# Let's Swap

**Always practice solid risk management rules when experimenting with swaps: use the correct slippage values and trusted currency pairs, double-check the numbers before confirming, and compare external price sources.**

Throughout this guide, we will use [Router](/smart-contracts.md#router) and try to swap Aptos coins to test BTC.

Let's create a new module and import the router into it:

{% embed url="<https://gist.github.com/borispovod/62ba3b63a335267221922db3eaa05891>" %}
Basic module
{% endembed %}

As you try to compile the code above, you will get a warning; don't worry, it's fine.&#x20;

Now let's add the dependencies we will need for this experiment, as well as a basic entry function that we can call in a transaction later:

{% embed url="<https://gist.github.com/borispovod/1a1ec9b2ae21c0e0d75775f4fd9e6ecd>" %}

Let's withdraw `1000` Aptos coins from an account and see how many BTC we can get in exchange:

{% embed url="<https://gist.github.com/borispovod/c0d434a0c944009d83e18b2b7187b98f>" %}

The provided code above wouldn't still compile as we can't drop Aptos coins; at the same time, it already shows how much BTC we can get back for 1000 Aptos coins because of `get_amount_out` function.

Now let's indeed do a swap and finally deposit the swapped coins on our account:

{% embed url="<https://gist.github.com/borispovod/019a3b99214845278d2339bef40aaf2c>" %}

Everything worked out well; using `swap_exact_coin_for_coin,` we have swapped Aptos coins for BTC.

This looks simple, but what if someone decided to front-run us? Let's add some basic slippage checks for the minimum amount of BTC we want to receive (afterwards we can remove `get_amount_out`).

{% embed url="<https://gist.github.com/borispovod/871dfeddbffba5396e5a605a46d7ef9c>" %}

All done. In the same way, you can try another function: `router::swap_coin_for_exact_coin` (see [Router](/smart-contracts.md#router) docs).

*An important note regarding decentralized AMM securities and user transactions:*

* *Always use safety checks.*
* *Never swap tokens without a slippage value provided offline.*
* *Use external price feeds or oracles (even the* [*Basic Oracle*](/integration/basic-oracle.md) *can be a good option).*


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