FTX offers a variety of channels where you can subscribe to get real-time updates of market data, orders...
Find below a sample of how subscribe to a Ticker:
oClient := TsgcWebSocketClient.Create(nil);
oFTX := TsgcWSAPI_FTX.Create(nil);
oFTX.Client := oClient;
oFTX.SubscribeTicker('BTC-PERP');
procedure OnFTXMessage(Sender: TObject; aType, aRawMessage: string);
begin
// here you will receive the ticker updates
end;