diff --git a/package.json b/package.json
index e0f48b7..90a6a86 100644
--- a/package.json
+++ b/package.json
@@ -1,7 +1,7 @@
 {
     "name": "@wharfkit/wallet-plugin-web-authenticator",
     "description": "A Web Authenticator wallet plugin for use with @wharfkit/session.",
-    "version": "0.3.1",
+    "version": "0.5.0",
     "homepage": "https://github.com/wharfkit/wallet-plugin-web-authenticator",
     "license": "BSD-3-Clause",
     "main": "lib/wallet-plugin-web-authenticator.js",
diff --git a/src/index.ts b/src/index.ts
index 61d0998..e911878 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -29,8 +29,8 @@ import WebSocket from 'isomorphic-ws'
 import defaultTranslations from './translations'
 
 interface WebAuthenticatorOptions {
-    /** The URL of the web authenticator service */
-    webAuthenticatorUrl?: string
+    /** The URLs for the web authenticator service, keyed by chain ID */
+    urls: Record<string, string>
     /** The buoy service URL for messaging */
     buoyServiceUrl?: string
     /** The buoy WebSocket for messaging */
@@ -38,13 +38,13 @@ interface WebAuthenticatorOptions {
 }
 
 export class WalletPluginWebAuthenticator extends AbstractWalletPlugin implements WalletPlugin {
-    private webAuthenticatorUrl: string
+    private urls: Record<string, string>
     private buoyServiceUrl: string
     private buoyWs?: WebSocket
 
-    constructor(options: WebAuthenticatorOptions = {}) {
+    constructor(options: WebAuthenticatorOptions) {
         super()
-        this.webAuthenticatorUrl = options.webAuthenticatorUrl || 'http://localhost:5174'
+        this.urls = options.urls
         this.buoyServiceUrl = options.buoyServiceUrl || 'https://cb.anchor.link'
         this.buoyWs = options?.buoyWs
     }
@@ -85,6 +85,24 @@ export class WalletPluginWebAuthenticator extends AbstractWalletPlugin implement
      */
     translations = defaultTranslations
 
+    getChainUrl(context: LoginContext | TransactContext): string {
+        // default to first
+        let url = this.urls[0]
+
+        // override if chain specified
+        if (context.chain) {
+            url = this.urls[String(context.chain.id)]
+        }
+
+        if (!url) {
+            throw new Error(
+                `No web authenticator URL configured for chain ID: ${context.chain?.id}`
+            )
+        }
+
+        return url
+    }
+
     /**
      * Opens a popup window with the given URL and waits for it to complete
      */
@@ -218,7 +236,8 @@ export class WalletPluginWebAuthenticator extends AbstractWalletPlugin implement
                 privateKey,
             } = await createIdentityRequest(context, this.buoyServiceUrl)
 
-            const loginUrl = `${this.webAuthenticatorUrl}/sign?esr=${request.encode()}&chain=${
+            const url = this.getChainUrl(context)
+            const loginUrl = `${url}/sign?esr=${request.encode()}&chain=${
                 context.chain?.id
             }&requestKey=${requestKey}`
 
@@ -228,8 +247,8 @@ export class WalletPluginWebAuthenticator extends AbstractWalletPlugin implement
                 context.ui
             )
 
-            this.data.privateKey = String(privateKey)
-            this.data.publicKey = payload.link_key
+            this.data.encryptionKey = String(privateKey)
+            this.data.messageKey = payload.link_key
 
             if (!payload.cid) {
                 throw new Error('Login failed: No chain ID returned')
@@ -274,7 +293,7 @@ export class WalletPluginWebAuthenticator extends AbstractWalletPlugin implement
     ): Promise<WalletPluginSignResponse> {
         try {
             // Ensure we have a request key from login
-            if (!this.data.privateKey || !this.data.publicKey) {
+            if (!this.data.encryptionKey || !this.data.messageKey) {
                 throw new Error('No request keys available - please login first')
             }
 
@@ -299,18 +318,19 @@ export class WalletPluginWebAuthenticator extends AbstractWalletPlugin implement
 
             const sealedRequest = await sealMessage(
                 modifiedRequest.encode(),
-                PrivateKey.from(this.data.privateKey),
-                PublicKey.from(this.data.publicKey),
+                PrivateKey.from(this.data.encryptionKey),
+                PublicKey.from(this.data.messageKey),
                 nonce
             )
 
-            const signUrl = `${this.webAuthenticatorUrl}/sign?sealed=${sealedRequest.toString(
+            const url = this.getChainUrl(context)
+            const signUrl = `${url}/sign?sealed=${sealedRequest.toString(
                 'hex'
             )}&nonce=${nonce.toString()}&chain=${context.chain?.id}&accountName=${
                 context.accountName
             }&permissionName=${context.permissionName}&appName=${
                 context.appName
-            }&requestKey=${String(PrivateKey.from(this.data.privateKey).toPublic())}`
+            }&requestKey=${String(PrivateKey.from(this.data.encryptionKey).toPublic())}`
 
             const response = await this.openPopup(signUrl, callback, context.ui)
 
diff --git a/test/tests/common.ts b/test/tests/common.ts
index ee896ee..23a30ca 100644
--- a/test/tests/common.ts
+++ b/test/tests/common.ts
@@ -1,5 +1,5 @@
 import {Chains, SessionKit} from '@wharfkit/session'
-import {PermissionLevel, Signature, APIClient, PrivateKey} from '@wharfkit/antelope'
+import {APIClient, PermissionLevel, PrivateKey, Signature} from '@wharfkit/antelope'
 import {
     mockChainDefinition,
     mockPermissionLevel,
@@ -9,21 +9,21 @@ import {
 } from '@wharfkit/mock-data'
 import {assert} from 'chai'
 import {
-    LoginContext,
-    ResolvedSigningRequest,
-    TransactContext,
-    ChainDefinition,
     ABICacheInterface,
-    WalletPluginSignResponse,
-    UserInterface,
     Cancelable,
+    ChainDefinition,
+    CreateAccountContext,
+    LoginContext,
+    LoginHooks,
     PromptArgs,
     PromptResponse,
+    ResolvedSigningRequest,
+    TransactContext,
     TransactHooks,
-    LoginHooks,
-    UserInterfaceLoginResponse,
+    UserInterface,
     UserInterfaceAccountCreationResponse,
-    CreateAccountContext,
+    UserInterfaceLoginResponse,
+    WalletPluginSignResponse,
 } from '@wharfkit/session'
 
 import {WalletPluginWebAuthenticator} from '$lib'
@@ -184,7 +184,10 @@ suite('wallet plugin', function () {
 
     test('login functionality', async function () {
         const plugin = new WalletPluginWebAuthenticator({
-            webAuthenticatorUrl: 'https://web-authenticator.greymass.com',
+            urls: {
+                '73e4385a2708e6d7048834fbc1079f2fabb17b3c125b146af438971e90716c4d':
+                    'https://web-authenticator.greymass.com',
+            },
         })
 
         // Mock login context
@@ -229,14 +232,17 @@ suite('wallet plugin', function () {
 
     test('sign functionality', async function () {
         const plugin = new WalletPluginWebAuthenticator({
-            webAuthenticatorUrl: 'https://web-authenticator.greymass.com',
+            urls: {
+                '73e4385a2708e6d7048834fbc1079f2fabb17b3c125b146af438971e90716c4d':
+                    'https://web-authenticator.greymass.com',
+            },
         })
 
         // Use different keys for the sign test to avoid channel ID conflicts
         const signPrivateKey = PrivateKey.generate('K1')
         const signPublicKey = signPrivateKey.toPublic()
-        plugin.data.privateKey = signPrivateKey
-        plugin.data.publicKey = signPublicKey
+        plugin.data.encryptionKey = signPrivateKey
+        plugin.data.messageKey = signPublicKey
 
         const mockResolvedSigningRequest = await makeMockResolvedSigningRequest()
 
@@ -275,7 +281,10 @@ suite('wallet plugin', function () {
 
     test('popup success with UI feedback', async function () {
         const plugin = new WalletPluginWebAuthenticator({
-            webAuthenticatorUrl: 'https://web-authenticator.greymass.com',
+            urls: {
+                '73e4385a2708e6d7048834fbc1079f2fabb17b3c125b146af438971e90716c4d':
+                    'https://web-authenticator.greymass.com',
+            },
         })
 
         // Mock login context with UI