diff --git a/packages/api-server/src/routes/ebay.ts b/packages/api-server/src/routes/ebay.ts
index 0dc04db..a19bcf1 100644
--- a/packages/api-server/src/routes/ebay.ts
+++ b/packages/api-server/src/routes/ebay.ts
@@ -64,9 +64,23 @@ export async function ebayRoute(req: Request): Promise<Response> {
           canadaOnly,
         });
 
-    const results = hideUnstableResults || !maxItems ? items : items.slice(0, maxItems);
+    let results;
+    if (hideUnstableResults) {
+      results = maxItems
+        ? {
+            results: items.results.slice(0, maxItems),
+            unstableResults: items.unstableResults.slice(0, maxItems),
+          }
+        : items;
+    } else {
+      results = maxItems ? items.slice(0, maxItems) : items;
+    }
 
-    if (!results || results.length === 0)
+    const isEmpty = hideUnstableResults
+      ? results.results.length === 0 && results.unstableResults.length === 0
+      : !results || results.length === 0;
+
+    if (isEmpty)
       return Response.json(
         { message: "Search didn't return any results!" },
         { status: 404 },
diff --git a/packages/api-server/test/routes.test.ts b/packages/api-server/test/routes.test.ts
index 0d7f807..e1e3630 100644
--- a/packages/api-server/test/routes.test.ts
+++ b/packages/api-server/test/routes.test.ts
@@ -109,6 +109,13 @@ describe("API routes", () => {
   test("ebayRoute forwards unstableFilter=true to core", async () => {
     const { ebayRoute } = await import("../src/routes/ebay");
 
+    fetchEbayItems.mockImplementation(() =>
+      Promise.resolve({
+        results: [{ title: "item" }],
+        unstableResults: [],
+      }),
+    );
+
     await ebayRoute(
       new Request(
         "http://localhost/api/ebay?q=laptop&buyItNowOnly=true&unstableFilter=true",
@@ -158,4 +165,149 @@ describe("API routes", () => {
       },
     );
   });
+
+  test("facebookRoute does not forward unstableFilter when absent", async () => {
+    const { facebookRoute } = await import("../src/routes/facebook");
+
+    await facebookRoute(
+      new Request(
+        "http://localhost/api/facebook?q=laptop&location=toronto&maxItems=3",
+      ),
+    );
+
+    expect(fetchFacebookItems).toHaveBeenCalledWith("laptop", 1, "toronto", 3);
+  });
+
+  test("facebookRoute does not forward unstableFilter when false", async () => {
+    const { facebookRoute } = await import("../src/routes/facebook");
+
+    await facebookRoute(
+      new Request(
+        "http://localhost/api/facebook?q=laptop&location=toronto&maxItems=3&unstableFilter=false",
+      ),
+    );
+
+    expect(fetchFacebookItems).toHaveBeenCalledWith("laptop", 1, "toronto", 3);
+  });
+
+  test("ebayRoute does not forward unstableFilter when absent", async () => {
+    const { ebayRoute } = await import("../src/routes/ebay");
+
+    await ebayRoute(
+      new Request(
+        "http://localhost/api/ebay?q=laptop&buyItNowOnly=true",
+      ),
+    );
+
+    expect(fetchEbayItems).toHaveBeenCalledWith("laptop", 1, {
+      minPrice: undefined,
+      maxPrice: undefined,
+      strictMode: false,
+      exclusions: [],
+      keywords: ["laptop"],
+      buyItNowOnly: true,
+      canadaOnly: true,
+    });
+  });
+
+  test("ebayRoute does not forward unstableFilter when false", async () => {
+    const { ebayRoute } = await import("../src/routes/ebay");
+
+    await ebayRoute(
+      new Request(
+        "http://localhost/api/ebay?q=laptop&buyItNowOnly=true&unstableFilter=false",
+      ),
+    );
+
+    expect(fetchEbayItems).toHaveBeenCalledWith("laptop", 1, {
+      minPrice: undefined,
+      maxPrice: undefined,
+      strictMode: false,
+      exclusions: [],
+      keywords: ["laptop"],
+      buyItNowOnly: true,
+      canadaOnly: true,
+    });
+  });
+
+  test("kijijiRoute does not forward unstableFilter when absent", async () => {
+    const { kijijiRoute } = await import("../src/routes/kijiji");
+
+    await kijijiRoute(
+      new Request(
+        "http://localhost/api/kijiji?q=laptop&maxPages=5",
+      ),
+    );
+
+    expect(fetchKijijiItems).toHaveBeenCalledWith(
+      "laptop",
+      4,
+      "https://www.kijiji.ca",
+      {
+        location: undefined,
+        category: undefined,
+        keywords: undefined,
+        sortBy: null,
+        sortOrder: null,
+        maxPages: 5,
+        priceMin: undefined,
+        priceMax: undefined,
+        cookies: undefined,
+      },
+      {},
+    );
+  });
+
+  test("kijijiRoute does not forward unstableFilter when false", async () => {
+    const { kijijiRoute } = await import("../src/routes/kijiji");
+
+    await kijijiRoute(
+      new Request(
+        "http://localhost/api/kijiji?q=laptop&maxPages=5&unstableFilter=false",
+      ),
+    );
+
+    expect(fetchKijijiItems).toHaveBeenCalledWith(
+      "laptop",
+      4,
+      "https://www.kijiji.ca",
+      {
+        location: undefined,
+        category: undefined,
+        keywords: undefined,
+        sortBy: null,
+        sortOrder: null,
+        maxPages: 5,
+        priceMin: undefined,
+        priceMax: undefined,
+        cookies: undefined,
+      },
+      {},
+    );
+  });
+
+  test("ebayRoute applies maxItems in unstable mode", async () => {
+    const { ebayRoute } = await import("../src/routes/ebay");
+
+    fetchEbayItems.mockImplementation(() =>
+      Promise.resolve({
+        results: [{ title: "a" }, { title: "b" }, { title: "c" }],
+        unstableResults: [{ title: "d" }, { title: "e" }],
+      }),
+    );
+
+    const response = await ebayRoute(
+      new Request(
+        "http://localhost/api/ebay?q=laptop&unstableFilter=true&maxItems=2",
+      ),
+    );
+
+    const body = await response.json();
+    expect(body.results).toHaveLength(2);
+    expect(body.unstableResults).toHaveLength(2);
+    expect(body.results[0].title).toBe("a");
+    expect(body.results[1].title).toBe("b");
+    expect(body.unstableResults[0].title).toBe("d");
+    expect(body.unstableResults[1].title).toBe("e");
+  });
 });