Frameworks and Tools You Can Use

1. Sui CLI + Localnet / Testnet Integration

You can script a faucet using the Sui CLI.

It lets you:

Publish your custom token Move package.

Create mint() or distribute() functions.

Send tokens on request via a script.

Example:

sui client call
--package $PACKAGE_ID
--module faucet
--function mint_to
--args <recipient_address>
--gas-budget 5000000

---

2. Node.js/TypeScript Backend with @mysten/sui.js

Use the @mysten/sui.js SDK to write a simple backend (Express or Fastify).

Connect to a funded account (or use keyless wallet).

Trigger token mint/transfer based on frontend requests.

Example Faucet Endpoint:

// Node.js (Express) app.post("/drip", async (req, res) => { const txb = new TransactionBlock(); txb.moveCall({ target: ${PACKAGE_ID}::faucet::mint_to, arguments: [ txb.pure(req.body.address), txb.pure("1000000"), // 1M token units ], }); const result = await signer.signAndExecuteTransactionBlock({ transactionBlock: txb }); res.send({ tx: result }); });

---

3. Faucet Smart Contract (Move Module)

Create a custom Move module that:

Owns a Treasury object with all minted tokens.

Implements a drip function with cooldowns or auth checks.

Sample Move Structure:

public entry fun request_tokens(account: &signer, treasury: &mut Treasury, amount: u64) { assert!(amount <= treasury.available_tokens, E_TOO_MUCH); transfer_custom_token(treasury, account_address(account), amount); }

Best Practice: Protect with cooldown_map: Table<address, u64> to avoid spamming.

---

4. Frontend Integration

Use frameworks like:

Next.js or Vite with @mysten/sui.js

WalletKit or sui-wallet-adapter to integrate Sui Wallets

CAPTCHA or wallet signature as spam protection

Building a Testnet Faucet for custom tokens is a great way to provide users with test tokens to interact with your blockchain or dApp. Here's a guide on how to approach building such a faucet, along with some frameworks and tools you can use.

Steps to Build a Testnet Faucet for Custom Tokens

1. Set Up a Testnet Node

• First, you'll need a Testnet environment (either public or local). For example, you can use Sui Testnet, Ethereum Testnets (Rinkeby, Goerli, etc.), or Custom blockchain testnets.
• Ensure your testnet node is fully synced, and you have access to interact with it programmatically (via SDK or RPC).

2. Token Smart Contract

• Deploy your custom token smart contract on the Testnet.

• Ensure the contract includes standard functions such as mint or transfer that the faucet will call to distribute tokens.

  • ERC20 for Ethereum-like chains (for standard tokens).
  • Custom Move module for Sui if you're working on the Sui blockchain.

• Example function (for Ethereum):

  function mint(address to, uint256 amount) public onlyOwner {
      _mint(to, amount);
  }
  

3. Create a Faucet Backend

The faucet's backend should handle requests for tokens, verify the user, and interact with the blockchain.

• Programming Language: Use any backend framework like Node.js, Python, or Go.
• Web3 Library: Use Web3 libraries like Ethers.js (for Ethereum), Sui SDK (for Sui), or web3.py (for Python-based Ethereum interaction).

Backend Structure:

• API endpoint: A route that accepts requests to send tokens.

  • Endpoint: POST /request-tokens
  • Parameters: Address, amount (optional), captcha validation.

• Blockchain Interaction: The backend will call the mint or transfer method in your smart contract to send tokens.

  • For Ethereum, use ethers.js to interact with the smart contract.
  • For Sui, use the Sui SDK to mint the token.

Example (Node.js with ethers.js for Ethereum-based tokens):

const { ethers } = require("ethers");

async function sendTokens(address, amount) {
  const provider = new ethers.JsonRpcProvider("https://rinkeby.infura.io/v3/YOUR_INFURA_KEY");
  const wallet = new ethers.Wallet("YOUR_PRIVATE_KEY", provider);
  const tokenContract = new ethers.Contract("TOKEN_CONTRACT_ADDRESS", [
    "function mint(address to, uint256 amount) public"
  ], wallet);

  // Sending tokens
  await tokenContract.mint(address, ethers.utils.parseUnits(amount.toString(), 18));
}

4. Frontend Interface

• A simple web interface where users can request tokens by entering their wallet address.

• Features:

  • Input field for wallet address.
  • Optionally, you can add CAPTCHA verification to prevent abuse.
  • Display a success or failure message when tokens are sent.

Example (Frontend):

<input type="text" id="walletAddress" placeholder="Enter wallet address">
<button onclick="requestTokens()">Request Tokens</button>

<script>
  async function requestTokens() {
    const address = document.getElementById("walletAddress").value;
    if (!address) return alert("Please enter an address");

    const response = await fetch('/request-tokens', {
      method: 'POST',
      body: JSON.stringify({ address: address }),
      headers: {
        'Content-Type': 'application/json'
      }
    });
    
    const result = await response.json();
    alert(result.message);
  }
</script>

5. Security and Anti-abuse Measures

• Rate Limiting: Limit the number of requests a user can make in a specific time window to avoid abuse.
• Captcha Integration: To prevent bots from using the faucet excessively, integrate a CAPTCHA (e.g., Google reCAPTCHA) to validate users.
• IP Address Logging: Track IP addresses to limit faucet use to avoid spamming from the same user.

6. Deploy the Faucet

• Web Server: Use any backend hosting platform (e.g., Heroku, Vercel, AWS) to deploy the faucet.
• Blockchain node connection: Ensure the backend is connected to the appropriate Testnet or local node where the tokens are deployed.

Frameworks/Tools to Help You Build the Faucet

1. Faucet Frameworks for Ethereum-based Chains:

   • Faucet Framework (for Ethereum): https://github.com/ethereum/faucet provides a simple implementation of a faucet that can be adapted to your needs.
   • FaucetDapp (for Ethereum): A popular open-source faucet built for Ethereum.
   • Alchemy SDK (for Ethereum): Use Alchemy’s Web3 API to easily build a faucet and interact with your smart contracts.

2. For Sui Blockchain:

   • Sui SDK: You can use the official Sui SDK to create backend services that interact with the Sui blockchain, and mint tokens.
   • Sui’s JSON-RPC API: For custom handling, interact with Sui Testnet directly via the JSON-RPC endpoints to mint tokens.

3. Frontend Frameworks:

   • React.js or Vue.js: If you’re building a more interactive frontend, consider using frameworks like React or Vue.js to manage state and user interaction.
   • Next.js or Nuxt.js: These frameworks can help you create server-side rendered pages for a seamless user experience.

4. Other Libraries:

   • ethers.js or web3.js: These libraries allow you to interact with Ethereum-based tokens.
   • Sui SDK: For Sui, you'll use the official SDK to send transactions and mint custom tokens.

Conclusion

Building a Testnet Faucet for custom tokens involves setting up a backend to interact with your token's smart contract, building a frontend for user interaction, and securing the faucet with anti-abuse mechanisms. Frameworks like ethers.js, Sui SDK, and frontend tools like React or Vue.js can help you streamline the process. Make sure to deploy it securely with CAPTCHA verification and rate limiting to prevent abuse.

Let me know if you'd like more detailed examples or help with specific parts of the implementation!

To build a testnet for custom tokens on Sui, you mainly work with Sui’s Move language and supporting frameworks. The key tools and frameworks are: • Sui Move Framework – Core library provided by Mysten Labs for writing and deploying custom token logic (fungible and non‑fungible). It includes modules for minting, transferring, burning, and managing supply on testnets. • Sui CLI + Localnet/Testnet Tools – Lets you spin up a local Sui network or connect to the official Sui testnet. You can deploy your token module, mint test tokens, and simulate transactions before mainnet deployment. • Sui SDKs (TypeScript, Rust, Python) – For integrating your token with dApps or test scripts; useful if you need programmatic control or automated testing of token behavior. • Sui Devnet Faucet – Provides free SUI test tokens needed to pay gas fees for deploying and testing your token contracts. • Move Playground / Sui Move Analyzer – Web and VS Code tools for writing, linting, and debugging Move code quickly without full local setup.

Together, these frameworks let you define your token in Move, deploy it to Sui testnet, and test transfers, staking, or dApp interactions end‑to‑end.

To build a Testnet faucet for custom tokens on the Sui network, you’ll need to create a backend service that can receive a wallet address and send out a small amount of your custom token to that address on Sui Testnet. While there isn't a plug-and-play "faucet framework" for Sui yet, you can use lightweight web frameworks like Express.js (Node.js) or FastAPI (Python) to build your own faucet service, and then use the Sui TypeScript SDK or Sui CLI to send the token transactions. Here’s the best-practice architecture:

Use a backend wallet (hot wallet) that holds your custom test token. Expose a POST endpoint like /request-token where users submit their Sui address. When the request comes in, verify and rate-limit (e.g., 1 request per 24 hours per IP). Use the Sui SDK to construct and sign a transaction transferring your custom token to the user. Log and emit faucet events to track usage. Basic Node.js Stack:

express – web server @mysten/sui.js – to interact with Sui Testnet rate-limiter-flexible – to prevent abuse Sample SDK usage:

import { SuiClient, getFullnodeUrl, TransactionBlock } from "@mysten/sui.js/client";

const client = new SuiClient({ url: getFullnodeUrl("testnet") }); const tx = new TransactionBlock();

tx.transferObjects( [tx.object('0xYourCustomTokenObjectId')], tx.pure('0xRecipientAddress') );

const result = await client.signAndExecuteTransactionBlock({ signer: yourHotWallet, transactionBlock: tx, }); 

To build a Testnet faucet for custom tokens on the Sui network, you’ll need to create a backend service that can receive a wallet address and send out a small amount of your custom token to that address on Sui Testnet. While there isn't a plug-and-play "faucet framework" for Sui yet, you can use lightweight web frameworks like Express.js (Node.js) or FastAPI (Python) to build your own faucet service, and then use the Sui TypeScript SDK or Sui CLI to send the token transactions.

Here’s the best-practice architecture:

• Use a backend wallet (hot wallet) that holds your custom test token.
• Expose a POST endpoint like /request-token where users submit their Sui address.
• When the request comes in, verify and rate-limit (e.g., 1 request per 24 hours per IP).
• Use the Sui SDK to construct and sign a transaction transferring your custom token to the user.
• Log and emit faucet events to track usage.

Basic Node.js Stack:

• express – web server
• @mysten/sui.js – to interact with Sui Testnet
• rate-limiter-flexible – to prevent abuse

Sample SDK usage:

import { SuiClient, getFullnodeUrl, TransactionBlock } from "@mysten/sui.js/client";

const client = new SuiClient({ url: getFullnodeUrl("testnet") });
const tx = new TransactionBlock();

tx.transferObjects(
  [tx.object('0xYourCustomTokenObjectId')],
  tx.pure('0xRecipientAddress')
);

const result = await client.signAndExecuteTransactionBlock({
  signer: yourHotWallet,
  transactionBlock: tx,
});

Security Tips:

• Don’t expose your hot wallet’s private key in the frontend.
• Use .env to manage secrets.
• Add CAPTCHA or wallet signature verification to prevent bots.

You can host the faucet on a simple frontend like Vercel/Netlify and link it to your backend faucet API.

To learn more about sending tokens via SDK: https://docs.sui.io/tools/sdk-reference/ts-sdk

To build a Testnet faucet for custom tokens on the Sui network, you’ll need to create a backend service that can receive a wallet address and send out a small amount of your custom token to that address on Sui Testnet. While there isn't a plug-and-play "faucet framework" for Sui yet, you can use lightweight web frameworks like Express.js (Node.js) or FastAPI (Python) to build your own faucet service, and then use the Sui TypeScript SDK or Sui CLI to send the token transactions.

Here’s the best-practice architecture:

Use a backend wallet (hot wallet) that holds your custom test token. Expose a POST endpoint like /request-token where users submit their Sui address. When the request comes in, verify and rate-limit (e.g., 1 request per 24 hours per IP). Use the Sui SDK to construct and sign a transaction transferring your custom token to the user. Log and emit faucet events to track usage. Basic Node.js Stack:

express – web server @mysten/sui.js – to interact with Sui Testnet rate-limiter-flexible – to prevent abuse Sample SDK usage:

import { SuiClient, getFullnodeUrl, TransactionBlock } from "@mysten/sui.js/client";

const client = new SuiClient({ url: getFullnodeUrl("testnet") }); const tx = new TransactionBlock();

tx.transferObjects( [tx.object('0xYourCustomTokenObjectId')], tx.pure('0xRecipientAddress') );

const result = await client.signAndExecuteTransactionBlock({ signer: yourHotWallet, transactionBlock: tx, }); Security Tips:

Don’t expose your hot wallet’s private key in the frontend. Use .env to manage secrets. Add CAPTCHA or wallet signature verification to prevent bots. You can host the faucet on a simple frontend like Vercel/Netlify and link it to your backend faucet API.

To learn more about sending tokens via SDK: https://docs.sui.io/tools/sdk-reference/ts-sdk