You can use this simple dashboard on Dune Analytics to obtain and track onchain balances of any SPL token in a hassle free way, you just need the Token mint address and the token account you want to track.

You can find it here https://dune.com/crypto_notte/solana-spl-token-historical-balance

Dashboard for tracking historical balances

To use the dashboard and run your custom analysis you will need the SPL token mint address and the token account you want to monitor, pay attention that the token account is NOT the main wallet.

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