Pay-per-call lab results endpoint on Base via x402, settled in USDC at $0.02/request.
What it does
This x402-enabled endpoint at lowpaymentfee.com provides premium API access to a "lab results" resource (specifically `/api/v1/lab/results/2`). It is part of a broader platform offering dozens of pay-per-call APIs spanning data & analytics, AI/ML inference, finance & Web3 data, and infrastructure utilities — all priced at $0.02 per request with no API keys, no rate limits, and no commitments required.
Payment is settled on the Base network using USDC (contract `0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913`). The x402 challenge advertises a `maxAmountRequired` of 20,000 base units, which at 6 decimals equals $0.02 USD per call. The endpoint accepts HTTP POST requests and returns `application/json` responses. No OpenAPI schema or detailed documentation for the response body was found, so the exact structure of the returned lab results data is unknown.
The platform positions itself as a low-friction, wallet-based API marketplace. All endpoints share the same $0.02 pricing and x402 payment flow. The specific `/lab/results/2` endpoint's purpose is not documented beyond the generic "Premium API Access" label, making it difficult to determine what data it actually returns without making a paid request.
Capabilities
Use cases
- —Accessing lab results data via a single paid POST request
- —Demonstrating x402 payment protocol integration
- —Building agents that consume pay-per-call data endpoints without API key management
Fit
Best for
- —Developers exploring x402 payment protocol
- —Agents needing keyless, pay-per-call API access on Base
- —Projects requiring low-cost micropayment-gated data retrieval
Not for
- —Users needing detailed documentation or response schemas before purchasing
- —High-volume batch processing where per-call pricing adds up
- —Anyone without a Base-network USDC wallet
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/lab/results/2 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-header>"Endpoint
Quality
The endpoint is live (402 challenge confirmed) and pricing is clear at $0.02/request in USDC on Base. However, there is no OpenAPI schema, no documentation of request parameters or response format, and the purpose of the 'lab results' resource is entirely opaque. The crawled pages beyond the homepage returned only 'Connect wallet' with no useful content.
Warnings
- —No documentation exists for what /api/v1/lab/results/2 actually returns
- —No request body schema or response schema available
- —The 'lab results' label is generic and unexplained — actual data content is unknown
- —Other crawled pages (/api, /pricing, /README) returned no useful content
Citations
- —The endpoint returns a 402 challenge with maxAmountRequired of 20000 base units in USDC on Base networkhttps://lowpaymentfee.com/api/v1/lab/results/2
- —All APIs on the platform are priced at $0.02 per request with no API keys, no rate limits, and instant accesshttps://lowpaymentfee.com
- —USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913https://lowpaymentfee.com/api/v1/lab/results/2