Hop is a rollup-to-rollup general token bridge focused on Eth + l2 so far. It allows users to send tokens from one rollup or sidechain to another almost immediately without having to wait for the networks challenge period. It works by involving market makers who front the liquidity at the destination chain in exchange for a small fee. This credit is extended by the Bonder in form of hTokens which are then swapped for their native token counterpart in an AMM.
https://hop.exchange/
Bridge
Ethereum
Gnosis
Optimism
Arbitrum
Polygon
https://docs.hop.exchange/
Optimistic cross-chain bridge protocol that allows users to execute transactions between chains nearly instantaneously. This is accomplished by using an optimistic oracle, bonded relayers, and single-sided liquidity pools.
https://across.to/
Bridge
Ethereum
Boba
Optimism
Arbitrum
https://docs.across.to/v2/
Official Optimism bridge; takes 20minutes to deposit but 7 days to withdraw funds
Cross-chain communication for Web3 built on a PoS chain
https://axelar.network/#
Bridge
Gateway/Routing/Messaging
Transport
Ethereum
Avalanche
Polygon
Moonbeam
Fantom
https://docs.axelar.dev/
Celer State Guardian Network (SGN) is a Proof-of-Stake (PoS) blockchain built on Tendermint that serves as the message router between different blockchains.
Synapse is a universal cross-chain liquidity network that connects blockchains by offering an extensible cross-chain communication protocol which supports assets, smart contract calls, and more
https://synapseprotocol.com/
Bridge
Ethereum
Avalanche
Aurora
Arbitrum
Optimism
Polygon
Fantom
Boba
Cronos
Harmony
Metis
Moonbeam
Moonriver
Binance Chain
https://docs.synapseprotocol.com/
Nomad is a cross-chain messaging protocol leveraging an optimistic mechanism
Composable Cross-Chain VM (Composable XCVM) is a single, developer-friendly interface to orchestrate the interaction with different bridges, manage routing, initiate call-backs into smart contracts, and more
https://www.composable.finance/
Bridge
Gateway/Routing/Messaging
Polkadot
Ethereum
Polygon
Arbitrum
Avalanche
Moonriver
Fantom
https://docs.composable.finance/
Blockchain bridge
https://allbridge.io/
Bridge
Ethereum
Solana
Polygon
Binance Chain
Okchain
Celo
Avalanche
Huobi
Aurora
Near
Fantom
https://docs.allbridge.io/
cross-chain liquidity protocol (Omnipool) based on Tendermint & Cosmos-SDK and utilising Threshold Signature Schemes (TSS)
https://thorchain.org/
Bridge
Ethereum
Bitcoin
Litecoin
Binance Chain
Bitcoin Cash
Dogecoin
https://docs.thorchain.org/
Custodial bridging between exchanges and layer 2 solutions to save on gas costs
https://www.layerswap.io/
Bridge
Arbitrum
Optimism
https://www.layerswap.io/about
Direct bridges
https://www.wanchain.org/
Bridge
Ethereum
Wanchain
Polygon
Arbitrum
Avalanche
Bitcoin
Moonriver
https://www.explorewanchain.org/#/
Cross-rollup bridge for transferring the Ethereum native assets
https://bridge.orbitchain.io/
Bridge
Ethereum
Arbitrum
Optimism
Polygon
zksync
Starknet
ImmutableX
https://docs.orbiter.finance/
Network and bridge
https://poly.network/
Bridge
Ethereum
Ontology
Polygon
Heco
Avalanche
Arbitrum
Optimism
Zilliqa
Elrond
Gnosis
DEX for Eth <> Cosmos via Peggy and IBC; Thorchain with pegged assets