# Pref Swaps

## Pref Swap & Tokens

**Pref Swap** is one of the most powerful features of WFN V2. It allows you to automatically trade your earned rewards for other tokens on the Waves blockchain

### How it Works

When the WFN V2 engine processes your rewards, it checks your on-chain preferences. If you have specified a "Target Token," the system will automatically route your rewards through a Decentralized Exchange (DEX) to swap them before sending them to your wallet

#### Supported Swaps

You can set up to 3 token pairs for your rewards:

1. **WAVES** → Your Target Token (e.g., USDT, WX)
2. **LP Tokens** → Your Target Token (e.g., WAVES)
3. **UNIT Tokens** → Your Target Token (e.g., WAVES)

#### Personalized DEX Selection

At WFN, we believe in full control. While our system defaults to a smart routing approach to find you the best rate, **each user and project owner has the right to choose exactly which exchange their tokens are swapped through**

If you have a preference for a specific platform's liquidity or features, you can customize your settings to prioritize:

* **Puzzle Swap:** Our primary aggregator for the best overall rates across the ecosystem.
* **WX.Network:** For deep liquidity and native Waves ecosystem tokens
* **Swop.Fi:** For efficient automated market making and specific token pairs

#### Slippage & Fallback

* **Slippage Tolerance:** We use a 1% slippage tolerance by default to protect your trades from sudden price swings

{% hint style="warning" %}
**Disclaimer:** WFN does not guarantee specific exchange rates or price impacts for any swaps. While we monitor the system to ensure it functions correctly, we do not take responsibility for market-driven fluctuations in rates or liquidity on the DEXes
{% endhint %}

* **Automatic Retries:** If a swap fails during a processing cycle (e.g., due to temporary network congestion or price spikes), the system doesn't give up. It will **automatically retry the swap in the next cycle**
* **Fallback Exchange:** If a swap fails on your primary chosen DEX, our system can automatically attempt to route the swap through a **fallback exchange** (like Puzzle Swap) to ensure the trade is completed
* **Final Reward Fallback:** If the error persists after multiple retries or if the volatility remains too high, the system will eventually fallback to sending you the **original reward token** (e.g., sending you WAVES instead of the USDT you wanted). This is a safety measure to ensure you **never lose your rewards**