Optics is a new protocol for gas-efficient and trust-minimized interoperability. Its name is an acronym derived from its description: OPTimistic Inter-chain Communication Standard. Unlike other cross-chain communication systems, Optics is neither a custodial bridge, validator-based bridge, nor header relay. Instead, it leverages an optimistic bridging mechanism to enable radically cheaper communication between chains, while still preserving decentralization. Optics core contracts and token bridge contracts have been deployed on Celo, Ethereum, and Polygon mainnets. We are also running off-chain agents to update, relay, and process messages between chains. This means that you can interact directly with the contracts to send ERC-20 tokens between all 3 chains.