
DIO is the in game currency for Decimated. It is used to purchase in-game items such as vehicles, weapons, character customizations and consumables such as food, water, ammo and fuel. DIO will also be rewarded for completing missions in Decimated, enabling play-to-earn mechanics.
It is possible to buy DIO prior to the official launch of the game.
Here is where DIO can be purchased:

Raydium.io
Raydium is an automated market maker (AMM) and liquidity provider built on the Solana blockchain for the Serum decentralized exchange (DEX). Raydium has a first-mover advantage as an AMM within Serum and will be an integral part of bringing new and existing projects and protocols into the ecosystem.
The direct link to buy DIO with USDT is: https://bit.ly/DIO_Raydium2
Simply connect your Solana wallet (Phantom, Solflare, Sollet, etc), make sure you have USDT to buy DIO and Solana to pay for the transaction fee. Here is a simply tutorial:

Huobi
Huobi.com is the world-leading Bitcoin and Ethereum trading platform, providing secure and convenient trading services for hundreds of digital assets. Users can register and download the Huobi Global app on Huobi.com.
The direct link to buy DIO on Huobi is https://bit.ly/DIO_Huobi

Gate.io
Gate.io allows users to easily exchange BTC, ETH, EOS and hundreds of high-quality cryptos with leverage and ETFs Copy Trading Gate.io provides a variety of quantitative strategies. You can also copy the strategy of the top earners on the Leaderboard.
The direct link to buy DIO on Gate is https://bit.ly/DIO_Gateio
Here is a quick video tutorial: