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 32) behind an x402 paywall. It accepts POST requests and returns JSON. Payment is settled on the Base network using USDC (contract 0x8335…2913) via the x402 "exact" scheme.
The specific endpoint `/api/v1/products/32/inventory` is listed under the title "Premium API Access" but its exact response payload is undocumented — no OpenAPI spec, no example responses, and no detailed documentation were found during crawling. The provider's landing page advertises a broad suite of APIs spanning data analytics, AI/ML inference, finance, crypto, and utility services, all priced at $0.02 per request with no API keys, no rate limits, and instant access. However, this particular inventory endpoint's x402 challenge advertises a maxAmountRequired of 20,000 base units of USDC (6 decimals), which equals $0.02 — consistent with the site-wide pricing.
The endpoint is live and returned a proper 402 challenge when probed. Documentation pages (/docs, /pricing, /api, /README) all returned minimal content (just "Connect wallet"), so the actual request/response schema for this endpoint remains unknown. Without knowing what inventory data is returned or what input parameters the POST body expects, agents should treat this as an exploratory integration.
Capabilities
Use cases
- —Querying product inventory data for product ID 32 via a micropayment-gated API
- —Integrating pay-per-call inventory checks into an agent workflow without API key management
- —Demonstrating x402 protocol usage for commerce data endpoints
Fit
Best for
- —Agents needing on-demand inventory data with no subscription or API key
- —x402-compatible wallets and agent frameworks on Base
- —Low-volume, pay-as-you-go inventory lookups
Not for
- —High-volume inventory monitoring requiring bulk or subscription pricing
- —Use cases requiring detailed API documentation or guaranteed SLAs
- —Users without a Base-network USDC wallet
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/products/32/inventory \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-header>"Endpoint
Quality
The endpoint is live and returns a valid x402 challenge with clear pricing ($0.02 USDC on Base). However, there is no OpenAPI spec, no documented request/response schema, no example payloads, and all documentation pages are effectively empty. The purpose of 'product 32 inventory' is entirely opaque.
Warnings
- —No API documentation available — /docs, /pricing, /api, and /README pages all return only 'Connect wallet' with no substantive content.
- —Request body schema for the POST endpoint is unknown; no inputSchema or OpenAPI spec provided.
- —Response payload structure is undocumented; agents cannot predict what data will be returned.
- —The specific meaning of 'products/32/inventory' is unclear — it may be a demo or placeholder endpoint.
Citations
- —The endpoint returns a 402 challenge with x402Version 1, accepting USDC on Base network with maxAmountRequired of 20000 base units ($0.02).https://lowpaymentfee.com/api/v1/products/32/inventory
- —The provider advertises $0.02 per request pricing with no API keys, no rate limits, and instant access.https://lowpaymentfee.com
- —USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913.https://lowpaymentfee.com/api/v1/products/32/inventory