Solana-Axelar Interoperability

This repository contains the integration work between Solana and Axelar, enabling seamless cross-chain communication. The project includes General Message Passing (GMP) contracts and other Axelar core components.

Table of Contents

• Repository contents
  • Solana contracts
    • Utility crates
  • EVM Smart contracts
  • Related repositories
• Getting Started
  • Prerequisites
  • Installation

Repository contents

The Solana-Axelar integration contains on-chain and off-chain components.

Solana contracts

• Gateway: The core contract responsible for authenticating GMP messages.
• Gas Service: Used for gas payments for the relayer.
• Interchain Token Service: Bridge tokens between chains.
• Multicall: Execute multiple actions from a single GMP message.
• Governance: The governing entity over on-chain programs, responsible for program upgrades.
• Memo: An example program that sends and receives GMP messages.

Utility crates

• Axelar Executable: A set of libraries & interfaces that the destination program (3rd party integration) must implement.
• Axelar Solana Encoding: Encoding used by the Multisig Prover to encode the data in a way that the relayer & the Solana Gateway can interpret.
• Gateway Event Stack: The Relayer uses this crate to parse Gas Service & Gateway events.

EVM Smart Contracts

• Axelar Memo: A counterpart of the axelar-solana-memo program that acts as an example program used to send GMP messages back and forth Solana.
• Axelar Solana Multi Call: An example contract used to showcase how to compose Multicall payloads for Solana.
• Solana Gateway Payload: A Solditiy library that can create Solana-specific GMP payloads.

Related Repositories

• Solana Relayer: The off-chain entity that will route your messages to and from Solana.
• Relayer Core: All Axelar-related relayer infrastructure. Used as a core building block for the Solana Relayer. The Axelar-Starknet and Axlelar-Aleo relayers also use it.
• Multisig Prover: The entity on the Axelar chain that is responsible for encoding the data for the Relayer and the Solana Gateway
• Utility Scripts: Deployment scripts; GMP testing scripts and other utilities.

Getting Started

Prerequisites

• Solana CLI (for running tests during development)
• Foundry (for running e2e tests, GMP examples between Solana and an EVM chain)

Installation

git clone [email protected]:eigerco/solana-axelar.git
cd solana
cargo xtask test

About Eiger

We are engineers. We contribute to various ecosystems by building low-level implementations and core components. We work on several Axelar and Solana projects and connecting these two is a fundamental goal to achieve cross-chain execution.

Contact us at [email protected] Follow us on X/Twitter