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 2) behind an x402 paywall. It is part of a broader platform offering dozens of pay-per-call APIs spanning data analytics, AI/ML inference, finance, crypto, and utility services — all settled on the Base network using USDC.
The specific endpoint `/api/v1/products/2/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 no API keys, no rate limits, and instant access — payment is handled entirely via the x402 protocol's X-PAYMENT header.
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. The endpoint is confirmed live (returns 402 with a valid x402 challenge), but without documentation it is unclear what request body is expected or what shape the response takes.
Capabilities
Use cases
- —Querying product inventory data with per-request USDC micropayments
- —Integrating inventory checks into agent workflows without API key management
- —Programmatic access to product stock or catalog information
Fit
Best for
- —Agents or bots that need keyless, pay-per-call inventory data
- —Developers experimenting with x402 protocol payments on Base
- —Low-volume, on-demand inventory lookups without subscription commitments
Not for
- —High-volume inventory polling where per-request fees add up quickly
- —Use cases requiring detailed API documentation or guaranteed SLAs
- —Users without access to USDC on the Base network
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/products/2/inventory \
-H "X-PAYMENT: <x402-payment-token>" \
-H "Content-Type: application/json"Endpoint
Quality
The endpoint is confirmed live with a valid x402 challenge and clear pricing ($0.02/request in USDC on Base). However, there is no documentation, no OpenAPI schema, no request/response examples, and the docs pages are empty. The purpose of this specific endpoint ('Premium API Access' for product 2 inventory) is vague and undocumented.
Warnings
- —No documentation available — docs, API, pricing, and README pages all show only 'Connect wallet' with no content.
- —No OpenAPI or request/response schema provided; request body format and response shape are unknown.
- —The endpoint name 'Premium API Access' is generic and does not describe what data is returned.
- —The broader platform lists many endpoints but none appear to have public documentation.
Citations
- —The endpoint returns a 402 x402 challenge with maxAmountRequired of 20000 base units of USDC on Basehttps://lowpaymentfee.com/api/v1/products/2/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 is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Basehttps://lowpaymentfee.com/api/v1/products/2/inventory