diff --git a/docs/swagger.json b/docs/swagger.json
index 4734d44..0a4b917 100644
--- a/docs/swagger.json
+++ b/docs/swagger.json
@@ -3529,6 +3529,63 @@
           }
         ]
       }
+    },
+    "/{restaurant_id}/kpi/ordersCount": {
+      "get": {
+        "tags": ["KPI"],
+        "summary": "Count the number of orders in a given interval, with optional grouping by time slot.",
+        "parameters": [
+          {
+            "name": "restaurant_id",
+            "in": "path",
+            "description": "ID of the restaurant",
+            "required": true,
+            "schema": { "type": "integer" }
+          },
+          {
+            "name": "timeBegin",
+            "in": "query",
+            "description": "Start date/time of the interval (ISO 8601)",
+            "required": true,
+            "schema": { "type": "string", "format": "date-time" }
+          },
+          {
+            "name": "timeEnd",
+            "in": "query",
+            "description": "End date/time of the interval (ISO 8601)",
+            "required": true,
+            "schema": { "type": "string", "format": "date-time" }
+          },
+          {
+            "name": "breakdown",
+            "in": "query",
+            "description": "Slot duration in minutes for grouping (optional)",
+            "required": false,
+            "schema": { "type": "integer" }
+          }
+        ],
+        "responses": {
+          "200": {
+            "description": "Returns either the total number of orders, or an object grouped by time slot.",
+            "content": {
+              "application/json": {
+                "examples": {
+                  "Grouped": {
+                    "value": { "00:00": 5, "00:15": 8 }
+                  },
+                  "Total": {
+                    "value": 23
+                  }
+                }
+              }
+            }
+          },
+          "400": { "description": "Invalid parameters" },
+          "401": { "$ref": "#/components/responses/Unauthorized" },
+          "5XX": { "$ref": "#/components/responses/ServerError" }
+        },
+        "security": [{ "BearerAuth": [] }]
+      }
     }
   },
   "components": {
diff --git a/src/modules/kpi/kpi.controller.ts b/src/modules/kpi/kpi.controller.ts
index 2b1df6d..047f84a 100644
--- a/src/modules/kpi/kpi.controller.ts
+++ b/src/modules/kpi/kpi.controller.ts
@@ -440,4 +440,65 @@ export class KpiController {
       return res;
     }
   }
+
+  /**
+   * Counts the number of orders within a given interval, with optional grouping by time slots (in minutes).
+   * @param idRestaurant - The restaurant identifier (must be positive)
+   * @param timeBegin - Start date/time of the interval (required)
+   * @param timeEnd - End date/time of the interval (required)
+   * @param breakdown - (optional) Slot duration in minutes for grouping
+   * @returns Either the total number of orders, or an object grouped by time slot
+   * @throws {BadRequestException} If parameters are invalid
+   * @throws {InternalServerErrorException} In case of server error
+   * @example
+   * GET /api/1/kpi/ordersCount?timeBegin=2024-01-01T00:00:00Z&timeEnd=2024-01-01T01:00:00Z&breakdown=15
+   * // returns { "00:00": 5, "00:15": 8, ... }
+   * GET /api/1/kpi/ordersCount?timeBegin=2024-01-01T00:00:00Z&timeEnd=2024-01-01T01:00:00Z
+   * // returns 23
+   */
+  @Get('ordersCount')
+  async kpiOrdersCount(
+    @Param('idRestaurant', PositiveNumberPipe) idRestaurant: number,
+    @Query('timeBegin', DatePipe) timeBegin: string,
+    @Query('timeEnd', DatePipe) timeEnd: string,
+    @Query('breakdown') breakdown?: number,
+  ) {
+    if (breakdown) {
+      const slots: { timeBegin: string; timeEnd: string }[] = [];
+      let current = new Date(timeBegin);
+      const end = new Date(timeEnd);
+      const orders = {};
+
+      while (current < end) {
+        const slotStart = new Date(current);
+        const slotEnd = new Date(current.getTime() + breakdown * 60000);
+        slots.push({
+          timeBegin: slotStart.toISOString(),
+          timeEnd: (slotEnd < end ? slotEnd : end).toISOString(),
+        });
+        current = slotEnd;
+      }
+      for (const slot of slots) {
+        const date = new Date(slot.timeBegin);
+        const hours = date.getUTCHours().toString().padStart(2, '0');
+        const minutes = date.getUTCMinutes().toString().padStart(2, '0');
+        orders[`${hours}:${minutes}`] = await this.kpiService.clientsCount(
+          idRestaurant,
+          slot.timeBegin,
+          slot.timeEnd,
+          undefined,
+          undefined,
+        );
+      }
+      return orders;
+    } else {
+      return this.kpiService.clientsCount(
+        idRestaurant,
+        timeBegin,
+        timeEnd,
+        undefined,
+        undefined,
+      );
+    }
+  }
 }