Which crypto has the most limited supply?

I'm curious to know, among all the cryptocurrencies available in the market, which one boasts the most restricted or limited supply? This characteristic is often seen as a factor that can potentially influence the value and demand for a particular crypto asset, so it's quite intriguing to understand which one holds the tightest reins on its supply. Is there a specific cryptocurrency that stands out in this regard, and if so, what are the underlying reasons for its limited supply?