diff --git a/src/ada/available-wallets.ts b/src/ada/available-wallets.ts
deleted file mode 100644
index 283e492..0000000
--- a/src/ada/available-wallets.ts
+++ /dev/null
@@ -1,8 +0,0 @@
-// TODO: Add klever mobile app source name
-export const availableWallets = ['nami'] as const
-
-export type AvailableWallet = typeof availableWallets[number]
-
-export enum CardanoWallet {
-  NAMI = 'nami',
-}
diff --git a/src/ada/types.ts b/src/ada/types.ts
deleted file mode 100644
index dc7ed8b..0000000
--- a/src/ada/types.ts
+++ /dev/null
@@ -1,7 +0,0 @@
-import type { AvailableWallet } from './available-wallets';
-
-export interface CardanoProviderProps {
-  wallet?: AvailableWallet
-}
-
-export type CardanoUsedAddress = string
diff --git a/src/cardano/available-wallets.ts b/src/cardano/available-wallets.ts
new file mode 100644
index 0000000..f0bad71
--- /dev/null
+++ b/src/cardano/available-wallets.ts
@@ -0,0 +1,16 @@
+// TODO: Add klever mobile app source name
+export const availableWallets = ['begin', 'eternl', 'flint', 'gerowallet', 'lace', 'nami', 'nufi', 'raywallet', 'yoroi'] as const
+
+export type AvailableWallet = typeof availableWallets[number]
+
+export enum CardanoWallet {
+  BEGIN = 'begin',
+  ETERNL = 'eternl',
+  FLINT = 'flint',
+  GERO_WALLET = 'gerowallet',
+  LACE = 'lace',
+  NAMI = 'nami',
+  NUFI = 'nufi',
+  RAY_WALLET = 'raywallet',
+  YOROI = 'yoroi',
+}
diff --git a/src/cardano/connect.spec.ts b/src/cardano/connect.spec.ts
new file mode 100644
index 0000000..c79901f
--- /dev/null
+++ b/src/cardano/connect.spec.ts
@@ -0,0 +1,31 @@
+import { NotInjectedError } from '@/errors';
+import { NoAvailableAccountsError } from '@/errors/no-accounts-available-error';
+import { NoProviderAvailableError } from '@/errors/no-provider-available-error';
+import { web3Window } from '@/types';
+import { beforeEach, describe, expect, it, vi } from 'vitest';
+import { connect } from './connect';
+
+describe('Connect wallet use case', () => {
+  const cardanoWebMock = {
+    yoroi: {
+      icon: 'data:image/svg',
+      name: 'yoroi',
+      apiVersion: '0.3.0',
+      enable: vi.fn(),
+      isEnabled: vi.fn(),
+    },
+  }
+  beforeEach(() => {
+    delete web3Window.cardano
+    web3Window.cardano = cardanoWebMock
+  })
+  it('should be able to throw error when window dont have Cardano object', async () => {
+    delete web3Window.cardano
+    await expect(connect()).rejects.toThrow(NotInjectedError)
+  })
+
+  it('should be able to throw error when have no providers', async () => {
+    delete web3Window.cardano.yoroi
+    await expect(connect()).rejects.toThrow(NoProviderAvailableError)
+  })
+})
diff --git a/src/ada/connect.ts b/src/cardano/connect.ts
similarity index 65%
rename from src/ada/connect.ts
rename to src/cardano/connect.ts
index de58df6..f9c3eea 100644
--- a/src/ada/connect.ts
+++ b/src/cardano/connect.ts
@@ -18,13 +18,18 @@ export async function connect(wallet?: string): Promise<CardanoUsedAddress[]> {
   }
 
   if (typeof injectedWallet === 'undefined')
+    // maybe impossible to hit this branch since Cardano API demands a wallet in the browser to be injected.
     throw new NoProviderAvailableError()
 
-  await web3Window.cardano[injectedWallet].enable()
-
-  const usedAddresses: CardanoUsedAddress[] = await web3Window.cardano.getUsedAddresses()
-  if (usedAddresses.length === 0)
-    throw new NoAvailableAccountsError()
-
-  return usedAddresses
+  try {
+    const api = await web3Window.cardano[injectedWallet].enable()
+    const usedAddresses: CardanoUsedAddress[] = await api.getUsedAddresses()
+    if (usedAddresses.length === 0)
+      throw new NoAvailableAccountsError()
+    return usedAddresses
+  }
+  catch (error) {
+    console.log(error)
+    return []
+  }
 }
diff --git a/src/cardano/getBalance.ts b/src/cardano/getBalance.ts
new file mode 100644
index 0000000..c587e5b
--- /dev/null
+++ b/src/cardano/getBalance.ts
@@ -0,0 +1,20 @@
+import { BalanceFetchError } from '@/errors/balance-fetch-error';
+import { EmptyAddressError } from '@/errors/empty-address-error';
+import type { ApiPromise } from './types';
+import type { Balance } from '@/types';
+
+export async function getBalance(api: ApiPromise, address: string): Promise<Balance> {
+  if (address.length === 0)
+    throw new EmptyAddressError()
+
+  try {
+    const accountBalance = await api.getBalance(address)
+    return {
+      free: accountBalance,
+      frozen: 0, // asset staking never gets "frozen" or "locked" in Cardano Network
+    }
+  }
+  catch (error) {
+    throw new BalanceFetchError(error as Error)
+  }
+}
diff --git a/src/ada/index.ts b/src/cardano/index.ts
similarity index 100%
rename from src/ada/index.ts
rename to src/cardano/index.ts
diff --git a/src/cardano/types.ts b/src/cardano/types.ts
new file mode 100644
index 0000000..82852ed
--- /dev/null
+++ b/src/cardano/types.ts
@@ -0,0 +1,11 @@
+import type { AvailableWallet } from './available-wallets';
+
+export type CardanoProviderProps = Record<AvailableWallet, any>;
+
+export type CardanoUsedAddress = string
+
+export interface ApiPromise {
+  getBalance: (address: string) => Promise<string>
+  getUsedAddresses: () => Promise<string[]>
+  getUnusedAddresses: () => Promise<string[]>
+}
diff --git a/src/index.ts b/src/index.ts
index 8fa2d24..4a2c188 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -1,4 +1,4 @@
-export * from './ada/index'
+export * from './cardano/index'
 export * from './networks'
 export * from './substrate/dot/index'
 export * from './substrate/ksm/index'
diff --git a/src/types.ts b/src/types.ts
index 2c4bbb1..27d4012 100644
--- a/src/types.ts
+++ b/src/types.ts
@@ -1,4 +1,4 @@
-import type { CardanoProviderProps } from './ada/types'
+import type { CardanoProviderProps } from './cardano/types'
 import type { NetworkKey } from './networks'
 import type { SubstrateProviderProps } from './substrate/types'
 
@@ -19,7 +19,7 @@ export type ProviderBuilderProps<T extends NetworkKey> = T extends 'dot' | 'ksm'
 // TODO: Add type and functions of injected providers
 export type Web3Window = {
   injectedWeb3: any
-  cardano: any
+  cardano?: any
 } & Window & typeof globalThis
 
 export const web3Window = (window as Web3Window)
diff --git a/src/web3-provider.ts b/src/web3-provider.ts
index 7ea3a8a..4c0c0df 100644
--- a/src/web3-provider.ts
+++ b/src/web3-provider.ts
@@ -1,5 +1,5 @@
-import { CardanoProvider } from './ada';
-import type { CardanoProviderProps } from './ada/types';
+import { CardanoProvider } from './cardano';
+import type { CardanoProviderProps } from './cardano/types';
 import type { ProviderEntity } from './entities/provider-entity';
 import { InvalidNetworkError } from './errors/invalid-network-error';
 import type { NetworkData, NetworkKey } from './networks';