Dev Guide V1 - Sei DApps Integration

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

Sei DApps Integration

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

To detect Fin Wallet Extension with Cosmos Base Chain

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

if (window.fin) {
  console.log('Fin Wallet Extension is installed!');
}// Some code

Notice: Fin Wallet Extension Testnet is under development and not available now.

To connect Fin Extension Wallet

To connect Fin Wallet Extension means to access the user's [blockchain - like Cosmos] account(s).

// Connect only
const connection = window.fin.cosmos('<chain: String>');
// Connect & get accounts
connection.request({ method: 'cosmos_accounts' });
// Check whether dapp connected or not
connection.isConnected();// Some code

Currently chains support: ['terra','cosmos']

To disconnect Fin Extension Wallet

To disconnect fin 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

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

Check wallet whether exists or not

return Promise<{data: Boolean}>

const hasWallet = connection.request({ method: 'has_wallet', params: ['<chain>'] });

Execute contract function

return: Promise<Hash>

const signature = connection.request({
  method: 'cosmos_execute',
  params: ['<contractAddres: string>', '<executeMsg: string>'],

// Example Execute Contract
let cw20Contract =
let execMsg =

const response = await connection.request({
  method: 'cosmos_execute',
  params: [cw20Contract, execMsg],

To handle events

List of events

Currently we only support some action event from wallet extension

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

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