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Architecture

The LI.FI Contract is built using the EIP-2535 (Multi-facet Proxy) standard. The contract logic lives behind a single contract that in turn uses DELEGATECALL to call facet contracts that contain the business logic. All business logic is built using facet contracts that live in src/Facets. For more information on EIP-2535 you can view the entire EIP here.

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Contract Flow

A basic example would be a user bridging from one chain to another using Stargate Protocol. The user would interact with the LI.FIDiamond contract which would pass the Stargate-specific call to the StargateV2Facet which then passes required calls + parameters to Stargate’s contracts. The basic flow is illustrated below.

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Diamond Helper Contracts

The LI.FI Diamond contract is deployed along with some helper contracts that facilitate things like upgrading facet contracts, look-ups for methods on facet contracts, ownership checking and withdrawals of funds. For specific details please check out EIP-2535.