Mercury Token is a Waves-based token that was created to facilitate cross-chain communication, and timestamping, between the Waves blockchain and the Jupiter blockchain.

The Kava token fuels the Kava.io cross-chain collateralized debt platform. Kava’s multi collateral CDP system allows users to collateralize a variety of assets so that they can increase their exposure to favorable trading conditions in volatile markets. The Kava platform is secured by over 100 validators and uses the Tendermint consensus algorithm.

AION calls itself a 3rd generation blockchain network, and is primarily focused on connecting blockchain networks. AOIN aims to solve the interoperability issues facing the various blockchains, and be the connecting bridge between them. AION's cross-chain platform has different consensus mechanisms for interchain and on-chain transactions. The on-chain consensus mechanism combines BFT (Byzantine Fault Tolerance), dPoS (Delegated Proof-of-Stake) and a new neural network inspired verification algorithm known as Proof-of-Intelligence.
Interchain transactions are managed by bridges. The bridges has a consensus mechanism that is different from the main AION chain, and each bridge is secured by an individual consensus. The bridge validators will be rewarded by interchain transaction fees.