Some changes are being made to the APIs currently, but the resulting APIs will always be backwards compatible with old applications.


The supply is infinite to incentivize miners securing the network forever. However the block reward is smaller over time and it will reach a minimum of 30KS/block. The inflation, for that reason, will be smaller and smaller. For instance, inflation rate today is 23% but it will be 3-4% in 2020. You can check the numbers here: https://siastats.info/supply_inflation.html

Also consider that in a future update Proof of Burn mechanics will be introduced for hosts to prove their legitimacy. So the more network usage, more burnt coins. At some point, if the network is big enough, the coin could be deflationary. Also, millions (or billions) will be locked in file contracts as the network keeps growing