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Widget Integration

The CoW Widget is the fastest way to integrate CoW Protocol's trading functionality into your application. It provides a complete, pre-built trading interface that can be embedded with just a few lines of code.

Overview​

The CoW Widget is a ready-to-use component that provides the full CoW Swap trading experience. It's perfect for projects that want to add trading functionality quickly without building a custom interface from scratch.

Key Features​

  • Zero configuration: Works out-of-the-box with minimal setup
  • Fully responsive: Adapts to different screen sizes
  • Customizable themes: Light, dark, and custom color schemes
  • Partner fees: Earn revenue on trades through your integration
  • Multi-network support: All CoW Protocol-enabled networks
  • Wallet integration: Connect to existing wallet providers or standalone mode

Quick Start Example​

import { createCowSwapWidget, CowSwapWidgetParams } from '@cowprotocol/widget-lib'

// HTML element where the widget will be rendered
const widgetContainer = document.getElementById('cowswap-widget')

const params: CowSwapWidgetParams = {
  appCode: 'YOUR-APP-NAME', // Required: identifies your app
  width: '600px',
  height: '640px',
  sell: { asset: 'USDC' },
  buy: { asset: 'WETH', amount: '0.1' },
  theme: 'light', // 'light' | 'dark' | custom theme object
  partnerFee: {
    bps: 50, // 0.5% fee
    recipient: '0xYourFeeRecipientAddress',
  },
}

createCowSwapWidget(widgetContainer, { params })

Installation​

# Install the widget library
npm install @cowprotocol/widget-lib

Building with React? Use @cowprotocol/widget-react instead - it wraps the widget as a React component.

Configuration Options​

The widget supports extensive customization:

  • Trading pairs: Pre-select sell/buy tokens and amounts
  • Partner fees: Earn revenue on trades (up to 1%)
  • Custom themes: Match your app's branding
  • Token lists: Use custom token lists
  • Wallet integration: Connect to your app's wallet or standalone mode
  • Event handling: Listen to trading events and notifications
  • And more: Slippage limits, token pair constraints, custom sounds and images

When to Use the Widget​

  • Rapid integration: Get trading functionality live in minutes
  • Standard UI/UX: When CoW Swap's interface meets your needs
  • Minimal development: Perfect for MVPs and quick prototypes
  • Partner fees: Easy way to monetize trading volume

Widget Configurator​

Use the interactive configurator at widget.cow.fi to:

  • Preview different configurations
  • Generate code snippets
  • Test custom themes
  • Configure partner fees

Next Steps​

For detailed configuration options, event handling, and advanced customization, see the Widget Tutorial.

Resources​