Pay-per-call API platform on Base (USDC) offering data, AI, finance, and utility endpoints at $0.02/request.
What it does
lowpaymentfee.com is an x402-enabled API platform that provides a broad suite of pay-per-request endpoints settled in USDC on the Base network. The specific endpoint at `/api/v1/lab/results/12` is listed as "Premium API Access" and returns an x402 challenge requiring up to 20,000 base units of USDC (i.e., $0.02) per call. The platform advertises no API keys, no rate limits, and instant access — callers simply attach an X-PAYMENT header with a valid x402 payment proof.
The provider's landing page lists four categories of APIs: 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 uniformly priced at $0.02 per request.
The specific endpoint being listed (`/api/v1/lab/results/12`) does not clearly map to any of the documented categories — it appears under a `/lab/` path that is not described on the landing page. No OpenAPI schema, request/response examples, or detailed documentation were found for this or any other endpoint. The endpoint is confirmed live via a valid 402 challenge, but the actual payload format and response structure remain unknown.
Capabilities
Use cases
- —Accessing premium data or lab results via a single pay-per-call transaction
- —Integrating low-cost API calls into agent workflows without managing API keys
- —Paying for API access with USDC on Base without subscriptions or commitments
Fit
Best for
- —Developers wanting keyless, pay-per-use API access
- —AI agents that can settle x402 payments autonomously
- —Users who prefer crypto micropayments over traditional billing
Not for
- —Users needing detailed API documentation or guaranteed SLAs before integrating
- —Anyone who cannot transact in USDC on the Base network
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/lab/results/12 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-proof>"Endpoint
Quality
The endpoint is confirmed live with a valid x402 402 challenge, but there is no OpenAPI schema, no request/response examples, and no documentation for the /lab/results/12 path. The landing page documents other endpoints but not this one, making the actual functionality unclear.
Warnings
- —The /api/v1/lab/results/12 path is not documented on the provider's landing page — its purpose and expected input/output are unknown.
- —No OpenAPI spec, request body schema, or response schema is available for any endpoint on this platform.
- —The /pricing, /api, and /README pages returned only a 'Connect wallet' prompt with no useful content.
- —Actual response data quality and correctness cannot be verified without making a paid request.
Citations
- —The endpoint returns a 402 challenge requiring up to 20,000 base units of USDC ($0.02) on Base network.https://lowpaymentfee.com/api/v1/lab/results/12
- —The platform lists endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories, all priced at $0.02/request.https://lowpaymentfee.com
- —The platform advertises no API keys, no rate limits, and instant access on the Base network.https://lowpaymentfee.com
- —The USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913.https://lowpaymentfee.com/api/v1/lab/results/12