xDai Chain Official Announcement


Oct 18, 2018

POA Network has launched the first ever blockchain where the native currency of the chain is USD-stable. xDai Chain, an Ethereum compatible sidechain with Dai as the native currency of the network, combines POA Network’s interoperability knowledge and technology with MakerDAO’s Dai, the permissionless, crypto-collateralized USD-stable coin.

xDai Chain has the support of all the tools of the Ethereum ecosystem, including mobile and hardware wallets, blockchain explorers like BlockScout, and libraries of smart contracts. We think that a platform for smart contracts with Dai as the native currency will open unlimited new possibilities for many use cases, such as micropayments, lending, insurance, and overall developer experience.

With xDai Chain, POA created a full t ool kit for DApp developers looking to improve the end user experience by allowing people to transact with high scalability and pay gas fees in a single token ,” said Rune Christensen, CEO and co founder of MakerDAO. “xDai Chain creates an awesome opportunity for developers to launch DApps with Dai as the medium of exchange.”

POA Network’s expertise with sidechains to Ethereum and interoperability between networks created the Token Bridge between POA Network and Ethereum which was launched into production in May 2018 and has been operational since then, with over 33 million POA transformed.

POA recently built a new type of the Token Bridge (“ERC20 <-> Native”) where locked ERC20 tokens on Ethereum network will mint native tokens on a new empty (“hard spoon”) sidechain launched with no emission or premine.

“xDai Chain provides an exciting and new platform for the community and DApp developers. The premise of a stable coin based blockchain opens up endless possibilities for developers and applications” said Igor Barinov, Tech Lead of POA Network. “Using the different tools POA Network has created, users can bridge their Dai to the new xDai Chain and start using a single token for their transactions while making use of the benefits of a PoA based sidechain”

On xDai Chain, the native coin will be referred to as XDAI, resulting in transaction fees being fixed in Dai, or USD effectively. This new blockchain will leverage POA Network’s technology allowing it to be fast, scalable, and cost-efficient. A five second block generation time will result in transaction speeds of 60 tx/s. With gas costs as low as 1 Gwei per transaction, 500 transactions on the xDai chain will cost less than 1 cent.

For the first time ever, developers can now have known gas costs fixed in USD terms. This gives all xDai Chain users and developers more certainty around the USD cost of using an Ethereum-based blockchain.

What is xDai Chain?

xDai Chain is an Ethereum-based blockchain that uses USD-stable XDAI (a representation of DAI token) as the native coin of the network. xDai Chain will be fast and cost efficient, using Proof-of-Authority consensus model and having 5 second block times.

What is XDAI?

XDAI is the USD-stable coin that is a representation of DAI but lives on xDai Chain, instead of Ethereum mainnet. XDAI is the native coin on xDai Chain and is used as the currency and for transaction fees on the network.

How do I connect to xDai Chain?

  • JSON RPC Endpoint to connect to xDai Chain from Metamaskhttps://dai.poa.network

  • BlockScout , a blockchain explorer for xDai Chainhttps://blockscout.com/poa/dai

  • TokenBridge to convert Dai from Ethereum Mainnet to xDai on xDai Chainhttps://dai-bridge.poa.network/

  • Netstats , an overview of xDai Chain nodes http://dai-netstat.poa.network

To transform DAI to XDAI simply navigate to https://dai-bridge.poa.network/ and follow the instructions. We will be releasing a full tutorial and video guide soon.

Why would developers deploy to xDai Chain?

xDai Chain offers a variety of use cases to blockchain developers. Currently, one of the biggest concerns for developers is the inability to have a USD fixed value for payments related to their DApp. Users of the DApp are forced to pay fluctuating payments in ETH or a specific ERC-20 token that varies in value often resulting in a poor DApp user experience. xDai Chain solves this issue by allowing developers to fix their payments in XDAI. xDai Chain will have fast transaction time, low gas costs, easy scalability, and much more.

What tools does xDai Chain use?

xDai Chain uses various POA Network tools including the TokenBridge (Security audits).

xDai Chain and the Token Bridge are both protected by the same technology using the POA consensus (Security audit) with POA Network being in production since December 2017 and Token Bridge being in production since May 2018.

What will be MakerDAO and POA Network’s respective roles?

POA Network is responsible for leveraging their interoperability protocol and successfully applying it to the DAI stable coin to help create and launch xDai Chain network.

There are endless possibilities for how MakerDAO and Developers can leverage xDai Chain to deploy their DApps and projects.

Please check out the full list of FAQ regarding this initiative here.

The vision for xDai Chain and the XDAI coin is to create a blockchain network that takes all of the benefits of Ethereum-based blockchains and removes the concerning USD-volatility component. xDai Chain will also be able to leverage all of the open-source tools that have been built for the Ethereum ecosystem including all of POA Network’s tools and infrastructure.

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