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 86) 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 given USDC's 6 decimals.
The hosting provider, 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 minimum commitments. However, the specific endpoint listed here (/api/v1/products/86/inventory) is not among the APIs advertised on the provider's landing page, and no documentation, request schema, or response schema is available for it. The title "Premium API Access" is the only description provided by the x402 challenge.
Because there is no OpenAPI spec, no request/response examples, and no documentation beyond the generic landing page, the actual data returned by this endpoint is unknown. Callers should treat this as an opaque inventory lookup until further documentation surfaces.
Capabilities
Use cases
- —Querying inventory status for product ID 86 via a micropayment-gated API call
- —Integrating pay-per-request product data into an autonomous agent workflow
- —Demonstrating x402 payment protocol integration on Base
Fit
Best for
- —Developers experimenting with x402 payment protocol on Base
- —Agents that need to make one-off inventory lookups without API key provisioning
- —Low-volume, on-demand product data retrieval
Not for
- —High-volume inventory monitoring requiring bulk or streaming access
- —Users who need detailed API documentation and guaranteed SLAs
- —Anyone looking for the advertised AI, analytics, or finance endpoints (this is a different path)
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/products/86/inventory \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-token>"Endpoint
Quality
The endpoint is live (returns a valid x402 402 challenge) and pricing is clear ($0.02 USDC on Base). However, there is no documentation, no request/response schema, no examples, and the specific endpoint path is not listed among the provider's advertised APIs. Effectively a stub listing.
Warnings
- —No documentation or schema available for this specific endpoint path
- —The endpoint /api/v1/products/86/inventory is not listed among the provider's advertised APIs on the landing page
- —No request body schema or response schema provided — callers cannot know what to send or expect
- —Docs, API, pricing, and README pages all render only a 'Connect wallet' prompt with no useful content
Citations
- —The x402 challenge requires a maximum of 20,000 base units of USDC on Base networkhttps://lowpaymentfee.com/api/v1/products/86/inventory
- —USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Basehttps://lowpaymentfee.com/api/v1/products/86/inventory
- —Provider advertises $0.02 per request, no API keys, no rate limits, instant access on Base networkhttps://lowpaymentfee.com
- —The /api/v1/products/86/inventory path is not among the APIs listed on the provider landing pagehttps://lowpaymentfee.com