# Swap Modes

City Protocol's swap client supports multiple execution modes that reflect different user intents and execution guarantees:

{% tabs %}
{% tab title="exactIn Mode" %} <mark style="color:$primary;">**exactIn Mode:**</mark>&#x20;

The user specifies an exact input amount, and the aggregator returns the best achievable output for that input under the given slippage tolerance.
{% endtab %}

{% tab title="exactOut Mode" %} <mark style="color:$primary;">**exactOut Mode**</mark>

The user specifies an exact desired output amount, and the aggregator calculates the required input needed to meet it.
{% endtab %}

{% tab title="MEV-Protected Swaps" %} <mark style="color:$primary;">**MEV-Protected Swaps**</mark>

Available on Solana through the optional `jitoUnsignedTx` field in the execution response, enabling bundled transaction submission via Jito's block-building infrastructure for protection against sandwich attacks and front-running.
{% endtab %}
{% endtabs %}


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