How to Sell Ontology Gas (ONG) for Cardano (ADA) in Portugal

To sell Ontology Gas for Cardano in Portugal, first, find a cryptocurrency exchange that supports the ONG/ADA trading pair. Create an account, verify your identity, and deposit your ONG into your exchange wallet. Locate the ONG/ADA pair on the trading platform and place a sell order to exchange your Ontology Gas for Cardano. If the ONG/ADA pair is unavailable, you can first sell Ontology Gas for a stablecoin like Tether (USDT) or a fiat currency such as the Euro, then trade that for Cardano. Be mindful of potential exchange fees, which vary by platform and can affect the total amount you receive.