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 suite of pay-per-request APIs accessible via the x402 payment protocol on the Base network. The specific resource `/api/v1/lab/results/29` is listed under "Premium API Access" and returns JSON content. Payment is settled in USDC (USD Coin) on Base, with a maximum amount of 20,000 base units (i.e., $0.02 per request, since USDC uses 6 decimals). No API keys, rate limits, or subscriptions are required — callers simply attach an x402 payment header to each POST request.
The parent site 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 share the same $0.02/request pricing model. However, the specific endpoint `/api/v1/lab/results/29` does not clearly map to any of the publicly listed categories — it appears under a "lab" path, suggesting it may be an experimental or unlisted resource.
The endpoint is live and returns a proper x402 challenge (HTTP 402) when called without payment. There is no OpenAPI schema, detailed documentation, or example responses available from the crawled pages, so the exact data returned by this endpoint is unknown. The payment recipient address is `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3`, and the USDC contract on Base (`0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913`) is used for settlement.
Capabilities
Use cases
- —Accessing premium data or lab results without subscription or API key management
- —Agent-driven workflows that need on-demand paid API calls settled in USDC on Base
- —Exploring experimental or lab-grade data endpoints with minimal commitment
Fit
Best for
- —Developers wanting zero-friction, keyless API access with crypto micropayments
- —AI agents that can autonomously pay for API calls via x402
- —Users on the Base network looking for low-cost per-request data services
Not for
- —Users who need detailed documentation or guaranteed SLAs before integrating
- —Anyone without a Base-compatible USDC wallet or x402 client
- —High-volume consumers who would benefit from bulk pricing or subscriptions
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/lab/results/29 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-token>"Endpoint
Quality
The endpoint is live and returns a valid x402 challenge, but there is no documentation, no OpenAPI schema, no example responses, and the specific resource path (/api/v1/lab/results/29) is not explained anywhere on the site. The purpose and output of this endpoint are unknown.
Warnings
- —No documentation or OpenAPI schema available for this endpoint
- —The path /api/v1/lab/results/29 does not match any publicly listed API on the site — purpose is unclear
- —No example request or response bodies are available
- —The /api, /pricing, and /README pages returned only a 'Connect wallet' prompt with no useful content
Citations
- —The endpoint returns a valid x402 challenge with HTTP 402 and accepts USDC on Basehttps://lowpaymentfee.com/api/v1/lab/results/29
- —maxAmountRequired is 20000 base units of USDC (6 decimals), equaling $0.02 per requesthttps://lowpaymentfee.com/api/v1/lab/results/29
- —The site advertises $0.02/request pricing with no API keys, no rate limits, and instant access on Basehttps://lowpaymentfee.com
- —USDC contract address on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913https://lowpaymentfee.com/api/v1/lab/results/29