x402-gated product inventory endpoint on Base, pay $0.02 per request in USDC.
What it does
This endpoint at lowpaymentfee.com provides access to a product inventory resource (product ID 71) via the x402 payment protocol. It is part of a broader platform that offers dozens of pay-per-call API endpoints spanning data analytics, AI/ML inference, finance/Web3 data, and infrastructure utilities — all gated behind x402 micropayments on the Base network.
The specific endpoint `/api/v1/products/71/inventory` is listed as "Premium API Access" and accepts POST requests. Payment is settled in USDC (contract 0x8335…2913 on Base) with a maximum amount of 20,000 base units, which equals $0.02 (USDC uses 6 decimals). The platform advertises no API keys, no rate limits, and instant access — you simply attach an X-PAYMENT header with a valid x402 payment proof to each request.
Documentation 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 schema, no request/response examples, and no description of what the inventory endpoint actually returns. The endpoint is confirmed live (returns a proper 402 challenge), but without documentation it is unclear what input the POST body should contain or what shape the response takes. The platform hosts many other endpoints at similar price points, but this specific listing covers only the product inventory resource.
Capabilities
Use cases
- —Querying product inventory data for product ID 71 via a single micropayment
- —Integrating pay-per-request inventory checks into an automated agent workflow
- —Demonstrating x402 protocol micropayments on Base for commerce data
Fit
Best for
- —Agents or bots that need on-demand inventory lookups without subscription commitments
- —Developers experimenting with x402 micropayment-gated APIs on Base
- —Low-volume callers who prefer per-request pricing over monthly plans
Not for
- —Users who need detailed API documentation or request/response schemas before integrating
- —High-volume inventory polling where per-request costs would accumulate quickly
- —Anyone needing non-USDC or non-Base payment options
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/products/71/inventory \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-proof>"Endpoint
Quality
The endpoint is confirmed live with a valid x402 402 challenge, but there is zero documentation on request format, response schema, or what 'Premium API Access' for product 71 inventory actually returns. No OpenAPI spec, no examples, and all doc pages are empty wallet-connect stubs.
Warnings
- —No documentation available — docs, pricing, API, and README pages all show only 'Connect wallet' with no content
- —No request body schema or response schema provided; unclear what POST body is expected
- —The endpoint name 'Premium API Access' is generic and does not describe the actual data returned
- —Cannot verify what data the inventory endpoint serves without making an authenticated request
Citations
- —Endpoint returns a valid x402 challenge with status 402 and maxAmountRequired of 20000 base units in USDC on Basehttps://lowpaymentfee.com/api/v1/products/71/inventory
- —Platform advertises $0.02 per request, no API keys, no rate limits, instant access, Base networkhttps://lowpaymentfee.com
- —USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913https://lowpaymentfee.com/api/v1/products/71/inventory