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 97) via the x402 payment protocol. It is part of a broader platform that offers dozens of pay-per-call APIs spanning data analytics, AI/ML inference, finance, crypto, and utility services — all gated behind x402 challenges on the Base network.
The specific endpoint `/api/v1/products/97/inventory` is listed as "Premium API Access" and accepts POST requests. Payment is settled in USDC on Base (contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) with a maximum cost of 0.02 USDC per request (20,000 base units at 6 decimals). The x402 challenge was successfully captured, confirming the endpoint is live. There are no API keys or rate limits advertised; access is granted purely through per-request micropayments.
Documentation is extremely sparse. The crawled docs, API, pricing, and README pages all returned 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's purpose — whether it returns stock levels, product details, or something else — must be inferred from the URL path alone. Prospective users should expect to experiment or contact the provider for integration details.
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-level data on a crypto-native payment rail
Fit
Best for
- —Agents or bots that need keyless, pay-as-you-go API access
- —Developers building on Base who want USDC-settled data endpoints
- —Prototyping inventory integrations without subscription commitments
Not for
- —Users needing detailed API documentation or guaranteed SLAs before integrating
- —High-volume inventory queries where per-request pricing may add up versus bulk plans
- —Anyone without a Base-compatible USDC wallet
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/products/97/inventory \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-token>" \
-d '{}'Endpoint
Quality
The x402 challenge is live and pricing is clear ($0.02 USDC per request on Base). However, there is no OpenAPI schema, no request/response examples, and no meaningful documentation — the docs pages all render only a wallet-connect prompt. The actual data returned by this endpoint is unknown.
Warnings
- —No documentation available — all doc pages return only a 'Connect wallet' prompt
- —No request body schema or response schema provided; endpoint behavior must be discovered experimentally
- —The endpoint path suggests product inventory but the exact data model is unspecified
- —Listed as 'Premium API Access' which is a generic label, not a descriptive name
Citations
- —The endpoint returns a 402 x402 challenge with maxAmountRequired of 20000 base units in USDC on Basehttps://lowpaymentfee.com/api/v1/products/97/inventory
- —Platform advertises $0.02 per request, no API keys, no rate limits, instant access on Base networkhttps://lowpaymentfee.com
- —USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913https://lowpaymentfee.com/api/v1/products/97/inventory
- —Docs, API, pricing, and README pages all returned only a 'Connect wallet' prompthttps://lowpaymentfee.com/docs