How many confirmations of transaction need to start an exchange?

Bitcoin - from 1 to 3 confirmations;

Litecoin - from 2 to 6 confirmations;

Bitcoin CASH ABC - from 1 to 3 confirmations;

Bitcoin Gold - from 1 to 3 confirmations;

ZCash - from 2 to 12 confirmations (popular exchanges carefully check deposits in this cryptocurrency);

Stellar XLM - instantly (Memo is required!);

Ripple XRP - instantly (Destination Tag is required!);

DashCoin - from 2 to 55 confirmations (popular exchanges carefully check deposits in this cryptocurrency);