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 45) via the x402 payment protocol. It is part of a broader platform offering dozens of pay-per-call API endpoints spanning data analytics, AI/ML inference, finance, crypto, and utility services — all priced at $0.02 per request settled in USDC on the Base network.
The specific endpoint `/api/v1/products/45/inventory` accepts POST requests and returns JSON. Payment is handled inline via the x402 protocol: callers attach an `X-PAYMENT` header containing a signed USDC payment of up to 20,000 base units (i.e., $0.02, since USDC uses 6 decimals). The payment is sent to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` on Base mainnet, with a maximum timeout of 300 seconds. No API keys or accounts are required — access is entirely payment-gated.
Documentation beyond the landing page is extremely sparse. The docs, API, pricing, and README pages all render only a "Connect wallet" prompt with no additional technical detail. There is no OpenAPI spec, no request/response schema documentation, and no example payloads available. The endpoint title "Premium API Access" and the resource path suggest it returns inventory data for a specific product, but the exact request body format and response structure are unknown.
Capabilities
Use cases
- —Querying real-time inventory levels for a specific product via a single paid API call
- —Integrating product inventory checks into an automated agent workflow without needing API keys
- —Demonstrating x402 payment protocol integration for commerce data endpoints
Fit
Best for
- —Agents or services that need on-demand product inventory data without subscription commitments
- —Developers experimenting with x402 payment-gated API patterns on Base
- —Low-volume inventory lookups where $0.02 per call is cost-effective
Not for
- —High-volume inventory polling where per-request costs would accumulate quickly
- —Use cases requiring detailed API documentation or guaranteed SLAs
- —Users who cannot transact in USDC on the Base network
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/products/45/inventory \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <signed-x402-payment-header>"Endpoint
Quality
The endpoint is live and returns a valid x402 402 challenge, confirming it is operational. However, there is no OpenAPI spec, no request/response schema, no examples, and all documentation pages render only 'Connect wallet' with no content. The endpoint's actual functionality (what inventory data it returns, what POST body it expects) is entirely unknown beyond the URL path and title.
Warnings
- —No documentation available — all doc pages render only 'Connect wallet' with no technical content
- —No OpenAPI or schema definition for request or response payloads
- —The specific purpose of 'products/45/inventory' is unclear — product ID 45 is opaque
- —The broader platform lists many endpoints but none have documented schemas
Citations
- —The endpoint returns a 402 challenge requesting up to 20,000 base units of USDC on Base networkhttps://lowpaymentfee.com/api/v1/products/45/inventory
- —All endpoints on the platform are priced at $0.02 per request with no API keys, no rate limits, and instant access on Base networkhttps://lowpaymentfee.com
- —USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913https://lowpaymentfee.com/api/v1/products/45/inventory