x402-gated product inventory endpoint on Base, pay-per-call with USDC.
What it does
This endpoint at lowpaymentfee.com provides access to a product inventory resource (product ID 38) via the x402 payment protocol. It is part of a broader platform that offers dozens of pay-per-request API endpoints spanning data analytics, AI/ML inference, finance, crypto, and utility services — all gated behind x402 micro-payments on the Base network using USDC.
The specific endpoint `/api/v1/products/38/inventory` is listed as "Premium API Access" and accepts 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 flat $0.02/request pricing across all endpoints, with no API keys, no rate limits, and no minimum commitments required.
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 challenge), but without documentation it is difficult to know what data is returned or what input is required.
Capabilities
Use cases
- —Querying product inventory data for product ID 38 via a single micro-payment
- —Integrating pay-per-request inventory lookups into agent workflows without API key management
- —Programmatic inventory checks settled on Base L2 with USDC
Fit
Best for
- —Agents or applications needing on-demand inventory data without subscription commitments
- —Developers experimenting with x402 payment-gated APIs on Base
- —Low-volume, pay-as-you-go inventory queries
Not for
- —Users who need detailed API documentation or request/response schemas before integrating
- —High-volume inventory monitoring where per-request fees add up
- —Anyone without a Base-compatible USDC wallet
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/products/38/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 clear pricing ($0.02/request in USDC on Base). However, there is no OpenAPI schema, no documentation, no request/response examples, and no description of what the inventory data actually contains. The docs pages are empty beyond a wallet-connect prompt. This is effectively a stub listing.
Warnings
- —No API documentation available — docs, pricing, and README pages all show only 'Connect wallet' with no content
- —No OpenAPI or request/response schema provided; input format and output structure are unknown
- —The endpoint is labeled 'Premium API Access' with no further description of what inventory data is returned
- —Product ID 38 is hardcoded in the path with no context about what product it refers to
Citations
- —The endpoint returns a valid x402 challenge with maxAmountRequired of 20000 base units of USDC on Basehttps://lowpaymentfee.com/api/v1/products/38/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/38/inventory