Feature/auto mass payouts

.github/workflows/close-inactive-issue.yml

@@ -0,0 +1,22 @@
+name: Close inactive issues
+on:
+  schedule:
+    - cron: "30 1 * * *"
+
+jobs:
+  close-issues:
+    runs-on: ubuntu-latest
+    permissions:
+      issues: write
+      pull-requests: write
+    steps:
+      - uses: actions/stale@v9
+        with:
+          days-before-issue-stale: 30
+          days-before-issue-close: 14
+          stale-issue-label: "stale"
+          stale-issue-message: "This issue is stale because it has been open for 30 days with no activity."
+          close-issue-message: "This issue was closed because it has been inactive for 14 days since being marked as stale."
+          days-before-pr-stale: -1
+          days-before-pr-close: -1
+          repo-token: ${{ secrets.GITHUB_TOKEN }}

README.md

@@ -39,7 +39,7 @@ language, description, and tags to help you find what you need quickly.
 | [python/pancacke-swap](./python/pancake-swap-example)  | Python     | PancakeSwap integration example              | DeFi, DEX, BSC      |
 | [typescript/bnbchain-mcp](./typescript/bnbchain-mcp)   | TypeScript | AI-powered blockchain assistant using Claude | AI, BSC, MCP        |
 | [typescript/eliza-chatbot](./typescript/eliza-chatbot) | TypeScript | A chatbot example using Eliza plugin-bnb     | AI, BSC, opBNB      |
-
+| [javascript/auto-mass-payouts](./javascript/auto-mass-payouts) | Javascript | Auto-mass payouts with ERC20 token on BNB Chain using Hardhat and Node.js backend | BSCTestnet |
 More examples are coming soon—stay tuned for updates!
 
 ## How to Add a New Example

javascript/README.md

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+# Javascript Examples
+
+This directory contains all Javascript-based examples
+
+## Structure
+
+- Each example is organized into its own folder.

javascript/auto-mass-payouts/.gitignore

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+node_modules
+.env
+
+# Hardhat files
+/cache
+/artifacts
+
+# TypeChain files
+/typechain
+/typechain-types
+
+# solidity-coverage files
+/coverage
+/coverage.json
+
+# Hardhat Ignition default folder for deployments against a local node
+ignition/deployments/chain-31337

javascript/auto-mass-payouts/README.md

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+# Sample Hardhat Project
+
+This project demonstrates a basic Hardhat use case. It comes with a sample contract, a test for that contract, and a Hardhat Ignition module that deploys that contract.
+
+Try running some of the following tasks:
+
+```shell
+npx hardhat help
+npx hardhat test
+REPORT_GAS=true npx hardhat test
+npx hardhat node
+npx hardhat ignition deploy ./ignition/modules/Lock.js
+```

javascript/auto-mass-payouts/contracts/MassPayout.sol

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+// SPDX-License-Identifier: MIT
+pragma solidity ^0.8.20;
+
+interface IERC20 {
+    function transfer(address to, uint256 amount) external returns (bool);
+}
+
+contract MassPayout {
+    address public owner;
+
+    constructor() {
+        owner = msg.sender;
+    }
+
+    modifier onlyOwner() {
+        require(msg.sender == owner, "Not authorized");
+        _;
+    }
+
+    function payout(address token, address[] calldata recipients, uint256[] calldata amounts) external onlyOwner {
+        require(recipients.length == amounts.length, "Length mismatch");
+
+        for (uint256 i = 0; i < recipients.length; i++) {
+            IERC20(token).transfer(recipients[i], amounts[i]);
+        }
+    }
+}

javascript/auto-mass-payouts/contracts/MyToken.sol

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+// SPDX-License-Identifier: MIT
+pragma solidity ^0.8.20;
+
+import "@openzeppelin/contracts/token/ERC20/ERC20.sol";
+
+contract MyToken is ERC20 {
+    constructor(uint256 initialSupply) ERC20("My Token", "MTK") {
+        _mint(msg.sender, initialSupply * 10 ** decimals());
+    }
+}

javascript/auto-mass-payouts/hardhat.config.js

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+require("dotenv").config();
+require("@nomicfoundation/hardhat-toolbox");
+
+module.exports = {
+  solidity: "0.8.20",
+  networks: {
+    bsctest: {
+      url: process.env.BSCTEST_RPC,
+      accounts: [process.env.PRIVATE_KEY],
+    },
+  },
+};

javascript/auto-mass-payouts/index.js

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+require("dotenv").config();
+const express = require("express");
+const { ethers } = require("ethers");
+
+const app = express();
+const port = 3000;
+
+app.use(express.json());
+
+const provider = new ethers.JsonRpcProvider(process.env.BSCTEST_RPC);
+const wallet = new ethers.Wallet(process.env.PRIVATE_KEY, provider);
+
+// ✅ Lấy từ .env
+const payoutContractAddress = process.env.PAYOUT_CONTRACT;
+const tokenAddress = process.env.TOKEN_ADDRESS;
+
+const abi = [
+  "function payout(address token, address[] recipients, uint256[] amounts) external",
+];
+
+const payoutContract = new ethers.Contract(payoutContractAddress, abi, wallet);
+
+// POST /payout
+app.post("/payout", async (req, res) => {
+  try {
+    const { recipients, amounts } = req.body;
+
+    if (!recipients || !amounts || recipients.length !== amounts.length) {
+      return res.status(400).json({ error: "Invalid input" });
+    }
+
+    const parsedAmounts = amounts.map((amount) =>
+      ethers.parseUnits(amount.toString(), 18)
+    );
+    const tx = await payoutContract.payout(
+      tokenAddress,
+      recipients,
+      parsedAmounts
+    );
+    await tx.wait();
+
+    res.json({ status: "success", txHash: tx.hash });
+  } catch (err) {
+    console.error(err);
+    res.status(500).json({ error: err.message });
+  }
+});
+
+app.listen(port, () => {
+  console.log(`✅ Backend running at http://localhost:${port}`);
+});