Pay-per-call API platform on Base (USDC) covering data, AI, finance, and utility endpoints.
What it does
lowpaymentfee.com is an x402-enabled API platform that offers a broad catalog of pay-per-request endpoints settled in USDC on the Base network. The specific endpoint at `/api/v1/transfers/170` is listed as "Premium API Access" and accepts POST requests with an x402 payment challenge. The maximum amount required is 20,000 base units of USDC (6 decimals), which equals $0.02 per request.
The platform advertises 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 priced at $0.02 per request with no API keys, no rate limits, and no minimum commitments required.
However, the specific endpoint being listed (`/api/v1/transfers/170`) does not clearly map to any of the documented API categories. Its description is simply "Premium API Access," and there is no documentation explaining what data or functionality it returns. The docs, pricing, and README pages all render only a "Connect wallet" prompt with no further content. Without an OpenAPI schema, example requests, or response documentation, the actual behavior of this endpoint remains unclear.
Capabilities
Use cases
- —Paying per-call for data analytics or AI inference without subscription commitments
- —Accessing financial price feeds and exchange rates via micropayments
- —Using utility services like geocoding or validation on a per-request basis
Fit
Best for
- —Developers wanting zero-commitment, pay-as-you-go API access
- —Agent workflows that need x402-native endpoints on Base
- —Projects needing low-cost per-request pricing without API key management
Not for
- —Users who need detailed API documentation or OpenAPI specs before integrating
- —High-volume use cases where subscription pricing would be cheaper
- —Anyone requiring non-USDC or non-Base-network payment options
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/transfers/170 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-header>"Endpoint
Quality
The endpoint is live (returns 402 as expected for x402), but there is no OpenAPI schema, no request/response examples, and no documentation beyond a wallet-connect prompt. The specific endpoint '/api/v1/transfers/170' has no clear description of what it does. Pricing is clear ($0.02/request in USDC on Base), but the lack of any functional documentation makes this effectively a stub.
Warnings
- —The endpoint path '/api/v1/transfers/170' does not correspond to any documented API category on the site
- —All documentation pages (docs, pricing, README, api) render only 'Connect wallet' with no usable content
- —No OpenAPI schema, request format, or response format is available
- —The actual functionality behind 'Premium API Access' is unknown
Citations
- —The platform lists APIs across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories, all at $0.02/requesthttps://lowpaymentfee.com
- —Pricing is $0.02 per request with no API keys, no rate limits, and instant access on Base networkhttps://lowpaymentfee.com
- —The x402 challenge specifies maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Basehttps://lowpaymentfee.com/api/v1/transfers/170