x402-gated product inventory endpoint on Base, paid per-request in USDC.
What it does
This endpoint at lowpaymentfee.com provides access to a product inventory resource (product ID 22) behind an x402 paywall. It is part of a broader platform that offers dozens of pay-per-call API endpoints spanning data analytics, AI/ML inference, finance, crypto, infrastructure utilities, and more — all settled on the Base network using USDC.
The specific endpoint `/api/v1/products/22/inventory` is listed as "Premium API Access" and accepts HTTP POST requests. The x402 challenge indicates a maximum cost of 20,000 base units of USDC (0x8335… on Base), which equals $0.02 per request (USDC uses 6 decimals). The platform advertises uniform $0.02/request pricing across all endpoints, with no API keys, no rate limits, no minimums, and instant access.
Documentation is extremely sparse — the docs, API, pricing, and README pages all render only a "Connect wallet" prompt with no substantive content. There is no OpenAPI schema, no request/response examples, and no description of what the inventory data actually contains or what fields the POST body expects. The endpoint is confirmed live (returns a proper 402 x402 challenge), but without documentation it is difficult to know what data is returned or what input is required beyond a POST request.
Capabilities
Use cases
- —Querying product inventory data for product ID 22 via a single paid API call
- —Integrating pay-per-request inventory checks into automated agent workflows
- —Accessing inventory information without managing API keys or subscriptions
Fit
Best for
- —Agents that need on-demand inventory data with no subscription overhead
- —Developers experimenting with x402 payment-gated APIs on Base
- —Workflows requiring low-cost, keyless API access settled in USDC
Not for
- —Users who need detailed API documentation or response schemas before integrating
- —High-volume inventory polling where per-request costs would accumulate
- —Anyone without a Base-compatible USDC wallet
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/products/22/inventory \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-header>"Endpoint
Quality
The endpoint is live and returns a valid x402 challenge with clear pricing, but there is no documentation, no OpenAPI schema, no request/response examples, and no description of what data the inventory endpoint actually returns. The listing is effectively a stub with confirmed liveness.
Warnings
- —No documentation available — docs, API, pricing, and README pages all show only 'Connect wallet' with no content
- —No OpenAPI or schema describing request body or response format for this endpoint
- —The purpose and data returned by '/api/v1/products/22/inventory' is unclear — 'Premium API Access' is a generic label
- —Cannot verify what inventory data is actually served without making a paid request
Citations
- —The endpoint returns a 402 x402 challenge with maxAmountRequired of 20000 base units of USDC on Basehttps://lowpaymentfee.com/api/v1/products/22/inventory
- —The platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access on Base networkhttps://lowpaymentfee.com
- —USDC asset address on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913https://lowpaymentfee.com/api/v1/products/22/inventory