> ## Documentation Index
> Fetch the complete documentation index at: https://docs.marks.finance/llms.txt
> Use this file to discover all available pages before exploring further.

# Funding & Withdrawals

> How your account's USDC balance is funded and withdrawn.

Your account holds a USDC balance that backs every Hedge: margin and fees are drawn from it when you open, and returned to it when you close or settle. Funding and withdrawals are handled on the partner desk today - there is no funding or withdrawal API endpoint.

## Your balance

`GET /account` shows your balance and how much of it is committed:

* `balance_usdc` - free, spendable USDC.
* `margin_used_usdc` - collateral locked across open Hedges.
* `available_exposure_usd` - how much more notional you can open under your cap.

See [Monitor positions](/guides/monitor-positions) for the full account payload.

## Funding your account

Fund your account by sending USDC to your account address. Your address is returned as `account_address` on `GET /account`, and is shown on the desk. Deposits credit your `balance_usdc` once confirmed on-chain.

<Warning>
  Send only USDC, on the network shown on the desk, to your account address. Sending another asset or using another network can result in lost funds.
</Warning>

## Withdrawals

Withdrawals are initiated from the desk: you request an amount and it's returned in USDC to your destination address. There is no withdrawal API endpoint today. You can withdraw any free balance that isn't locked as margin for an open Hedge.

## Sandbox

Sandbox accounts come pre-funded with test USDC, so you can open and settle Hedges end to end without moving real money. Balances are separate from production. See [Sandbox](/guides/sandbox).