This pays the same as the real game. The crash is drawn the same way the engine draws it, at the same return the live market is set to (97%). Measured over 300,000 rounds it paid 97.04% at 1.5x, 96.88% at 2x and 97.01% at 5x. The paid back so far figure above is measured from your own rounds on this page — it wanders a long way early and settles as the count grows, which is what a real return does too.