International Champions Cup is a pre-season tournament for Premier League, La Liga, Serie A and etc tournaments which was started in 2013 and since than it has gone global from United States to Australia and China.

ICC Organizers are paying $20 million just in appearance fee to clubs like Manchester United, Real Madrid and Barcelona to tour USA, Australia or China.

Real Madrid are currently in USA where they will play 3 friendly matches and they will be getting around £15m million guaranteed appearance fee plus add-ons depending crowd numbers.
International Champions Cup 2016 – Appearance Fee
Real Madrid£15 million guaranteed appearance fee plus add-ons
Manchester United£12 million guaranteed for two matches in China
PSG £9 million guaranteed for three matches in USA
Chelsea £9 million (three matches in USA)
Liverpool £9 million (three matches in USA)
Bayern Munich£9 million (three matches in USA)
Juventus£6 million for two matches in Australia
Tottenham£6 million two matches in Australia
AC Milan £9 million
Inter Milan £9 million
Atletico Madrid £2 million for a single friendly in Australia
Borussia Dortmund £5 million (two matches in China)
FC Barcelona £9 million (three matches across three different venues around Europe)