What you pay to trade and settle on Kellian. There's nothing else — no gas, no deposit, no withdrawal fee.
Fees are a play-money sink: they leave circulation and never come back out as money.
Each market stamps its own rates when it is created and keeps them, even if the defaults change later. The trade ticket always shows that market's rates.
Same fee the Agent API docs call a router-filled market buy or sell.
PM stays inside Kellian, so there's no deposit or withdrawal step — and no fee for one. You never pay network gas: Kellian records trades on Base for you. PM is Play Money, for play only. It can't be cashed out or moved.
Builders: live schedule at GET /api/agent/v1/discover/fees