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This page provides information about the smart contracts that enable cross-chain bridging between Neutron and other networks.

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Mainnet (neutron-1)

ContractAddressCode ID
Lido Satellite (neutron-1)neutron1ug740qrkquxzrk2hh29qrlx3sktkfml3je7juusc2te7xmvsscns0n2wry233
GMP Helper (Ethereum)0x8A5fcd88B4aC70A1939955fAeA4E12bd0C7B1237-

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Testnet (pion-1)

ContractAddress
Lido Satellite (pion-1)neutron1pf7u5tqkc9xc5l2xjqzsufc467ccmjxw68v5hl0k5gaye7zer3tqvrucam
GMP Helper (Sepolia)0x5b154522aa5CDDCed12515719E1d4dFf76F2b37b

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Lido Satellite Contract

The Lido Satellite contract enables bridging of Lido’s staked ETH (stETH) to Neutron. It provides a TokenFactory representation of the wrapped staked ETH (wstETH) which can be used throughout the Neutron ecosystem.

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Supported Tokens

NetworkSymbolDenom
MainnetwstETHfactory/neutron1ug740qrkquxzrk2hh29qrlx3sktkfml3je7juusc2te7xmvsscns0n2wry/wstETH
TestnetwstETHfactory/neutron1pf7u5tqkc9xc5l2xjqzsufc467ccmjxw68v5hl0k5gaye7zer3tqvrucam/wstETH

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How the Bridge Works

  1. Axelar Integration: The Neutron bridge uses Axelar’s General Message Passing (GMP) to facilitate cross-chain communication
  2. Minting and Burning: When wstETH is bridged to Neutron, the corresponding tokens are locked on Ethereum, and native tokens are minted on Neutron
  3. Token Standards: TokenFactory standards on Neutron ensure that the bridged tokens behave like native Cosmos assets
  4. Fee Mechanics: The bridge charges a small fee for transfers to cover operational costs

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Using the Bridge

To interact with the bridge, you can use the Neutron Bridge UI or interact directly with the contracts.

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Example Bridge Queries

# Query bridge token info
neutrond query wasm contract-state smart neutron1ug740qrkquxzrk2hh29qrlx3sktkfml3je7juusc2te7xmvsscns0n2wry '{"token_info":{}}'

# Check bridge limits
neutrond query wasm contract-state smart neutron1ug740qrkquxzrk2hh29qrlx3sktkfml3je7juusc2te7xmvsscns0n2wry '{"bridge_limits":{}}'

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Bridge Security

The bridge security model includes:
  1. Axelar Validators: The bridge relies on Axelar’s validator network for secure message passing
  2. Multi-Signature Controls: Administrative actions require approval from multiple parties
  3. Rate Limiting: The bridge includes rate limits to prevent catastrophic failures
  4. Upgradability: The bridge can be upgraded to patch security vulnerabilities

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Future Bridge Developments

The Neutron team is working on expanding bridge capabilities to include:
  1. More assets and token standards
  2. Additional source chains beyond Ethereum
  3. Improved efficiency and reduced fees
  4. Enhanced user interfaces for easier bridging

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Bridge Monitoring

You can monitor bridge activities using the following resources:
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