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 95) behind an x402 paywall. The endpoint 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). No API keys or rate limits are required — callers simply attach an X-PAYMENT header with a valid x402 payment proof.
The hosting provider, lowpaymentfee.com, operates a broader suite of x402-gated APIs spanning data analytics, AI/ML inference (sentiment analysis, summarization, classification, embeddings), finance/crypto data feeds, and infrastructure utilities — all priced at $0.02 per request. However, this specific listing covers only the `/api/v1/products/95/inventory` endpoint. The endpoint's description is simply "Premium API Access," and no further documentation, request/response schemas, or example payloads are available from the provider's site (docs, pricing, and README pages all render only a wallet-connect prompt with no substantive content).
Because there is no OpenAPI spec, no documented request body schema, and no sample responses, the actual data returned by this endpoint is unknown. Callers should expect a JSON response related to product inventory but will need to experiment to determine the exact structure.
Capabilities
Use cases
- —Querying inventory status for product ID 95 via a single paid API call
- —Integrating pay-per-request inventory checks into an automated agent workflow
- —Accessing product data without managing API keys or subscriptions
Fit
Best for
- —Agents needing on-demand inventory data with crypto micropayments
- —Developers exploring x402 protocol integrations on Base
- —Use cases requiring keyless, pay-as-you-go API access
Not for
- —High-volume inventory polling where per-request costs add up quickly
- —Users who need detailed API documentation or guaranteed SLAs before integrating
- —Non-crypto workflows that cannot produce x402 payment headers
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/products/95/inventory \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-proof>"Endpoint
Quality
The endpoint is live (402 challenge captured) and pricing is clear ($0.02 USDC on Base), but there is no OpenAPI spec, no request/response schema, no documentation beyond a generic label, and no example payloads. The actual functionality behind 'Premium API Access' for product 95 inventory is opaque.
Warnings
- —No OpenAPI or schema documentation available — request and response formats are unknown
- —Provider docs, pricing, and README pages render only a wallet-connect prompt with no substantive content
- —The endpoint description 'Premium API Access' is generic and does not clarify what data is returned
- —Actual product inventory data quality and freshness are unverifiable
Citations
- —The endpoint returns a 402 challenge requesting USDC payment on Base network with maxAmountRequired of 20000 base unitshttps://lowpaymentfee.com/api/v1/products/95/inventory
- —All APIs on lowpaymentfee.com are priced at $0.02 per request with no API keys, no rate limits, and instant access on Base networkhttps://lowpaymentfee.com
- —USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913https://lowpaymentfee.com/api/v1/products/95/inventory