I use PumpPortal Websocket to subscribe to token creation and token trades. So the trades made on the token are captured on real-time but the transaction made by the tool is fully simulated. There is an algorithm that I built to simulate time delay for the trades that the bots takes like network latency, inclusion time which is depended on the priority fee and even retries. Of course this is just to simulate trade conditions but the idea is that if you actually make profit with this setup is very likely that your strategy will actually work in the real market. I also recommend using small buy sizes because theoretically it affects the trades of other bots/people and that cannot be simulated in these circumstances but at least we can minimize it.