Mr. Trump's meme coin soared after it debuted, hitting a peak of almost $75 each. But the price has shed about 45% of its value since then, settling at about $40 per coin on Monday afternoon ...

Meme coins are often produced as a joke. But some have ballooned to enormous valuations, with liquid markets, celebrity endorsements and multibillion-dollar market caps.

In the up-and-down world of cryptocurrency, so-called meme coins are perhaps the most bewildering. The joke-inspired digital currency is all over the internet with new tokens popping up every day ...