x402-gated premium API endpoint on Base, pay-per-request with USDC at $0.02/call.
What it does
This endpoint at `/api/v1/lab/results/39` is part of the lowpaymentfee.com platform, which offers a suite of x402-protocol pay-per-request APIs spanning data analytics, AI/ML inference, finance/Web3 data, and infrastructure utilities. The specific resource at path `/lab/results/39` is labeled "Premium API Access" and returns `application/json` content. It accepts POST requests and settles payments on the Base network using USDC (contract `0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913`).
The x402 challenge advertises a `maxAmountRequired` of 20000 base units. Since USDC uses 6 decimals, this equals $0.02 per request — consistent with the site-wide pricing of $0.02/request displayed on the landing page. The platform emphasizes no API keys, no rate limits, and instant access; payment is handled entirely via the x402 `X-PAYMENT` header. The endpoint uses the "exact" payment scheme with a 300-second timeout.
Note: The specific functionality behind `/api/v1/lab/results/39` is not documented on the landing page, which lists analytics, AI, finance, and utility endpoints but does not mention a `/lab/results/` path. The endpoint's purpose — whether it returns lab test results, experimental data, or something else — cannot be determined from available material. The response schema is also undocumented. Treat this as a partially documented endpoint.
Capabilities
Use cases
- —Fetching premium data or results behind a per-request paywall
- —Agent-driven programmatic access to gated content without API keys
- —Micropayment-based API consumption on Base L2
Fit
Best for
- —Agents or applications that need keyless, pay-as-you-go API access
- —Developers experimenting with x402 protocol integrations
- —Use cases requiring low-cost per-request payments settled on-chain
Not for
- —Users who need detailed documentation or a well-defined response schema before integrating
- —High-volume consumers who prefer subscription-based pricing over per-call payments
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/lab/results/39 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-token>"Endpoint
Quality
The endpoint is live (402 challenge captured) and pricing is clear ($0.02 USDC on Base). However, the specific resource at /lab/results/39 is not documented anywhere on the site, there is no OpenAPI spec, no response schema, and no example request/response. The endpoint's actual purpose is unknown.
Warnings
- —The /api/v1/lab/results/39 path is not listed among the documented endpoints on the landing page — its purpose is unclear.
- —No OpenAPI specification or response schema is available.
- —No example responses or detailed documentation could be found; /api, /pricing, and /README pages all returned only a 'Connect wallet' prompt.
Citations
- —The x402 challenge returns maxAmountRequired of 20000 in USDC (6 decimals) on Base, equaling $0.02 per request.https://lowpaymentfee.com/api/v1/lab/results/39
- —The site advertises $0.02/request pricing with no API keys, no rate limits, and instant access on the Base network.https://lowpaymentfee.com
- —USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913.https://lowpaymentfee.com/api/v1/lab/results/39