diff --git a/demo/demo.ts b/demo/demo.ts
index bbc5cb8..a11f3bd 100644
--- a/demo/demo.ts
+++ b/demo/demo.ts
@@ -93,7 +93,11 @@ setupForm("#save-token", async () => {
 });
 setupForm("#productos", () => getProductos(HOST, token(), {}));
 setupForm("#publicaciones", () => getPublications(HOST, token(), {}));
-setupForm("#price", () => getPrices(HOST, token(), {}));
+setupForm("#price", (event) =>
+  getPrices(HOST, token(), {
+    filter: (event.target! as any).filter.value,
+  })
+);
 setupForm("#price-by-customer", (event) =>
   getPricesByCustomer(HOST, token(), {
     filter: (event.target! as any).filter.value,
diff --git a/demo/index.html b/demo/index.html
index a427c55..111431f 100644
--- a/demo/index.html
+++ b/demo/index.html
@@ -56,6 +56,7 @@
 
 <form id="price">
   <button>Conseguir precios</button>
+  <input name="filter" type="text" placeholder="Filtro por lista de precios (ID, opcional)" />
   <p class="status"></p>
 </form>