Proxy11 gives you free proxy lists on the web and through a simple API.
Browse free proxy lists on the site, or pull them through the API as TXT, JSON, CSV or XML. There are SDKs for Python and Node.js, a rotation API, and a free proxy checker.
The lists, the checker and a free API key cost nothing. A free key returns 50 proxies per request. Ultimate costs $19.90 a year and returns up to 5,000.
Anyone can run a public proxy, and the person running it can see traffic that isn't encrypted. Don't send passwords or payment details through one, and follow the rules of the sites you visit.
Email [email protected], or see the contact page for support tickets.