What coin is the highest dollar amount made?

If you mean American Dollar, that would be the Golden Dollar.

However, there is several variables to that answer, e.g. whether you want another currency, whether you meant in circulation or uncirculated, or in current production vs. ever minted.

More about US coinsThe highest-denomination US coin ever struck for general use was the "double eagle", or $20 coin. It was issued from 1849 to 1933. They were made of 90% gold and 10% copper. The first and last (1849 and 1933) issues are extraordinarily rare and are among the most valuable of all US Coins.

Various commemorative $50 gold coins were struck for sale to collectors. These were also called "quintuple eagles" and "half-unions". In addition, a $100 coin (a "union") was proposed and designed in the late 19th century, but was never struck.