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 74) 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 micropayments on the Base network.
The specific endpoint `/api/v1/products/74/inventory` is listed as "Premium API Access" and accepts POST requests. Payment is settled in USDC (contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base using the x402 "exact" scheme. The maximum amount required is 20,000 base units of USDC (6 decimals), which equals $0.02 per request. The platform advertises no API keys, no rate limits, and instant access — you simply attach an X-PAYMENT header with a valid x402 payment proof.
Documentation is extremely sparse: the /docs, /pricing, /api, and /README pages all render only a "Connect wallet" prompt with no further content. There is no OpenAPI schema, no request/response examples, and no description of what the inventory data actually contains. The endpoint is confirmed live (returns a proper 402 challenge), but without documentation it is unclear what fields the POST body expects or what the response payload looks like.
Capabilities
Use cases
- —Querying inventory status for a specific product via micropayment
- —Integrating pay-per-call product data into agent workflows
- —Accessing gated commercial data without API key registration
Fit
Best for
- —Agents that can settle x402 payments in USDC on Base
- —Quick one-off inventory lookups without subscription commitments
- —Developers exploring x402 protocol integrations
Not for
- —Users needing detailed API documentation or schemas before integrating
- —High-volume bulk inventory queries where per-call pricing adds up
- —Anyone without a Base-compatible USDC wallet
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/products/74/inventory \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-proof>"Endpoint
Quality
The endpoint is confirmed live with a valid x402 402 challenge, but documentation is essentially nonexistent — all doc pages show only 'Connect wallet'. There is no OpenAPI schema, no request/response examples, and the purpose of 'Premium API Access' for product 74 inventory is unexplained. Pricing is clear ($0.02/request in USDC on Base) but that's about all that can be confirmed.
Warnings
- —No documentation available — /docs, /pricing, /api, and /README all render only 'Connect wallet'
- —No OpenAPI or request/response schema provided; request body format is unknown
- —The specific meaning of 'products/74/inventory' is undocumented — unclear what data is returned
- —The endpoint name 'Premium API Access' is generic and does not describe actual functionality
Citations
- —The endpoint returns a valid x402 402 challenge with maxAmountRequired of 20000 base units of USDC on Basehttps://lowpaymentfee.com/api/v1/products/74/inventory
- —Platform pricing is $0.02 per request with no API keys, no rate limits, and instant access on Base networkhttps://lowpaymentfee.com
- —USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913https://lowpaymentfee.com/api/v1/products/74/inventory
- —Documentation pages (/docs, /pricing, /api, /README) render only 'Connect wallet' with no further contenthttps://lowpaymentfee.com/docs