https://medium.freecodecamp.org/how-we-serve-25m-api-calls-from-10-scalable-global-endpoints-for-150-a-month-911002703280

I woke up on Black Friday last year to a barrage of emails from users reporting 503 errors from the ipdata API.

Our users typically call our API on each page request on their websites to geolocate their users and localize their content. So this particular failure was directly impacting our users’ websites on the biggest sales day of the year.