Binance , Kraken , MEXC , KuCoin, Gate.io .

Several centralized and decentralized exchanges support ADX:

Deposit USD, EUR, or USDT on a CEX like Kraken or Binance. Locate the trading pair: Search for ADX/USDT or ADX/USD .

Place a market or limit order to purchase ADX. How to Buy AdEx Token (ADX): Step-by-Step Guide - MetaMask

ADX is used for staking, network governance, paying for ad campaigns (at reduced fees), and securing the network.