x402-gated product inventory endpoint on Base, pay-per-call with USDC.
What it does
This endpoint at lowpaymentfee.com provides access to a "Premium API Access" resource at the path `/api/v1/products/8/inventory`. It is part of a broader platform (lowpaymentfee.com) that offers a variety of pay-per-request APIs spanning data & analytics, AI & machine learning, finance & Web3, and infrastructure utilities — all gated via the x402 payment protocol on the Base network.
The specific endpoint returns product inventory data (product ID 8) in JSON format. Payment is settled in USDC on Base (contract `0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913`) using the x402 "exact" scheme. The maximum amount required per call is 20,000 base units of USDC (6 decimals), which equals $0.02 USD. The endpoint accepts HTTP POST requests and responds with `application/json`. No API keys or rate limits are advertised; access is granted purely through the x402 payment header.
Documentation on the site is extremely sparse — the docs, pricing, API, and README pages all render only a "Connect wallet" prompt with no further content. There is no OpenAPI spec, no request/response schema documentation, and no usage examples available. The endpoint is confirmed live (returns a proper 402 challenge), but the actual shape of the inventory response and any required POST body fields are unknown.
Capabilities
Use cases
- —Querying real-time inventory levels for a specific product
- —Automated stock-checking by purchasing agents
- —Integrating inventory data into e-commerce or supply-chain workflows
Fit
Best for
- —Agents needing on-demand inventory data without API key registration
- —Micropayment-based access to product stock information
- —x402-compatible clients on the Base network
Not for
- —Bulk inventory queries across many products (only product 8 is documented at this path)
- —Users who need detailed API documentation or request/response schemas before integrating
- —Non-crypto users who cannot settle payments in USDC on Base
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/products/8/inventory \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-token>"Endpoint
Quality
The endpoint is confirmed live with a valid x402 402 challenge, and pricing is clear ($0.02 USDC per call). However, there is no documentation of request parameters, response schema, or usage examples. The docs/pricing/API pages are empty beyond a wallet-connect prompt. The purpose ('Premium API Access' for product 8 inventory) is vague and unverifiable.
Warnings
- —No OpenAPI spec or request/response schema available
- —All documentation pages (docs, pricing, API, README) render only 'Connect wallet' with no content
- —The actual response payload structure is completely unknown
- —The endpoint name 'Premium API Access' is generic and does not describe the data returned
- —Cannot verify what 'products/8/inventory' actually returns without making a paid request
Citations
- —The endpoint returns a 402 challenge with x402Version 1, scheme 'exact', network 'base', maxAmountRequired 20000 USDC base unitshttps://lowpaymentfee.com/api/v1/products/8/inventory
- —USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913https://lowpaymentfee.com/api/v1/products/8/inventory
- —Platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access on Base networkhttps://lowpaymentfee.com
- —Documentation pages render only 'Connect wallet' with no additional contenthttps://lowpaymentfee.com/docs