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 endpoints across four categories: 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, payable in USDC on the Base network via the x402 protocol.
The specific endpoint `/api/v1/messages/173` is listed as "Premium API Access" and its 402 challenge advertises a maxAmountRequired of 20,000 base units of USDC (0x8335… on Base), which equals $0.02 given USDC's 6 decimals. Payment is made via the x402 exact scheme with no API keys, no rate limits, and no upfront commitments required. The endpoint accepts HTTP POST requests and returns application/json.
Documentation is minimal — the site's landing page lists available endpoints and pricing but provides no request/response schemas, parameter descriptions, or usage examples. The `/api`, `/pricing`, and `/README` pages all resolve to a "Connect wallet" prompt with no additional content. It is unclear what the `/api/v1/messages/173` endpoint specifically returns, as no schema or description beyond "Premium API Access" is provided.
Capabilities
Use cases
- —Accessing on-demand API services without subscription or API key management
- —Making micropayment-gated API calls from autonomous agents on Base
- —Paying per request for data, AI inference, finance, or utility endpoints
Fit
Best for
- —Agents or developers who want zero-commitment, pay-as-you-go API access
- —x402-compatible clients settling in USDC on Base
- —Low-volume or sporadic API usage where subscriptions are wasteful
Not for
- —Users needing detailed API documentation or guaranteed SLAs
- —High-volume production workloads requiring bulk pricing or dedicated support
- —Users without USDC on the Base network
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/messages/173 \
-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), but there is no documentation for what /api/v1/messages/173 actually does, no request/response schemas, and no examples. The site's ancillary pages are empty beyond a wallet-connect prompt. This is effectively a stub listing.
Warnings
- —No documentation exists for the /api/v1/messages/173 endpoint — its purpose and expected input/output are unknown.
- —The /api, /pricing, and /README pages return only a 'Connect wallet' prompt with no useful content.
- —No OpenAPI spec, request schema, or response schema is available for any endpoint on this platform.
- —The endpoint name 'Premium API Access' is generic and does not describe functionality.
Citations
- —All endpoints are priced at $0.02 per request with no API keys, no rate limits, and instant access on Base network.https://lowpaymentfee.com
- —The 402 challenge for /api/v1/messages/173 advertises maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base.https://lowpaymentfee.com/api/v1/messages/173
- —Available API categories include Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure.https://lowpaymentfee.com