Kucoin Chain DApps Integration

Welcome to Coin98 Extension Wallet Developer Guide. This documentation contains guides for developers to get started developing on Coin98 Extension Wallet.‌

To detect Coin98 Extension with Kucoin Chain

To detect whether your browser is running Coin98 Extension, please use:

if(window.coin98 || window.ethereum || window.ethereum?.isCoin98){
    console.log('Coin98 Extension is installed!');

Notice: Coin98 Extension Testnet is under development and not available now. The Coin98 Extension on Ethereum JavaScript provider API is specified by EIP-1193. Supportwindow.ethereum + window.binance and removal window.web3

To connect Coin98 Extension Wallet

To connect Coin98 Extension means to access the user's [blockchain - like Ethereum] account(s).

// Connect & get accounts
window.ethereum.request({method: 'eth_accounts'});
// Alias for connection
window.ethereum.request({method: 'eth_requestAccounts'});​
//Check if dapp connected

To disconnect Coin98 Extension Wallet

To disconnect Coin98 Extension, please use:


To experience functions

Once your account is connected, let's start experiencing more functions.‌

Get Current Account

return Promise<Array[String]>

  • If wallet can not be found, return [] instead of throw Error

window.binanceChain.request({ method: 'eth_accounts' }).then(accounts => {
  if (accounts[0]) {
    // Do something with accounts
  } else {
    // Wallet not found

Check wallet whether exists or not

return Promise<{data: Boolean}>

window.binanceChain.request({ method: 'has_wallet', params: ['kucoin']})
// Example
window.binanceChain.request({ method: 'has_wallet', params: ['kucoin'] }).then(() => {
  // Wallet Exists
}).catch(e => { 
  // Wallet not found

Sign Transaction

return: Promise<Signature | RPC: 2.0>

// Example Sign Transactionconst
const signature = window.binanceSmartChain.request({
    method: 'eth_sign',
    params: {
        "from": "string",
        "to": "string",
        "gas": "string",
        "gasPrice": "string",
        "value": "string",
        "data": "string",
        "nonce": "string"


return Promise<hash>

  method: 'eth_sendTransaction',
  params: [
      from: 'string',
      to: 'string',
      gas: 'string',
      gasPrice: 'string',
      value: 'string',
      data: 'string',
      nonce: 'string'

RPC Request

return Promise<binanceSmartChain RPC> Currently only support HTTP(s) method Reference: RPC Method

window.binanceChain.request({method: '<Your Method>', params: [args1,....]})

To handle events

List of events

Currently we only support some action event from wallet extension

window.binanceChain.on('event_name', callback);
window.binanceChain.on('close', () => window.location.reload());
window.binanceChain.on('accountsChanged', () => window.location.reload());


Receive when active account changed in Extension


Receive when active network changed in Extension


Receive when active chain changed in Extension


Receive when disconnect from Extension


Alias for disconnect event


on(event, callback)

Add event listener

off(event, callback)

Remove event listener

Last updated