You can watch the original "American Pie" (1999) online through several streaming and rental options:

• Streaming on Starz, including Starz Apple TV Channel, Starz Roku Premium Channel, and Starz Amazon Channel, as well as Philo

• Buying or renting on platforms like Amazon Video, Apple TV, Fandango At Home, and Microsoft Store

• It is also available for streaming on Amazon Prime Video and Amazon Prime Video with Ads in the UK

• Additionally, "American Pie" is available on Netflix in some regions

So depending on your location and preferred platform, you can stream it on Starz or Amazon Prime Video, or rent/buy it on Apple TV, Amazon Video, or Microsoft Store