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

# Deposit and withdraw

> Move between underlying assets and Overpass yield tokens.

Deposits and withdrawals are the main user actions for an Overpass yield token.

## Deposit

A deposit supplies the underlying asset to the source pool and mints the yield token.

```ts theme={null}
import { buildOverpassSwap } from "@symmetry-hq/overpass";

const built = await buildOverpassSwap(connection, {
  user: wallet.publicKey,
  wrapperMint,
  amount,
  direction: "deposit",
  minOut,
});
```

Deposit output depends on:

* source-pool accounting
* wrapper NAV
* protocol deposit fee
* creator deposit fee
* source-pool cap and pause state

## Withdraw

A withdrawal burns the yield token and redeems the underlying asset.

```ts theme={null}
const built = await buildOverpassSwap(connection, {
  user: wallet.publicKey,
  wrapperMint,
  amount,
  direction: "withdraw",
  minOut,
});
```

Withdrawal output depends on:

* source-pool exchange rate
* withdrawal liquidity
* utilization
* source-pool health
* protocol-specific redemption constraints

## Exact-in behavior

The SDK currently exposes exact-in swaps. You provide the input amount, and Overpass returns the expected output amount through quoting and transaction building.

Use `minOut` to enforce the minimum acceptable output.

## Balance checks

Applications should check the user's token balance before building a transaction:

* for deposits, check the underlying token balance
* for withdrawals, check the yield-token balance

Do not attempt to spend wrapped SOL rent reserves or non-spendable balances.

## Transaction building

`buildOverpassSwap` returns a built instruction bundle that can include:

* instructions
* lookup tables
* suggested compute units

Use those values when composing a versioned transaction, especially when combining Overpass with aggregator swap legs.

## When to block a transaction

Block or warn before sending if:

* the quote returns blocking warnings
* the user balance is insufficient
* the requested amount is below the source minimum
* deposits are paused
* the pool is at capacity
* withdrawal liquidity is unavailable
* the source oracle is stale

If a route includes a swap leg, also validate slippage and minimum output for that leg.