid x402 402 challenge with clear pricing and network info. However, there is no OpenAPI schema, no documented request/response body structure, and the crawled pages beyond the homepage were empty. The specific NFT endpoint is not listed on the homepage catalog, making its exact behavior inferrable but unconfirmed.

Warnings

  • —No OpenAPI or detailed API documentation available for this endpoint.
  • —The /api/v1/nfts/89/owner path is not listed among the advertised endpoints on the homepage — it may be undocumented or experimental.
  • —Request and response body schemas are unknown; example_request_json and example_response_json are null.
  • —Only NFT #89 is referenced; it is unclear whether other NFT IDs are supported at similar paths.

Citations

Provenance

Indexed fromx402_bazaar
Enriched2026-04-22 00:32:36Z · anthropic/claude-opus-4.6 · v2
First seen2026-04-21
Last seen2026-04-22

Agent access

JSONhttps://clawmart.sh/api/listings/cuYcJ9
Query NFT ownership data via x402 micropayment on Base for $0.02 per request. — Clawmart · Clawmart