Polygon 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 Polygon
To detect whether your browser is running Coin98 Extension, please use:
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if(window.coin98 || window.ethereum || window.ethereum?.isCoin98){
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    console.log('Coin98 Extension is installed!');
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}
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Notice: Coin98 Extension Testnet is under development and not available now. The Coin98 Extension on Ethereum JavaScript provider API is specified by EIP-1193. Support window.ethereum only and removal window.web3
​
To connect Coin98 Extension Wallet
To connect Coin98 Extension means to access the user's [blockchain - like Ethereum] account(s).
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// Connect & get accounts
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window.ethereum.request({method: 'eth_accounts'});
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// Alias for connection
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window.ethereum.request({method: 'eth_requestAccounts'});​
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//Check if dapp connected
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window.ethereum.isConnected();
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​
To disconnect Coin98 Extension Wallet
To disconnect Coin98 Extension, please use:
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window.ethereum.disconnect()
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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
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window.ethereum.request({ method: 'eth_accounts' }).then(accounts => {
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  if (accounts[0]) {
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    // Do something with accounts
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  } else {
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    // Wallet not found
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  }
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})
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Check wallet whether exists or not
return Promise<{data: Boolean}>
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window.ethereum.request({ method: 'has_wallet', params: ['eth'] })
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// Example
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window.ethereum.request({ method: 'has_wallet', params: ['eth'] }).then(() => {
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  // Wallet Exists
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}).catch(e => { 
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  // Wallet not found
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})
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Sign
return: Promise<Signature | RPC: 2.0>
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// Example Sign 
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const signature = window.ethereum.request({
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    method: 'eth_sign',
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    params: [
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     {
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        "to": "string",
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        "gas": "string",
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        "gasPrice": "string",
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        "value": "string",
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        "data": "string",
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        "nonce": "string"
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     }
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    ]
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});
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Transfer
return Promise<hash>
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window.ethereum.request({
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  method: 'eth_sendTransaction',
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  params: [
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    {
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      'to': 'string',
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      'gas': 'string',
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      'gasPrice': 'string',
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      'value': 'string',
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      'data': 'string',
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      'nonce': 'string'
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    }
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  ]
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})
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RPC Request
return Promise<Ethereum RPC> Currently only support HTTP(s) method Reference: RPC Method​
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window.ethereum.request({method: '<Your Method>', params: [args1,....]})
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​
To handle events
List of events
Currently we only support some action event from wallet extension
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window.ethereum.on('event_name', callback);
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​//Example
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window.ethereum.on('close', () => window.location.reload());
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window.ethereum.on('accountsChanged', () => window.location.reload());
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Events
Trigger
accountsChanged
Receive when active account changed in Extension
networkChanged
Receive when active network changed in Extension
chainChanged
Receive when active chain changed in Extension
disconnect
Receive when disconnect from Extension
close
Alias for disconnect event
Method
Description
on(event, callback)
Add event listener
off(event, callback)
Remove event listener

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TomoChain DApps Integration

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Contents

To detect Coin98 Extension with Polygon

To connect Coin98 Extension Wallet

To disconnect Coin98 Extension Wallet

To experience functions

Get Current Account

Check wallet whether exists or not