diff --git a/packages/builder/src/api.ts b/packages/builder/src/api.ts
new file mode 100644
index 0000000000..5d1a0beaeb
--- /dev/null
+++ b/packages/builder/src/api.ts
@@ -0,0 +1,59 @@
+import {
+  createAPIClient,
+  CookieUtils,
+  Constants,
+} from "@budibase/frontend-core"
+import { appStore } from "stores/builder"
+import { get } from "svelte/store"
+import { auth, navigation } from "./stores/portal"
+
+export const API = createAPIClient({
+  attachHeaders: (headers: Record<string, string>) => {
+    // Attach app ID header from store
+    let appId = get(appStore).appId
+    if (appId) {
+      headers["x-budibase-app-id"] = appId
+    }
+
+    // Add csrf token if authenticated
+    const user: any = get(auth).user
+    if (user?.csrfToken) {
+      headers["x-csrf-token"] = user.csrfToken
+    }
+  },
+
+  onError: (error: any) => {
+    const { url, message, status, method, handled } = error || {}
+
+    // Log any errors that we haven't manually handled
+    if (!handled) {
+      console.error("Unhandled error from API client", error)
+      return
+    }
+
+    // Log all errors to console
+    console.warn(`[Builder] HTTP ${status} on ${method}:${url}\n\t${message}`)
+
+    // Logout on 403's
+    if (status === 403) {
+      // Remove cookies
+      CookieUtils.removeCookie(Constants.Cookies.Auth)
+
+      // Reload after removing cookie, go to login
+      if (!url.includes("self") && !url.includes("login")) {
+        location.reload()
+      }
+    }
+  },
+  onMigrationDetected: (appId: string) => {
+    const updatingUrl = `/builder/app/updating/${appId}`
+
+    if (window.location.pathname === updatingUrl) {
+      return
+    }
+
+    get(navigation)?.goto(
+      `${updatingUrl}?returnUrl=${encodeURIComponent(window.location.pathname)}`
+    )
+  },
+})
diff --git a/packages/builder/src/stores/portal/navigation.ts b/packages/builder/src/stores/portal/navigation.ts
new file mode 100644
index 0000000000..2b230622f6
--- /dev/null
+++ b/packages/builder/src/stores/portal/navigation.ts
@@ -0,0 +1,38 @@
+import { writable } from "svelte/store"
+
+type GotoFuncType = (path: string) => void
+
+interface Store {
+  initialisated: boolean
+  goto: GotoFuncType
+}
+
+export function createNavigationStore() {
+  const store = writable<Store>({
+    initialisated: false,
+    goto: undefined as any,
+  })
+  const { set, subscribe } = store
+
+  const init = (gotoFunc: GotoFuncType) => {
+    if (typeof gotoFunc !== "function") {
+      throw new Error(
+        `gotoFunc must be a function, found a "${typeof gotoFunc}" instead`
+      )
+    }
+
+    set({
+      initialisated: true,
+      goto: gotoFunc,
+    })
+  }
+
+  return {
+    subscribe,
+    actions: {
+      init,
+    },
+  }
+}
+
+export const navigation = createNavigationStore()
diff --git a/packages/builder/src/stores/portal/plugins.ts b/packages/builder/src/stores/portal/plugins.ts
new file mode 100644
index 0000000000..ff4dc3618f
--- /dev/null
+++ b/packages/builder/src/stores/portal/plugins.ts
@@ -0,0 +1,81 @@
+import { writable } from "svelte/store"
+import { PluginSource } from "constants/index"
+
+const { API } = require("api")
+
+interface Plugin {
+  _id: string
+}
+
+export function createPluginsStore() {
+  const { subscribe, set, update } = writable<Plugin[]>([])
+
+  async function load() {
+    const plugins = await API.getPlugins()
+    set(plugins)
+  }
+
+  async function deletePlugin(pluginId: string) {
+    await API.deletePlugin(pluginId)
+    update(state => {
+      state = state.filter(existing => existing._id !== pluginId)
+      return state
+    })
+  }
+
+  async function createPlugin(source: string, url: string, auth = null) {
+    let pluginData: any = {
+      source,
+      url,
+    }
+
+    switch (source) {
+      case PluginSource.URL:
+        pluginData.headers = auth
+        break
+      case PluginSource.GITHUB:
+        pluginData.githubToken = auth
+        break
+    }
+
+    let res = await API.createPlugin(pluginData)
+    let newPlugin = res.plugin
+    update(state => {
+      const currentIdx = state.findIndex(plugin => plugin._id === newPlugin._id)
+      if (currentIdx >= 0) {
+        state.splice(currentIdx, 1, newPlugin)
+      } else {
+        state.push(newPlugin)
+      }
+      return state
+    })
+  }
+
+  async function uploadPlugin(file: File) {
+    if (!file) {
+      return
+    }
+    let data = new FormData()
+    data.append("file", file)
+    let resp = await API.uploadPlugin(data)
+    let newPlugin = resp.plugins[0]
+    update(state => {
+      const currentIdx = state.findIndex(plugin => plugin._id === newPlugin._id)
+      if (currentIdx >= 0) {
+        state.splice(currentIdx, 1, newPlugin)
+      } else {
+        state.push(newPlugin)
+      }
+      return state
+    })
+  }
+  return {
+    subscribe,
+    load,
+    createPlugin,
+    deletePlugin,
+    uploadPlugin,
+  }
+}
+
+export const plugins = createPluginsStore()