diff --git a/.changeset/forty-impalas-fry.md b/.changeset/forty-impalas-fry.md
new file mode 100644
index 000000000..dfc1c5486
--- /dev/null
+++ b/.changeset/forty-impalas-fry.md
@@ -0,0 +1,5 @@
+---
+"inngest": patch
+---
+
+Add `INNGEST_API_BASE_URL` and `INNGEST_EVENT_API_BASE_URL`, used for internal testing
diff --git a/packages/inngest/etc/inngest.api.md b/packages/inngest/etc/inngest.api.md
index cf052d648..375eca40a 100644
--- a/packages/inngest/etc/inngest.api.md
+++ b/packages/inngest/etc/inngest.api.md
@@ -417,8 +417,8 @@ export type ZodEventSchemas = Record<string, {
 
 // Warnings were encountered during analysis:
 //
-// src/components/InngestCommHandler.ts:836:8 - (ae-forgotten-export) The symbol "ExecutionVersion" needs to be exported by the entry point index.d.ts
-// src/components/InngestCommHandler.ts:836:35 - (ae-forgotten-export) The symbol "ExecutionResult" needs to be exported by the entry point index.d.ts
+// src/components/InngestCommHandler.ts:837:8 - (ae-forgotten-export) The symbol "ExecutionVersion" needs to be exported by the entry point index.d.ts
+// src/components/InngestCommHandler.ts:837:35 - (ae-forgotten-export) The symbol "ExecutionResult" needs to be exported by the entry point index.d.ts
 // src/components/InngestMiddleware.ts:264:3 - (ae-forgotten-export) The symbol "InitialRunInfo" needs to be exported by the entry point index.d.ts
 // src/components/InngestMiddleware.ts:277:5 - (ae-forgotten-export) The symbol "MiddlewareRunInput" needs to be exported by the entry point index.d.ts
 // src/components/InngestMiddleware.ts:283:5 - (ae-forgotten-export) The symbol "BlankHook" needs to be exported by the entry point index.d.ts
@@ -428,7 +428,7 @@ export type ZodEventSchemas = Record<string, {
 // src/components/InngestMiddleware.ts:353:3 - (ae-forgotten-export) The symbol "AnyInngest" needs to be exported by the entry point index.d.ts
 // src/components/InngestMiddleware.ts:359:3 - (ae-forgotten-export) The symbol "AnyInngestFunction" needs to be exported by the entry point index.d.ts
 // src/types.ts:76:5 - (ae-forgotten-export) The symbol "failureEventErrorSchema" needs to be exported by the entry point index.d.ts
-// src/types.ts:739:5 - (ae-forgotten-export) The symbol "TimeStrBatch" needs to be exported by the entry point index.d.ts
+// src/types.ts:742:5 - (ae-forgotten-export) The symbol "TimeStrBatch" needs to be exported by the entry point index.d.ts
 
 // (No @packageDocumentation comment for this package)
 
diff --git a/packages/inngest/src/components/Inngest.ts b/packages/inngest/src/components/Inngest.ts
index bdbf6e2ad..d29fbd81b 100644
--- a/packages/inngest/src/components/Inngest.ts
+++ b/packages/inngest/src/components/Inngest.ts
@@ -1,7 +1,7 @@
 import { InngestApi } from "../api/api";
 import {
   defaultDevServerHost,
-  defaultInngestBaseUrl,
+  defaultInngestApiBaseUrl,
   defaultInngestEventBaseUrl,
   dummyEventKey,
   envKeys,
@@ -102,7 +102,8 @@ export class Inngest<TOpts extends ClientOptions = ClientOptions> {
    */
   private eventKey = "";
 
-  private readonly baseUrl: string | undefined;
+  private readonly apiBaseUrl: string | undefined;
+  private readonly eventBaseUrl: string | undefined;
 
   private readonly inngestApi: InngestApi;
 
@@ -162,7 +163,15 @@ export class Inngest<TOpts extends ClientOptions = ClientOptions> {
 
     this.id = id;
 
-    this.baseUrl = baseUrl || processEnv(envKeys.InngestBaseUrl);
+    this.apiBaseUrl =
+      baseUrl ||
+      processEnv(envKeys.InngestApiBaseUrl) ||
+      processEnv(envKeys.InngestBaseUrl);
+
+    this.eventBaseUrl =
+      baseUrl ||
+      processEnv(envKeys.InngestEventApiBaseUrl) ||
+      processEnv(envKeys.InngestBaseUrl);
 
     this.setEventKey(eventKey || processEnv(envKeys.InngestEventKey) || "");
 
@@ -188,7 +197,7 @@ export class Inngest<TOpts extends ClientOptions = ClientOptions> {
     this.fetch = getFetch(fetch);
 
     this.inngestApi = new InngestApi({
-      baseUrl: this.baseUrl || defaultInngestBaseUrl,
+      baseUrl: this.apiBaseUrl || defaultInngestApiBaseUrl,
       signingKey: processEnv(envKeys.InngestSigningKey) || "",
       fetch: this.fetch,
     });
@@ -294,7 +303,7 @@ export class Inngest<TOpts extends ClientOptions = ClientOptions> {
 
     this.sendEventUrl = new URL(
       `e/${this.eventKey}`,
-      this.baseUrl || defaultInngestEventBaseUrl
+      this.eventBaseUrl || defaultInngestEventBaseUrl
     );
   }
 
@@ -413,7 +422,7 @@ export class Inngest<TOpts extends ClientOptions = ClientOptions> {
      * user has set this it means they have already chosen a URL to hit.
      */
     if (!skipDevServer()) {
-      if (!this.baseUrl) {
+      if (!this.eventBaseUrl) {
         const devAvailable = await devServerAvailable(
           defaultDevServerHost,
           this.fetch
diff --git a/packages/inngest/src/components/InngestCommHandler.ts b/packages/inngest/src/components/InngestCommHandler.ts
index ee9a575e8..589d86027 100644
--- a/packages/inngest/src/components/InngestCommHandler.ts
+++ b/packages/inngest/src/components/InngestCommHandler.ts
@@ -5,7 +5,7 @@ import { z } from "zod";
 import { ServerTiming } from "../helpers/ServerTiming";
 import {
   debugPrefix,
-  defaultInngestBaseUrl,
+  defaultInngestApiBaseUrl,
   envKeys,
   headerKeys,
   logPrefix,
@@ -390,9 +390,10 @@ export class InngestCommHandler<
     this.inngestRegisterUrl = new URL(
       "/fn/register",
       options.baseUrl ||
+        this.env[envKeys.InngestApiBaseUrl] ||
         this.env[envKeys.InngestBaseUrl] ||
-        this.client["baseUrl"] ||
-        defaultInngestBaseUrl
+        this.client["apiBaseUrl"] ||
+        defaultInngestApiBaseUrl
     );
 
     this.signingKey = options.signingKey;
@@ -1097,13 +1098,6 @@ export class InngestCommHandler<
         `Use of ${envKeys.InngestDevServerUrl} has been deprecated in v3; please use ${envKeys.InngestBaseUrl} instead. See https://www.inngest.com/docs/sdk/migration`
       );
     }
-
-    if (this.env[envKeys.InngestApiBaseUrl]) {
-      this.log(
-        "warn",
-        `Use of ${envKeys.InngestApiBaseUrl} has been deprecated in v3; please use ${envKeys.InngestBaseUrl} instead. See https://www.inngest.com/docs/sdk/migration`
-      );
-    }
   }
 
   protected validateSignature(sig: string | undefined, body: unknown) {
diff --git a/packages/inngest/src/helpers/consts.ts b/packages/inngest/src/helpers/consts.ts
index ddf02dcbb..f8502d831 100644
--- a/packages/inngest/src/helpers/consts.ts
+++ b/packages/inngest/src/helpers/consts.ts
@@ -25,6 +25,8 @@ export enum envKeys {
   InngestDevServerUrl = "INNGEST_DEVSERVER_URL",
   InngestEnvironment = "INNGEST_ENV",
   InngestBaseUrl = "INNGEST_BASE_URL",
+  InngestEventApiBaseUrl = "INNGEST_EVENT_API_BASE_URL",
+  InngestApiBaseUrl = "INNGEST_API_BASE_URL",
   InngestServeHost = "INNGEST_SERVE_HOST",
   InngestServePath = "INNGEST_SERVE_PATH",
   InngestLogLevel = "INNGEST_LOG_LEVEL",
@@ -32,11 +34,6 @@ export enum envKeys {
 
   BranchName = "BRANCH_NAME",
 
-  /**
-   * @deprecated Removed in v3. Use {@link InngestBaseUrl} instead.
-   */
-  InngestApiBaseUrl = "INNGEST_API_BASE_URL",
-
   /**
    * The git branch of the commit the deployment was triggered by. Example:
    * `improve-about-page`.
@@ -126,7 +123,7 @@ export enum headerKeys {
   RetryAfter = "retry-after",
 }
 
-export const defaultInngestBaseUrl = "https://api.inngest.com/";
+export const defaultInngestApiBaseUrl = "https://api.inngest.com/";
 export const defaultInngestEventBaseUrl = "https://inn.gs/";
 export const defaultDevServerHost = "http://127.0.0.1:8288/";
 
diff --git a/packages/inngest/src/types.ts b/packages/inngest/src/types.ts
index 06262a0fd..4e86b2376 100644
--- a/packages/inngest/src/types.ts
+++ b/packages/inngest/src/types.ts
@@ -716,7 +716,10 @@ export interface FunctionOptions<
    *
    * Specifying just a number means specifying only the concurrency limit.
    */
-  concurrency?: number | ConcurrencyOption | [ConcurrencyOption, ConcurrencyOption];
+  concurrency?:
+    | number
+    | ConcurrencyOption
+    | [ConcurrencyOption, ConcurrencyOption];
 
   /**
    * batchEvents specifies the batch configuration on when this function