VTHO rewards are distributed to VET wallet holders , without any transactions on the blockchain. Other blockchains often have a daily, or monthly airdrop/reward transaction. The Vechain wallet API doesn't handle VTHO aggregation, and it's pretty difficult to calculate the price at time of receiving, because it's literally constantly being added to your wallet without a transaction. Please update the API to handle VTHO aggregation, along with its market price averaging, for native Vechain wallets.