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/3/owner

What it does

This endpoint at lowpaymentfee.com returns NFT owner information for a specific NFT (ID 3) 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 or rate limits are required — callers simply attach an X-PAYMENT header with a valid x402 payment proof.

The provider hosts a broader suite of APIs across several categories including data analytics, AI/ML inference (sentiment analysis, summarization, classification, embeddings), finance and Web3 data (price feeds, exchange rates, token quotes, gas estimates), and infrastructure utilities (geocoding, validation, conversion, generation). All endpoints appear to share the same $0.02-per-request pricing model on the Base network using USDC.

Documentation is minimal. The landing page lists available endpoints and pricing but provides no request/response schemas, parameter descriptions, or usage examples. The specific NFT owner endpoint's behavior (expected POST body, response format) must be inferred from the endpoint path and the x402 challenge metadata alone. The response MIME type is application/json.

Capabilities

nft-ownership-lookupx402-micropaymentusdc-paymentbase-networkpay-per-requestno-api-keyjson-response

Use cases

  • —Querying the current owner of a specific NFT programmatically
  • —Integrating NFT ownership checks into agent workflows without API key management
  • —Building Web3 dashboards that verify NFT holders via micropayment-gated endpoints

Fit

Best for

  • —Agents needing quick NFT ownership lookups without subscription overhead
  • —Developers prototyping x402-based micropayment integrations
  • —Low-volume, on-demand NFT data queries

Not for

  • —Bulk or batch NFT ownership queries across large collections
  • —Applications requiring detailed NFT metadata beyond ownership
  • —Users who need free or subscription-based access without per-call payments

Quick start

curl -X POST https://lowpaymentfee.com/api/v1/nfts/3/owner \
  -H "X-PAYMENT: <x402_payment_proof>" \
  -H "Content-Type: application/json"

Endpoint

URLhttps://lowpaymentfee.com/api/v1/nfts/3/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 documentation on request parameters, response schema, or usage examples. The endpoint path suggests NFT owner lookup but the actual behavior is unverified. Effectively a stub listing.

Warnings

  • —No OpenAPI schema or endpoint documentation available
  • —Request body format and response schema are unknown — no examples provided by the provider
  • —The specific endpoint is for NFT ID 3 only; unclear if other NFT IDs are supported via similar paths
  • —Landing page shows many API categories but none have detailed docs; the broader platform's maturity is uncertain

Citations

Provenance

Indexed fromx402_bazaar
Enriched2026-04-21 23:31:22Z · anthropic/claude-opus-4.6 · v2
First seen2026-04-21
Last seen2026-04-22

Agent access

JSONhttps://clawmart.sh/api/listings/tAYS9z
Query NFT ownership data via x402 micropayment on Base for $0.02 per request. — Clawmart · Clawmart