How to get the balance of TRC20 tokens on the account without using TronGrid?

Question

Cryptocurrency

Hello. Cryptons, a question for you. It is necessary to request the balance of TRC20 tokens at the account address, and the deployed Tron node gives only TRC10. Through long clarifications, it turned out that in addition to the node, there is also an eventServer (eventron), the sources of which are naturally not provided by the developers, the repo is closed. But on the other hand, they sell access to their own, read, exclusive way to get everything related to TRC20 (transactions, balances, etc.), that is, they have deployed a shareware API so far. This option is not very suitable for us, because. I would not like to rely on my decision, which is independent of other companies. Maybe someone has already done something similar, advice would be very useful at least in what direction to dig.