# Launch your Chainlet on Testnet

**Prerequisites**: [request tokens](https://docs.saga.xyz/saga-web-app/account-management/requesting-tokens-from-saga-faucet)

{% hint style="warning" %}
All chainlets launched will require a setup fee and a **30-day** upfront deposit of the epoch fee

Please ensure you have sufficient funds available in the launcher's wallet to successfully launch a chainlet

See [Chainlet Billing](https://docs.saga.xyz/saga-web-app/working-with-chainlet/chainlet-billing) for details
{% endhint %}

{% hint style="info" %}
Saga Web App is now online at <https://testnet.app.saga.xyz/>

You will need a wallet, such as [Keplr](https://www.keplr.app/), that supports Cosmos SDK based blockchains\
If this is your first time using Keplr Wallet, follow this [tutorial](https://help.keplr.app/articles/installation-guide-for-keplr-extension-for-beginners) to install and start using it.
{% endhint %}

To launch a chainlet, simply click on the `Launch` tab on the Saga Web App.

<figure><img src="https://2275213946-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FVcvucDjYgfpsmWLerOCi%2Fuploads%2FMvBWxuPBApey98U4Ifxo%2FScreenshot%20from%202023-12-13%2013-28-20.png?alt=media&#x26;token=323e5c4a-7c97-42df-9054-56f9cee737c2" alt=""><figcaption></figcaption></figure>

In the example displayed in the image above, we are launching a chainlet called `SagaWebAppTst`. You can specify&#x20;

* Chainlet token's denom
* Number of days of credit (note that this must be a value greater than or equal to the minimum value) you wish to add to the chainlet
* EVM account address
* Amount of tokens to add to the EVM account at genesis (launch of the chainlet)

To add additional EVM accounts and their associated token amount at chainlet launch, simply click the **+** sign next to the EVM token amount.

When you are done, simply click `Launch Chainlet`

<figure><img src="https://2275213946-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FVcvucDjYgfpsmWLerOCi%2Fuploads%2FR9G6XSEJ4WAkpkzp9vdb%2FScreenshot%20from%202023-12-13%2013-28-40.png?alt=media&#x26;token=17499b68-1e22-42e6-a5bc-0593a8566c14" alt=""><figcaption></figcaption></figure>

You will get a prompt from the Keplr wallet to approve this transaction. Click Approve and the chainlet is launched!

<figure><img src="https://2275213946-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FVcvucDjYgfpsmWLerOCi%2Fuploads%2FaaoI6UFmLiDMyXcqojXf%2FScreenshot%20from%202023-12-13%2014-57-15.png?alt=media&#x26;token=889711c4-3f22-40c7-bccb-bcf97825bb81" alt=""><figcaption></figcaption></figure>

#### Launching with Advanced Options

You can turn on advanced launch option for launching chainlet by clicking on the `Settings` icon on the launch chainlet screen

<figure><img src="https://2275213946-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FVcvucDjYgfpsmWLerOCi%2Fuploads%2FReG4OBNyicuRnHf9ZdW1%2FScreenshot%20from%202023-12-13%2014-59-21.png?alt=media&#x26;token=f3fe22f7-c90f-4f95-9dd4-b70bfade9322" alt=""><figcaption></figcaption></figure>

Simply use the toggle switch to turn on **advanced launch options**.

<figure><img src="https://2275213946-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FVcvucDjYgfpsmWLerOCi%2Fuploads%2FGgFIksawyBW3J3BdcNHL%2FScreenshot%20from%202023-12-13%2015-01-49.png?alt=media&#x26;token=e44b03c4-019f-435b-9844-830179b7ac7d" alt=""><figcaption></figcaption></figure>

In the image above, turning on advanced launch options enables me to specify a [fee return account](https://docs.saga.xyz/sagacli/working-with-chainlet/launch-your-chainlet-on-testnet#example-launching-a-chainlet-using-the-fee-account-flag), and also turn on/off the [base gas fee](https://docs.saga.xyz/sagacli/working-with-chainlet/launch-your-chainlet-on-testnet#example-launching-a-chainlet-using-the-base-gas-fee-flag) switch.

<figure><img src="https://2275213946-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FVcvucDjYgfpsmWLerOCi%2Fuploads%2F9mnjmiinbmTUjIuWVg94%2FScreenshot%20from%202023-12-13%2015-08-44.png?alt=media&#x26;token=0aca72ed-a0f5-4433-9d39-30c1174b79b1" alt=""><figcaption></figcaption></figure>

In the image above, turning on the `base gas fee` switch enables me to specify a base gas fee value.

Below, you can see an example of a chainlet launched using these advanced options.

<figure><img src="https://2275213946-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FVcvucDjYgfpsmWLerOCi%2Fuploads%2FyiBQadgTrkfD2Ohs5Y0e%2FScreenshot%20from%202023-12-13%2013-23-08.png?alt=media&#x26;token=695f815c-f677-4a97-b931-0fcaaa3b2d1a" alt=""><figcaption></figcaption></figure>

For more details about this feature, you can check also:

* [Stack Exploder: Unblocking Web3 Products With Costless Transactions](https://medium.com/sagaxyz/stack-exploder-unblocking-web3-products-with-costless-transactions-387b9f03b7c5)
* [Stack Exploder: Implementing Costless Transactions Using Recycled Gas Tokens](https://medium.com/sagaxyz/stack-exploder-implementing-costless-transactions-using-recycled-gas-tokens-ee51548b390e)