Settlements in nations and nations now get daily activity credits for active (logged in within 3 days ago) members. For settlements, this is 10 credits per player, and for nations, 100 credits. This is given daily at 1 AM UTC (this time may change). Funds are deposited into nation/settlement balance.
This encourages nations and settlements to recruit new members, and encourages settlements who aren't in nations to join nations so they get money.