Pay-per-call premium API access on Base via x402 — $0.02/request in USDC.
What it does
This endpoint at lowpaymentfee.com is part of a broader platform offering pay-per-request APIs across data analytics, AI/ML inference, finance/Web3, and infrastructure utilities. The specific resource `/api/v1/lab/results/38` is listed under "Premium API Access" and is gated by the x402 payment protocol, settling in USDC on the Base network.
The x402 challenge confirms the endpoint is live and accepts POST requests. The maximum amount required is 20,000 base units of USDC (which uses 6 decimals), equating to $0.02 per request. The platform advertises no API keys, no rate limits, and instant access — you simply attach an x402 payment header to each call. All endpoints on the platform appear to share the same $0.02 price point.
However, the specific functionality behind `/api/v1/lab/results/38` is unclear. The path suggests retrieving lab results by ID (38), but no documentation, request schema, or response schema is available beyond the generic "Premium API Access" label. The platform's landing page groups endpoints into categories (Data & Analytics, AI & ML, Finance & Web3, Infrastructure), but this particular path does not appear in any of those listed categories. Without further documentation, the exact data returned and the expected POST body are unknown.
Capabilities
Use cases
- —Retrieving lab or experimental results behind a per-call paywall
- —Programmatic access to premium data without subscription or API key management
- —Agent-driven data retrieval with automatic USDC micropayments on Base
Fit
Best for
- —Developers wanting keyless, pay-as-you-go API access
- —AI agents that can settle x402 payments autonomously
- —Users who prefer crypto micropayments over traditional billing
Not for
- —Users needing detailed documentation or guaranteed SLAs before integrating
- —Anyone requiring non-crypto payment methods
- —Bulk data retrieval where per-call pricing becomes expensive at scale
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/lab/results/38 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-token>"Endpoint
Quality
The endpoint is live (402 challenge confirmed) and pricing is clear ($0.02 USDC on Base), but there is no documentation for this specific path, no request/response schema, and the purpose of '/api/v1/lab/results/38' is entirely opaque. The crawl pages beyond the landing page returned only 'Connect wallet' with no useful content.
Warnings
- —No documentation exists for the specific /api/v1/lab/results/38 endpoint — its purpose and expected input/output are unknown.
- —This path does not appear in the platform's own listed API catalog, raising questions about whether it is a test or placeholder endpoint.
- —No OpenAPI spec, no request body schema, and no response schema are available.
- —The platform's /api, /pricing, and /README pages returned no meaningful content during crawl.
Citations
- —The x402 challenge returns maxAmountRequired of 20000 base units of USDC (USD Coin) on Base network, equating to $0.02 per request.https://lowpaymentfee.com/api/v1/lab/results/38
- —The platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access on Base network.https://lowpaymentfee.com
- —The USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913.https://lowpaymentfee.com/api/v1/lab/results/38