diff --git a/Examples/SmartWalletsDemo/SmartWalletsDemo/Login/CrossmintAuthManager.swift b/Examples/SmartWalletsDemo/SmartWalletsDemo/Login/CrossmintAuthManager.swift
index c37c76b..3ed493f 100644
--- a/Examples/SmartWalletsDemo/SmartWalletsDemo/Login/CrossmintAuthManager.swift
+++ b/Examples/SmartWalletsDemo/SmartWalletsDemo/Login/CrossmintAuthManager.swift
@@ -5,9 +5,7 @@
 //  Created by Austin Feight on 11/24/25.
 //
 
-import CrossmintAuth
 import CrossmintClient
 
 let crossmintApiKey = "ck_staging_YOUR_API_KEY"
-// swiftlint:disable:next force_try
-let crossmintAuthManager = try! CrossmintAuthManager(apiKey: crossmintApiKey)
+@MainActor var authManager: CrossmintAuthManager { CrossmintSDK.shared.authManager }
diff --git a/Examples/SmartWalletsDemo/SmartWalletsDemo/Login/JWTSignInView.swift b/Examples/SmartWalletsDemo/SmartWalletsDemo/Login/JWTSignInView.swift
index 82bddfc..5463e09 100644
--- a/Examples/SmartWalletsDemo/SmartWalletsDemo/Login/JWTSignInView.swift
+++ b/Examples/SmartWalletsDemo/SmartWalletsDemo/Login/JWTSignInView.swift
@@ -77,7 +77,7 @@ struct JWTSignInView: View {
         }
         isSigningIn = true
         Task {
-            await crossmintAuthManager.setJWT(token)
+            await CrossmintSDK.shared.setJWT(token)
             let authStatus = AuthenticationStatus.authenticated(email: email, jwt: token, secret: "")
             withAnimation(AnimationConstants.easeInOut()) {
                 authenticationStatus = authStatus
diff --git a/Examples/SmartWalletsDemo/SmartWalletsDemo/Login/OTPSignInView.swift b/Examples/SmartWalletsDemo/SmartWalletsDemo/Login/OTPSignInView.swift
index e7a1c7f..9d4bf19 100644
--- a/Examples/SmartWalletsDemo/SmartWalletsDemo/Login/OTPSignInView.swift
+++ b/Examples/SmartWalletsDemo/SmartWalletsDemo/Login/OTPSignInView.swift
@@ -74,7 +74,7 @@ struct OTPSignInView: View {
         isSigningIn = true
         Task {
             do {
-                try await crossmintAuthManager.sendEmailOtp(email: email)
+                try await authManager.sendEmailOtp(email: email)
                 isSigningIn = false
                 showOTPVerification = true
             } catch let authError as AuthManagerError {
diff --git a/Examples/SmartWalletsDemo/SmartWalletsDemo/Login/VerificationView.swift b/Examples/SmartWalletsDemo/SmartWalletsDemo/Login/VerificationView.swift
index dddcfde..5caa1d8 100644
--- a/Examples/SmartWalletsDemo/SmartWalletsDemo/Login/VerificationView.swift
+++ b/Examples/SmartWalletsDemo/SmartWalletsDemo/Login/VerificationView.swift
@@ -2,8 +2,6 @@ import SwiftUI
 import CrossmintClient
 
 struct VerificationView: View {
-    private let sdk: CrossmintSDK = .shared
-
     @Binding var authenticationStatus: AuthenticationStatus?
 
     @State private var verificationCode: String = ""
@@ -12,10 +10,6 @@ struct VerificationView: View {
     @State private var alertMessage: String = ""
     @State private var opacity: Double = 0
 
-    private var authManager: AuthManager {
-        sdk.authManager
-    }
-
     let email: String
 
     var body: some View {
@@ -82,7 +76,7 @@ struct VerificationView: View {
         isVerifying = true
         Task {
             do {
-                let status = try await crossmintAuthManager.confirmEmailOtp(email: email, code: verificationCode)
+                let status = try await authManager.confirmEmailOtp(email: email, code: verificationCode)
 
                 isVerifying = false
 
@@ -91,9 +85,8 @@ struct VerificationView: View {
                         opacity = 0
                     }
 
-                    DispatchQueue.main.asyncAfter(deadline: .now() + AnimationConstants.duration) {
-                        authenticationStatus = authStatus
-                    }
+                    try? await Task.sleep(for: .seconds(AnimationConstants.duration))
+                    authenticationStatus = authStatus
                 }
             } catch {
                 isVerifying = false
@@ -106,7 +99,7 @@ struct VerificationView: View {
     private func resendCode() {
         Task {
             do {
-                try await crossmintAuthManager.sendEmailOtp(email: email)
+                try await authManager.sendEmailOtp(email: email)
                 showAlert(with: "A new verification code has been sent to your email.")
             } catch {
                 showAlert(with: "Error sending new code: \(error.localizedDescription)")
@@ -121,10 +114,9 @@ struct VerificationView: View {
         }
 
         Task {
-            _ = await crossmintAuthManager.reset()
-            DispatchQueue.main.asyncAfter(deadline: .now() + AnimationConstants.duration) {
-                authenticationStatus = .nonAuthenticated
-            }
+            _ = await authManager.reset()
+            try? await Task.sleep(for: .seconds(AnimationConstants.duration))
+            authenticationStatus = .nonAuthenticated
         }
     }
 
diff --git a/Examples/SmartWalletsDemo/SmartWalletsDemo/Playground/PlaygroundView.swift b/Examples/SmartWalletsDemo/SmartWalletsDemo/Playground/PlaygroundView.swift
index 5add07b..7fd4562 100644
--- a/Examples/SmartWalletsDemo/SmartWalletsDemo/Playground/PlaygroundView.swift
+++ b/Examples/SmartWalletsDemo/SmartWalletsDemo/Playground/PlaygroundView.swift
@@ -79,8 +79,7 @@ struct PlaygroundView: View {
     }
 
     private func signOut() async {
-        try? await crossmintAuthManager.logout()
-        CrossmintSDK.shared.logout()
+        await CrossmintSDK.shared.logout()
         authenticationStatus = .nonAuthenticated
     }
 }
diff --git a/Examples/SmartWalletsDemo/SmartWalletsDemo/SmartWalletsDemoApp.swift b/Examples/SmartWalletsDemo/SmartWalletsDemo/SmartWalletsDemoApp.swift
index 115852b..1c6a4dd 100644
--- a/Examples/SmartWalletsDemo/SmartWalletsDemo/SmartWalletsDemoApp.swift
+++ b/Examples/SmartWalletsDemo/SmartWalletsDemo/SmartWalletsDemoApp.swift
@@ -3,12 +3,14 @@ import CrossmintClient
 
 @main
 struct SmartWalletsDemoApp: App {
+    init() {
+        CrossmintSDK.configure(apiKey: crossmintApiKey, logLevel: .info)
+    }
+
     var body: some Scene {
         WindowGroup {
             SplashScreen()
-                .crossmintNonCustodialSigner(
-                    CrossmintSDK.shared(apiKey: crossmintApiKey, authManager: crossmintAuthManager, logLevel: .info)
-                )
+                .crossmintNonCustodialSigner()
         }
     }
 }
diff --git a/Examples/SmartWalletsDemo/SmartWalletsDemo/SplashScreen.swift b/Examples/SmartWalletsDemo/SmartWalletsDemo/SplashScreen.swift
index 6d7b696..95dfd62 100644
--- a/Examples/SmartWalletsDemo/SmartWalletsDemo/SplashScreen.swift
+++ b/Examples/SmartWalletsDemo/SmartWalletsDemo/SplashScreen.swift
@@ -38,9 +38,6 @@ struct SplashScreen: View {
     @State private var authenticationStatus: AuthenticationStatus?
     @State private var transitionOpacity: Double = 0
     @State private var error: Error?
-    private var authManager: AuthManager {
-        CrossmintSDK.shared.authManager
-    }
 
     @ViewBuilder
     private var splashContent: some View {
@@ -130,7 +127,7 @@ struct SplashScreen: View {
         guard authenticationStatus == nil else { return }
         isLoading = true
         do {
-            authenticationStatus = try await crossmintAuthManager.authenticationStatus
+            authenticationStatus = try await authManager.authenticationStatus
         } catch {
             if case .signInRequired = error {
                 self.error = .invalidCredentialsStored
diff --git a/Sources/CrossmintClient/ClientSDK.swift b/Sources/CrossmintClient/ClientSDK.swift
index af48ffb..d7999cb 100644
--- a/Sources/CrossmintClient/ClientSDK.swift
+++ b/Sources/CrossmintClient/ClientSDK.swift
@@ -1,8 +1,9 @@
 import CrossmintAuth
+import CrossmintService
 import Wallet
 
 protocol ClientSDK {
     func crossmintWallets() -> CrossmintWallets
-    var authManager: AuthManager { get }
-    var isProductionEnvironment: Bool { get }
+    var authManager: CrossmintAuthManager { get }
+    var crossmintService: CrossmintService { get }
 }
diff --git a/Sources/CrossmintClient/CrossmintClient.swift b/Sources/CrossmintClient/CrossmintClient.swift
index dce388d..4da2f63 100644
--- a/Sources/CrossmintClient/CrossmintClient.swift
+++ b/Sources/CrossmintClient/CrossmintClient.swift
@@ -16,7 +16,7 @@ actor CrossmintClient {
         self.apiKey = apiKey
     }
 
-    static func sdk(key: String, authManager: AuthManager? = nil) throws -> ClientSDK {
+    static func sdk(key: String, authManager: CrossmintAuthManager? = nil) throws -> ClientSDK {
         lock.lock()
         defer { lock.unlock() }
 
diff --git a/Sources/CrossmintClient/CrossmintClientSDK.swift b/Sources/CrossmintClient/CrossmintClientSDK.swift
index 24cfa1a..bf46050 100644
--- a/Sources/CrossmintClient/CrossmintClientSDK.swift
+++ b/Sources/CrossmintClient/CrossmintClientSDK.swift
@@ -9,10 +9,10 @@ final class CrossmintClientSDK: ClientSDK, Sendable {
     private let apiKey: ApiKey
     private let secureStorage: SecureStorage
     private let secureWalletStorage: SecureWalletStorage
-    private let crossmintService: CrossmintService
-    let authManager: any CrossmintAuth.AuthManager
+    let crossmintService: CrossmintService
+    let authManager: CrossmintAuthManager
 
-    init(apiKey: ApiKey, authManager: AuthManager? = nil) {
+    init(apiKey: ApiKey, authManager: CrossmintAuthManager? = nil) {
         self.apiKey = apiKey
 
         guard let bundleId = Bundle.main.bundleIdentifier else {
diff --git a/Sources/CrossmintClient/SwiftUI/CrossmintSDK.swift b/Sources/CrossmintClient/SwiftUI/CrossmintSDK.swift
index d5f844b..6b546bf 100644
--- a/Sources/CrossmintClient/SwiftUI/CrossmintSDK.swift
+++ b/Sources/CrossmintClient/SwiftUI/CrossmintSDK.swift
@@ -12,37 +12,34 @@ import Web
 
 @MainActor
 final public class CrossmintSDK: ObservableObject {
-    private static var _shared: CrossmintSDK?
+    @MainActor private static var _shared: CrossmintSDK?
 
-    public static var shared: CrossmintSDK {
-        guard let shared = _shared else {
-            let newInstance = CrossmintSDK()
-            _shared = newInstance
-            return newInstance
+    @MainActor public static var shared: CrossmintSDK {
+        guard let instance = _shared else {
+            fatalError(
+                "CrossmintSDK is not configured. " +
+                "Call CrossmintSDK.configure(apiKey:) before accessing CrossmintSDK.shared."
+            )
         }
-        return shared
+        return instance
     }
 
-    public static func shared(
-        apiKey: String,
-        authManager: AuthManager? = nil,
-        logLevel: LogLevel = .error
-    ) -> CrossmintSDK {
-        if let existing = _shared {
-            return existing
+    /// Configures the SDK with the given API key. Must be called before accessing `CrossmintSDK.shared`.
+    /// Subsequent calls are ignored — the SDK can only be configured once per process.
+    @MainActor public static func configure(apiKey: String, logLevel: LogLevel = .error) {
+        guard _shared == nil else {
+            Logger.sdk.warn("CrossmintSDK.configure() called after SDK is already configured — ignoring")
+            return
         }
-
         Logger.level = logLevel
-        let newInstance = CrossmintSDK(apiKey: apiKey, authManager: authManager)
-        _shared = newInstance
-        return newInstance
+        _shared = CrossmintSDK(apiKey: apiKey)
     }
 
     private let sdk: ClientSDK
 
     public let crossmintWallets: CrossmintWallets
-    public let authManager: AuthManager
-    public let isProductionEnvironment: Bool
+    public let authManager: CrossmintAuthManager
+    public let crossmintService: CrossmintService
 
     let crossmintTEE: CrossmintTEE
 
@@ -56,46 +53,52 @@ final public class CrossmintSDK: ObservableObject {
         crossmintTEE.cancelOTP()
     }
 
-    private convenience init() {
-        #if DEBUG
-            if let apiKey = ProcessInfo.processInfo.environment["CROSSMINT_API_KEY"] {
-                Logger.client.info("Using API key from the environment variable.")
-                self.init(apiKey: apiKey)
-                return
-            }
-        #endif
-        Logger.client.error("Crossmint SDK requires an API key")
-        fatalError(
-            "Crossmint SDK requires an API key. " +
-            "Please call CrossmintSDK.shared(apiKey:) before accessing CrossmintSDK.shared"
-        )
+    public var isProductionEnvironment: Bool {
+        crossmintService.isProductionEnvironment
     }
 
-    private init(apiKey: String, authManager: AuthManager? = nil) {
+    /// Sets a JWT for authentication. Use this when authenticating with an externally obtained token
+    /// rather than through the built-in OTP flow.
+    ///
+    /// - Note: Unlike the TypeScript SDK's synchronous `setJwt`, this is `async` because it
+    ///   updates actor-isolated state on `CrossmintAuthManager`.
+    public func setJWT(_ jwt: String) async {
+        await authManager.setJWT(jwt)
+    }
+
+    private init(apiKey: String) {
         sdkInstances += 1
         if sdkInstances > 1 {
             Logger.sdk.error("Multiple SDK instances created, behaviour is undefined")
         }
 
+        let innerSdk: ClientSDK
         do {
-            sdk = try CrossmintClient.sdk(key: apiKey, authManager: authManager)
-            let authManager = sdk.authManager
-            self.crossmintWallets = sdk.crossmintWallets()
-            self.authManager = authManager
-            self.isProductionEnvironment = sdk.isProductionEnvironment
-            self.crossmintTEE = CrossmintTEE.start(
-                auth: authManager,
-                webProxy: DefaultWebViewCommunicationProxy(),
-                apiKey: apiKey,
-                isProductionEnvironment: isProductionEnvironment
-            )
+            innerSdk = try CrossmintClient.sdk(key: apiKey)
         } catch {
             Logger.client.error("Invalid Crossmint API key provided: \(error)")
             fatalError("Invalid Crossmint API key provided. Please verify your API key is a valid client key.")
         }
+
+        let authManager = innerSdk.authManager
+        sdk = innerSdk
+        crossmintWallets = innerSdk.crossmintWallets()
+        self.authManager = authManager
+        crossmintService = innerSdk.crossmintService
+        crossmintTEE = CrossmintTEE.start(
+            auth: authManager,
+            webProxy: DefaultWebViewCommunicationProxy(),
+            apiKey: apiKey,
+            isProductionEnvironment: innerSdk.crossmintService.isProductionEnvironment
+        )
     }
 
-    public func logout() {
+    public func logout() async {
+        do {
+            _ = try await authManager.logout()
+        } catch {
+            Logger.sdk.warn("Logout request failed: \(error) — clearing local state anyway")
+        }
         crossmintTEE.resetState()
     }
 
diff --git a/Sources/CrossmintClient/SwiftUI/View+NonCustodialSigner.swift b/Sources/CrossmintClient/SwiftUI/View+NonCustodialSigner.swift
index 378bc97..8477a0f 100644
--- a/Sources/CrossmintClient/SwiftUI/View+NonCustodialSigner.swift
+++ b/Sources/CrossmintClient/SwiftUI/View+NonCustodialSigner.swift
@@ -26,17 +26,13 @@ final class InstanceTracker: ObservableObject, Sendable {
 }
 
 extension View {
-    public func crossmintNonCustodialSigner(_ sdk: CrossmintSDK) -> some View {
-        self.modifier(CrossmintNonCustodialSignerViewModifier(sdk: sdk))
+    public func crossmintNonCustodialSigner() -> some View {
+        self.modifier(CrossmintNonCustodialSignerViewModifier())
     }
 }
 
 private struct CrossmintNonCustodialSignerViewModifier: ViewModifier {
-    private let crossmintTEE: CrossmintTEE
-
-    init(sdk: CrossmintSDK) {
-        crossmintTEE = sdk.crossmintTEE
-    }
+    private let crossmintTEE: CrossmintTEE = CrossmintSDK.shared.crossmintTEE
 
     func body(content: Content) -> some View {
         ZStack {