Pay-per-call lab results endpoint on Base via x402 — $0.02 per request in USDC.
What it does
This x402-enabled endpoint at `/api/v1/lab/results/28` is part of the lowpaymentfee.com platform, which offers a broad suite of pay-per-request APIs spanning data analytics, AI/ML inference, finance/Web3 data, and infrastructure utilities. All endpoints on the platform use the x402 payment protocol, settling in USDC on the Base network at $0.02 per request. There are no API keys, no rate limits, and no minimum commitments — callers simply attach an x402 payment header to each request.
The specific endpoint `/api/v1/lab/results/28` is listed under the title "Premium API Access" but its exact functionality is unclear from the available documentation. The provider's landing page does not list this particular path among its advertised API categories (Data & Analytics, AI & ML, Finance & Web3, Infrastructure), so it may be an unlisted or experimental endpoint. The x402 challenge confirms it is live, accepts POST requests, and requires a maximum of 20,000 base units of USDC (i.e., $0.02) per call. Payment is sent to `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` on the Base network, with a 300-second timeout.
Because no OpenAPI schema, response examples, or detailed documentation exist for this specific endpoint, callers should treat it as minimally documented. The platform itself appears healthy (root returns 200, x402 challenge is well-formed), but the purpose and response format of this particular resource remain unspecified.
Capabilities
Use cases
- —Accessing premium data results behind a per-call USDC micropayment
- —Integrating pay-per-request data retrieval into agent workflows
- —Testing x402 payment protocol integrations with a low-cost endpoint
Fit
Best for
- —Developers experimenting with x402 payment flows on Base
- —Agents that need keyless, pay-as-you-go API access
- —Low-cost micropayment API consumption without subscriptions
Not for
- —Users who need detailed documentation or guaranteed SLAs before integrating
- —High-throughput batch processing where per-call payments add friction
- —Anyone without a Base-compatible USDC wallet
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/lab/results/28 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-token>"Endpoint
Quality
The x402 challenge is live and well-formed, confirming the endpoint exists and its pricing. However, this specific path (/api/v1/lab/results/28) is not documented on the provider's landing page, there is no OpenAPI schema, no response examples, and no description of what 'lab results' means. Effectively a stub listing.
Warnings
- —The endpoint path /api/v1/lab/results/28 is not listed among the provider's advertised APIs — its purpose is unknown.
- —No OpenAPI schema, response examples, or detailed documentation available for this endpoint.
- —The /api, /pricing, and /README pages all returned only a 'Connect wallet' prompt with no useful content.
- —The name 'Premium API Access' is generic and does not describe the endpoint's actual function.
Citations
- —The platform advertises $0.02 per request with no API keys, no rate limits, and instant access on the Base network.https://lowpaymentfee.com
- —The x402 challenge returns maxAmountRequired of 20000 base units of USDC (6 decimals = $0.02) on the Base network.https://lowpaymentfee.com/api/v1/lab/results/28
- —Payment is sent to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a 300-second timeout.https://lowpaymentfee.com/api/v1/lab/results/28
- —The platform lists API categories including Data & Analytics, AI & ML, Finance & Web3, and Infrastructure, but /api/v1/lab/results/28 is not among them.https://lowpaymentfee.com