For The International Dota 2 Battle Pass, the usual amount was 25% of Battle Pass revenue going into the tournament prize pool.

That was the standard model in the years when Valve still ran TI Battle Pass crowdfunding. Valve later stopped releasing an annual Battle Pass for The International, so that 25% split is no longer the current system.

Quick scoop

  • Battle Pass to TI prize pool: 25%.
  • Status now: Valve discontinued the annual TI Battle Pass.
  • Why people still mention it: TI prize pools used to be heavily boosted by Battle Pass sales.

TL;DR: It was 25% for the old TI Battle Pass model, but Valve no longer uses that yearly Battle Pass format.