x402-gated product inventory endpoint on Base, pay-per-request with USDC.
What it does
This endpoint at lowpaymentfee.com provides access to a product inventory resource (product ID 93) 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, crypto, and utility services — all gated behind x402 micropayments on the Base network using USDC.
The specific endpoint `/api/v1/products/93/inventory` is listed as "Premium API Access" and accepts POST requests. Payment is settled on-chain on Base using USDC (contract 0x8335…2913) with a maximum amount of 20,000 base units, which equals $0.02 per request (USDC uses 6 decimals). The platform advertises no API keys, no rate limits, and instant access — you simply attach an x402 payment header to each call.
Documentation is extremely sparse. The docs, pricing, API, 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 endpoint actually returns. The endpoint is confirmed live (returns a proper 402 challenge), but without documentation it is unclear what request body is expected or what shape the response takes. The platform appears to be a demonstration or early-stage deployment of x402 micropayment-gated APIs.
Capabilities
Use cases
- —Querying product inventory data for product ID 93 via a single paid API call
- —Demonstrating x402 micropayment protocol integration for agent-to-API commerce
- —Building automated purchasing or inventory-checking workflows that settle in USDC on Base
Fit
Best for
- —Developers experimenting with x402 payment protocol
- —Agents that need to make on-chain micropayments for API access
- —Projects already operating on the Base L2 network with USDC
Not for
- —Production inventory management requiring documented, stable schemas
- —Users who need free or API-key-based authentication instead of crypto payments
- —Anyone needing detailed documentation or SLA guarantees
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/products/93/inventory \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-token>"Endpoint
Quality
The endpoint is live and returns a valid x402 402 challenge, confirming it works. However, there is no OpenAPI schema, no request/response examples, and all documentation pages render only 'Connect wallet' with no content. The purpose of the 'Premium API Access' / product inventory endpoint is unclear beyond its URL path. Effectively a stub listing.
Warnings
- —No documentation available — all doc pages render only 'Connect wallet'
- —No OpenAPI or request/response schema provided
- —Purpose and data returned by /api/v1/products/93/inventory is unknown
- —Platform may be a demo or early-stage deployment; no SLA or support information found
- —The endpoint path suggests a specific product (ID 93) but no catalog or product context is available
Citations
- —The endpoint returns a valid x402 402 challenge with maxAmountRequired of 20000 base units of USDC on Basehttps://lowpaymentfee.com/api/v1/products/93/inventory
- —The 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/93/inventory
- —Documentation pages (docs, pricing, API, README) all render only 'Connect wallet'https://lowpaymentfee.com/docs