diff --git a/eatery-service/src/main/java/com/drinkool/entities/InventoryItemEntity.java b/eatery-service/src/main/java/com/drinkool/entities/InventoryItemEntity.java
new file mode 100644
index 0000000..397b469
--- /dev/null
+++ b/eatery-service/src/main/java/com/drinkool/entities/InventoryItemEntity.java
@@ -0,0 +1,29 @@
+package com.drinkool.entities;
+
+import jakarta.persistence.Entity;
+import jakarta.persistence.Table;
+import jakarta.transaction.Transactional;
+
+@Entity
+@Table(name = "inventory_items")
+public class InventoryItemEntity extends BaseEntity {
+
+	public String name;
+	public int quantity;
+	public String unit;
+
+	// Create
+	@Transactional
+	public void add(String name, int quantity, String unit) {
+		this.name = name;
+		this.quantity = quantity;
+		this.unit = unit;
+
+		this.persist();
+	}
+
+	@Transactional
+	public void add(String name, int quantity) {
+		add(name, quantity, "unit");
+	}
+}
diff --git a/eatery-service/src/main/java/com/drinkool/services/InventoryService.java b/eatery-service/src/main/java/com/drinkool/services/InventoryService.java
new file mode 100644
index 0000000..1de9561
--- /dev/null
+++ b/eatery-service/src/main/java/com/drinkool/services/InventoryService.java
@@ -0,0 +1,22 @@
+package com.drinkool.services;
+
+import com.drinkool.dtos.AddInventory;
+import com.drinkool.entities.InventoryItemEntity;
+import jakarta.transaction.Transactional;
+import jakarta.ws.rs.*;
+import jakarta.ws.rs.core.Response;
+
+@Path("/api/inventory")
+public class InventoryService {
+
+	@POST
+	@Path("/add")
+	@Transactional
+	public Response add(AddInventory input) {
+		InventoryItemEntity newItem = new InventoryItemEntity();
+
+		newItem.add(input.name, input.quantity, input.unit);
+
+		return Response.ok().build();
+	}
+}
diff --git a/eatery-service/src/test/java/com/drinkool/services/InventoryServiceTest.java b/eatery-service/src/test/java/com/drinkool/services/InventoryServiceTest.java
new file mode 100644
index 0000000..8e396cb
--- /dev/null
+++ b/eatery-service/src/test/java/com/drinkool/services/InventoryServiceTest.java
@@ -0,0 +1,36 @@
+package com.drinkool.services;
+
+import static io.restassured.RestAssured.given;
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+import com.drinkool.dtos.AddInventory;
+import com.drinkool.entities.InventoryItemEntity;
+import io.quarkus.test.junit.QuarkusTest;
+import io.restassured.http.ContentType;
+import java.util.Random;
+import java.util.UUID;
+import org.junit.jupiter.api.Test;
+
+@QuarkusTest
+public class InventoryServiceTest {
+
+	@Test
+	void add() {
+		Random random = new Random();
+
+		String name = UUID.randomUUID().toString();
+
+		AddInventory input = new AddInventory();
+		input.name = name;
+		input.quantity = random.nextInt(100);
+
+		given()
+			.contentType(ContentType.JSON)
+			.body(input)
+			.when()
+			.post("/api/inventory/add")
+			.then();
+
+		assertEquals(1, InventoryItemEntity.find("name", name).count());
+	}
+}
diff --git a/lib/src/main/java/com/drinkool/dtos/AddInventory.java b/lib/src/main/java/com/drinkool/dtos/AddInventory.java
new file mode 100644
index 0000000..470dec2
--- /dev/null
+++ b/lib/src/main/java/com/drinkool/dtos/AddInventory.java
@@ -0,0 +1,7 @@
+package com.drinkool.dtos;
+
+public class AddInventory {
+    public String name;
+    public int quantity;
+    public String unit;
+}