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 77) behind an x402 payment wall. It accepts POST requests and returns JSON. Payment is settled on the Base network using USDC (contract 0x8335…2913) at a cost of $0.02 per request (20,000 base units with 6 decimals).
The broader lowpaymentfee.com platform advertises a suite of x402-gated APIs spanning data & analytics, AI/ML inference (sentiment analysis, summarization, classification, embeddings), finance & Web3 (price feeds, exchange rates, token quotes, gas estimates), and infrastructure utilities (geocoding, validation, conversion, generation). All endpoints are listed at $0.02 per request with no API keys, no rate limits, and no minimum commitments.
However, the specific endpoint being listed here — `/api/v1/products/77/inventory` — is not documented on the site's landing page among the advertised API categories. Its exact input schema and response format are unknown beyond the x402 challenge metadata, which confirms it is live, accepts POST, and returns application/json. Without documentation or example payloads, the actual data returned by this inventory endpoint remains unclear.
Capabilities
Use cases
- —Querying inventory status for a specific product via a micropayment-gated API
- —Integrating pay-per-request product data into an agent workflow without API key management
- —Programmatic inventory checks settled in USDC on Base L2
Fit
Best for
- —Agents or bots that need on-demand inventory data without subscription overhead
- —Developers experimenting with x402 payment protocol integrations
- —Use cases requiring keyless, per-call API access on Base
Not for
- —High-volume inventory polling where per-request costs would accumulate quickly
- —Users who need detailed API documentation and guaranteed SLAs before integration
- —Anyone without a Base-compatible USDC wallet
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/products/77/inventory \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-token>"Endpoint
Quality
The x402 challenge is live and confirms pricing, network, and asset. However, the specific /products/77/inventory endpoint is not documented anywhere on the site, there is no OpenAPI spec, no request/response examples, and the docs/pricing/README pages are empty beyond a wallet-connect prompt. The endpoint's purpose and schema must be entirely inferred from its URL path.
Warnings
- —This specific endpoint (/api/v1/products/77/inventory) is not listed among the provider's advertised APIs — its purpose and data format are unknown.
- —No OpenAPI spec, request schema, or response examples are available.
- —Documentation pages (/docs, /pricing, /README) returned only a 'Connect wallet' prompt with no useful content.
- —The provider's advertised API categories (AI, finance, analytics, utils) do not include a 'products/inventory' category, raising questions about this endpoint's provenance.
Citations
- —The endpoint returns a 402 challenge with x402Version 1, accepting USDC on Base network with maxAmountRequired of 20000 base units.https://lowpaymentfee.com/api/v1/products/77/inventory
- —USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base.https://lowpaymentfee.com/api/v1/products/77/inventory
- —The platform advertises $0.02 per request pricing with no API keys, no rate limits, and instant access on Base network.https://lowpaymentfee.com
- —Advertised API categories include Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure utilities.https://lowpaymentfee.com