Pay-per-call lab results endpoint on Base via x402 — $0.02 per request in USDC.
What it does
This endpoint at `/api/v1/lab/results/60` is part of the lowpaymentfee.com platform, which offers a suite of pay-per-request APIs spanning data analytics, AI/ML inference, finance/Web3 data, and infrastructure utilities. All endpoints are gated via the x402 protocol, settling payments in USDC on the Base network. The specific resource at `/lab/results/60` is labeled "Premium API Access" in the x402 challenge but its exact data payload is not documented — the provider's landing page does not list this particular path among its advertised API categories.
The x402 challenge confirms the endpoint is live and accepts POST requests. The maximum amount required is 20,000 base units of USDC (0x8335… on Base), which equals $0.02 USD (USDC uses 6 decimals). This matches the provider's uniform $0.02/request pricing displayed on the homepage. No API keys are required; payment is handled entirely through the X-PAYMENT header. The provider advertises no rate limits and instant access.
Because the `/lab/results/60` path is not among the documented API categories on the landing page, the actual response schema and purpose of this endpoint are unclear. It may return lab/test result data or serve as a demonstration endpoint. There is no OpenAPI spec, no detailed documentation, and the pricing, README, and API pages all resolve to a minimal "Connect wallet" prompt with no additional information.
Capabilities
Use cases
- —Fetching lab or test result data behind a micropayment wall
- —Demonstrating x402 payment flows on Base with USDC
- —Agent-driven data retrieval with per-call crypto payments
Fit
Best for
- —Developers experimenting with x402 payment protocol
- —Agents that need low-cost per-request data access without API keys
- —Projects already operating on the Base L2 network with USDC
Not for
- —Users who need well-documented API schemas and response contracts
- —High-volume batch processing where per-request pricing adds up
- —Anyone requiring fiat-only payment rails
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/lab/results/60 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-token>"Endpoint
Quality
The endpoint is confirmed live via a valid 402 challenge with clear pricing ($0.02 USDC on Base). However, the specific /lab/results/60 path is not documented anywhere on the provider's site, there is no OpenAPI spec, no response schema, and no example payloads. The purpose and output of this endpoint are entirely unknown.
Warnings
- —The /api/v1/lab/results/60 path is not listed among the provider's documented APIs — its purpose is unclear.
- —No OpenAPI specification or response schema is available.
- —Documentation pages (/pricing, /README, /api) return only a 'Connect wallet' prompt with no useful content.
- —The endpoint's actual data payload cannot be verified without making a paid request.
Citations
- —The x402 challenge returns maxAmountRequired of 20000 base units of USDC on Base, equaling $0.02.https://lowpaymentfee.com/api/v1/lab/results/60
- —The provider advertises uniform $0.02/request pricing with no API keys, no rate limits, and instant access.https://lowpaymentfee.com
- —USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base network.https://lowpaymentfee.com/api/v1/lab/results/60