[alphast0rm]

For a single event, The International 2018 for Dota 2 had a prize pool of $25,532,177 USD [1] and "set the record for largest single tournament prize pool in esports history for the fifth consecutive year" [2].

[1] https://liquipedia.net/dota2/The_International/2018#Prize_Po...

[2] http://www.espn.com/esports/story/_/id/24429755/the-internat...