# Step 1: Transition Bridge

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Only if you have ATS coins on ARTIS ∑1, you have to do this step. 
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When transferring coins / tokens over bridges, you need to make sure that you can access the used account address on the recipient blockchain. The simplest way is by using wallets which support both chains, so that you can see the token on the other chain right away. Recommended wallets are: 

* [Metamask](https://docs.artis.eco/about/wallets#metamask) (Browser, Android & iOS)
* [AlphaWallet](https://docs.artis.eco/about/wallets#alphawallet) (Android & iOS)
* [MyCrypto](https://docs.artis.eco/about/wallets#mycrypto-desktop) (Desktop)

### **Send ATS from ARTIS ∑1 to xDai Chain**

You have to send your ATS coins via a **mediator contract** to the xDai Chain and there you will get the xATS\_tmp (ERC20) tokens. This xATS\_tmp tokens will be received on the same address on the xDai Chain. 

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* Minimum transfer amount: 10 ATS
* Gas Limit: min. 200,000 GWei

Check your gas settings for Metamask to be correct, before confirming the transaction. 
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Send the desired **ATS coin** amount to the mediator contract at: `0x0b683eB188F83FA7a3243282e5d384eb4f1c3408`

![ATS --> xATS\_tmp Mediator Contract](https://598102864-files.gitbook.io/~/files/v0/b/gitbook-legacy-files/o/assets%2F-MJ6XK28t44RFy_Rkkty%2F-MUrG5R2R3nIoBEDfPgL%2F-MUri2hTTgImBJ4KRIGx%2Fimage.png?alt=media\&token=f3d0c655-660b-4b17-aff5-6fd4cd6271cc)

The contract can be found via the ARTIS ∑1 blockchain explorer ([here](https://explorer.sigma1.artis.network/address/0x0b683eB188F83FA7a3243282e5d384eb4f1c3408/transactions)) and is available on Github ([here](https://github.com/lab10-coop/artis-bridge-contracts)). 

### Receive xATS\_tmp on xDai Chain

On the xDai Chain you receive xATS\_tmp token in the same amount as you have sent to the mediator contract. 

In Alphawallet you should see the xATS\_tmp token automatically, but for Metamask and MyCrypto you will have to add the token to make it visible in your wallet.

The xATS\_tmp token contract address to add the token to the wallet is: `0x49d2BB4A247E38b817E9404246DBc48Ca6707831`

The xATS\_tmp token contract can be found via the xDai Chain blockchain explorer ([here](https://blockscout.com/poa/xdai/address/0x49d2BB4A247E38b817E9404246DBc48Ca6707831/transactions)).

Additionally every account will get 0.01 xDai to pay for transaction fees.