The inflation rate for TON is not fixed and may vary depending on various factors such as network activity and the number of validators.
According to the TON whitepaper,
the initial inflation rate was set at 0.6% per year, which is distributed among the validators as a reward for validating transactions and maintaining the network.
However, it's important to note that the inflation rate for TON may not be directly tied to the circulating supply or the initialized account balances. Instead, it may be based on the amount of TON being staked by validators, which can change over time.
It's also worth mentioning that TON was not launched due to regulatory issues, so there is no active TON network.
For me, I will use http://Tonstake.com and track the data.