No, it is against the Terms of Service (ToS) of Clash of Clans (CoC) to sell or purchase accounts. According to the ToS, all accounts in CoC are the property of Supercell, the developer of CoC, and are non-transferable. If you violate this rule, your account can be permanently banned. Instead, players are encouraged to build and develop their accounts through regular gameplay to gain a competitive edge. Moreover, buying an account undermines the integrity of the game and provides unfair advantage to the players who do not use such tactics. Therefore, it is recommended to refrain from selling or buying accounts in CoC.