x402basequality 0.30

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/51/owner

What it does

This endpoint at lowpaymentfee.com returns the owner of NFT #51 via a pay-per-call x402 protocol. The endpoint accepts POST requests and is settled on the Base network using USDC (contract 0x8335…2913). Each call costs a maximum of 0.02 USDC (20,000 base units with 6 decimals). No API keys, rate limits, or subscriptions are required — callers simply attach an X-PAYMENT header with a valid x402 payment proof.

The provider's site advertises a broad catalog of endpoints spanning data analytics, AI/ML inference, finance/Web3, and infrastructure utilities, all priced at $0.02 per request on the Base network. This specific endpoint (/api/v1/nfts/51/owner) appears to be an NFT-related query returning ownership information in JSON format. The response schema is not documented, so the exact shape of the returned data must be inferred from usage.

Because the provider offers no OpenAPI spec, no detailed documentation, and no example responses, the actual behavior and data quality of this endpoint remain unverified beyond the live 402 challenge. The site's /api, /pricing, and /README pages all resolve to a minimal "Connect wallet" prompt with no additional content.

Capabilities

nft-ownership-queryx402-micropaymentbase-networkusdc-settlementpay-per-callno-api-key

Use cases

  • —Look up the current owner of a specific NFT programmatically
  • —Integrate NFT ownership verification into an agent workflow
  • —Verify NFT holder status before granting access or rewards

Fit

Best for

  • —Agents needing on-demand NFT ownership data without API key management
  • —Micropayment-based access to NFT queries on Base
  • —Quick one-off ownership checks with no subscription commitment

Not for

  • —Bulk or batch NFT ownership queries across large collections (no documented batch support)
  • —Use cases requiring detailed NFT metadata beyond ownership
  • —Users who need free or pre-authenticated API access

Quick start

curl -X POST https://lowpaymentfee.com/api/v1/nfts/51/owner \
  -H "Content-Type: application/json" \
  -H "X-PAYMENT: <x402_payment_proof>"

Endpoint

URLhttps://lowpaymentfee.com/api/v1/nfts/51/owner
Transporthttp
Protocolx402
Pay to0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3
CurrencyUSD COIN

Quality

0.30/ 1.00

The endpoint is live and returns a valid x402 402 challenge, confirming it is operational. However, there is no OpenAPI spec, no documented request/response schema, no example responses, and the site's documentation pages are empty. The endpoint's actual data source and reliability are unknown.

Warnings

  • —No OpenAPI or schema documentation available — response format is unknown
  • —Provider documentation pages (/api, /pricing, /README) return only a 'Connect wallet' prompt with no content
  • —The specific NFT collection and chain source for NFT #51 are not documented
  • —Cannot verify data accuracy or freshness of ownership information

Citations

Provenance

Indexed fromx402_bazaar
Enriched2026-04-21 23:39:12Z · anthropic/claude-opus-4.6 · v2
First seen2026-04-21
Last seen2026-04-22

Agent access

JSONhttps://clawmart.sh/api/listings/qn6bx8
Query NFT ownership data via x402 micropayment on Base for $0.02 per request. — Clawmart · Clawmart