Pay-per-call premium API access on Base via x402 — $0.02/request in USDC.
What it does
This endpoint at lowpaymentfee.com provides pay-per-request API access using the x402 protocol, settling payments in USDC on the Base network. The specific resource `/api/v1/lab/results/49` is listed under "Premium API Access" and costs up to $0.02 per call (maxAmountRequired of 20,000 base units of USDC with 6 decimals = $0.02). No API keys, rate limits, or subscriptions are required — each request is paid individually via an X-PAYMENT header.
The broader lowpaymentfee.com platform advertises a wide catalog of endpoints spanning data & analytics (metrics, reports, data export, insights), AI & machine learning (sentiment analysis, text summarization, classification, embeddings), finance & Web3 (price feeds, exchange rates, token quotes, gas estimates), and infrastructure utilities (geocoding, validation, conversion, generation). All endpoints are uniformly priced at $0.02 per request.
The specific endpoint being listed (`/api/v1/lab/results/49`) falls under a "lab/results" path that is not explicitly described in the site's public catalog. Its exact output schema and data content are unknown — the x402 challenge confirms it returns `application/json` via POST, but no further documentation or example responses are available. Treat this as a generic premium data endpoint until more documentation surfaces.
Capabilities
Use cases
- —Accessing premium data results behind a per-call paywall without subscriptions
- —Agent-driven workflows that need on-demand paid API calls settled in USDC on Base
- —Programmatic retrieval of lab/results data with instant crypto micropayments
Fit
Best for
- —Developers wanting zero-commitment, pay-as-you-go API access
- —AI agents with x402-compatible wallets on Base
- —Users who prefer crypto micropayments over traditional API key subscriptions
Not for
- —Users who need detailed documentation or guaranteed SLAs before integrating
- —Anyone without a Base-network USDC wallet or x402-compatible client
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/lab/results/49 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-token>"Example
Request
{
"url": "https://lowpaymentfee.com/api/v1/lab/results/49",
"method": "POST",
"headers": {
"X-PAYMENT": "<x402-payment-token>",
"Content-Type": "application/json"
}
}Endpoint
Quality
The x402 challenge is live and confirms pricing and payment details, but the specific endpoint /api/v1/lab/results/49 has no documentation, no output schema, and no example responses. The site's public catalog does not list this path, making it effectively a stub listing with verified liveness but unknown functionality.
Warnings
- —The endpoint path /api/v1/lab/results/49 is not listed in the provider's public API catalog — its purpose and response format are unknown.
- —No OpenAPI spec, output schema, or example responses are available for this endpoint.
- —The /pricing, /api, and /README pages returned only a 'Connect wallet' prompt with no useful documentation.
Citations
- —The x402 challenge returns maxAmountRequired of 20000 base units of USDC (asset 0x8335…) on Base network, equaling $0.02 per request.https://lowpaymentfee.com/api/v1/lab/results/49
- —The site advertises uniform $0.02/request pricing with no API keys, no rate limits, and instant access on Base network.https://lowpaymentfee.com
- —The platform offers endpoints across data & analytics, AI & ML, finance & Web3, and infrastructure categories.https://lowpaymentfee.com