> For the complete documentation index, see [llms.txt](https://wiki-apps.acala.network/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://wiki-apps.acala.network/general/address-binding.md). # Address Binding What is address binding? Learn how to bind your Substrate account to your own EVM account. ## Background EVM+ is live on Acala and Karura and EVM wallet is required to access its feature - such as transferring ERC20 tokens. Acala's EVM+ has built in feature to auto-generate and auto-bind an EVM address to the Substrate (Polkadot) address when needed, so it is seamless for users to use EVM features. As there is no private key for the auto-generated account, this account can only be accessed through Polkadot address on supported Dapps such as Acala/Karura. For users with existing EVM account and want to bind this account to the Polkadot address instead, this document describes the process for user to bind their own EVM account. ## Video {% embed url="" %} ## Pre-Requisites * MetaMask and Substrate Wallets, Substrate wallet not bound to any account. * ACA in your Substrate Wallet and other tokens in your MetaMask wallet to pay for transaction fees. You can learn how to create a Substrate wallet by following any of these [guides](https://wiki.acala.network/get-started/acala-network/acala-account). You can learn how to send ACA to your Acala wallet by following this [guide. ](https://wiki.acala.network/integrate/integration/token-transfer) You can learn how to create a MetaMask wallet by following this [guide](https://www.youtube.com/watch?v=GNPz-Dv5BjM). ## Address Binding **Note there are a few restrictions of the bind feature by design:** * **Binds can only be done between one Substrate and one MetaMask account** * **Neither account can be previously bound to another account. Additionally, binding is final - there is no unbind feature.** 1\) Go to [Bind MetaMask](https://apps.acala.network/bridge/bind-address) in the Acala app. Click `Connect to MetaMask` and select the account you'd like to connect. Do the same thing for your Substrate account. ![](https://2484935697-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FHWNwYwj4jC1zxWo5TkwD%2Fuploads%2Fys6lGLmYjKF0FnU46HIE%2F29EDDD59-3E9C-4936-9864-A2A65D561080.jpeg?alt=media\&token=334ef52e-4158-4086-806d-0ee6004d9651) 2\) **Double check that you are binding the correct accounts because this action cannot be undone.** Click `Sign`. If you are having trouble connecting your MetMask, you can either add it via [Acala](https://chainlist.org/chain/787) and [Karura](https://chainlist.org/chain/686) on ChainList, or manually add the Acala network by opening your MetaMask wallet and going to Settings-> Networks -> Add Networks and entering the following information:\ \ **Network Name:** Acala **New RPC URL**`https://eth-rpc-acala.aca-api.network/` **Chain ID:** 787 **Currency Symbol:** ACA **Block Explorer URL**`https://blockscout.acala.network/` ![](https://2484935697-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FHWNwYwj4jC1zxWo5TkwD%2Fuploads%2Fl2J5xJ9ajQiyt1h229or%2F607838A2-9BAD-40B8-B388-4D58F254602D.jpeg?alt=media\&token=9d77246f-6954-4f36-8543-70ad391e55c4) \ 3\) Click `Bind`. Remember that in order to bind, you must have `ACA` in your Substrate account. You can learn how to send ACA to your Acala wallet by following this [guide.](https://wiki.acala.network/integrate/integration/token-transfer) ![](https://2484935697-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FHWNwYwj4jC1zxWo5TkwD%2Fuploads%2F4Q4zm6I1crLm4q0Kwnbl%2F22D7941A-EB6C-4DE4-ADE2-FAAFF29A34C0.jpeg?alt=media\&token=df76de73-f160-46ba-b9d3-5c8a86b50bd2) 4\) You should now see that your accounts have been successfully bound! ![](https://2484935697-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FHWNwYwj4jC1zxWo5TkwD%2Fuploads%2FG1qU4Vx8s6GRQonM0bQQ%2F9C37755C-A592-41DA-924E-8657FDE296C4.jpeg?alt=media\&token=812a40c6-2d64-4707-9602-5e715e1ac9cd) ## FAQ #### Can I unbind and bind to a new account? No. Once you bind two accounts together, you cannot unbind them. If you you'd like to use a different Polkadot account or a different Ethereum account, you'll need to create two new wallets. **Do I need to keep both seed phrases?** Yes. Please keep both seed phrases. If you ever need to recover all of your funds, you will need both sets of seed phrases. **Where can I see the MetaMask address linked to my account?** If you've already completed the binding process, click on your account in the upper right hand corner and then hover over the chain icon to see the linked MetaMask address. #### What are the differences between auto-generated EVM address and binding my own EVM address? There is no difference when you are using it within Acala/Karura, but binding your own EVM address gives you additional flexibility in interacting with your account using your EVM wallet such as MetaMask. ![](https://lh4.googleusercontent.com/-B-rHmeDut74rF-RdLbpe-1f4nztlMahvLPjQTuXAdWrEWU3MHw71Xi_MTF-VmUvzo7xK8MDliQj5e-UH0j6ndP8XekrOz0nYaYZf3P0bY4K1e3UibRGHdi20VvOnI5DpKv4JgiqT2eSQmKmxA) **Why is MetaMask having trouble connecting to Acala?** If you are having trouble connecting your MetMask, you can manually add the Acala network by opening your MetaMask wallet and going to Settings-> Networks -> Add Networks and entering the following information:\ \ **Network Name:** Acala **New RPC URL**`https://eth-rpc-acala.aca-api.network/` **Chain ID:** 787 **Currency symbol:** ACA **Block Explorer URL**`https://blockscout.acala.network/`