> For the complete documentation index, see [llms.txt](https://docs.affyn.com/en/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.affyn.com/en/all-about-usdfyn/setup-metamask/guide-to-buy-usdfyn-on-metamask.md).
# Guide to buy $FYN on MetaMask
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Transactions taking place on the Polygon blockchain require payment of MATIC (Polygon network) as gas fees. Users are recommended to **prepare at least 1 MATIC** in their wallet.
{% endhint %}
{% hint style="info" %}
Actual UI may differ due to updates.
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**Step 1:** Open the MetaMask mobile application. Check that you are connected to **Polygon Mainnet**
**Step 2:** Select the "Double Arrows" icon
**Step 3:** Select `Swap`
**Step 4:** Click on `Select a token`
**Step 5:** Enter `Fyn` in the search box, then select `Affyn`
**Step 6:** You should see FYN populated in the bottom box. Select the **box on top**
**Step 7:** Search for the token that you are using to swap to $FYN. In this example we will be using USDC
{% hint style="info" %}
Ensure that the tokens you are using for the swap are on the Polygon blockchain
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**Step 8:** Key in the amount of tokens that you want to swap to FYN using the number input panel. In this example, we will be using 5000 USDC
**Step 9:** Select `Get quotes`
**Step 10:** Wait for MetaMask to finish fetching quotes
**Step 11:** Select `I understand`
**Step 12:** If you are happy with the quote, **swipe** the white button to the right
**Step 13:** Wait for MetaMask to complete the transaction
**Step 14:** Congratulations! The swap is now complete. You can select the "Transaction History" icon to view your transaction history
