What Happens When a Cryptocurrency Reaches Its Maximum Supply?

When a cryptocurrency reaches its maximum supply, no new coins can be created under its current rules. The blockchain does not stop. Existing coins keep trading, and miners or validators can still earn rewards from transaction fees or other methods. Bitcoin is the best-known case. Its supply is capped at about 21 million coins. The last fractions are expected to be mined around 2140. Other networks work differently. Cardano (ADA) has a cap of 45 billion tokens, and XRP created all 100 billion of its coins at launch.