# Swapping WETH / NIL
First step is to go to and click on Launch App.
You will see a screen like this one.
If you are looking to buy NIL. Select WETH or ETH in the top pull down so you can swap your WETH or ETH for NIL.
After you select WETH or ETH, you click on Select a Token on the bottom pull down menu. Since NIL is not in your list (yet) - you need to Past the Contract Address in to the form to load the NIL Token.
{% hint style="info" %}
The Contract Address is **0x0eb638648207d00b9025684d13b1cb53806debe4**
{% endhint %}
Once you past the Contract Address - **0xD31B00deA80cF282aCE1791D204d76a85Fb82556** - into the field, you will see NIL show up as an option. Click on the NIL option.
The next step once you have the two fields ready is to put the amount you want to swap. And then click SWAP. You will see a popup like below to confirm the swap.
### Set Slippage Tolerance to 18%
After you confirm the swap, it will load your Metamask (ERC 20) wallet and finalize the swap.
---
# 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://doortoken.gitbook.io/nil-help/how-to-buy-sell-nil/swapping-weth-nil.md?ask=
```
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.