Yes, you can buy and sell YFI on dexs without needing to do any OTC deals. However, it is important to be aware that there are scammers out there who may try to take advantage of people who are not familiar with the process. It is recommended that you do your research and be aware of any potential risks before engaging in any OTC deals. Additionally, if you are ever in doubt, it is best to reach out to a trusted source, such as a friend or family member, for advice before making any decisions.