x402-gated product inventory endpoint on Base, pay $0.02 per request in USDC.
What it does
This endpoint at lowpaymentfee.com provides access to a product inventory resource (product ID 46) via the x402 payment protocol. It accepts POST requests and returns JSON data upon payment of 20,000 base units of USDC on the Base network (equivalent to $0.02 per request, since USDC uses 6 decimals).
The provider operates a broader platform offering multiple x402-gated API categories including Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure utilities—all priced at $0.02 per request. The specific endpoint cataloged here (/api/v1/products/46/inventory) is labeled "Premium API Access" but its exact response schema and data contents are not documented in the available crawl material.
Payment is settled on-chain via the x402 exact scheme to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 using USDC (contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base. No API keys or rate limits are advertised; access is purely pay-per-call. The endpoint is live and returning a valid 402 challenge.
Capabilities
Use cases
- —Querying product inventory data without needing an API key
- —Integrating pay-per-request inventory checks into automated agent workflows
- —Demonstrating x402 protocol payment flows on Base
Fit
Best for
- —Agents that can settle x402 payments in USDC on Base
- —Developers exploring x402 micropayment-gated APIs
- —Low-volume, on-demand inventory queries without subscription commitments
Not for
- —High-volume bulk inventory queries where per-call pricing adds up
- —Users without a Base-compatible USDC wallet
- —Applications requiring detailed API documentation or guaranteed SLAs
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/products/46/inventory \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402_payment_token>"Endpoint
Quality
The endpoint is live and returns a valid x402 challenge, but there is no documentation of the request body schema, response format, or what 'Premium API Access' for product 46 inventory actually returns. The docs, pricing, and README pages all just show 'Connect wallet' with no useful content.
Warnings
- —No response schema or example documented—actual data returned is unknown
- —The endpoint is labeled 'Premium API Access' generically; its specific functionality for product 46 inventory is unclear
- —Documentation pages (/docs, /pricing, /README) are effectively empty (only show 'Connect wallet')
- —No OpenAPI spec or detailed API reference available
Citations
- —Endpoint returns 402 with x402 challenge requiring 20000 base units of USDC on Basehttps://lowpaymentfee.com/api/v1/products/46/inventory
- —Platform advertises $0.02 per request, no API keys, no rate limits, instant access on Base networkhttps://lowpaymentfee.com
- —USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913https://lowpaymentfee.com/api/v1/products/46/inventory