diff --git a/package-lock.json b/package-lock.json
index 7f88c52..402e1a1 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -4312,9 +4312,9 @@
       }
     },
     "node_modules/caniuse-lite": {
-      "version": "1.0.30001600",
-      "resolved": "https://registry.npmjs.org/caniuse-lite/-/caniuse-lite-1.0.30001600.tgz",
-      "integrity": "sha512-+2S9/2JFhYmYaDpZvo0lKkfvuKIglrx68MwOBqMGHhQsNkLjB5xtc/TGoEPs+MxjSyN/72qer2g97nzR641mOQ==",
+      "version": "1.0.30001668",
+      "resolved": "https://registry.npmjs.org/caniuse-lite/-/caniuse-lite-1.0.30001668.tgz",
+      "integrity": "sha512-nWLrdxqCdblixUO+27JtGJJE/txpJlyUy5YN1u53wLZkP0emYCo5zgS6QYft7VUYR42LGgi/S5hdLZTrnyIddw==",
       "dev": true,
       "funding": [
         {
diff --git a/src/account/account.ts b/src/account/account.ts
index da5e718..75b8860 100644
--- a/src/account/account.ts
+++ b/src/account/account.ts
@@ -9,7 +9,7 @@ export class Account {
   public readonly rpcHelper: RpcHelper
   constructor(
     public readonly config: INetworkConfig,
-    public readonly signer: HDAccount,
+    public readonly signer?: HDAccount,
   ) {
     this.rpcHelper = new RpcHelper(config, signer)
   }
diff --git a/src/connections/index.ts b/src/connections/index.ts
index b7107f8..1e6589d 100644
--- a/src/connections/index.ts
+++ b/src/connections/index.ts
@@ -12,7 +12,7 @@ export class Connections {
   constructor(
     public readonly config: INetworkConfig,
     public rpcHelper: RpcHelper,
-    public signer: HDAccount,
+    public signer?: HDAccount,
   ) {}
 
   getTheContract() {
diff --git a/src/filesystem-changes/index.ts b/src/filesystem-changes/index.ts
index c537e72..a587e3c 100644
--- a/src/filesystem-changes/index.ts
+++ b/src/filesystem-changes/index.ts
@@ -12,12 +12,12 @@ export class FilesystemChanges {
   constructor(
     public readonly config: INetworkConfig,
     public rpcHelper: RpcHelper,
-    public signer: HDAccount,
+    public signer?: HDAccount,
   ) {}
 
   getTheContract() {
     return getContract({
-      address: this.config.filesystemChangesAddress as `0x${string}`,
+      address: this.config.filesystemChangesAddress,
       abi: abi as Abi,
       client: {
         public: this.rpcHelper.getPublicClient(),
@@ -39,7 +39,7 @@ export class FilesystemChanges {
     })
 
     return (await this.rpcHelper.getAccountClient()).sendTransaction({
-      to: this.config.filesystemChangesAddress as `0x${string}`,
+      to: this.config.filesystemChangesAddress,
       value: parseEther('0'),
       data,
     })
@@ -59,7 +59,7 @@ export class FilesystemChanges {
     })
 
     return (await this.rpcHelper.getAccountClient()).sendTransaction({
-      to: this.config.filesystemChangesAddress as `0x${string}`,
+      to: this.config.filesystemChangesAddress,
       value: parseEther('0'),
       data,
     })
@@ -79,7 +79,7 @@ export class FilesystemChanges {
     })
 
     return (await this.rpcHelper.getAccountClient()).sendTransaction({
-      to: this.config.filesystemChangesAddress as `0x${string}`,
+      to: this.config.filesystemChangesAddress,
       value: parseEther('0'),
       data,
     })
diff --git a/src/index.ts b/src/index.ts
index d95a255..ab949e3 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -18,7 +18,7 @@ const ViemUtils = { mnemonicToAccount, generateMnemonic, privateKeyToAccount, en
 export { Account, Config, Connections, FilesystemChanges, Gateway, Utils, Verification, FarcasterClient, ViemUtils }
 
 export class SDK {
-  public readonly eoaSigner: HDAccount
+  public readonly eoaSigner?: HDAccount
   public readonly account: Account
   public readonly gateway: Gateway
   public readonly connections: Connections
@@ -28,9 +28,12 @@ export class SDK {
 
   constructor(
     public readonly networkConfig: INetworkConfig,
-    mnemonic: string,
+    mnemonic?: string,
   ) {
-    this.eoaSigner = mnemonicToAccount(mnemonic)
+    if (mnemonic) {
+      this.eoaSigner = mnemonicToAccount(mnemonic)
+    }
+
     this.account = new Account(networkConfig, this.eoaSigner)
     this.gateway = new Gateway(networkConfig.appAuthUrl, networkConfig.verificationRpcUrl)
     this.connections = new Connections(networkConfig, this.account.rpcHelper, this.eoaSigner)
diff --git a/src/network-config/INetworkConfig.ts b/src/network-config/INetworkConfig.ts
index 5eb675f..1b6d821 100644
--- a/src/network-config/INetworkConfig.ts
+++ b/src/network-config/INetworkConfig.ts
@@ -25,11 +25,11 @@ export interface INetworkConfig {
   /**
    * Address of the filesystem changes contract
    */
-  filesystemChangesAddress: string
+  filesystemChangesAddress: `0x${string}`
   /**
-   * Address of the user verification contract
+   * Address of the user verification contract. Different for different sources and networks
    */
-  userVerificationAddress: string
+  userVerificationAddress?: string
   /**
    * URL of the app auth server
    */
diff --git a/src/network-config/base-mainnet-config.ts b/src/network-config/base-mainnet-config.ts
new file mode 100644
index 0000000..880d016
--- /dev/null
+++ b/src/network-config/base-mainnet-config.ts
@@ -0,0 +1,26 @@
+import { INetworkConfig } from './INetworkConfig'
+
+export const baseMainnetConfig: INetworkConfig = {
+  networkName: 'Base Mainnet',
+  chainId: 8453,
+  accountFactoryAddress: '0x00004EC70002a32400f8ae005A26081065620D20',
+  /**
+   * https://docs.alchemy.com/reference/eth-supportedentrypoints (v0.6.0)
+   */
+  entryPointAddress: '0x5ff137d4b0fdcd49dca30c7cf57e578a026d2789',
+  /**
+   * Create2 Address of Social Connections contract
+   */
+  socialConnectionsAddress: '0xB7C1C10A71d3C90f42351bec7E4BCd647C992743',
+  /**
+   * Create2 Address of Filesystem Changes contract
+   */
+  filesystemChangesAddress: '0x55043C8f3e8Ec55D2d60Acef83024F3b6da5AAf0',
+  appAuthUrl: 'https://dappy.in',
+  rpcUserOperationsUrl: 'https://base-mainnet.g.alchemy.com/v2/ublj-ZfkDCQxMSsTq-SWrGfHrfvGY58d',
+  userOperationsExplorerUrl: '',
+  simpleExplorerUrl: 'https://base.blockscout.com',
+  verificationRpcUrl: 'https://verify.dappykit.org',
+  farcasterAuthFrameUrl: 'https://farcaster-auth-frame.dappykit.org',
+  farcasterAuthApiUrl: 'https://farcaster-auth-api.dappykit.org',
+}
diff --git a/src/network-config/base-sepolia-config.ts b/src/network-config/base-sepolia-config.ts
new file mode 100644
index 0000000..7bba3a1
--- /dev/null
+++ b/src/network-config/base-sepolia-config.ts
@@ -0,0 +1,27 @@
+import { INetworkConfig } from './INetworkConfig'
+
+export const baseSepoliaConfig: INetworkConfig = {
+  networkName: 'Base Sepolia',
+  chainId: 84532,
+  /**
+   * The Simple Account offers a more basic implementation for wallet contracts.
+   * It is straightforward and easy to use, making it suitable for testing purposes.
+   * We recommend using Light Account in production.
+   *
+   * https://docs.alchemy.com/reference/factory-addresses#testnet-deployments
+   */
+  accountFactoryAddress: '0x9406Cc6185a346906296840746125a0E44976454',
+  /**
+   * https://docs.alchemy.com/reference/eth-supportedentrypoints
+   */
+  entryPointAddress: '0x5ff137d4b0fdcd49dca30c7cf57e578a026d2789',
+  socialConnectionsAddress: '0xB7C1C10A71d3C90f42351bec7E4BCd647C992743',
+  filesystemChangesAddress: '0x55043C8f3e8Ec55D2d60Acef83024F3b6da5AAf0',
+  appAuthUrl: 'https://dappy.in',
+  rpcUserOperationsUrl: 'https://base-sepolia.g.alchemy.com/v2/ublj-ZfkDCQxMSsTq-SWrGfHrfvGY58d',
+  userOperationsExplorerUrl: '',
+  simpleExplorerUrl: 'https://sepolia-explorer.base.org',
+  verificationRpcUrl: 'https://verify-api-test.dappykit.org',
+  farcasterAuthApiUrl: '',
+  farcasterAuthFrameUrl: '',
+}
diff --git a/src/network-config/fraxtal-holesky-config.ts b/src/network-config/fraxtal-holesky-config.ts
new file mode 100644
index 0000000..181f1ee
--- /dev/null
+++ b/src/network-config/fraxtal-holesky-config.ts
@@ -0,0 +1,27 @@
+import { INetworkConfig } from './INetworkConfig'
+
+export const fraxtalHoleskyConfig: INetworkConfig = {
+  networkName: 'Fraxtal Holesky',
+  chainId: 2522,
+  /**
+   * The Simple Account offers a more basic implementation for wallet contracts.
+   * It is straightforward and easy to use, making it suitable for testing purposes.
+   * We recommend using Light Account in production.
+   *
+   * https://docs.alchemy.com/reference/factory-addresses#testnet-deployments
+   */
+  accountFactoryAddress: '0x9406Cc6185a346906296840746125a0E44976454',
+  /**
+   * https://docs.alchemy.com/reference/eth-supportedentrypoints
+   */
+  entryPointAddress: '0x5ff137d4b0fdcd49dca30c7cf57e578a026d2789',
+  socialConnectionsAddress: '0xB7C1C10A71d3C90f42351bec7E4BCd647C992743',
+  filesystemChangesAddress: '0x55043C8f3e8Ec55D2d60Acef83024F3b6da5AAf0',
+  appAuthUrl: 'https://dappy.in',
+  rpcUserOperationsUrl: '',
+  userOperationsExplorerUrl: '',
+  simpleExplorerUrl: 'https://holesky.fraxscan.com/',
+  verificationRpcUrl: 'https://verify-api-test.dappykit.org',
+  farcasterAuthApiUrl: '',
+  farcasterAuthFrameUrl: '',
+}
diff --git a/src/network-config/fraxtal-mainnet-config.ts b/src/network-config/fraxtal-mainnet-config.ts
new file mode 100644
index 0000000..d03669d
--- /dev/null
+++ b/src/network-config/fraxtal-mainnet-config.ts
@@ -0,0 +1,26 @@
+import { INetworkConfig } from './INetworkConfig'
+
+export const fraxtalMainnetConfig: INetworkConfig = {
+  networkName: 'Fraxtal Mainnet',
+  chainId: 252,
+  accountFactoryAddress: '0x00004EC70002a32400f8ae005A26081065620D20',
+  /**
+   * https://docs.alchemy.com/reference/eth-supportedentrypoints (v0.6.0)
+   */
+  entryPointAddress: '0x5ff137d4b0fdcd49dca30c7cf57e578a026d2789',
+  /**
+   * Create2 Address of Social Connections contract
+   */
+  socialConnectionsAddress: '0xB7C1C10A71d3C90f42351bec7E4BCd647C992743',
+  /**
+   * Create2 Address of Filesystem Changes contract
+   */
+  filesystemChangesAddress: '0x55043C8f3e8Ec55D2d60Acef83024F3b6da5AAf0',
+  appAuthUrl: 'https://dappy.in',
+  rpcUserOperationsUrl: '',
+  userOperationsExplorerUrl: '',
+  simpleExplorerUrl: 'https://fraxscan.com/',
+  verificationRpcUrl: 'https://verify.dappykit.org',
+  farcasterAuthFrameUrl: 'https://farcaster-auth-frame.dappykit.org',
+  farcasterAuthApiUrl: 'https://farcaster-auth-api.dappykit.org',
+}
diff --git a/src/network-config/index.ts b/src/network-config/index.ts
index e16d299..57c4b5e 100644
--- a/src/network-config/index.ts
+++ b/src/network-config/index.ts
@@ -1,5 +1,21 @@
 import { optimismSepoliaConfig } from './optimism-sepolia-config'
 import { optimismMainnetConfig } from './optimism-mainnet-config'
+import { baseSepoliaConfig } from './base-sepolia-config'
+import { baseMainnetConfig } from './base-mainnet-config'
+import { modeMainnetConfig } from './mode-mainnet-config'
+import { modeSepoliaConfig } from './mode-sepolia-config'
+import { fraxtalHoleskyConfig } from './fraxtal-holesky-config'
+import { fraxtalMainnetConfig } from './fraxtal-mainnet-config'
 import { INetworkConfig } from './INetworkConfig'
 
-export { optimismSepoliaConfig, optimismMainnetConfig, INetworkConfig }
+export {
+  optimismSepoliaConfig,
+  optimismMainnetConfig,
+  baseSepoliaConfig,
+  baseMainnetConfig,
+  modeMainnetConfig,
+  modeSepoliaConfig,
+  fraxtalHoleskyConfig,
+  fraxtalMainnetConfig,
+  INetworkConfig,
+}
diff --git a/src/network-config/mode-mainnet-config.ts b/src/network-config/mode-mainnet-config.ts
new file mode 100644
index 0000000..820e5d4
--- /dev/null
+++ b/src/network-config/mode-mainnet-config.ts
@@ -0,0 +1,26 @@
+import { INetworkConfig } from './INetworkConfig'
+
+export const modeMainnetConfig: INetworkConfig = {
+  networkName: 'Mode Mainnet',
+  chainId: 34443,
+  accountFactoryAddress: '0x00004EC70002a32400f8ae005A26081065620D20',
+  /**
+   * https://docs.alchemy.com/reference/eth-supportedentrypoints (v0.6.0)
+   */
+  entryPointAddress: '0x5ff137d4b0fdcd49dca30c7cf57e578a026d2789',
+  /**
+   * Create2 Address of Social Connections contract
+   */
+  socialConnectionsAddress: '0xB7C1C10A71d3C90f42351bec7E4BCd647C992743',
+  /**
+   * Create2 Address of Filesystem Changes contract
+   */
+  filesystemChangesAddress: '0x55043C8f3e8Ec55D2d60Acef83024F3b6da5AAf0',
+  appAuthUrl: 'https://dappy.in',
+  rpcUserOperationsUrl: '',
+  userOperationsExplorerUrl: '',
+  simpleExplorerUrl: 'https://explorer.mode.network',
+  verificationRpcUrl: 'https://verify.dappykit.org',
+  farcasterAuthFrameUrl: 'https://farcaster-auth-frame.dappykit.org',
+  farcasterAuthApiUrl: 'https://farcaster-auth-api.dappykit.org',
+}
diff --git a/src/network-config/mode-sepolia-config.ts b/src/network-config/mode-sepolia-config.ts
new file mode 100644
index 0000000..e85d394
--- /dev/null
+++ b/src/network-config/mode-sepolia-config.ts
@@ -0,0 +1,27 @@
+import { INetworkConfig } from './INetworkConfig'
+
+export const modeSepoliaConfig: INetworkConfig = {
+  networkName: 'Mode Sepolia',
+  chainId: 919,
+  /**
+   * The Simple Account offers a more basic implementation for wallet contracts.
+   * It is straightforward and easy to use, making it suitable for testing purposes.
+   * We recommend using Light Account in production.
+   *
+   * https://docs.alchemy.com/reference/factory-addresses#testnet-deployments
+   */
+  accountFactoryAddress: '0x9406Cc6185a346906296840746125a0E44976454',
+  /**
+   * https://docs.alchemy.com/reference/eth-supportedentrypoints
+   */
+  entryPointAddress: '0x5ff137d4b0fdcd49dca30c7cf57e578a026d2789',
+  socialConnectionsAddress: '0xB7C1C10A71d3C90f42351bec7E4BCd647C992743',
+  filesystemChangesAddress: '0x55043C8f3e8Ec55D2d60Acef83024F3b6da5AAf0',
+  appAuthUrl: 'https://dappy.in',
+  rpcUserOperationsUrl: '',
+  userOperationsExplorerUrl: '',
+  simpleExplorerUrl: 'https://sepolia.explorer.mode.network/',
+  verificationRpcUrl: 'https://verify-api-test.dappykit.org',
+  farcasterAuthApiUrl: '',
+  farcasterAuthFrameUrl: '',
+}
diff --git a/src/network-config/optimism-mainnet-config.ts b/src/network-config/optimism-mainnet-config.ts
index 0081d14..e277e17 100644
--- a/src/network-config/optimism-mainnet-config.ts
+++ b/src/network-config/optimism-mainnet-config.ts
@@ -21,9 +21,14 @@ export const optimismMainnetConfig: INetworkConfig = {
    * https://docs.alchemy.com/reference/eth-supportedentrypoints (v0.6.0)
    */
   entryPointAddress: '0x5ff137d4b0fdcd49dca30c7cf57e578a026d2789',
-  socialConnectionsAddress: '0xD8FC858221428B6b8ce304CE7aF1E838067Ea806',
-  filesystemChangesAddress: '0x204B8968E70084cDCBad327614334F1D7553aaF2',
-  userVerificationAddress: '0xBA44aaa2809931401ec099D798A5376cd678a12a',
+  /**
+   * Create2 Address of Social Connections contract
+   */
+  socialConnectionsAddress: '0xB7C1C10A71d3C90f42351bec7E4BCd647C992743',
+  /**
+   * Create2 Address of Filesystem Changes contract
+   */
+  filesystemChangesAddress: '0x55043C8f3e8Ec55D2d60Acef83024F3b6da5AAf0',
   appAuthUrl: 'https://dappy.in',
   rpcUserOperationsUrl: 'https://opt-mainnet.g.alchemy.com/v2/ublj-ZfkDCQxMSsTq-SWrGfHrfvGY58d',
   userOperationsExplorerUrl: '',
diff --git a/src/network-config/optimism-sepolia-config.ts b/src/network-config/optimism-sepolia-config.ts
index 0f0511f..9995288 100644
--- a/src/network-config/optimism-sepolia-config.ts
+++ b/src/network-config/optimism-sepolia-config.ts
@@ -18,9 +18,8 @@ export const optimismSepoliaConfig: INetworkConfig = {
    * https://docs.alchemy.com/reference/eth-supportedentrypoints
    */
   entryPointAddress: '0x5ff137d4b0fdcd49dca30c7cf57e578a026d2789',
-  socialConnectionsAddress: '0xD8FC858221428B6b8ce304CE7aF1E838067Ea806',
-  filesystemChangesAddress: '0x204B8968E70084cDCBad327614334F1D7553aaF2',
-  userVerificationAddress: '0xBA44aaa2809931401ec099D798A5376cd678a12a',
+  socialConnectionsAddress: '0xB7C1C10A71d3C90f42351bec7E4BCd647C992743',
+  filesystemChangesAddress: '0x55043C8f3e8Ec55D2d60Acef83024F3b6da5AAf0',
   appAuthUrl: 'https://dappy.in',
   rpcUserOperationsUrl: 'https://opt-sepolia.g.alchemy.com/v2/vzozB27YgXBN9bXvQh5_AeyWVjDmfqGF',
   userOperationsExplorerUrl: '',
diff --git a/src/rpc-helper/index.ts b/src/rpc-helper/index.ts
index 1445c27..cdbc9de 100644
--- a/src/rpc-helper/index.ts
+++ b/src/rpc-helper/index.ts
@@ -5,6 +5,7 @@ import { LightSmartAccount, signerToLightSmartAccount } from 'permissionless/acc
 import { createSmartAccountClient, ENTRYPOINT_ADDRESS_V06, SmartAccountClient } from 'permissionless'
 import { ENTRYPOINT_ADDRESS_V06_TYPE } from 'permissionless/types'
 import { getChain } from '../utils/chain'
+import { assertNotEmptySigner } from '../connections/utils'
 
 export type LightSmartAccountType = LightSmartAccount<ENTRYPOINT_ADDRESS_V06_TYPE, HttpTransport, Chain>
 
@@ -17,7 +18,7 @@ export class RpcHelper {
 
   constructor(
     public readonly config: INetworkConfig,
-    public readonly eoaSigner: HDAccount,
+    public readonly eoaSigner?: HDAccount,
   ) {}
 
   /**
@@ -34,6 +35,8 @@ export class RpcHelper {
    * Get smart account instance. With ability to sign transactions.
    */
   async getAccount(): Promise<LightSmartAccountType> {
+    assertNotEmptySigner(this.eoaSigner)
+
     if (!this.account) {
       this.account = await signerToLightSmartAccount(this.getPublicClient(), {
         signer: this.eoaSigner,
diff --git a/test/manual/defaultScenario.js b/test/manual/defaultScenario.js
index 4c6ac04..5dc10d4 100644
--- a/test/manual/defaultScenario.js
+++ b/test/manual/defaultScenario.js
@@ -1,20 +1,20 @@
 const { generateMnemonic, english } = window.DappyKit.ViemUtils
-const mnemonic = generateMnemonic(english)
 const optimismMainnetConfig = window.DappyKit.Config.optimismMainnetConfig
-const optimismSepoliaConfig = window.DappyKit.Config.optimismSepoliaConfig
+const optimismSepoliaConfig = {
+  ...window.DappyKit.Config.optimismSepoliaConfig,
+  socialConnectionsAddress: '0xD8FC858221428B6b8ce304CE7aF1E838067Ea806',
+  filesystemChangesAddress: '0x204B8968E70084cDCBad327614334F1D7553aaF2',
+}
 
 // example how to create SDK instance with mnemonic
-const sdkTestnet = new window.DappyKit.SDK(optimismSepoliaConfig, mnemonic)
+const sdkTestnet = new window.DappyKit.SDK(optimismSepoliaConfig)
 
 // example how to create SDK instance with mnemonic
-const sdkMainnet = new window.DappyKit.SDK(optimismMainnetConfig, mnemonic)
+const sdkMainnet = new window.DappyKit.SDK(optimismMainnetConfig)
 
 async function defaultScenario() {
   const verificationContractAddress = '0x721462E34DCC00F8Bd0f0cD07762cfd482a0Fcb4'
 
-  // eslint-disable-next-line no-console
-  console.log('Smart Account address', await sdkTestnet.account.getAddress())
-
   // eslint-disable-next-line no-console
   console.log(
     'user connection multihash',
diff --git a/test/optimism-sepolia/verification.test.ts b/test/optimism-sepolia/verification.test.ts
index c7106f8..615ef8e 100644
--- a/test/optimism-sepolia/verification.test.ts
+++ b/test/optimism-sepolia/verification.test.ts
@@ -27,6 +27,8 @@ describe('Optimism Sepolia Verification', () => {
   })
 
   it(`should check if the token is expired`, async () => {
+    // to prolong the token, go to https://sepolia-optimism.etherscan.io/address/0x721462E34DCC00F8Bd0f0cD07762cfd482a0Fcb4#writeContract
+    // with 0xaE70aEb668D3f6De045765657999957388CDF025, call "extendTokenExpiry" with the tokenId received using "getTokenId"
     const sdk = await createSdk(optimismSepoliaConfig, Wallet.createRandom())
     const tokenId = await sdk.verification.getTokenId(verifiedAddress, verificationContractAddress)
     expect(await sdk.verification.isTokenExpired(tokenId, verificationContractAddress)).toEqual(false)