> For the complete documentation index, see [llms.txt](https://docs.zeta.markets/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.zeta.markets/zeta-protocol/exchange-architecture/margin-accounts.md).

# Margin Accounts

The margin account is the sole account that tracks all of a user's state across the exchange. There is one account, called a CrossMarginAccount, for all assets. That means you only have to deposit/withdraw once to have access to all markets.

This account stores all the necessary details for the user state bookkeeping including:

* Balance
* Open orders
* Positions
* Cost of trades
* Trading fees
* Funding payments

For a more detailed overview, have a look at the [SDK documentation](/build-with-zeta/sdks/typescript-sdk.md) which discusses the account structure in more depth.

A user margin account is atomically created on deposit of USDC to the platform. There is a one time cost of \~0.01 SOL, returned when an account is closed.


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