Carbon DeFi is an advanced onchain trading protocol enabling automated limit orders, efficiently adjustable with custom price ranges, grid trading like recurring orders, working like a DEX trading bot.

To run the app locally, you need the following:

• Node.js 20+
• Yarn

For E2E testing you need a Tenderly account and API Key.

1. Copy the .env.sample file to .env and fill in the values.

2. In the project directory, you can install all dependencies by running:

yarn install

3. Run the app in development mode by running the following:

yarn start

You can choose the network to run the app by setting the VITE_NETWORK variable in the .env file. The default network is ethereum.

Alternatively, if defined in the in the package.json file, you can select the network to use by running yarn:network where network is one of the networks defined in the config and the yarn:network command is defined in package.json file as follows:

"start:network": "cross-env VITE_NETWORK=network vite",

Example:

"start:ethereum": "cross-env VITE_NETWORK=ethereum vite",

Open http://localhost:3000 to view the development mode app in the browser.

To launch the test runner, run the following command:

yarn test

If you wish to check the test coverage, run the following command:

yarn coverage

To run the E2E tests, you must have a Tenderly API key to create and delete forks. You can set it in the .env file. Please refer to the E2E readme for more information.

Running the following, will build the app for production:

yarn build

It will build the app for production to the build folder.

It correctly bundles the App in production mode and optimizes the build for the best performance.

The build is minified and the filenames include the hashes. Your app is ready to be deployed!

The '/debug' route is available to debug the app (ex: localhost:3000/debug). It can be accessed by pressing the Debug main menu option which is shown when the app is ran locally. From the debug page you can access the following features:

• Set Imposter Account: Allows to set any account in the active network to impersonate.
• Set Tenderly RPC: Allows to set the RPC URL from a Tenderly fork, as well as setting custom addresses for the carbonController contract and the carbonVoucher contract. Leaving Unchecked Signer checked is recommended as it avoids the need to populate all details of the transaction before returning it, and avoids transaction errors when using the app.
• Tenderly Faucet: After setting the Tenderly RPC and Tenderly Account, the faucet can be used to add tokens to the impersonated wallet.
• Transfer Strategy NFT allows to transfer the NFT that represents the strategy with ID Strategy ID to the Recipient wallet. The active wallet must be the owner of the NFT to be able to transfer it.
• Notifications: allows to test loading, success, failure and transaction rejected notifications.
• Set E2E flag: allows to set the E2E flag to true or false - used when running e2e tests.
• Create Strategy: Allows to easily create multiple strategies - useful for debugging and used in E2E tests. A strategy template must follow the form:

{
    "base": "ETH",
    "quote": "DAI",
    "buy": {
        "min": "1500",
        "max": "1700",
        "budget": "10"
    },
    "sell": {
        "min": "2000",
        "max": "2200",
        "budget": "1000"
    },
    "value": "10",
    "spread": "5"
}

where spread (fee tier in the UI) is in percentage, and value is the number of strategies to create.

1. Create a new folder under src/config with the name of the network (ex: "polygon")
2. Copy and paste the files from src/config/ethereum into your folder
3. Update the common.ts, production.ts & development.ts files with your config, pointing to the CarbonDeFi contracts in that network, as well as setting the rpc.url and rpc.headers (rpc.url must match the one found in Chain Lists).
4. Update the src/config/index.ts files to import your files index.ts

As an example on adding Polygon network:

import ethereumDev from './ethereum/development';
import ethereumProd from './ethereum/production';
// Import polygon config
import polygonDev from './polygon/development';
import polygonProd from './polygon/production';

const configs = {
    ethereum: {
        development: ethereumDev,
        production: ethereumProd,
    },
    // add polygon here
    polygon: {
        development: polygonDev,
        production: polygonProd,
    },
};

5. Update the .env file to use the required network (ex: "polygon").

# Use polygon network
VITE_NETWORK=polygon
# Use any RPC URL to your network
VITE_CHAIN_RPC_URL=https://eth-mainnet.alchemyapi.io/v2/<API_KEY>

The app will use the rpc for the following purposes:

1. Add a network to the injected wallet.
2. Fetch data from the network.

If VITE_CHAIN_RPC_URL is not set, the app will use the rpc.url and rpc.headers from the development/production network configuration.

In case the network is using a version of CarbonController older than 5 then there's no support for extended range for trade by source, and it is recommended to set VITE_LEGACY_TRADE_BY_SOURCE_RANGE to true in .env to avoid possible reverts.

The file common.ts with type AppConfig contains important configuration for the app and network. It includes the following:

• appUrl: The URL of the app.
• carbonApi: The URL of the API.
• walletConnectProjectId: The WalletConnect project ID If you wish to add walletConnect, make sure to add it to selectableConnectionTypes as well.
• selectedConnectors: List of connectors to make available by default in the wallet selection modal that will be shown even if the connector is not injected.
• blockedConnectors: List of EIP-6963 injected connectors names to block in the wallet selection modal.
• isSimulatorEnabled: Flag to enable the simulation page.
• network
  • name: Network name.
  • logoUrl: Network logo URL.
  • chainId: Chain ID.
  • defaultLimitedApproval: Optional flag to set the default ERC-20 approval to limited approval. For chains where gas is low, it is recommended to set this flag to true.
  • gasToken: Gas token name, symbol, decimals, address and logoURI. This parameter will take priority over the tokenListOverride.
  • blockExplorer: The name and URL of the block explorer to be used in the notifications and when the network is added to the injected wallet.
  • rpc: The RPC url and headers of the network, used to add the network to the injected wallet and to fetch data from the chain.
• defaultTokenPair: Default token pair to be used in the app when opening the trade, explore, and simulation pages.
• popularPairs: List of popular pairs to be used in the app when opening the token selection modal.
• popularTokens: List of popular tokens to be used in the app when opening the token selection modal.
• addresses/carbon and addresses/utils: CarbonController, Voucher and multicall3 contract addresses.
• tokenListOverride: Token list override to be used in the app when fetching the token list. Tokens in the list will override any other token with the same address.
• tokenLists: List of token lists including the uri and the parser to be used to parse the token list.
• sdk/cacheTTL: When the app loads, it will ignore any cached data if it is older than the cacheTTL time in milliseconds. If set to 0, the app will always ignore the cache data and fetch new data on load.

The CarbonDeFi Contracts, Backend and SDK use an internal fixed address for the native gas token, 0xEeeeeEeeeEeEeeEeEeEeeEEEeeeeEeeeeeeeEEeE, hereby called native token. If a different gas token address than the native token address is set in network.gasToken.address, the app will hide the gas token from the token list and use the network token address for all token and pair searches.

The file pairsToExchangeMapping.ts contains the mapping of pair symbols to exchange symbol to be used in the TradingView chart.

To change the logo in the app, you can replace the following files with your own:

• Logo file: carbon.svg.
• Banner file: carbon.jpg - used when sharing links to the app.
• Carbon Logo Loading: CarbonLogoLoading.tsx - Used for loading animations in the app.
• Favicon file: favicon.ico.

Please do not replace the carbondefi.svg file as it is used for the "Powered by CarbonDeFi" logo in the footer.

The theme is defined in the tailwind.config.ts file. You can update these colors:

• background: used for surfaces
• primary: used for buttons and other actionable elements
• success: used for positive information like positive ROI.
• error: used for error messages & buttons
• warning: used for warning messages (mainly in forms)
• buy: used for any information related to buy operation
• sell: used for any information related to sell operation

oklch: colors are using oklch function to keep contrast no matter the color used. For browser support reason we decided to used the library culari to transform oklch into rgb instead of the native css method.

To get the oklch value of an hex color you can use this webapp: https://oklch.com

Background shades are calculated based on hue and chroma. In tailwind.config.ts you can specify hue and chroma of the background.

• hue: from 0 (pink) to 360 (pink).
• chroma: It's recommended to use 0.01 or 0.02 depending on the hue.

All other colors are defined with l,c,h values (see https://oklch.com), and the computed palettes will look like that:

[color]: {
  light: lighten(value, 20%),
  DEFAULT: value,
  dark: darken(value, 50%),
}

You can change the % of the lighten & darken function with the lightDark function.

The application uses two fonts :

• BW Gradual for the titles
• Euclid Circle A for the text

You can change the font by changing the files under :

• src/assets/font/title
• src/assets/font/text

Use the same naming as the current files.

If you want to change the weight & format of the fonts you'll need to update the src/fonts.css file.

If you want to use only one font, the easiest is to update tailwind.config.ts. Under theme.fontFamily change the name of the font.

For example, if you want to only use Carbon Text:

fontFamily: {
  text: ['Carbon-Text', 'sans-serif'],
  title: ['Carbon-Text', 'sans-serif'], // change to Carbon Text here
},

You can also remove the unused @font-face from the src/fonts.css file.

The license used is the MIT License. You can find it here.