On April 9, 2025, Donald Trump told his Truth Social followers that it was “a great time to buy,” then announced a 90-day pause on many of his new tariffs a few hours later. The S&P 500 finished the day 9.5% higher, Bitcoin gained more than 5%, and crypto traders holding short positions lost $374 million as markets repriced a policy change delivered through the president’s social-media account.The chain of events drew calls for an investigation into whether anyone had traded with advance knowledge, but it also revealed a deceptively simple but potentially very lucrative commercial opportunity. When one account…