§6) Account trading
It is not allowed to play accounts for commercial purposes. It is not allowed to sell, buy or offer accounts or parts of accounts in exchange for Premium points or any other outside benefit. Trades involving more than one game world are also forbidden.
Examples:
Offering to sell or buy accounts or parts of accounts (including troops, resources or villages) is forbidden.
It is forbidden to offer resources for money or premium points.
It is forbidden to offer or accept premium points for any in game service such as spying on another tribe.
It is allowed to offer your army in exchange for resources on the same world.
It is forbidden to offer money or premium points as a reward for attacks, supports or resource transports to any player, or to ask for payment in return for those services. A reward cannot be offered for anything that might incite attacks or any actions against other players (for example, contests to see who can gain the most opponents defeated score).
It is forbidden to blackmail other players for premium points.
Offering premium points for external resources (such as scripts, graphic packs) is permitted.
If you are unsure about whether a contest is allowed, you should always submit a support ticket first.