diff --git a/.env.defaults b/.env.defaults
new file mode 100644
index 00000000..28e88d2b
--- /dev/null
+++ b/.env.defaults
@@ -0,0 +1,48 @@
+# Default / shared build-time env for the Lux Wallet monorepo.
+#
+# Consumed by `react-native-dotenv` (metro/jest, `safe: true`) and by the web
+# build. Real secrets are injected at deploy time (KMS) and via `.env*.local`;
+# the values here are inert placeholders so the config schema resolves and the
+# `safe` check passes. Keep every key that `@l.x/config` imports listed here.
+
+# API keys (placeholders — real values come from KMS / .env.local)
+ALCHEMY_API_KEY=stored-in-.env.local
+APPSFLYER_API_KEY=stored-in-.env.local
+APPSFLYER_APP_ID=stored-in-.env.local
+DATADOG_CLIENT_TOKEN=stored-in-.env.local
+DATADOG_PROJECT_ID=stored-in-.env.local
+INFURA_KEY=stored-in-.env.local
+ONESIGNAL_APP_ID=stored-in-.env.local
+QUICKNODE_ENDPOINT_NAME=stored-in-.env.local
+QUICKNODE_ENDPOINT_TOKEN=stored-in-.env.local
+STATSIG_API_KEY=stored-in-.env.local
+LX_API_KEY=stored-in-.env.local
+TRADING_API_KEY=stored-in-.env.local
+WALLETCONNECT_PROJECT_ID=stored-in-.env.local
+WALLETCONNECT_PROJECT_ID_BETA=stored-in-.env.local
+WALLETCONNECT_PROJECT_ID_DEV=stored-in-.env.local
+
+# Feature flags
+INCLUDE_PROTOTYPE_FEATURES=false
+IS_E2E_TEST=false
+ENABLE_SESSION_SERVICE=false
+ENABLE_SESSION_UPGRADE_AUTO=false
+ENABLE_ENTRY_GATEWAY_PROXY=false
+
+# Proxy URLs
+BLOCKAID_PROXY_URL=
+JUPITER_PROXY_URL=
+
+# URL overrides (keep empty in this shared file)
+AMPLITUDE_PROXY_URL_OVERRIDE=
+API_BASE_URL_OVERRIDE=
+API_BASE_URL_V2_OVERRIDE=
+ENTRY_GATEWAY_API_URL_OVERRIDE=
+FOR_API_URL_OVERRIDE=
+GRAPHQL_URL_OVERRIDE=
+LIQUIDITY_SERVICE_URL_OVERRIDE=
+LX_NOTIF_API_BASE_URL_OVERRIDE=
+SCANTASTIC_API_URL_OVERRIDE=
+STATSIG_PROXY_URL_OVERRIDE=
+TRADING_API_URL_OVERRIDE=
+UNITAGS_API_URL_OVERRIDE=
diff --git a/config/jest-presets/jest/assetFileMock.js b/config/jest-presets/jest/assetFileMock.js
new file mode 100644
index 00000000..10ba33de
--- /dev/null
+++ b/config/jest-presets/jest/assetFileMock.js
@@ -0,0 +1,2 @@
+// Static-asset stub for jest: images/fonts/media resolve to a stable string.
+module.exports = 'mock-asset'
diff --git a/config/jest-presets/jest/globals.js b/config/jest-presets/jest/globals.js
new file mode 100644
index 00000000..9b795583
--- /dev/null
+++ b/config/jest-presets/jest/globals.js
@@ -0,0 +1,26 @@
+// Deterministic timezone + APP_ID so config schema validation passes under jest.
+process.env.TZ = process.env.TZ ?? 'America/New_York'
+process.env.APP_ID = process.env.APP_ID ?? 'web'
+
+module.exports = {
+  globals: {
+    ALCHEMY_API_KEY: 'key',
+    AMPLITUDE_PROXY_URL_OVERRIDE: '',
+    API_BASE_URL_OVERRIDE: '',
+    API_BASE_URL_V2_OVERRIDE: '',
+    APPSFLYER_API_KEY: 'key',
+    APPSFLYER_APP_ID: 123,
+    DATADOG_CLIENT_TOKEN: 'key',
+    DATADOG_PROJECT_ID: 123,
+    INFURA_KEY: 'key',
+    ONESIGNAL_APP_ID: 'key',
+    STATSIG_API_KEY: 'key',
+    STATSIG_PROXY_URL_OVERRIDE: '',
+    TRADING_API_KEY: 'key',
+    TRADING_API_URL_OVERRIDE: '',
+    WALLETCONNECT_PROJECT_ID: 'key',
+    QUICKNODE_ENDPOINT_NAME: '',
+    QUICKNODE_ENDPOINT_TOKEN: '',
+    UNITAGS_API_URL_OVERRIDE: '',
+  },
+}
diff --git a/config/jest-presets/jest/jest-preset.js b/config/jest-presets/jest/jest-preset.js
new file mode 100644
index 00000000..8553a187
--- /dev/null
+++ b/config/jest-presets/jest/jest-preset.js
@@ -0,0 +1,51 @@
+// Jest preset for the Lux Wallet monorepo.
+//
+// The source was migrated to the published `@l.x/*` + `@luxfi/*` package
+// names, but the shared feature code (and the `@l.x/*` packages themselves)
+// still import each other by the upstream short names (`lux/…`, `utilities/…`,
+// `ui/…`, `wallet/…`, `config/…`). This preset restores those aliases for the
+// jest resolver and stubs static assets. The RN transform layer comes from
+// `jest-expo`, which each package sets as its `preset`.
+const path = require('path')
+const globals = require('./globals')
+
+const assetFileMock = path.resolve(__dirname, 'assetFileMock.js')
+
+module.exports = {
+  moduleNameMapper: {
+    // Static assets → stable stub string.
+    '\\.(png|jpg|jpeg|gif|webp|ttf|otf|woff|woff2|mp4|mp3|wav|m4a|lottie)$': assetFileMock,
+
+    // Upstream short-name → published package aliases. Longest / most
+    // specific first (jest uses first-match-wins).
+    // The published @l.x/utils omits its jest mocks; serve the shared copy.
+    '^utilities/jest-package-mocks$': path.resolve(__dirname, '../utilities-package-mocks.js'),
+    '^config/jest-presets/(.*)$': path.resolve(__dirname, '../$1'),
+    '^utilities/(.*)$': '@l.x/utils/$1',
+    '^uniswap/(.*)$': '@l.x/lx/$1',
+    '^lux/(.*)$': '@l.x/lx/$1',
+    '^lx/(.*)$': '@l.x/lx/$1',
+    '^ui/(.*)$': '@l.x/ui/$1',
+    // The wallet package is @luxfi/wallet == this rootDir (no self-symlink
+    // under pnpm), so route its own name and the short `wallet/` alias to src.
+    '^@luxfi/wallet/(.*)$': '<rootDir>/$1',
+    '^wallet/(.*)$': '<rootDir>/$1',
+
+    // `@luxexchange/*` is the internal scope name the `@l.x/*` packages use to
+    // reference each other; alias the whole scope to the published packages.
+    '^@luxexchange/(.*)$': '@l.x/$1',
+  },
+  setupFilesAfterEnv: [path.resolve(__dirname, 'setup.js')],
+  // The RN surface is the @hanzogui fork; jest-expo's default ignore list only
+  // whitelists upstream `react-native`. Let the Flow-typed fork packages + the
+  // ESM-only deps through babel so the expo preset can strip their types.
+  //
+  // pnpm flattens scoped packages to `.pnpm/@scope+name@ver/…`, so the classic
+  // `@scope/name/`-anchored whitelist never matches the virtual store. Match at
+  // scope level and allow the pnpm separators (`+`, `@`) as well as `/`.
+  transformIgnorePatterns: [
+    'node_modules/(?!(?:\\.pnpm/)?(?:@hanzogui|@react-native|@react-navigation|@shopify|@gorhom|@l\\.x|@luxfi|@noble|@scure|@walletconnect|@statsig|@solana|react-native[a-z-]*|expo[a-z-]*|moti|nanoid|uuid|viem|wagmi|redux-persist)[-+@/])',
+  ],
+  clearMocks: true,
+  ...globals,
+}
diff --git a/config/jest-presets/jest/setup.js b/config/jest-presets/jest/setup.js
new file mode 100644
index 00000000..98bad0e3
--- /dev/null
+++ b/config/jest-presets/jest/setup.js
@@ -0,0 +1,32 @@
+// Shared jest environment setup for the Lux Wallet monorepo.
+// Provides the browser/runtime globals the RN + web code assumes.
+
+// rtk-query baseQueryFn and viem expect a global fetch.
+if (typeof globalThis.fetch === 'undefined') {
+  try {
+    require('cross-fetch/polyfill')
+  } catch {
+    // Node 18+ ships a global fetch; nothing to polyfill.
+  }
+}
+
+// crypto.randomUUID for environments that lack it.
+if (typeof globalThis.crypto === 'undefined') {
+  globalThis.crypto = require('node:crypto')
+} else if (typeof globalThis.crypto.randomUUID !== 'function') {
+  globalThis.crypto.randomUUID = require('node:crypto').randomUUID
+}
+
+// chrome.* extension APIs used by shared wallet code.
+if (typeof global.chrome === 'undefined') {
+  global.chrome = {
+    storage: {
+      local: { set: jest.fn(), get: jest.fn(), remove: jest.fn() },
+      session: { set: jest.fn(), get: jest.fn(), remove: jest.fn() },
+    },
+    runtime: {
+      getURL: (path) => `chrome/path/to/${path}`,
+      onMessage: { addListener: jest.fn(), removeListener: jest.fn() },
+    },
+  }
+}
diff --git a/config/jest-presets/package.json b/config/jest-presets/package.json
new file mode 100644
index 00000000..caeb9929
--- /dev/null
+++ b/config/jest-presets/package.json
@@ -0,0 +1,7 @@
+{
+  "name": "config",
+  "version": "1.0.0",
+  "private": true,
+  "description": "Jest presets + shared test mocks for the Lux Wallet monorepo (jest-expo base).",
+  "main": "jest/jest-preset.js"
+}
diff --git a/config/jest-presets/ui/ui-package-mocks.js b/config/jest-presets/ui/ui-package-mocks.js
new file mode 100644
index 00000000..5d876b97
--- /dev/null
+++ b/config/jest-presets/ui/ui-package-mocks.js
@@ -0,0 +1,44 @@
+// Shared UI-layer jest mocks. Imported by each package's jest-setup.
+// Kept conservative: only the RN primitives that have no jsdom/native
+// implementation under jest. Package-specific mocks live in each package's
+// own jest-package-mocks.
+
+jest.mock('react-native-safe-area-context', () => ({
+  useSafeAreaInsets: jest.fn().mockReturnValue({ top: 0, bottom: 0, left: 0, right: 0 }),
+  useSafeAreaFrame: jest.fn().mockReturnValue({ x: 0, y: 0, width: 0, height: 0 }),
+  SafeAreaProvider: jest.fn(({ children }) => children),
+  SafeAreaView: jest.fn(({ children }) => children),
+}))
+
+jest.mock('react-native-webview', () => {
+  const { View } = require('react-native')
+  return { WebView: View }
+})
+
+// Native modules with no jest-usable implementation. Imported at the top of
+// each package's jest-setup (before the lux/wallet mocks that pull these in),
+// so registering them here makes them active for the whole setup chain.
+jest.mock('react-native/Libraries/EventEmitter/NativeEventEmitter')
+
+jest.mock('react-native-device-info', () =>
+  require('react-native-device-info/jest/react-native-device-info-mock'),
+)
+
+jest.mock('@react-native-async-storage/async-storage', () =>
+  require('@react-native-async-storage/async-storage/jest/async-storage-mock'),
+)
+
+jest.mock('@react-native-community/netinfo', () => ({
+  ...require('@react-native-community/netinfo/jest/netinfo-mock.js'),
+  NetInfoStateType: {
+    unknown: 'unknown',
+    none: 'none',
+    cellular: 'cellular',
+    wifi: 'wifi',
+    bluetooth: 'bluetooth',
+    ethernet: 'ethernet',
+    wimax: 'wimax',
+    vpn: 'vpn',
+    other: 'other',
+  },
+}))
diff --git a/config/jest-presets/utilities-package-mocks.js b/config/jest-presets/utilities-package-mocks.js
new file mode 100644
index 00000000..83eee6f2
--- /dev/null
+++ b/config/jest-presets/utilities-package-mocks.js
@@ -0,0 +1,38 @@
+/**
+ * Common mocks for the utilities layer. Imported by each package's jest-setup.
+ * The published `@l.x/utils` package does not ship its jest mocks, so the
+ * shared copy lives here (matches the upstream `utilities/jest-package-mocks`).
+ *
+ * Notes:
+ * * Try not to add test-specific mocks here.
+ * * Be wary of import order.
+ * * mocks can be overridden per-package.
+ */
+const util = require('util')
+
+global.TextEncoder = global.TextEncoder ?? util.TextEncoder
+global.TextDecoder = global.TextDecoder ?? util.TextDecoder
+
+jest.mock('expo-localization', () => ({
+  getLocales: () => [
+    {
+      languageCode: 'en',
+      languageTag: 'en-US',
+      regionCode: null,
+      currencyCode: null,
+      currencySymbol: null,
+      decimalSeparator: null,
+      digitGroupingSeparator: null,
+      textDirection: null,
+      measurementSystem: null,
+      temperatureUnit: null,
+    },
+  ],
+}))
+
+jest.mock('@datadog/browser-logs', () => ({
+  datadogLogs: {
+    // intentionally empty — datadog must be inert under test
+    logger: {},
+  },
+}))
diff --git a/pkgs/wallet/jest-setup.js b/pkgs/wallet/jest-setup.js
index 407cfcc6..41079761 100644
--- a/pkgs/wallet/jest-setup.js
+++ b/pkgs/wallet/jest-setup.js
@@ -77,10 +77,10 @@ jest.mock('@l.x/utils/src/device/locales', () => {
   return jest.requireActual('@l.x/utils/src/device/locales.native.ts')
 })
 
-// Mock getConfig to use native implementation
+// Force getConfig to the native implementation while preserving the rest of
+// the config surface (brand, getGatewayUrl, getWsUrl, …) that @l.x/api needs.
 jest.mock('@luxexchange/config', () => {
+  const actual = jest.requireActual('@luxexchange/config')
   const { getConfig } = jest.requireActual('@luxexchange/config/src/getConfig.native')
-  return {
-    getConfig
-  }
+  return { ...actual, getConfig }
 })
diff --git a/pkgs/wallet/jest.config.js b/pkgs/wallet/jest.config.js
index f0d24187..13b987d7 100644
--- a/pkgs/wallet/jest.config.js
+++ b/pkgs/wallet/jest.config.js
@@ -25,11 +25,22 @@ module.exports = {
     // avoid native because wallet tests assume no .native.ts
     platforms: ['web', 'ios', 'android'],
   },
-  // Override moduleFileExtensions to NOT prioritize .web.ts for native tests
-  // This ensures wallet tests use moti animations from index.ts, not CSS from index.web.ts
+  // Native-first resolution: `.ios`/`.native` platform splits win over the base
+  // file, but `.web` is never consulted (wallet tests run against the native
+  // bundle — e.g. moti animations, not the CSS web variants). This is required
+  // so platform-split stubs like `@l.x/utils/src/environment/env.ts` resolve to
+  // their real `env.native.ts` implementation instead of throwing.
   moduleFileExtensions: [
+    'ios.ts',
+    'ios.tsx',
+    'native.ts',
+    'native.tsx',
     'ts',
     'tsx',
+    'ios.js',
+    'ios.jsx',
+    'native.js',
+    'native.jsx',
     'js',
     'jsx',
     'json',