Axiom V2 Periphery

This repo contains client smart contracts and interfaces for applications integrating Axiom V2. To learn more about how to integrate Axiom into your application, see the developer docs. For the complete Axiom V2 smart contract code, see the smart contract repo here.

Installation

To use smart contracts or test utilities from this repo in your external Foundry project, run:

forge install axiom-crypto/axiom-v2-periphery

Add @axiom-crypto/v2-periphery/=lib/axiom-v2-periphery/src in remappings.txt.

Usage

Once installed, you can use the contracts in this library by importing them. All interfaces are available under @axiom-crypto/v2-periphery/interfaces. For security, you should use the installed code as-is; we do not recommend copy-pasting from other sources or modifying yourself.

See our quickstart repo for a minimal example.

Implementing a client for Axiom V2

To integrate your application with Axiom, you should inherit from AxiomV2Client in your contract:

pragma solidity ^0.8.0;

import { AxiomV2Client } from "@axiom-crypto/v2-periphery/client/AxiomV2Client.sol";

contract AverageBalance is AxiomV2Client {
    bytes32 immutable QUERY_SCHEMA;
    uint64 immutable SOURCE_CHAIN_ID;

    constructor(address _axiomV2QueryAddress, uint64 _callbackSourceChainId, bytes32 _querySchema)
        AxiomV2Client(_axiomV2QueryAddress)
    {
        QUERY_SCHEMA = _querySchema;
        SOURCE_CHAIN_ID = _callbackSourceChainId;
    }

    function _validateAxiomV2Call(
        AxiomCallbackType, // callbackType,
        uint64 sourceChainId,
        address, // caller,
        bytes32 querySchema,
        uint256, // queryId,
        bytes calldata // extraData
    ) internal view override {
        require(sourceChainId == SOURCE_CHAIN_ID, "Source chain ID does not match");
        require(querySchema == QUERY_SCHEMA, "Invalid query schema");
    }

    function _axiomV2Callback(
        uint64, // sourceChainId,
        address, // caller,
        bytes32, // querySchema,
        uint256, // queryId,
        bytes32[] calldata axiomResults,
        bytes calldata // extraData
    ) internal override {
        // <Implement your application logic with axiomResults>
    }
}

Testing with axiom-std Foundry tests

To test your code, you can use axiom-std, an extension to the standard Foundry test library that provides Axiom-specific cheatcodes accessible to your Foundry tests. See our axiom-std repo for further documentation and our quickstart repo for a minimal example using both AxiomV2Client and axiom-std.

Running this repo for development

This repo contains both Foundry packages. To install, run:

forge install