@maticnetwork/maticjs

Matic SDK

This repository contains the maticjs client library. maticjs makes it easy for developers, who may not be deeply familiar with smart contract development, to interact with the various components of Matic Network.

This library will help developers to move assets from Ethereum chain to Matic chain, and withdraw from Matic to Ethereum using fraud proofs.

We will be improving this library to make all features available like Plasma Faster Exit, challenge exit, finalize exit and more.

Installation

NPM

---

$ npm install --save @maticnetwork/maticjs # or yarn add web3 maticjs

Direct <script> Include

---

Simply download dist/matic.js and include with a script tag. Matic will be registered as a global variable.

CDN

<script src="https://cdn.jsdelivr.net/npm/maticjs/dist/matic.js"></script>

Matic is also available on unpkg

Getting started

// Import Matic sdk
import Matic from '@maticnetwork/maticjs'

// Create sdk instance
const matic = new Matic({

  // Set Matic provider - string or provider instance
  // Example: 'https://testnet.matic.network' OR new Web3.providers.HttpProvider('http://localhost:8545')
  maticProvider: <web3-provider>,

  // Set Mainchain provider - string or provider instance
  // Example: 'https://kovan.infura.io' OR new Web3.providers.HttpProvider('http://localhost:8545')
  parentProvider: <web3-provider>,

  // Set rootchain contract. See below for more information
  rootChain: <root-contract-address>,

  // Set registry contract. See below for more information
  registry: <registry-contract-address>,

  // Set withdraw-manager Address. See below for more information
  withdrawManager: <withdraw-manager-address>,

  // Set deposit-manager Address. See below for more information
  depositManager: <deposit-manager-address>,
})

// init matic

matic.initialize()

// Set wallet
// Warning: Not-safe
//matic.wallet(<private-key>) // Use metamask provider or use WalletConnect provider instead.


// Approve ERC20 token for deposit
await matic.approveERC20TokensForDeposit(
  token,  // Token address,
  amount,  // Token amount for approval (in wei)
  options // transaction fields
)

// Deposit token into Matic chain. Remember to call `approveERC20TokensForDeposit` before
await matic.depositERC20ForUser(
  token,  // Token address
  user,   // User address (in most cases, this will be sender's address),
  amount,  // Token amount for deposit (in wei)
  options // transaction fields
)

// Transfer token on Matic
await matic.transferERC20Tokens(
  token,  // Token address
  user,   // Recipient address
  amount,  // Token amount
  options // transaction fields
)

// Initiate withdrawal of ERC20 from Matic and retrieve the Transaction id
await matic.startWithdraw(
  token, // Token address
  amount, // Token amount for withdraw (in wei)
  options // transaction fields
)

// Withdraw funds from the Matic chain using the Transaction id generated from the 'startWithdraw' method
// after header has been submitted to mainchain
await matic.withdraw(
  txId, // Transaction id generated from the 'startWithdraw' method
  options // transaction fields
)

How it works?

The flow for asset transfers on the Matic Network is as follows:

• User deposits crypto assets in Matic contract on mainchain
• Once deposited tokens get confirmed on the main chain, the corresponding tokens will get reflected on the Matic chain.
• The user can now transfer tokens to anyone they want instantly with negligible fees. Matic chain has faster blocks (approximately ~ 1 second). That way, the transfer will be done almost instantly.
• Once a user is ready, they can withdraw remaining tokens from the mainchain by establishing proof of remaining tokens on Root contract (contract deployed on Ethereum chain)

Contracts and addresses

Matic Testnet

• RPC endpoint host: https://testnet2.matic.network
• TEST childchain ERC20 token: 0xcc5de81d1af53dcb5d707b6b33a50f4ee46d983e

Ropsten testnet addresses

• TEST mainchain ERC20 token: 0x6b0b0e265321e788af11b6f1235012ae7b5a6808
• Root Contract: 0x60e2b19b9a87a3f37827f2c8c8306be718a5f9b4
• DepositManager Contract: 0x4072fab2a132bf98207cbfcd2c341adb904a67e9
• WithdrawManager Contract: 0x4ef2b60cdd4611fa0bc815792acc14de4c158d22

Faucet

Please write to [e-mail] to request TEST tokens for development purposes. We will soon have a faucet in place for automatic distribution of tokens for testing.

API

• new Matic()
• matic.approveERC20TokensForDeposit()
• matic.depositERC20ForUser()
• matic.transferERC20Tokens()
• matic.startWithdraw()
• matic.withdraw()

---

new Matic(options)

Creates Matic SDK instance with give options. It returns a MaticSDK object.

import Matic from "maticjs"

const matic = new Matic(options)

• options is simple Javascript object which can have following fields:
  • maticProvider can be string or Web3.providers instance. This provider must connect to Matic chain. Value can be anyone of following:
    • 'https://testnet2.matic.network'
    • new Web3.providers.HttpProvider('http://localhost:8545')
    • WalletConnect Provider instance
  • parentProvider can be string or Web3.providers instance. This provider must connect to Ethereum chain (testnet or mainchain). Value can be anyone of following:
    • 'https://ropsten.infura.io'
    • new Web3.providers.HttpProvider('http://localhost:8545')
    • WalletConnect Provider instance
  • rootChainAddress must be valid Ethereum contract address.
  • syncerUrl must be valid API host. MaticSDK uses this value to fetch receipt/tx proofs instead of getting whole block to client side.
  • watcherUrl must be valid API host. MaticSDK uses this value to fetch headerBlock info from mainchain and to find appropriate headerBlock for given blockNumber.
  • withdrawManagerAddress must be valid Ethereum contract address.
  • depositManagerAddress must be valid Ethereum contract address.

---

---

matic.approveERC20TokensForDeposit(token, amount, options)

Approves given amount of token to rootChainContract.

• token must be valid ERC20 token address
• amount must be token amount in wei (string, not in Number)
• options (optional) must be valid javascript object containing from, gasPrice, gasLimit, nonce, value, onTransactionHash, onReceipt or onError
  • from must be valid account address(required)
  • gasPrice same as Ethereum sendTransaction
  • gasLimit same as Ethereum sendTransaction
  • nonce same as Ethereum sendTransaction
  • nonce same as Ethereum sendTransaction
  • value contains ETH value. Same as Ethereum sendTransaction.
  • onTransactionHash must be function. This function will be called when transaction will be broadcasted.
  • onReceipt must be function. This function will be called when transaction will be included in block (when transaction gets confirmed)
  • onError must be function. This function will be called when sending transaction fails.

This returns Promise object, which will be fulfilled when transaction gets confirmed (when receipt is generated).

Example:

matic
  .approveERC20TokensForDeposit("0x718Ca123...", "1000000000000000000", {
    from: "0xABc578455..."
  })
  .on("onTransactionHash", txHash => {
    console.log("New transaction", txHash)
  })

---

matic.depositERC20ForUser(token, user, amount, options)

Deposit given amount of token with user user.

• token must be valid ERC20 token address
• user must be value account address
• amount must be token amount in wei (string, not in Number)
• options see more infomation here

This returns Promise object, which will be fulfilled when transaction gets confirmed (when receipt is generated).

Example:

const user = <your-address> or <any-account-address>

matic.depositToken('0x718Ca123...', user, '1000000000000000000', {
  from: '0xABc578455...'
})

---

matic.transferERC20Tokens(token, user, amount, options)

Transfer given amount of token to user.

• token must be valid ERC20 token address
• user must be value account address
• amount must be token amount in wei (string, not in Number)
• options see more infomation here
  • parent must be boolean value. For token transfer on Main chain, use parent: true

This returns Promise object, which will be fulfilled when transaction gets confirmed (when receipt is generated).

Example:

const user = <your-address> or <any-account-address>

matic.transferERC20Tokens('0x718Ca123...', user, '1000000000000000000', {
  from: '0xABc578455...',

  // For token transfer on Main network
  // parent: true
})

---

matic.startWithdraw(token, amount, options)

Start withdraw process with given amount for token.

• token must be valid ERC20 token address
• amount must be token amount in wei (string, not in Number)
• options see more infomation here

This returns Promise object, which will be fulfilled when transaction gets confirmed (when receipt is generated).

Example:

matic
  .startWithdraw("0x718Ca123...", "1000000000000000000", {
    from: "0xABc578455..."
  })
  .on("onTransactionHash", txHash => {
    console.log("Started withdraw process with txId", txHash)
  })

---

matic.withdraw(txId, options)

Withdraw tokens on mainchain using txId from startWithdraw method after header has been submitted to mainchain.

• txId must be valid tx hash
• options see more infomation here

This returns Promise object, which will be fulfilled when transaction gets confirmed (when receipt is generated).

Example:

matic.withdraw("0xabcd...789", {
  from: "0xABc578455..."
})

Support

Please write to [e-mail] for integration support. If you have any queries, feedback or feature requests, feel free to reach out to us on telegram: t.me/maticnetwork

License

MIT