diff --git a/app/src/main/java/keijumt/devandroid/api/PostalCodeApi.kt b/app/src/main/java/keijumt/devandroid/api/PostalCodeApi.kt
new file mode 100644
index 0000000..1a2a141
--- /dev/null
+++ b/app/src/main/java/keijumt/devandroid/api/PostalCodeApi.kt
@@ -0,0 +1,12 @@
+package keijumt.devandroid.api
+
+import io.reactivex.Single
+import keijumt.devandroid.api.response.PostalCode
+import retrofit2.http.GET
+import retrofit2.http.Query
+
+interface PostalCodeApi {
+
+    @GET("search")
+    fun getPostalCode(@Query("zipcode") zipcode: Int): Single<PostalCode>
+}
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