# Swap

A **swap** is the process of exchanging one Stellar asset for another using liquidity from Soroban-based [**Automated Market Makers (AMMs**](/additional-resources/01-concepts/amm.md)**)**. Swaps can be executed directly through the [**Soroswap AMM** ](https://docs.soroswap.finance/01-protocol-overview)or routed via the [**Aggregator**,](https://docs.soroswap.finance/01-concepts/aggregator) which optimally resolves the operation by finding the **best available price at the time** through an **intelligent distribution** across supported AMMs.\
\
👉🏽 [How to Swap](https://docs.soroswap.finance/readme/getting-started/how-to-swap)\
Follow the [Swap Tutorial](https://docs.soroswap.finance/05-tutorial/05-doing-swap)

<figure><img src="/files/lMYnmSmUv8F7OKxarmv7" alt=""><figcaption></figcaption></figure>

### How does a swap work?

**User selects two assets** – one to sell and one to receive.

1. **Input amount is defined** – the app estimates the output based on current pool conditions.
2. **Router SDK scans available pools** – if the Aggregator is enabled, it calculates the best distribution **`DexDistribution`**.
3. **User confirms the swap** – the smart contract receives the input asset and performs the swap.
4. **User receives the new asset** – if it's the first time, a **trustline** must be signed to accept the asset.

### 📐 Constant Product Formula

Each AMM in Soroswap follows this formula:

```
x * y = k
```

Where:

* `x` = balance of asset A
* `y` = balance of asset B
* `k` = constant product (remains unchanged)

When someone swaps A for B:

* A is deposited into the pool
* B is withdrawn
* The price updates to maintain the balance

This model ensures continuous liquidity.

🔜 **Next:** [Fees](https://docs.soroswap.finance/01-concepts/01-fees)\
🔙 **Previous:** [Liquidity Pools](https://docs.soroswap.finance/01-concepts/02-pools)


---

# 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.soroswap.finance/additional-resources/01-concepts/swap.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.