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 protocol, settling payments in USDC on the Base network. The specific resource `/api/v1/lab/results/81` is listed under "Premium API Access" and accepts POST requests. The x402 challenge advertises a maxAmountRequired of 20,000 base units of USDC (6 decimals), which equals $0.02 per request.
The broader lowpaymentfee.com platform offers 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 priced at $0.02 per request with no API keys, no rate limits, and no minimum commitments required.
The specific `/api/v1/lab/results/81` endpoint's purpose is not clearly documented — it does not appear in the main landing page's API catalog, and the "lab/results" path suggests it may be an experimental or test endpoint. No request/response schema is provided beyond the x402 challenge metadata indicating it returns `application/json` via HTTP POST. The endpoint is live and returning a valid 402 challenge.
Capabilities
Use cases
- —Accessing premium data or lab results via a single micropayment without needing an API key
- —Integrating pay-per-use API calls into agent workflows that settle on Base in USDC
- —Testing x402 protocol payment flows with a low-cost endpoint
Fit
Best for
- —Developers experimenting with x402 payment protocol integrations
- —AI agents needing keyless, pay-per-call API access
- —Projects that want to avoid subscription commitments for occasional API calls
Not for
- —Users who need detailed documentation or well-defined request/response schemas before integrating
- —High-volume use cases where per-request pricing at $0.02 adds up significantly compared to subscription plans
- —Anyone without a Base-compatible USDC wallet
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/lab/results/81 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-token>"Endpoint
Quality
The endpoint is live and returns a valid x402 402 challenge, but the specific resource '/api/v1/lab/results/81' has no documentation, no request/response schema, and does not appear in the site's public API catalog. Its purpose is unclear, making this effectively a stub listing.
Warnings
- —The endpoint /api/v1/lab/results/81 is not listed in the provider's public API catalog — it may be experimental or undocumented.
- —No request body schema or response schema is available; the only known output detail is mimeType 'application/json'.
- —The /pricing, /api, and /README pages returned no useful content (just 'Connect wallet'), so no additional documentation could be gathered.
Citations
- —The x402 challenge advertises maxAmountRequired of 20000 base units of USDC on Base networkhttps://lowpaymentfee.com/api/v1/lab/results/81
- —USDC asset contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Basehttps://lowpaymentfee.com/api/v1/lab/results/81
- —All endpoints priced at $0.02/request with no API keys, no rate limits, instant access on Base networkhttps://lowpaymentfee.com
- —Platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categorieshttps://lowpaymentfee.com