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Introduction

The CoW Protocol BFF is a comprehensive collection of TypeScript-based backend services designed to power the CoW Swap frontend and other CoW Protocol applications.

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Core Capabilities

The platform offers six main feature categories:
  1. Multi-Chain Support - Token pricing and balance data across eight networks (Ethereum, Gnosis Chain, Polygon, Arbitrum, Base, Avalanche, BNB Chain, and Sepolia testnet)
  2. Real-Time Updates - Server-Sent Events delivering live wallet balance information for multiple tokens simultaneously
  3. Notifications - Telegram integration with RabbitMQ messaging for order status alerts
  4. Market Analysis - Dynamic slippage calculations based on volatility patterns
  5. Transaction Preview - Tenderly-powered simulation tools for trade outcome forecasting
  6. Yield Tracking - Multi-protocol DeFi opportunity aggregation and comparison

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Technical Foundation

The architecture utilizes:
  • Fastify - HTTP framework
  • NX - Monorepo management
  • PostgreSQL with TypeORM - Data persistence
  • Redis - Caching
  • RabbitMQ - Asynchronous messaging
  • Ethers.js/Viem - Blockchain interactions

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Service Components

Four primary applications form the system:
  • API Service - REST endpoints
  • Notification Producer - Event monitoring
  • Telegram Service - Message delivery
  • TWAP Service - Price calculations
These are supplemented by shared libraries for repositories, business logic, and utilities.
Last modified on March 4, 2026