CoinGecko is not an exchange or wallet service and we do not provide cryptocurrency buy/sell services. We are a cryptocurrency data aggregator and only provide trading information from the various cryptocurrency exchanges worldwide.

To buy/sell a particular cryptocurrency, you may look at the exchanges selling it and head to the exchange website directly.

For example, you may buy/sell Terra from the list of exchanges listed here:

You can also look at the list of all crypto exchanges tracked on CoinGecko here.