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 68) behind an x402 paywall. The endpoint accepts POST requests and returns JSON. Payment is settled on the Base network using USDC (contract 0x8335…2913) via the x402 "exact" scheme. The maximum amount required per call is 20,000 base units of USDC, which equals $0.02 (USDC uses 6 decimals).
The hosting site lowpaymentfee.com advertises a broad catalog of x402-gated APIs spanning data analytics, AI/ML inference, finance/Web3 data, and infrastructure utilities — all priced at $0.02 per request with no API keys, no rate limits, and no commitments. However, the specific endpoint listed here (`/api/v1/products/68/inventory`) is not among the APIs advertised on the landing page, and no documentation, request schema, or response schema is available for it. The crawled docs, API, pricing, and README pages all returned only a "Connect wallet" prompt with no substantive content.
Without documentation or example payloads, the exact purpose and data returned by this inventory endpoint remain unclear. The endpoint is confirmed live (returns a valid x402 402 challenge), but prospective callers should be aware that there is no published input/output schema to guide integration.
Capabilities
Use cases
- —Querying inventory status for product ID 68 via a micropayment-gated API
- —Integrating pay-per-request product data into an agent workflow without API key management
- —Demonstrating x402 protocol payment flows on Base with USDC
Fit
Best for
- —Agents or services that need on-demand product inventory data with no subscription
- —Developers experimenting with x402 payment protocol integrations
- —Workflows requiring keyless, pay-as-you-go API access on Base
Not for
- —Users who need detailed API documentation or guaranteed SLAs before integrating
- —High-volume inventory queries where per-request pricing may add up
- —Anyone needing non-USDC or non-Base-network payment options
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/products/68/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, but there is no documentation, no input/output schema, no example requests or responses, and the specific endpoint is not listed on the provider's own landing page. Effectively a stub listing.
Warnings
- —No documentation available — docs, API, pricing, and README pages all return only a wallet-connect prompt with no content.
- —The specific endpoint /api/v1/products/68/inventory is not listed among the provider's advertised APIs on the landing page.
- —No input or output schema is published; callers must guess at the request body format.
- —Purpose of 'product 68 inventory' is entirely unclear — could be placeholder or test data.
Citations
- —The endpoint returns a valid x402 402 challenge with maxAmountRequired of 20000 base units of USDC on Base network.https://lowpaymentfee.com/api/v1/products/68/inventory
- —The site advertises $0.02 per request pricing with no API keys, no rate limits, and instant access on Base network.https://lowpaymentfee.com
- —USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913.https://lowpaymentfee.com/api/v1/products/68/inventory