Celer cBridge
A multi-chain, cross-layer asset bridge offering instant transfers with low fees and zero trust.
Overview
cBridge is a decentralized, multi-chain asset bridge developed by Celer Network that enables instant and low-cost token transfers across numerous blockchain networks and layers. It supports a wide range of chains and tokens, providing a trustless environment where relay nodes facilitate cross-chain transfers without custody of user funds. The system leverages Hashed Time Lock (HTL) contracts to secure transfers and ensure atomicity, protecting relay nodes from malicious user behavior.
The core component is the cBridge relay node, an open-source Golang implementation that operators can deploy on Linux machines. Relay nodes require an Ethereum keystore for signing transactions and must maintain sufficient token liquidity and gas balances on supported chains. The relay node interacts with cBridge smart contracts deployed on each chain and uses CockroachDB to store transfer records. Operators configure their nodes with chain-specific RPC endpoints, token lists, and fee rates, allowing flexible support for various tokens and chains.
cBridge differentiates itself by supporting the largest number of chains and tokens among bridges, offering some of the lowest fees, and providing a zero-trust model where relay nodes never custody user funds. Its relay node selection algorithm prioritizes nodes with high success rates and competitive fees, incentivizing reliable operation. The project provides detailed operational best practices, including monitoring for node uptime, liquidity, and gas balances, as well as fee adjustment strategies to maintain competitiveness. Developers and operators can get started by following the comprehensive documentation and deploying relay nodes with provided binaries or source code.
The Problem
Cross-chain asset transfers often suffer from high fees, slow finality, and centralized custody risks. Many bridges require trust in operators or custodians, exposing users to potential fund loss. Additionally, operating a reliable bridge node involves complex setup and maintenance challenges.
The Solution
Key Features
Relay Node with CockroachDB Backend
Relay nodes use CockroachDB to store transfer records and manage state.
Configurable Chain and Token Support
Operators specify supported chains, tokens, RPC endpoints, and fee rates in config files.
Automatic Transfer Recovery
Relay nodes automatically resume in-progress transfers after failures or restarts.
Detailed Node and Network Stats API
Provides HTTP endpoints to query relay node stats and global network transfer data.
Key Strengths
How Developers Use Celer cBridge
Operating a cBridge Relay Node
Infrastructure developers deploy and maintain relay nodes to facilitate cross-chain transfers and earn fees.
Integrating Cross-Chain Transfers in DeFi Apps
DeFi developers use cBridge to enable users to move assets seamlessly between supported chains.
Enterprise Blockchain Interoperability
Enterprise teams leverage cBridge to connect private and public blockchains for asset movement.
Works Well WithEthereumAvalancheFantomArbitrum One
Optimism
Boba
Metis
Oasis
Moonbeam
Aptos
Evmos
Flow
Sui
Linea
Starknet
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Pricing
Open Source | |
|---|---|
| Price (Monthly) | Free |
| Price (Annual) | Free |
| Messaging | N/A |
| Support | Community support via GitHub |
| Analytics |
Resources
cBridge provides comprehensive documentation, a GitHub repository with relay node source code, and network statistics endpoints to support developers and node operators.