{
  inputs = {
    flake-parts.url = "github:hercules-ci/flake-parts";
    nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable";
    treefmt-nix = {
      url = "github:numtide/treefmt-nix";
      inputs.nixpkgs.follows = "nixpkgs";
    };
    git-hooks = {
      url = "github:cachix/git-hooks.nix";
      inputs.nixpkgs.follows = "nixpkgs";
    };
    flake-root.url = "github:srid/flake-root";
    nix-github-actions = {
      url = "github:nix-community/nix-github-actions";
      inputs.nixpkgs.follows = "nixpkgs";
    };
    forge-std = {
      flake = false;
      url = "github:foundry-rs/forge-std/v1.9.6";
    };
  };

  outputs = inputs:
    inputs.flake-parts.lib.mkFlake { inherit inputs; } ({ config, lib, ... }: {
      systems = [ "x86_64-linux" ];

      imports = [
        inputs.git-hooks.flakeModule
        inputs.treefmt-nix.flakeModule
        inputs.flake-root.flakeModule
      ];

      perSystem = { pkgs, config, ... }: {
        treefmt.config = {
          flakeFormatter = true;
          flakeCheck = true;
          programs = {
            nixpkgs-fmt.enable = true;
            rustfmt.enable = true;
          };
        };

        pre-commit = {
          check.enable = false;
          settings.hooks = {
            treefmt = {
              enable = true;
              package = config.treefmt.build.wrapper;
            };
          };
        };

        devShells.default = pkgs.mkShell {
          packages = with pkgs; [ cargo rustc rust-analyzer clippy foundry ];
          inputsFrom = [ config.flake-root.devShell ];
          shellHook = ''
            # forge will use this directory to download the solc compilers
            mkdir -p $HOME/.svm

            # forge needs forge-std to work
            mkdir -p $FLAKE_ROOT/onchain/lib/
            ln -sf ${inputs.forge-std.outPath} $FLAKE_ROOT/onchain/lib/forge-std

            if [ ! -f "$FLAKE_ROOT/offchain/config.kdl" ]; then \
              cp ${config.packages.arbi_sample_config_kdl} $FLAKE_ROOT/offchain/config.kdl
            fi
            export ARBI_CONFIG="$FLAKE_ROOT/offchain/config.kdl"

            ${config.pre-commit.installationScript}
          '';
          env = {
            OPENSSL_DIR = pkgs.openssl.dev;
            OPENSSL_NO_VENDOR = true;
            OPENSSL_LIB_DIR = "${pkgs.openssl.out}/lib";
            OPENSSL_INCLUDE_DIR = "${pkgs.openssl.dev}/include";
            PKG_CONFIG_PATH = "${pkgs.openssl.dev}/lib/pkgconfig:$PKG_CONFIG_PATH";
            RUST_BACKTRACE = true;
            ARBI_LOG_LEVEL = "debug";
          };
        };

        packages = {
          default = config.packages.arbi;

          arbi = pkgs.rustPlatform.buildRustPackage {
            pname = "arbi";
            version = "0.1.0";
            cargoLock.lockFile = ./offchain/Cargo.lock;
            src = ./offchain;
            env = {
              OPENSSL_DIR = pkgs.openssl.dev;
              OPENSSL_NO_VENDOR = true;
              OPENSSL_LIB_DIR = "${pkgs.openssl.out}/lib";
              OPENSSL_INCLUDE_DIR = "${pkgs.openssl.dev}/include";
              PKG_CONFIG_PATH = "${pkgs.openssl.dev}/lib/pkgconfig:$PKG_CONFIG_PATH";
            };
          };

          arbi_sample_config_kdl = pkgs.writeText "arbi-sample-config.kdl" ''
            endpoint "wss://eth-mainnet.g.alchemy.com/v2/<REDACTED>"
            pairs_file "pairs.json"
          '';
        };

        checks = {
          inherit (config.packages) arbi;
        };
      };

      flake.githubActions = inputs.nix-github-actions.lib.mkGithubMatrix {
        checks = lib.getAttrs [ "x86_64-linux" ] config.flake.checks;
      };
    });
}