x402basequality 0.30

x402-gated product inventory endpoint on Base, pay-per-request with USDC.

Price
0.02 USDC / call
Protocol
x402
Verified
no
Endpoint
https://lowpaymentfee.com/api/v1/products/28/inventory

What it does

This endpoint at lowpaymentfee.com provides access to a product inventory resource (product ID 28) behind an x402 paywall. The endpoint accepts POST requests and returns JSON. Payment is settled on the Base network using USDC (contract 0x8335…2913) via the x402 "exact" scheme. The maximum amount required per call is 20,000 base units of USDC, which equals $0.02 (USDC uses 6 decimals).

The hosting site lowpaymentfee.com advertises a broad catalog of x402-gated APIs spanning data analytics, AI/ML inference, finance/Web3 data, and infrastructure utilities — all priced at $0.02 per request with no API keys, no rate limits, and no commitments. However, the specific endpoint listed here (/api/v1/products/28/inventory) is labeled "Premium API Access" and does not appear in the site's publicly listed API catalog. No documentation, request schema, or response schema is available for this particular endpoint beyond the x402 challenge metadata.

The endpoint is confirmed live: it returns a well-formed x402 version 1 challenge with a 402 status code. The site root returns HTTP 200. No OpenAPI spec, ai-plugin manifest, or robots.txt was found. Documentation, pricing, and README pages all render only a "Connect wallet" prompt with no additional content, so the actual behavior and data returned by this endpoint remain unclear.

Capabilities

x402-paymentusdc-settlementbase-networkproduct-inventorypay-per-requestjson-response

Use cases

  • —Querying product inventory data for product ID 28 via a single paid API call
  • —Integrating pay-per-request inventory lookups into agent workflows without API keys
  • —Demonstrating x402 protocol payment flows on Base with USDC

Fit

Best for

  • —Agents or developers experimenting with x402 payment protocol
  • —Scenarios requiring keyless, pay-per-call API access on Base
  • —Quick one-off inventory lookups without subscription commitments

Not for

  • —High-volume inventory queries where per-call pricing adds up
  • —Use cases requiring detailed API documentation or guaranteed SLAs
  • —Users who need fiat-only payment options

Quick start

curl -X POST https://lowpaymentfee.com/api/v1/products/28/inventory \
  -H "Content-Type: application/json" \
  -H "X-PAYMENT: <x402-payment-token>"

Endpoint

URLhttps://lowpaymentfee.com/api/v1/products/28/inventory
Transporthttp
Protocolx402
Pay to0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3
CurrencyUSD COIN

Quality

0.30/ 1.00

The endpoint is live and returns a valid x402 challenge, but there is no documentation, no request/response schema, and no description of what data is actually returned. The endpoint path does not appear in the site's public catalog, and all doc pages render only a wallet-connect prompt. Effectively a stub listing.

Warnings

  • —No API documentation available — all doc pages render only 'Connect wallet'
  • —No OpenAPI spec or request/response schema found
  • —This specific endpoint (/api/v1/products/28/inventory) is not listed in the site's public API catalog
  • —Actual response payload and behavior are unknown

Citations

Provenance

Indexed fromx402_bazaar
Enriched2026-04-18 22:20:13Z · anthropic/claude-opus-4.6 · v2
First seen2026-04-18
Last seen2026-04-22

Agent access

JSONhttps://clawmart.sh/api/listings/qZpqsQ
x402-gated product inventory endpoint on Base, pay-per-request with USDC. — Clawmart · Clawmart