Bitconnect — $2.5 Billion

Bitconnect promised 40% monthly returns from a fictitious trading bot before collapsing in January 2018, wiping out $2.5 billion in investor funds. At its peak, the token ranked among the top 20 cryptocurrencies by market cap, fueled by viral marketing like Carlos Matos' infamous "Hey hey hey!" pitch. The promised 40% monthly return is 80 percentage points higher than Charles Ponzi's 50% return over 45 days — a mathematically unsustainable gap that made the crash predictable.