diff --git a/Sources/SafariWalletCore/Extensions/String.swift b/Sources/SafariWalletCore/Extensions/String.swift
index 1340afb..4746777 100644
--- a/Sources/SafariWalletCore/Extensions/String.swift
+++ b/Sources/SafariWalletCore/Extensions/String.swift
@@ -26,4 +26,9 @@ extension String {
     public func toHexString(uppercase: Bool = false, prefix: String? = nil) -> String {
         return unicodeScalars.map { prefix ?? "" + .init($0.value, radix: 16, uppercase: uppercase) }.joined()
     }
+
+    public func toJSON() -> Any? {
+        guard let data = self.data(using: .utf8, allowLossyConversion: false) else { return nil }
+        return try? JSONSerialization.jsonObject(with: data, options: .mutableContainers)
+    }
 }
diff --git a/Sources/SafariWalletCore/Extensions/Wallet.swift b/Sources/SafariWalletCore/Extensions/Wallet.swift
index 9892f98..7d4b71d 100644
--- a/Sources/SafariWalletCore/Extensions/Wallet.swift
+++ b/Sources/SafariWalletCore/Extensions/Wallet.swift
@@ -18,7 +18,7 @@ extension Wallet {
     }
        
     public convenience init(mnemonic: String, language: BIP39Wordlist = .english, network: Network = .ethereum) throws {
-        guard let seed = try BIP39(mnemonic: mnemonic.components(separatedBy: " ")).seed() else { throw MEWwalletKit.WalletError.emptySeed }
+        guard let seed = try BIP39(mnemonic: mnemonic).seed() else { throw MEWwalletKit.WalletError.emptySeed }
         try self.init(seed: seed, network: network)
     }
     
diff --git a/Sources/SafariWalletCore/Models/Account.swift b/Sources/SafariWalletCore/Models/Account.swift
index 1e4a814..bfe3bee 100644
--- a/Sources/SafariWalletCore/Models/Account.swift
+++ b/Sources/SafariWalletCore/Models/Account.swift
@@ -10,7 +10,7 @@ import MEWwalletKit
 
 public struct Account {
     
-    public let addresss: Address
+    public let address: Address
     public let publicKey: PublicKeyEth1
     private let privateKey: PrivateKeyEth1
     public let wallet: String
@@ -20,12 +20,20 @@ public struct Account {
         self.privateKey = privateKey
         self.publicKey = try privateKey.publicKey()
         guard let address = privateKey.address() else { throw WalletCoreError.addressGenerationError }
-        self.addresss = address
+        self.address = address
         self.wallet = wallet
         self.derivationpath = derivationpath
     }
     
     public func sign(hexString: String) throws -> String {
+        let data = Data(hex: hexString)
+        guard let signedMessage = data.sign(key: privateKey, leadingV: false)?.toHexString().addHexPrefix() else {
+            throw WalletCoreError.signingError
+        }
+        return signedMessage
+    }
+    
+    public func personalSign(hexString: String) throws -> String {
         guard let data = Data(hex: hexString).hashPersonalMessage() else {
             throw WalletCoreError.invalidHexString(hexString)
         }
@@ -35,6 +43,18 @@ public struct Account {
         return signedMessage
     }
     
+    public func signTypedMessage(payload: TypedMessage, version: SignTypedDataVersion = .v3) throws -> String {
+        do {
+            return try MEWwalletKit.signTypedMessage(
+                privateKey: privateKey,
+                payload: SignedMessagePayload.init(data: payload, signature: nil),
+                version: version
+            ).addHexPrefix()
+        } catch {
+            throw WalletCoreError.signingError
+        }
+    }
+    
 //    public init(address: Address, path: String, network: Network, mnemonic: String)
     /*
     public func sign(tx: Transaction) throws -> String {
diff --git a/Sources/SafariWalletCore/Provider/ProviderAPI.swift b/Sources/SafariWalletCore/Provider/ProviderAPI.swift
index 4b19148..52fc4d4 100644
--- a/Sources/SafariWalletCore/Provider/ProviderAPI.swift
+++ b/Sources/SafariWalletCore/Provider/ProviderAPI.swift
@@ -119,10 +119,18 @@ public struct ProviderAPI {
             let result = try await client.ethGetBalance(address: params[0], blockNumber: Block(rawValue: params[1]))
             return result.hexString
             
-        case "eth_sendTransaction":
-            // https://eth.wiki/json-rpc/API#eth_sendtransaction
-            // FIXME: Returns mock result
-            return "0xe670ec64341771606e55d6b4ca35a1a6b75ee3d5145a99d05921026d1527331"
+        case "eth_signTypedData_v3", "eth_signTypedData_v4":
+            guard let params = params as? [String], params.count == 2 else {
+                throw WalletCoreError.invalidParams
+            }
+            let account = try await delegate.account(address: params[0], password: "password123") // FIXME: password
+            guard let json = params[1].toJSON() as? [String : Any] else {
+                throw WalletCoreError.invalidParams
+            }
+            return try account.signTypedMessage(
+                payload: .init(json: json),
+                version: method == "eth_signTypedData_v4" ? .v4 : .v3
+            )
             
         case "eth_sign":
             // https://eth.wiki/json-rpc/API#eth_sign
@@ -131,15 +139,23 @@ public struct ProviderAPI {
             }
             let address = params[0]
             let message = params[1]
-            let password: String?
-            if params.count >= 3 {
-                password = params[2]
-            } else {
-                password = nil
-            }
-            let account = try await delegate.account(address: address, password: password)
+            let account = try await delegate.account(address: address, password: "password123") // FIXME: password
             return try account.sign(hexString: message)
-                        
+
+        case "personal_sign":
+            guard let params = params as? [String], params.count >= 2 else {
+                throw WalletCoreError.invalidParams
+            }
+            let address = params[0]
+            let message = params[1]
+            let account = try await delegate.account(address: address, password: "password123") // FIXME: password
+            return try account.personalSign(hexString: message)
+
+        case "eth_sendTransaction":
+            // https://eth.wiki/json-rpc/API#eth_sendtransaction
+            // FIXME: Returns mock result
+            return "0xe670ec64341771606e55d6b4ca35a1a6b75ee3d5145a99d05921026d1527331"
+
         default:
             throw WalletCoreError.unknownMethod(method)
         }