I’m currently investigating the available web analytics API, to see how they are designed, and what features they offer.

Here is a listing of the Web statistics APIs I found, along with their documentation page:

1. Piwik web analytics API tutorial and full API reference (more than 50 methods)
2. W3Counter - Web Stats API
3. Help with Clicky | Clicky
4. Chapter 3. The phpOpenTracker API
5. FeedBurner - Awareness API Reference
6. PHP API - TraceWatch Web Stats
7. ClickTracks Professional Client
8. ecommstats Web Services API Documentation
9. Using the AquaLogic Interaction Analytics 2.0 OpenUsage API
   Not really an API but it can still be an interesting read
   

If you know others web analytics API on the market, please post a comment :-)

I am also gathering interesting links on “how to design & build an API” that I will post here soon.