# Making a deposit

In order to make a deposit first approve a compatible stablecoin allowance for the exchange on the amount you wish to deposit, then call the exchange's `depositTokens` function:

```
ERC20 stablecoin = ERC20(0x123...);
OptionsExchange exchange = OptionsExchange(0xABC...);

address to = 0x456...;
uint value = 100e18;
stablecoin.approve(address(exchange), value);
exchange.depositTokens(to, address(stablecoin), value);
```

*Obs: An* [*EIP-2612 compatible*](https://eips.ethereum.org/EIPS/eip-2612) *`depositTokens` function is also provided for deposit functions in a single transaction.*

After the operation completes check total exchange balance for an address using the `balanceOf` function:

```
address owner = 0x456...;
uint balance = exchange.balanceOf(owner);
```

Balance is returned in dollars considering 18 decimal places.

In case you wish to withdraw funds (ex: profits from an operation) call the `withdrawTokens` function:

```
uint value = 50e18;
exchange.withdrawTokens(value);
```

The function will transfer stablecoin tokens to the `msg.sender` for the requested amount, provided that the caller has enough unallocated balance. Since the exchange accepts multiple stablecoins the withdrawer should expect to receive any of these tokens.

*Obs: If there aren't enough stablecoins available in the exchange the solicitant will receive ERC20 credit tokens issued by the credit provider contract which can later be redeemed for stablecoins at a 1:1 value conversion ratio.*

<br>


---

# Agent Instructions: Querying This Documentation

If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter:

```
GET https://docs.defioptions.org/coding-reference/making-a-deposit.md?ask=<question>
```

The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.