Sidechain: xDAI

xDAI is a POSDAO consensus sidechain of Ethereum with native currency of xDAI instead of GAS (ETH) to use for onchain transaction.

Website:
https://www.xdaichain.com/

Blockexplore:
https://blockscout.com/poa/xdai/

TokenBridge (DAI to xDAI): 
https://docs.tokenbridge.net/xdai-bridge/about

How to use:
1: Setup wallet 
Here are screenshots and links of wallets.
Metamask setup with RPC
Please follow the instruction below
https://www.xdaichain.com/for-users/wallets/metamask/metamask-setup

or
​
Use Nifty wallet which is native xDAI wallet.
https://chrome.google.com/webstore/detail/nifty-wallet/jbdaocneiiinmjbjlgalhcelgbejmnid/related?hl=en

2: Get xDAI
Use xDAI xbridge to convert DAI to xDAI.
​https://bridge.xdaichain.com/

I connected both metamask and Nifty wallet and the website automatically chose Nifty wallet to connect as of 31/Oct/2020. 

3: Stake "Stake"
It is recommenced too use easy-staking by xDAI website.
https://easy-staking.xdaichain.com/

Scheduled withdrawal take 12 hours to withdraw with 0% fee. 

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There is also stake Beta version function on Blockscout which needs "STAKE" token on xDAI chain. Easy-staking is using "STAKE" on mainnet.