diff --git a/packages/backend-core/src/errors/errors.ts b/packages/backend-core/src/errors/errors.ts
index 79aa330de43..2d205f6277b 100644
--- a/packages/backend-core/src/errors/errors.ts
+++ b/packages/backend-core/src/errors/errors.ts
@@ -97,45 +97,15 @@ export class NotImplementedError extends HTTPError {
 }
 
 // LICENSING
-
-export class UsageLimitError extends HTTPError {
-  limitName: string
-
-  constructor(message: string, limitName: string) {
-    super(message, 400, ErrorCode.USAGE_LIMIT_EXCEEDED)
-    this.limitName = limitName
-  }
-
-  getPublicError() {
-    return {
-      limitName: this.limitName,
-    }
+export class FeatureDisabledError extends Error {
+  constructor(feature: string) {
+    super(`Feature disabled: '${feature}'`)
   }
 }
 
-export class FeatureDisabledError extends HTTPError {
-  featureName: string
-
-  constructor(message: string, featureName: string) {
-    super(message, 400, ErrorCode.FEATURE_DISABLED)
-    this.featureName = featureName
-  }
-
-  getPublicError() {
-    return {
-      featureName: this.featureName,
-    }
-  }
-}
-
-// AUTH
-
-export class InvalidAPIKeyError extends BudibaseError {
-  constructor() {
-    super(
-      "Invalid API key - may need re-generated, or user doesn't exist",
-      ErrorCode.INVALID_API_KEY
-    )
+export class UsageLimitError extends Error {
+  constructor(limitName: string) {
+    super(`Usage limit exceeded: '${limitName}'`)
   }
 }
 
diff --git a/packages/backend-core/src/middleware/authenticated.ts b/packages/backend-core/src/middleware/authenticated.ts
index e413db2bf62..0d910262085 100644
--- a/packages/backend-core/src/middleware/authenticated.ts
+++ b/packages/backend-core/src/middleware/authenticated.ts
@@ -16,12 +16,12 @@ import env from "../environment"
 import {
   Ctx,
   EndpointMatcher,
-  ErrorCode,
+  APIWarningCode,
   LoginMethod,
   SessionCookie,
   User,
 } from "@budibase/types"
-import { InvalidAPIKeyError } from "../errors"
+import { InvalidAPIKeyWarning } from "../warnings"
 import tracer from "dd-trace"
 import type { Middleware, Next } from "koa"
 
@@ -91,7 +91,7 @@ async function checkApiKey(
         }),
       }
     } else {
-      throw new InvalidAPIKeyError()
+      throw new InvalidAPIKeyWarning()
     }
   })
 }
@@ -242,7 +242,7 @@ export function authenticated(
       // invalid token, clear the cookie
       if (err?.name === "JsonWebTokenError") {
         clearCookie(ctx, Cookie.Auth)
-      } else if (err?.code === ErrorCode.INVALID_API_KEY) {
+      } else if (err?.code === APIWarningCode.INVALID_API_KEY) {
         ctx.throw(403, err.message)
       }
       // allow configuring for public access
diff --git a/packages/backend-core/src/warnings/index.ts b/packages/backend-core/src/warnings/index.ts
new file mode 100644
index 00000000000..8e9763624d1
--- /dev/null
+++ b/packages/backend-core/src/warnings/index.ts
@@ -0,0 +1 @@
+export * from "./warnings"
diff --git a/packages/backend-core/src/warnings/warnings.ts b/packages/backend-core/src/warnings/warnings.ts
new file mode 100644
index 00000000000..5d0e72d75de
--- /dev/null
+++ b/packages/backend-core/src/warnings/warnings.ts
@@ -0,0 +1,54 @@
+// BASE
+
+import { APIWarningCode } from "@budibase/types"
+
+export abstract class APIWarning extends Error {
+  code: string
+
+  constructor(message: string, code: string) {
+    super(message)
+    this.code = code
+  }
+
+  protected getPublicWarning?(): any
+}
+
+// AUTH
+
+export class InvalidAPIKeyWarning extends APIWarning {
+  constructor() {
+    super("Invalid API key", APIWarningCode.INVALID_API_KEY)
+  }
+}
+
+// LICENSING
+
+export class UsageLimitWarning extends APIWarning {
+  limitName: string
+
+  constructor(message: string, limitName: string) {
+    super(message, APIWarningCode.USAGE_LIMIT_EXCEEDED)
+    this.limitName = limitName
+  }
+
+  getPublicWarning() {
+    return {
+      limitName: this.limitName,
+    }
+  }
+}
+
+export class FeatureDisabledWarning extends APIWarning {
+  featureName: string
+
+  constructor(message: string, featureName: string) {
+    super(message, APIWarningCode.FEATURE_DISABLED)
+    this.featureName = featureName
+  }
+
+  getPublicWarning() {
+    return {
+      featureName: this.featureName,
+    }
+  }
+}
diff --git a/packages/builder/src/components/common/CodeEditor/AIGen.svelte b/packages/builder/src/components/common/CodeEditor/AIGen.svelte
index e3843bbb2af..c3c1ac0a44f 100644
--- a/packages/builder/src/components/common/CodeEditor/AIGen.svelte
+++ b/packages/builder/src/components/common/CodeEditor/AIGen.svelte
@@ -3,7 +3,7 @@
 
   import { createEventDispatcher } from "svelte"
   import { API } from "@/api"
-  import { ErrorCode, type EnrichedBinding } from "@budibase/types"
+  import { APIWarningCode, type EnrichedBinding } from "@budibase/types"
   import analytics, { Events } from "@/analytics"
   import AiInput from "../ai/AIInput.svelte"
 
@@ -51,7 +51,7 @@
     } catch (e: any) {
       console.error(e)
 
-      if ("code" in e && e.code === ErrorCode.USAGE_LIMIT_EXCEEDED) {
+      if ("code" in e && e.code === APIWarningCode.USAGE_LIMIT_EXCEEDED) {
         notifications.error(
           "Monthly usage limit reached. We're exploring options to expand this soon. Questions? Contact support@budibase.com"
         )
diff --git a/packages/server/src/api/controllers/workspace.ts b/packages/server/src/api/controllers/workspace.ts
index d18c51b4e41..20530372712 100644
--- a/packages/server/src/api/controllers/workspace.ts
+++ b/packages/server/src/api/controllers/workspace.ts
@@ -25,7 +25,7 @@ import {
   DeleteWorkspaceResponse,
   DuplicateWorkspaceRequest,
   DuplicateWorkspaceResponse,
-  ErrorCode,
+  APIWarningCode,
   FetchAppDefinitionResponse,
   FetchAppPackageResponse,
   FetchPublishedAppsResponse,
@@ -638,7 +638,7 @@ async function workspacePostCreate(
           return quotas.addRows(rowCount)
         })
       } catch (err: any) {
-        if (err.code && err.code === ErrorCode.USAGE_LIMIT_EXCEEDED) {
+        if (err.code && err.code === APIWarningCode.USAGE_LIMIT_EXCEEDED) {
           // this import resulted in row usage exceeding the quota
           // delete the app
           // skip pre and post-steps as no rows have been added to quotas yet
diff --git a/packages/types/src/api/web/errors.ts b/packages/types/src/api/web/errors.ts
index 9e448701ad3..7ef37d928be 100644
--- a/packages/types/src/api/web/errors.ts
+++ b/packages/types/src/api/web/errors.ts
@@ -6,8 +6,5 @@ export interface APIError {
 }
 
 export enum ErrorCode {
-  USAGE_LIMIT_EXCEEDED = "usage_limit_exceeded",
-  FEATURE_DISABLED = "feature_disabled",
-  INVALID_API_KEY = "invalid_api_key",
   HTTP = "http",
 }
diff --git a/packages/types/src/api/web/index.ts b/packages/types/src/api/web/index.ts
index 57ef85760cf..e38231857a2 100644
--- a/packages/types/src/api/web/index.ts
+++ b/packages/types/src/api/web/index.ts
@@ -6,6 +6,7 @@ export * from "./cookies"
 export * from "./debug"
 export * from "./dev"
 export * from "./errors"
+export * from "./warnings"
 export * from "./global"
 export * from "./pagination"
 export * from "./plugins"
diff --git a/packages/types/src/api/web/warnings.ts b/packages/types/src/api/web/warnings.ts
new file mode 100644
index 00000000000..82edc3939c7
--- /dev/null
+++ b/packages/types/src/api/web/warnings.ts
@@ -0,0 +1,10 @@
+export interface APIWarning {
+  message: string
+  status: number
+}
+
+export enum APIWarningCode {
+  USAGE_LIMIT_EXCEEDED = "usage_limit_exceeded",
+  FEATURE_DISABLED = "feature_disabled",
+  INVALID_API_KEY = "invalid_api_key",
+}
diff --git a/packages/worker/src/api/controllers/global/users.ts b/packages/worker/src/api/controllers/global/users.ts
index 591b4bab2cc..2b9baa06f09 100644
--- a/packages/worker/src/api/controllers/global/users.ts
+++ b/packages/worker/src/api/controllers/global/users.ts
@@ -30,7 +30,7 @@ import {
   DeleteInviteUsersResponse,
   DeleteUserResponse,
   EditUserPermissionsResponse,
-  ErrorCode,
+  APIWarningCode,
   FetchUsersResponse,
   FindUserResponse,
   GetUserInvitesResponse,
@@ -614,7 +614,7 @@ export const inviteAccept = async (
       }
     )
   } catch (err: any) {
-    if (err.code === ErrorCode.USAGE_LIMIT_EXCEEDED) {
+    if (err.code === APIWarningCode.USAGE_LIMIT_EXCEEDED) {
       // explicitly re-throw limit exceeded errors
       ctx.throw(400, err)
     }