Pay-per-call API platform on Base network via x402 — $0.02/request in USDC.
What it does
lowpaymentfee.com is an x402-enabled API platform that offers a variety of endpoints across data & analytics, AI & machine learning, finance & Web3, and infrastructure utility categories. All endpoints are priced at $0.02 per request, paid in USDC on the Base network with no API keys, rate limits, or commitments required.
The specific endpoint at `/api/v1/transfers/113` is listed as "Premium API Access" and accepts POST requests. The x402 challenge confirms it is live, requiring up to 20,000 base units of USDC (0x8335…2913 on Base, 6 decimals = $0.02) per call. Payment is settled on-chain to the provider's wallet. The platform advertises additional endpoints for sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, geocoding, validation, conversion, and data export — all at the same $0.02 price point.
Documentation is extremely sparse. The docs, API, pricing, and README pages all render only a "Connect wallet" prompt with no further content. There is no OpenAPI schema, no request/response examples, and no description of what the `/api/v1/transfers/113` endpoint actually returns or what input it expects beyond a POST with JSON content type. The platform's purpose and the specific functionality behind "Premium API Access" remain unclear from available materials.
Capabilities
Use cases
- —Paying per-call for API access without managing API keys or subscriptions
- —Programmatic agent-to-service payments using USDC on Base
- —Accessing utility or data endpoints with on-chain micropayments
Fit
Best for
- —Developers wanting zero-commitment, pay-as-you-go API access
- —AI agents that can settle x402 payments autonomously
- —Users who prefer crypto-native billing over traditional API key management
Not for
- —Users needing detailed API documentation or OpenAPI specs before integrating
- —High-volume use cases where per-request pricing at $0.02 may be costly
- —Users without a Base-network USDC wallet
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/transfers/113 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-header>"Endpoint
Quality
The endpoint is live and returns a valid x402 challenge, but there is no documentation, no OpenAPI schema, no request/response examples, and no explanation of what 'Premium API Access' at /api/v1/transfers/113 actually does. All doc pages return only 'Connect wallet'. This is effectively a stub listing.
Warnings
- —No documentation available — all doc/pricing/API pages render only 'Connect wallet'
- —No OpenAPI or schema describing request parameters or response format
- —The purpose of the /api/v1/transfers/113 'Premium API Access' endpoint is completely undocumented
- —Cannot verify what data or service is actually returned after payment
Citations
- —All endpoints priced at $0.02 per request with no API keys, rate limits, or minimumshttps://lowpaymentfee.com
- —Platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categorieshttps://lowpaymentfee.com
- —x402 challenge confirms live endpoint requiring 20000 base units of USDC on Base (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913)https://lowpaymentfee.com/api/v1/transfers/113
- —Docs, API, pricing, and README pages all show only 'Connect wallet'https://lowpaymentfee.com/docs