Unlimited API calls on a monthly per-domain basis. SiteStat.us is a cost effective solution for routing knowledge for your distributed application.
SiteStat.us features a resilient architecture to support query spikes, and to provide accurate status for many domains. SiteStat.us is fully cloud hosted, and designed for reliability.
SiteStat.us exports a JSON API with CORS headers. It's trivial to consume and easy to set up.