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 payment protocol, settling in USDC on the Base network. The specific resource `/api/v1/lab/results/26` is labeled "Premium API Access" and costs up to 20,000 base units of USDC (i.e., $0.02 per call, since USDC uses 6 decimals). 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 suite 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 listed at $0.02 per request. However, the specific endpoint being listed here (`/api/v1/lab/results/26`) does not clearly map to any of those advertised categories — it sits under a `/lab/results/` path, which is not documented on the landing page.
The endpoint is live and returns a valid x402 challenge (HTTP 402) with scheme "exact" on the Base network, accepting POST requests. No OpenAPI schema, detailed documentation, or example responses are available, so the exact data returned after payment is unknown. The output MIME type is `application/json`.
Capabilities
Use cases
- —Accessing premium data or lab results behind a per-call paywall
- —Agent-driven workflows that need keyless, pay-as-you-go API access
- —Testing x402 payment protocol integrations on Base
Fit
Best for
- —Developers experimenting with x402 pay-per-call patterns
- —AI agents that can autonomously pay for API calls in USDC on Base
- —Users who want no-signup, no-rate-limit API access
Not for
- —Users needing detailed documentation or guaranteed SLAs before integrating
- —High-volume consumers who need bulk pricing or subscription discounts
- —Anyone who cannot transact in USDC on the Base network
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/lab/results/26 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-token>"Endpoint
Quality
The endpoint is live and returns a valid x402 challenge, but the specific resource path `/api/v1/lab/results/26` is undocumented. No OpenAPI schema, no example request/response bodies, and no description of what data is actually returned. The landing page lists many endpoints but none matching this path, making the purpose unclear.
Warnings
- —The path /api/v1/lab/results/26 is not listed among the advertised endpoints on the landing page — its purpose and response format are unknown.
- —No OpenAPI spec, example responses, or detailed documentation available.
- —No robots.txt or agents.txt found on the origin.
- —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 maxAmountRequired of 20000 base units of USDC on Basehttps://lowpaymentfee.com/api/v1/lab/results/26
- —USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base networkhttps://lowpaymentfee.com/api/v1/lab/results/26
- —All listed endpoints priced at $0.02 per request with no API keys, no rate limitshttps://lowpaymentfee.com
- —Platform advertises endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categorieshttps://lowpaymentfee.com