diff --git a/.gitmodules b/.gitmodules
new file mode 100644
index 0000000..acd01fd
--- /dev/null
+++ b/.gitmodules
@@ -0,0 +1,3 @@
+[submodule "packages/contracts/lib/forge-std"]
+	path = packages/contracts/lib/forge-std
+	url = https://github.com/foundry-rs/forge-std
diff --git a/packages/contracts/.eslintrc.js b/packages/contracts/.eslintrc.js
deleted file mode 100644
index ac96533..0000000
--- a/packages/contracts/.eslintrc.js
+++ /dev/null
@@ -1,3 +0,0 @@
-module.exports = {
-  extends: '../../.eslintrc.json',
-}
diff --git a/packages/contracts/.eslintrc.json b/packages/contracts/.eslintrc.json
deleted file mode 100644
index 167952a..0000000
--- a/packages/contracts/.eslintrc.json
+++ /dev/null
@@ -1,90 +0,0 @@
-{
-  "env": {
-    "es6": true,
-    "mocha": true,
-    "node": true
-  },
-  "extends": [
-    "eslint:recommended",
-    "plugin:import/recommended",
-    "plugin:import/typescript",
-    "plugin:@typescript-eslint/recommended",
-    "plugin:@typescript-eslint/recommended-requiring-type-checking",
-    "plugin:@typescript-eslint/strict"
-  ],
-  "parser": "@typescript-eslint/parser",
-  "parserOptions": {
-    "project": "./tsconfig.json",
-    "sourceType": "module"
-  },
-  "plugins": ["simple-import-sort", "no-only-tests", "unused-imports", "react"],
-  "rules": {
-    "@typescript-eslint/prefer-readonly": ["error"],
-    "@typescript-eslint/ban-tslint-comment": "off",
-    "@typescript-eslint/explicit-function-return-type": "error",
-    "@typescript-eslint/explicit-module-boundary-types": "off",
-    "@typescript-eslint/no-extra-semi": "off",
-    "@typescript-eslint/no-empty-function": "off",
-    "@typescript-eslint/no-throw-literal": "off",
-    "@typescript-eslint/no-unused-vars": [
-      "warn",
-      { "varsIgnorePattern": "^_", "argsIgnorePattern": "^_" }
-    ],
-    "import/no-cycle": "error",
-    "import/no-default-export": "error",
-    "import/no-extraneous-dependencies": [
-      "error",
-      { "devDependencies": false }
-    ],
-    "import/no-unresolved": ["error", { "ignore": ["^knex/types/tables$"] }],
-    "import/no-internal-modules": [
-      "error",
-      {
-        "forbid": ["@l2beat/*/**"]
-      }
-    ],
-    "no-constant-condition": "off",
-    "no-only-tests/no-only-tests": "error",
-    "no-restricted-imports": [
-      "error",
-      {
-        "paths": [".", "..", "../..", "../../.."],
-        "patterns": [
-          {
-            "group": ["ethers/*"],
-            "message": "Do not import from ethers submodules. For example instead of importing getAddress from ethers/lib/utils, import utils from ethers and use utils.getAddress"
-          }
-        ]
-      }
-    ],
-    "simple-import-sort/imports": "error",
-    "simple-import-sort/exports": "error",
-    "unused-imports/no-unused-imports": "error",
-    "eqeqeq": "error",
-    "react/self-closing-comp": "error"
-  },
-  "overrides": [
-    {
-      "files": ["**/test/**/*.ts", "*.test.ts"],
-      "rules": {
-        "@typescript-eslint/no-explicit-any": "off",
-        "@typescript-eslint/no-non-null-assertion": "off",
-        "@typescript-eslint/no-unsafe-assignment": "off",
-        "@typescript-eslint/no-unsafe-call": "off",
-        "@typescript-eslint/no-unsafe-member-access": "off",
-        "@typescript-eslint/no-unsafe-return": "off",
-        "@typescript-eslint/require-await": "off",
-        "@typescript-eslint/unbound-method": "off",
-        "import/no-extraneous-dependencies": "off",
-        "no-unused-expressions": "off"
-      }
-    },
-    {
-      "files": ["src/**/*.stories.{ts,tsx}"],
-      "rules": {
-        "import/no-extraneous-dependencies": "off",
-        "import/no-default-export": "off"
-      }
-    }
-  ]
-}
diff --git a/packages/contracts/.gitignore b/packages/contracts/.gitignore
index 2a4cd8c..daca723 100644
--- a/packages/contracts/.gitignore
+++ b/packages/contracts/.gitignore
@@ -1,2 +1,11 @@
-# Hardhat
-build/
+# Foundry
+cache/
+out/
+.env
+broadcast/
+
+# JS
+node_modules/
+
+#yarn
+*.log
\ No newline at end of file
diff --git a/packages/contracts/.solhint.json b/packages/contracts/.solhint.json
new file mode 100644
index 0000000..d0a0acd
--- /dev/null
+++ b/packages/contracts/.solhint.json
@@ -0,0 +1,14 @@
+{
+  "extends": "solhint:recommended",
+  "rules": {
+    "code-complexity": ["error", 8],
+    "compiler-version": ["error", ">=0.8.0 <0.8.20"],
+    "func-name-mixedcase": "off",
+    "func-visibility": ["error", { "ignoreConstructors": true }],
+    "max-line-length": ["error", 120],
+    "named-parameters-mapping": "warn",
+    "no-console": "off",
+    "not-rely-on-time": "off",
+    "one-contract-per-file": "off"
+  }
+}
diff --git a/packages/contracts/README.md b/packages/contracts/README.md
new file mode 100644
index 0000000..0ca18dd
--- /dev/null
+++ b/packages/contracts/README.md
@@ -0,0 +1,20 @@
+# Byor Contracts
+
+## Usage
+```bash
+# Install
+$ cd packages/contracts && forge install
+
+# Build
+$ yarn build
+
+# Test
+$ yarn test
+
+# Deploy to anvil
+# open new terminal window
+$ anvil
+# update your .env file with a private key given to you by Anvil
+$ source .env
+$ yarn deploy:localhost
+```
diff --git a/packages/contracts/foundry.toml b/packages/contracts/foundry.toml
new file mode 100644
index 0000000..54e024e
--- /dev/null
+++ b/packages/contracts/foundry.toml
@@ -0,0 +1,6 @@
+[profile.default]
+src = "src"
+out = "out"
+libs = ["node_modules", "lib"]
+
+# See more config options https://github.com/foundry-rs/foundry/blob/master/crates/config/README.md#all-options
diff --git a/packages/contracts/hardhat.config.ts b/packages/contracts/hardhat.config.ts
deleted file mode 100644
index ccf9745..0000000
--- a/packages/contracts/hardhat.config.ts
+++ /dev/null
@@ -1,17 +0,0 @@
-import { HardhatUserConfig } from 'hardhat/config'
-import '@nomicfoundation/hardhat-toolbox'
-
-const config: HardhatUserConfig = {
-  solidity: '0.8.18',
-  paths: {
-    sources: './src',
-    tests: './test',
-    cache: './build/cache',
-    artifacts: './build/artifacts',
-  },
-  typechain: {
-    outDir: 'build/typechain',
-  },
-}
-
-export default config
diff --git a/packages/contracts/lib/forge-std b/packages/contracts/lib/forge-std
new file mode 160000
index 0000000..f73c73d
--- /dev/null
+++ b/packages/contracts/lib/forge-std
@@ -0,0 +1 @@
+Subproject commit f73c73d2018eb6a111f35e4dae7b4f27401e9421
diff --git a/packages/contracts/package.json b/packages/contracts/package.json
index a68c35c..5f66540 100644
--- a/packages/contracts/package.json
+++ b/packages/contracts/package.json
@@ -3,37 +3,18 @@
   "version": "0.1.0",
   "private": true,
   "scripts": {
-    "deploy": "hardhat run scripts/deploy.ts",
-    "test": "hardhat test",
-    "compile": "hardhat compile",
-    "clean": "rm -rf build",
+    "deploy": "forge script script/deploy.s.sol:DeployScript --broadcast",
+    "deploy:localhost": "yarn deploy --fork-url http://localhost:8545 --private-keys $PRIVATE_KEY",
+    "test": "forge test",
+    "compile": "forge build",
+    "clean": "rm -rf cache out",
     "format:fix": "prettier --write .",
     "format": "prettier --check .",
-    "lint:fix": "yarn lint --fix",
-    "lint": "eslint --ext .ts,.tsx --max-warnings 0 test scripts",
-    "typecheck": "tsc --noEmit"
+    "lint": "forge fmt --check && solhint {script,src,test}/**/*.sol",
+    "typecheck": "forge build"
   },
   "devDependencies": {
-    "@ethersproject/abi": "^5.7.0",
-    "@ethersproject/providers": "^5.7.2",
-    "@nomicfoundation/hardhat-chai-matchers": "^1.0.6",
-    "@nomicfoundation/hardhat-network-helpers": "^1.0.8",
-    "@nomicfoundation/hardhat-toolbox": "^2.0.2",
-    "@nomiclabs/hardhat-ethers": "^2.2.3",
-    "@nomiclabs/hardhat-etherscan": "^3.1.7",
-    "@typechain/ethers-v5": "^10.2.1",
-    "@typechain/hardhat": "^6.1.6",
-    "@types/chai": "^4.3.5",
-    "@types/mocha": "^10.0.1",
-    "@types/node": "^20.1.2",
-    "chai": "^4.3.7",
-    "ethers": "^5.0.0",
-    "hardhat-gas-reporter": "^1.0.9",
-    "solidity-coverage": "^0.8.2",
-    "ts-node": "^10.9.1",
-    "typechain": "^8.1.1"
-  },
-  "dependencies": {
-    "hardhat": "^2.14.0"
+    "prettier": "^3.1.0",
+    "solhint": "^4.0.0"
   }
 }
diff --git a/packages/contracts/remappings.txt b/packages/contracts/remappings.txt
new file mode 100644
index 0000000..845bd0a
--- /dev/null
+++ b/packages/contracts/remappings.txt
@@ -0,0 +1,2 @@
+ds-test/=lib/forge-std/lib/ds-test/src/
+forge-std/=lib/forge-std/src/
diff --git a/packages/contracts/script/deploy.s.sol b/packages/contracts/script/deploy.s.sol
new file mode 100644
index 0000000..68a2b41
--- /dev/null
+++ b/packages/contracts/script/deploy.s.sol
@@ -0,0 +1,12 @@
+// SPDX-License-Identifier: UNLICENSED
+pragma solidity ^0.8.13;
+
+import {Script} from "forge-std/Script.sol";
+import {Inputs} from "../src/Inputs.sol";
+
+contract DeployScript is Script {
+    function run() public returns (Inputs inputs) {
+        vm.broadcast();
+        inputs = new Inputs();
+    }
+}
diff --git a/packages/contracts/scripts/deploy.ts b/packages/contracts/scripts/deploy.ts
deleted file mode 100644
index 29ec81c..0000000
--- a/packages/contracts/scripts/deploy.ts
+++ /dev/null
@@ -1,68 +0,0 @@
-import net from 'node:net'
-
-import hre, { ethers } from 'hardhat'
-
-const DEFAULT_HARDHAT_NODE_PORT = hre.tasks.node?.paramDefinitions.port
-  ?.defaultValue as number
-
-async function isPortReachable(
-  port: number,
-  host: string,
-  timeout = 100,
-): Promise<boolean> {
-  const promise = new Promise((resolve, reject) => {
-    const socket = new net.Socket()
-
-    const onError = (): void => {
-      socket.destroy()
-      reject()
-    }
-
-    socket.setTimeout(timeout)
-    socket.once('error', onError)
-    socket.once('timeout', onError)
-
-    socket.connect(port, host, () => {
-      socket.end()
-      resolve(0)
-    })
-  })
-
-  try {
-    await promise
-    return true
-  } catch {
-    return false
-  }
-}
-
-async function startPerpetualHardhatNode(): Promise<boolean> {
-  hre.run('node').finally(() => {
-    console.log('Stopping node')
-  })
-
-  return isPortReachable(DEFAULT_HARDHAT_NODE_PORT, '127.0.0.1', 5000)
-}
-
-async function main(): Promise<void> {
-  if (hre.network.name === 'hardhat') {
-    // If we don't provide a network, hardhat will create a new one, we will
-    // deploy our contract to that node but once this function finishes
-    // the node is stopped. We want to have a node that keeps on
-    // running, so if we say the node is on the hardhat network, manually
-    // start a new one that won't shutdown after the contract is
-    // deployed.
-    await startPerpetualHardhatNode()
-  }
-
-  const inputsFactory = await ethers.getContractFactory('Inputs')
-  const inputs = await inputsFactory.deploy()
-  await inputs.deployed()
-
-  console.log(`Inputs deployed to ${inputs.address}`)
-}
-
-main().catch((error) => {
-  console.error(error)
-  process.exit(1)
-})
diff --git a/packages/contracts/src/Caller.sol b/packages/contracts/src/Caller.sol
index 7be30a3..d2e2293 100644
--- a/packages/contracts/src/Caller.sol
+++ b/packages/contracts/src/Caller.sol
@@ -1,11 +1,11 @@
 // SPDX-License-Identifier: MIT
 pragma solidity ^0.8.0;
 
-import './Inputs.sol';
+import {Inputs} from "./Inputs.sol";
 
 // Only used for testing
 contract Caller {
-    Inputs inputs;
+    Inputs internal inputs;
 
     constructor(address inputsContract) {
         inputs = Inputs(inputsContract);
diff --git a/packages/contracts/test/Inputs.t.sol b/packages/contracts/test/Inputs.t.sol
new file mode 100644
index 0000000..5aadcbd
--- /dev/null
+++ b/packages/contracts/test/Inputs.t.sol
@@ -0,0 +1,35 @@
+// SPDX-License-Identifier: UNLICENSED
+pragma solidity ^0.8.13;
+
+import {Test} from "forge-std/Test.sol";
+import {Inputs} from "../src/Inputs.sol";
+import {Caller} from "../src/Caller.sol";
+
+contract InputsTest is Test {
+    bytes private constant RANDOM_BYTES = "0x12345678907654321234567890987654321234567890987654";
+    address private constant BOB = address(0xb0b);
+    Inputs private inputs;
+    Caller private caller;
+
+    event BatchAppended(address sender);
+
+    function setUp() public {
+        inputs = new Inputs();
+        caller = new Caller(address(inputs));
+    }
+
+    function testEventBatchAppended() public {
+        // should emit BatchAppended event.
+        // expect address `bob` to be emitted.
+        vm.prank(BOB, BOB);
+        vm.expectEmit();
+        emit BatchAppended(BOB);
+        inputs.appendBatch(RANDOM_BYTES);
+    }
+
+    function testRevertCaller() public {
+        // should revert if called from a contract
+        vm.expectRevert();
+        caller.appendBatch(RANDOM_BYTES);
+    }
+}
diff --git a/packages/contracts/test/Inputs.test.ts b/packages/contracts/test/Inputs.test.ts
deleted file mode 100644
index 9f9cbde..0000000
--- a/packages/contracts/test/Inputs.test.ts
+++ /dev/null
@@ -1,33 +0,0 @@
-import { SignerWithAddress } from '@nomiclabs/hardhat-ethers/signers'
-import { assert, expect } from 'chai'
-import hre from 'hardhat'
-
-describe('Inputs', () => {
-  const randomBytes = '0x12345678907654321234567890987654321234567890987654'
-
-  async function getDeployer(): Promise<SignerWithAddress> {
-    const accounts = await hre.ethers.getSigners()
-    assert(accounts[0] !== undefined, 'First signer account is undefined')
-    return accounts[0]
-  }
-
-  it('Should emit BatchAppended event', async () => {
-    const deployer = await getDeployer()
-
-    const inputsFactory = await hre.ethers.getContractFactory('Inputs')
-    const inputs = await inputsFactory.deploy()
-
-    await expect(inputs.appendBatch(randomBytes))
-      .to.emit(inputs, 'BatchAppended')
-      .withArgs(await deployer.getAddress())
-  })
-
-  it('Should revert if called from another contract', async () => {
-    const inputsFactory = await hre.ethers.getContractFactory('Inputs')
-    const inputs = await inputsFactory.deploy()
-    const callerFactory = await hre.ethers.getContractFactory('Caller')
-    const caller = await callerFactory.deploy(inputs.address)
-
-    await expect(caller.appendBatch(randomBytes)).to.be.reverted
-  })
-})
diff --git a/packages/contracts/tsconfig.json b/packages/contracts/tsconfig.json
deleted file mode 100644
index 4082f16..0000000
--- a/packages/contracts/tsconfig.json
+++ /dev/null
@@ -1,3 +0,0 @@
-{
-  "extends": "../../tsconfig.json"
-}