diff --git a/lib/config.ts b/lib/config.ts
index 7a40b45..9df1b31 100644
--- a/lib/config.ts
+++ b/lib/config.ts
@@ -1,7 +1,7 @@
 import { getConsent, inferRegulation } from "./core/regs/consent";
 import type { CMPApiConfig, Consent } from "./core/regs/consent";
 
-type Experiment = "tokenize-v2";
+type Experiment = "tokenize-v2" | "targeting-cascade";
 
 type InitConsent = {
   // A "cmpapi" configuration indicating that consent should be gathered from CMP apis.
diff --git a/lib/edge/targeting.ts b/lib/edge/targeting.ts
index 6c1505f..827459b 100644
--- a/lib/edge/targeting.ts
+++ b/lib/edge/targeting.ts
@@ -27,7 +27,7 @@ type TargetingResponse = {
   ortb2: { user: ortb2.User };
 };
 
-async function Targeting(config: ResolvedConfig, ...ids: readonly string[]): Promise<TargetingResponse> {
+async function Targeting(config: ResolvedConfig, ids: readonly string[]): Promise<TargetingResponse> {
   const searchParams = new URLSearchParams(ids.map((id) => ["id", id]));
   const path = "/v2/targeting?" + searchParams.toString();
 
diff --git a/lib/sdk.test.ts b/lib/sdk.test.ts
index cc75e82..0310a74 100644
--- a/lib/sdk.test.ts
+++ b/lib/sdk.test.ts
@@ -395,8 +395,10 @@ describe("behavior testing of", () => {
       })
     );
 
-    const targetingWithParam = await sdk.targeting("someId", "someOtherId");
-    expect(targetingWithParam).toBeDefined();
+    await expect(sdk.targeting({ ids: ["someId", "someOtherId"] })).rejects.toMatch(/targeting-cascade/);
+
+    sdk.dcn.experiments = ["targeting-cascade"];
+    const targetingWithParam = await sdk.targeting({ ids: ["someId", "someOtherId"] });
 
     expect(fetchSpy).toHaveBeenLastCalledWith(
       expect.objectContaining({
diff --git a/lib/sdk.ts b/lib/sdk.ts
index eb080b9..541607e 100644
--- a/lib/sdk.ts
+++ b/lib/sdk.ts
@@ -20,6 +20,12 @@ import { Profile } from "./edge/profile";
 import { sha256 } from "js-sha256";
 import { Tokenize, TokenizeResponse } from "./edge/tokenize";
 
+type TargetingRequest =
+  | string
+  | {
+      ids?: string[];
+    };
+
 class OptableSDK {
   public static version = buildInfo.version;
 
@@ -54,13 +60,15 @@ class OptableSDK {
     return Uid2Token(this.dcn, id);
   }
 
-  async targeting(...ids: string[]): Promise<TargetingResponse> {
-    if (!ids.length) {
-      ids = ["__passport__"];
+  async targeting(request: TargetingRequest = "__passport__"): Promise<TargetingResponse> {
+    const ids = typeof request === "string" ? [request] : request?.ids || [];
+
+    if (ids.length > 1 && !this.dcn.experiments.includes("targeting-cascade")) {
+      throw "Targeting multiple IDs is only available with the 'targeting-cascade' experiment enabled.";
     }
 
     await this.init;
-    return Targeting(this.dcn, ...ids);
+    return Targeting(this.dcn, ids);
   }
 
   targetingFromCache(): TargetingResponse | null {