diff --git a/modules/openapi-generator/src/main/resources/kotlin-client/api.mustache b/modules/openapi-generator/src/main/resources/kotlin-client/api.mustache
index 485b0bed9b59..33c596d09599 100644
--- a/modules/openapi-generator/src/main/resources/kotlin-client/api.mustache
+++ b/modules/openapi-generator/src/main/resources/kotlin-client/api.mustache
@@ -17,7 +17,13 @@ import {{packageName}}.infrastructure.Success
 import {{packageName}}.infrastructure.toMultiValue
 
 {{#operations}}
-{{#nonPublicApi}}internal {{/nonPublicApi}}class {{classname}}(basePath: kotlin.String = "{{{basePath}}}") : ApiClient(basePath) {
+{{#nonPublicApi}}internal {{/nonPublicApi}}class {{classname}}(basePath: kotlin.String = defaultBasePath) : ApiClient(basePath) {
+    companion object {
+        @JvmStatic
+        val defaultBasePath: String by lazy {
+            System.getProperties().getProperty("{{packageName}}.baseUrl", "{{{basePath}}}")
+        }
+    }
 
     {{#operation}}
     /**
diff --git a/modules/openapi-generator/src/main/resources/kotlin-client/libraries/jvm-retrofit2/infrastructure/ApiClient.kt.mustache b/modules/openapi-generator/src/main/resources/kotlin-client/libraries/jvm-retrofit2/infrastructure/ApiClient.kt.mustache
index eab46f77ad48..723be88b00a3 100644
--- a/modules/openapi-generator/src/main/resources/kotlin-client/libraries/jvm-retrofit2/infrastructure/ApiClient.kt.mustache
+++ b/modules/openapi-generator/src/main/resources/kotlin-client/libraries/jvm-retrofit2/infrastructure/ApiClient.kt.mustache
@@ -11,9 +11,16 @@ import retrofit2.converter.moshi.MoshiConverterFactory
 {{/moshi}}
 
 {{#nonPublicApi}}internal {{/nonPublicApi}}class ApiClient(
-    private var baseUrl: String = "{{{basePath}}}",
+    private var baseUrl: String = defaultBasePath,
     private var okHttpClient: OkHttpClient
 ) {
+    companion object {
+        @JvmStatic
+        val defaultBasePath: String by lazy {
+            System.getProperties().getProperty("{{packageName}}.baseUrl", "{{{basePath}}}")
+        }
+    }
+
     init {
         normalizeBaseUrl()
     }
diff --git a/samples/client/petstore/kotlin-gson/src/main/kotlin/org/openapitools/client/apis/PetApi.kt b/samples/client/petstore/kotlin-gson/src/main/kotlin/org/openapitools/client/apis/PetApi.kt
index a2698dc47ea0..e1f24025fedd 100644
--- a/samples/client/petstore/kotlin-gson/src/main/kotlin/org/openapitools/client/apis/PetApi.kt
+++ b/samples/client/petstore/kotlin-gson/src/main/kotlin/org/openapitools/client/apis/PetApi.kt
@@ -26,7 +26,13 @@ import org.openapitools.client.infrastructure.ResponseType
 import org.openapitools.client.infrastructure.Success
 import org.openapitools.client.infrastructure.toMultiValue
 
-class PetApi(basePath: kotlin.String = "http://petstore.swagger.io/v2") : ApiClient(basePath) {
+class PetApi(basePath: kotlin.String = defaultBasePath) : ApiClient(basePath) {
+    companion object {
+        @JvmStatic
+        val defaultBasePath: String by lazy {
+            System.getProperties().getProperty("org.openapitools.client.baseUrl", "http://petstore.swagger.io/v2")
+        }
+    }
 
     /**
     * Add a new pet to the store
diff --git a/samples/client/petstore/kotlin-gson/src/main/kotlin/org/openapitools/client/apis/StoreApi.kt b/samples/client/petstore/kotlin-gson/src/main/kotlin/org/openapitools/client/apis/StoreApi.kt
index 1399a0ca1cf7..08822c67e32a 100644
--- a/samples/client/petstore/kotlin-gson/src/main/kotlin/org/openapitools/client/apis/StoreApi.kt
+++ b/samples/client/petstore/kotlin-gson/src/main/kotlin/org/openapitools/client/apis/StoreApi.kt
@@ -25,7 +25,13 @@ import org.openapitools.client.infrastructure.ResponseType
 import org.openapitools.client.infrastructure.Success
 import org.openapitools.client.infrastructure.toMultiValue
 
-class StoreApi(basePath: kotlin.String = "http://petstore.swagger.io/v2") : ApiClient(basePath) {
+class StoreApi(basePath: kotlin.String = defaultBasePath) : ApiClient(basePath) {
+    companion object {
+        @JvmStatic
+        val defaultBasePath: String by lazy {
+            System.getProperties().getProperty("org.openapitools.client.baseUrl", "http://petstore.swagger.io/v2")
+        }
+    }
 
     /**
     * Delete purchase order by ID
diff --git a/samples/client/petstore/kotlin-gson/src/main/kotlin/org/openapitools/client/apis/UserApi.kt b/samples/client/petstore/kotlin-gson/src/main/kotlin/org/openapitools/client/apis/UserApi.kt
index a7d99762fd8c..1e6e81fc1e91 100644
--- a/samples/client/petstore/kotlin-gson/src/main/kotlin/org/openapitools/client/apis/UserApi.kt
+++ b/samples/client/petstore/kotlin-gson/src/main/kotlin/org/openapitools/client/apis/UserApi.kt
@@ -25,7 +25,13 @@ import org.openapitools.client.infrastructure.ResponseType
 import org.openapitools.client.infrastructure.Success
 import org.openapitools.client.infrastructure.toMultiValue
 
-class UserApi(basePath: kotlin.String = "http://petstore.swagger.io/v2") : ApiClient(basePath) {
+class UserApi(basePath: kotlin.String = defaultBasePath) : ApiClient(basePath) {
+    companion object {
+        @JvmStatic
+        val defaultBasePath: String by lazy {
+            System.getProperties().getProperty("org.openapitools.client.baseUrl", "http://petstore.swagger.io/v2")
+        }
+    }
 
     /**
     * Create user
diff --git a/samples/client/petstore/kotlin-jackson/src/main/kotlin/org/openapitools/client/apis/PetApi.kt b/samples/client/petstore/kotlin-jackson/src/main/kotlin/org/openapitools/client/apis/PetApi.kt
index a2698dc47ea0..e1f24025fedd 100644
--- a/samples/client/petstore/kotlin-jackson/src/main/kotlin/org/openapitools/client/apis/PetApi.kt
+++ b/samples/client/petstore/kotlin-jackson/src/main/kotlin/org/openapitools/client/apis/PetApi.kt
@@ -26,7 +26,13 @@ import org.openapitools.client.infrastructure.ResponseType
 import org.openapitools.client.infrastructure.Success
 import org.openapitools.client.infrastructure.toMultiValue
 
-class PetApi(basePath: kotlin.String = "http://petstore.swagger.io/v2") : ApiClient(basePath) {
+class PetApi(basePath: kotlin.String = defaultBasePath) : ApiClient(basePath) {
+    companion object {
+        @JvmStatic
+        val defaultBasePath: String by lazy {
+            System.getProperties().getProperty("org.openapitools.client.baseUrl", "http://petstore.swagger.io/v2")
+        }
+    }
 
     /**
     * Add a new pet to the store
diff --git a/samples/client/petstore/kotlin-jackson/src/main/kotlin/org/openapitools/client/apis/StoreApi.kt b/samples/client/petstore/kotlin-jackson/src/main/kotlin/org/openapitools/client/apis/StoreApi.kt
index 1399a0ca1cf7..08822c67e32a 100644
--- a/samples/client/petstore/kotlin-jackson/src/main/kotlin/org/openapitools/client/apis/StoreApi.kt
+++ b/samples/client/petstore/kotlin-jackson/src/main/kotlin/org/openapitools/client/apis/StoreApi.kt
@@ -25,7 +25,13 @@ import org.openapitools.client.infrastructure.ResponseType
 import org.openapitools.client.infrastructure.Success
 import org.openapitools.client.infrastructure.toMultiValue
 
-class StoreApi(basePath: kotlin.String = "http://petstore.swagger.io/v2") : ApiClient(basePath) {
+class StoreApi(basePath: kotlin.String = defaultBasePath) : ApiClient(basePath) {
+    companion object {
+        @JvmStatic
+        val defaultBasePath: String by lazy {
+            System.getProperties().getProperty("org.openapitools.client.baseUrl", "http://petstore.swagger.io/v2")
+        }
+    }
 
     /**
     * Delete purchase order by ID
diff --git a/samples/client/petstore/kotlin-jackson/src/main/kotlin/org/openapitools/client/apis/UserApi.kt b/samples/client/petstore/kotlin-jackson/src/main/kotlin/org/openapitools/client/apis/UserApi.kt
index a7d99762fd8c..1e6e81fc1e91 100644
--- a/samples/client/petstore/kotlin-jackson/src/main/kotlin/org/openapitools/client/apis/UserApi.kt
+++ b/samples/client/petstore/kotlin-jackson/src/main/kotlin/org/openapitools/client/apis/UserApi.kt
@@ -25,7 +25,13 @@ import org.openapitools.client.infrastructure.ResponseType
 import org.openapitools.client.infrastructure.Success
 import org.openapitools.client.infrastructure.toMultiValue
 
-class UserApi(basePath: kotlin.String = "http://petstore.swagger.io/v2") : ApiClient(basePath) {
+class UserApi(basePath: kotlin.String = defaultBasePath) : ApiClient(basePath) {
+    companion object {
+        @JvmStatic
+        val defaultBasePath: String by lazy {
+            System.getProperties().getProperty("org.openapitools.client.baseUrl", "http://petstore.swagger.io/v2")
+        }
+    }
 
     /**
     * Create user
diff --git a/samples/client/petstore/kotlin-json-request-string/src/main/kotlin/org/openapitools/client/apis/PetApi.kt b/samples/client/petstore/kotlin-json-request-string/src/main/kotlin/org/openapitools/client/apis/PetApi.kt
index d5906cbd6564..d6470e48d721 100644
--- a/samples/client/petstore/kotlin-json-request-string/src/main/kotlin/org/openapitools/client/apis/PetApi.kt
+++ b/samples/client/petstore/kotlin-json-request-string/src/main/kotlin/org/openapitools/client/apis/PetApi.kt
@@ -26,7 +26,13 @@ import org.openapitools.client.infrastructure.ResponseType
 import org.openapitools.client.infrastructure.Success
 import org.openapitools.client.infrastructure.toMultiValue
 
-class PetApi(basePath: kotlin.String = "http://petstore.swagger.io/v2") : ApiClient(basePath) {
+class PetApi(basePath: kotlin.String = defaultBasePath) : ApiClient(basePath) {
+    companion object {
+        @JvmStatic
+        val defaultBasePath: String by lazy {
+            System.getProperties().getProperty("org.openapitools.client.baseUrl", "http://petstore.swagger.io/v2")
+        }
+    }
 
     /**
     * Add a new pet to the store
diff --git a/samples/client/petstore/kotlin-json-request-string/src/main/kotlin/org/openapitools/client/apis/StoreApi.kt b/samples/client/petstore/kotlin-json-request-string/src/main/kotlin/org/openapitools/client/apis/StoreApi.kt
index 1399a0ca1cf7..08822c67e32a 100644
--- a/samples/client/petstore/kotlin-json-request-string/src/main/kotlin/org/openapitools/client/apis/StoreApi.kt
+++ b/samples/client/petstore/kotlin-json-request-string/src/main/kotlin/org/openapitools/client/apis/StoreApi.kt
@@ -25,7 +25,13 @@ import org.openapitools.client.infrastructure.ResponseType
 import org.openapitools.client.infrastructure.Success
 import org.openapitools.client.infrastructure.toMultiValue
 
-class StoreApi(basePath: kotlin.String = "http://petstore.swagger.io/v2") : ApiClient(basePath) {
+class StoreApi(basePath: kotlin.String = defaultBasePath) : ApiClient(basePath) {
+    companion object {
+        @JvmStatic
+        val defaultBasePath: String by lazy {
+            System.getProperties().getProperty("org.openapitools.client.baseUrl", "http://petstore.swagger.io/v2")
+        }
+    }
 
     /**
     * Delete purchase order by ID
diff --git a/samples/client/petstore/kotlin-json-request-string/src/main/kotlin/org/openapitools/client/apis/UserApi.kt b/samples/client/petstore/kotlin-json-request-string/src/main/kotlin/org/openapitools/client/apis/UserApi.kt
index a7d99762fd8c..1e6e81fc1e91 100644
--- a/samples/client/petstore/kotlin-json-request-string/src/main/kotlin/org/openapitools/client/apis/UserApi.kt
+++ b/samples/client/petstore/kotlin-json-request-string/src/main/kotlin/org/openapitools/client/apis/UserApi.kt
@@ -25,7 +25,13 @@ import org.openapitools.client.infrastructure.ResponseType
 import org.openapitools.client.infrastructure.Success
 import org.openapitools.client.infrastructure.toMultiValue
 
-class UserApi(basePath: kotlin.String = "http://petstore.swagger.io/v2") : ApiClient(basePath) {
+class UserApi(basePath: kotlin.String = defaultBasePath) : ApiClient(basePath) {
+    companion object {
+        @JvmStatic
+        val defaultBasePath: String by lazy {
+            System.getProperties().getProperty("org.openapitools.client.baseUrl", "http://petstore.swagger.io/v2")
+        }
+    }
 
     /**
     * Create user
diff --git a/samples/client/petstore/kotlin-moshi-codegen/src/main/kotlin/org/openapitools/client/apis/PetApi.kt b/samples/client/petstore/kotlin-moshi-codegen/src/main/kotlin/org/openapitools/client/apis/PetApi.kt
index a2698dc47ea0..e1f24025fedd 100644
--- a/samples/client/petstore/kotlin-moshi-codegen/src/main/kotlin/org/openapitools/client/apis/PetApi.kt
+++ b/samples/client/petstore/kotlin-moshi-codegen/src/main/kotlin/org/openapitools/client/apis/PetApi.kt
@@ -26,7 +26,13 @@ import org.openapitools.client.infrastructure.ResponseType
 import org.openapitools.client.infrastructure.Success
 import org.openapitools.client.infrastructure.toMultiValue
 
-class PetApi(basePath: kotlin.String = "http://petstore.swagger.io/v2") : ApiClient(basePath) {
+class PetApi(basePath: kotlin.String = defaultBasePath) : ApiClient(basePath) {
+    companion object {
+        @JvmStatic
+        val defaultBasePath: String by lazy {
+            System.getProperties().getProperty("org.openapitools.client.baseUrl", "http://petstore.swagger.io/v2")
+        }
+    }
 
     /**
     * Add a new pet to the store
diff --git a/samples/client/petstore/kotlin-moshi-codegen/src/main/kotlin/org/openapitools/client/apis/StoreApi.kt b/samples/client/petstore/kotlin-moshi-codegen/src/main/kotlin/org/openapitools/client/apis/StoreApi.kt
index 1399a0ca1cf7..08822c67e32a 100644
--- a/samples/client/petstore/kotlin-moshi-codegen/src/main/kotlin/org/openapitools/client/apis/StoreApi.kt
+++ b/samples/client/petstore/kotlin-moshi-codegen/src/main/kotlin/org/openapitools/client/apis/StoreApi.kt
@@ -25,7 +25,13 @@ import org.openapitools.client.infrastructure.ResponseType
 import org.openapitools.client.infrastructure.Success
 import org.openapitools.client.infrastructure.toMultiValue
 
-class StoreApi(basePath: kotlin.String = "http://petstore.swagger.io/v2") : ApiClient(basePath) {
+class StoreApi(basePath: kotlin.String = defaultBasePath) : ApiClient(basePath) {
+    companion object {
+        @JvmStatic
+        val defaultBasePath: String by lazy {
+            System.getProperties().getProperty("org.openapitools.client.baseUrl", "http://petstore.swagger.io/v2")
+        }
+    }
 
     /**
     * Delete purchase order by ID
diff --git a/samples/client/petstore/kotlin-moshi-codegen/src/main/kotlin/org/openapitools/client/apis/UserApi.kt b/samples/client/petstore/kotlin-moshi-codegen/src/main/kotlin/org/openapitools/client/apis/UserApi.kt
index a7d99762fd8c..1e6e81fc1e91 100644
--- a/samples/client/petstore/kotlin-moshi-codegen/src/main/kotlin/org/openapitools/client/apis/UserApi.kt
+++ b/samples/client/petstore/kotlin-moshi-codegen/src/main/kotlin/org/openapitools/client/apis/UserApi.kt
@@ -25,7 +25,13 @@ import org.openapitools.client.infrastructure.ResponseType
 import org.openapitools.client.infrastructure.Success
 import org.openapitools.client.infrastructure.toMultiValue
 
-class UserApi(basePath: kotlin.String = "http://petstore.swagger.io/v2") : ApiClient(basePath) {
+class UserApi(basePath: kotlin.String = defaultBasePath) : ApiClient(basePath) {
+    companion object {
+        @JvmStatic
+        val defaultBasePath: String by lazy {
+            System.getProperties().getProperty("org.openapitools.client.baseUrl", "http://petstore.swagger.io/v2")
+        }
+    }
 
     /**
     * Create user
diff --git a/samples/client/petstore/kotlin-nonpublic/src/main/kotlin/org/openapitools/client/apis/PetApi.kt b/samples/client/petstore/kotlin-nonpublic/src/main/kotlin/org/openapitools/client/apis/PetApi.kt
index 50770e4c7451..a2f79242657d 100644
--- a/samples/client/petstore/kotlin-nonpublic/src/main/kotlin/org/openapitools/client/apis/PetApi.kt
+++ b/samples/client/petstore/kotlin-nonpublic/src/main/kotlin/org/openapitools/client/apis/PetApi.kt
@@ -26,7 +26,13 @@ import org.openapitools.client.infrastructure.ResponseType
 import org.openapitools.client.infrastructure.Success
 import org.openapitools.client.infrastructure.toMultiValue
 
-internal class PetApi(basePath: kotlin.String = "http://petstore.swagger.io/v2") : ApiClient(basePath) {
+internal class PetApi(basePath: kotlin.String = defaultBasePath) : ApiClient(basePath) {
+    companion object {
+        @JvmStatic
+        val defaultBasePath: String by lazy {
+            System.getProperties().getProperty("org.openapitools.client.baseUrl", "http://petstore.swagger.io/v2")
+        }
+    }
 
     /**
     * Add a new pet to the store
diff --git a/samples/client/petstore/kotlin-nonpublic/src/main/kotlin/org/openapitools/client/apis/StoreApi.kt b/samples/client/petstore/kotlin-nonpublic/src/main/kotlin/org/openapitools/client/apis/StoreApi.kt
index 893601a3220a..4f8898adf9b3 100644
--- a/samples/client/petstore/kotlin-nonpublic/src/main/kotlin/org/openapitools/client/apis/StoreApi.kt
+++ b/samples/client/petstore/kotlin-nonpublic/src/main/kotlin/org/openapitools/client/apis/StoreApi.kt
@@ -25,7 +25,13 @@ import org.openapitools.client.infrastructure.ResponseType
 import org.openapitools.client.infrastructure.Success
 import org.openapitools.client.infrastructure.toMultiValue
 
-internal class StoreApi(basePath: kotlin.String = "http://petstore.swagger.io/v2") : ApiClient(basePath) {
+internal class StoreApi(basePath: kotlin.String = defaultBasePath) : ApiClient(basePath) {
+    companion object {
+        @JvmStatic
+        val defaultBasePath: String by lazy {
+            System.getProperties().getProperty("org.openapitools.client.baseUrl", "http://petstore.swagger.io/v2")
+        }
+    }
 
     /**
     * Delete purchase order by ID
diff --git a/samples/client/petstore/kotlin-nonpublic/src/main/kotlin/org/openapitools/client/apis/UserApi.kt b/samples/client/petstore/kotlin-nonpublic/src/main/kotlin/org/openapitools/client/apis/UserApi.kt
index d486ee7dc52b..eba7b8392e8d 100644
--- a/samples/client/petstore/kotlin-nonpublic/src/main/kotlin/org/openapitools/client/apis/UserApi.kt
+++ b/samples/client/petstore/kotlin-nonpublic/src/main/kotlin/org/openapitools/client/apis/UserApi.kt
@@ -25,7 +25,13 @@ import org.openapitools.client.infrastructure.ResponseType
 import org.openapitools.client.infrastructure.Success
 import org.openapitools.client.infrastructure.toMultiValue
 
-internal class UserApi(basePath: kotlin.String = "http://petstore.swagger.io/v2") : ApiClient(basePath) {
+internal class UserApi(basePath: kotlin.String = defaultBasePath) : ApiClient(basePath) {
+    companion object {
+        @JvmStatic
+        val defaultBasePath: String by lazy {
+            System.getProperties().getProperty("org.openapitools.client.baseUrl", "http://petstore.swagger.io/v2")
+        }
+    }
 
     /**
     * Create user
diff --git a/samples/client/petstore/kotlin-nullable/src/main/kotlin/org/openapitools/client/apis/PetApi.kt b/samples/client/petstore/kotlin-nullable/src/main/kotlin/org/openapitools/client/apis/PetApi.kt
index cf797f67c9f4..cdb5ac18715b 100644
--- a/samples/client/petstore/kotlin-nullable/src/main/kotlin/org/openapitools/client/apis/PetApi.kt
+++ b/samples/client/petstore/kotlin-nullable/src/main/kotlin/org/openapitools/client/apis/PetApi.kt
@@ -26,7 +26,13 @@ import org.openapitools.client.infrastructure.ResponseType
 import org.openapitools.client.infrastructure.Success
 import org.openapitools.client.infrastructure.toMultiValue
 
-class PetApi(basePath: kotlin.String = "http://petstore.swagger.io/v2") : ApiClient(basePath) {
+class PetApi(basePath: kotlin.String = defaultBasePath) : ApiClient(basePath) {
+    companion object {
+        @JvmStatic
+        val defaultBasePath: String by lazy {
+            System.getProperties().getProperty("org.openapitools.client.baseUrl", "http://petstore.swagger.io/v2")
+        }
+    }
 
     /**
     * Add a new pet to the store
diff --git a/samples/client/petstore/kotlin-nullable/src/main/kotlin/org/openapitools/client/apis/StoreApi.kt b/samples/client/petstore/kotlin-nullable/src/main/kotlin/org/openapitools/client/apis/StoreApi.kt
index a2deaaa89d1d..b9dd7b38f59b 100644
--- a/samples/client/petstore/kotlin-nullable/src/main/kotlin/org/openapitools/client/apis/StoreApi.kt
+++ b/samples/client/petstore/kotlin-nullable/src/main/kotlin/org/openapitools/client/apis/StoreApi.kt
@@ -25,7 +25,13 @@ import org.openapitools.client.infrastructure.ResponseType
 import org.openapitools.client.infrastructure.Success
 import org.openapitools.client.infrastructure.toMultiValue
 
-class StoreApi(basePath: kotlin.String = "http://petstore.swagger.io/v2") : ApiClient(basePath) {
+class StoreApi(basePath: kotlin.String = defaultBasePath) : ApiClient(basePath) {
+    companion object {
+        @JvmStatic
+        val defaultBasePath: String by lazy {
+            System.getProperties().getProperty("org.openapitools.client.baseUrl", "http://petstore.swagger.io/v2")
+        }
+    }
 
     /**
     * Delete purchase order by ID
diff --git a/samples/client/petstore/kotlin-nullable/src/main/kotlin/org/openapitools/client/apis/UserApi.kt b/samples/client/petstore/kotlin-nullable/src/main/kotlin/org/openapitools/client/apis/UserApi.kt
index d4f2f9f8c249..14ce7aa5f54a 100644
--- a/samples/client/petstore/kotlin-nullable/src/main/kotlin/org/openapitools/client/apis/UserApi.kt
+++ b/samples/client/petstore/kotlin-nullable/src/main/kotlin/org/openapitools/client/apis/UserApi.kt
@@ -25,7 +25,13 @@ import org.openapitools.client.infrastructure.ResponseType
 import org.openapitools.client.infrastructure.Success
 import org.openapitools.client.infrastructure.toMultiValue
 
-class UserApi(basePath: kotlin.String = "http://petstore.swagger.io/v2") : ApiClient(basePath) {
+class UserApi(basePath: kotlin.String = defaultBasePath) : ApiClient(basePath) {
+    companion object {
+        @JvmStatic
+        val defaultBasePath: String by lazy {
+            System.getProperties().getProperty("org.openapitools.client.baseUrl", "http://petstore.swagger.io/v2")
+        }
+    }
 
     /**
     * Create user
diff --git a/samples/client/petstore/kotlin-okhttp3/src/main/kotlin/org/openapitools/client/apis/PetApi.kt b/samples/client/petstore/kotlin-okhttp3/src/main/kotlin/org/openapitools/client/apis/PetApi.kt
index a2698dc47ea0..e1f24025fedd 100644
--- a/samples/client/petstore/kotlin-okhttp3/src/main/kotlin/org/openapitools/client/apis/PetApi.kt
+++ b/samples/client/petstore/kotlin-okhttp3/src/main/kotlin/org/openapitools/client/apis/PetApi.kt
@@ -26,7 +26,13 @@ import org.openapitools.client.infrastructure.ResponseType
 import org.openapitools.client.infrastructure.Success
 import org.openapitools.client.infrastructure.toMultiValue
 
-class PetApi(basePath: kotlin.String = "http://petstore.swagger.io/v2") : ApiClient(basePath) {
+class PetApi(basePath: kotlin.String = defaultBasePath) : ApiClient(basePath) {
+    companion object {
+        @JvmStatic
+        val defaultBasePath: String by lazy {
+            System.getProperties().getProperty("org.openapitools.client.baseUrl", "http://petstore.swagger.io/v2")
+        }
+    }
 
     /**
     * Add a new pet to the store
diff --git a/samples/client/petstore/kotlin-okhttp3/src/main/kotlin/org/openapitools/client/apis/StoreApi.kt b/samples/client/petstore/kotlin-okhttp3/src/main/kotlin/org/openapitools/client/apis/StoreApi.kt
index 1399a0ca1cf7..08822c67e32a 100644
--- a/samples/client/petstore/kotlin-okhttp3/src/main/kotlin/org/openapitools/client/apis/StoreApi.kt
+++ b/samples/client/petstore/kotlin-okhttp3/src/main/kotlin/org/openapitools/client/apis/StoreApi.kt
@@ -25,7 +25,13 @@ import org.openapitools.client.infrastructure.ResponseType
 import org.openapitools.client.infrastructure.Success
 import org.openapitools.client.infrastructure.toMultiValue
 
-class StoreApi(basePath: kotlin.String = "http://petstore.swagger.io/v2") : ApiClient(basePath) {
+class StoreApi(basePath: kotlin.String = defaultBasePath) : ApiClient(basePath) {
+    companion object {
+        @JvmStatic
+        val defaultBasePath: String by lazy {
+            System.getProperties().getProperty("org.openapitools.client.baseUrl", "http://petstore.swagger.io/v2")
+        }
+    }
 
     /**
     * Delete purchase order by ID
diff --git a/samples/client/petstore/kotlin-okhttp3/src/main/kotlin/org/openapitools/client/apis/UserApi.kt b/samples/client/petstore/kotlin-okhttp3/src/main/kotlin/org/openapitools/client/apis/UserApi.kt
index a7d99762fd8c..1e6e81fc1e91 100644
--- a/samples/client/petstore/kotlin-okhttp3/src/main/kotlin/org/openapitools/client/apis/UserApi.kt
+++ b/samples/client/petstore/kotlin-okhttp3/src/main/kotlin/org/openapitools/client/apis/UserApi.kt
@@ -25,7 +25,13 @@ import org.openapitools.client.infrastructure.ResponseType
 import org.openapitools.client.infrastructure.Success
 import org.openapitools.client.infrastructure.toMultiValue
 
-class UserApi(basePath: kotlin.String = "http://petstore.swagger.io/v2") : ApiClient(basePath) {
+class UserApi(basePath: kotlin.String = defaultBasePath) : ApiClient(basePath) {
+    companion object {
+        @JvmStatic
+        val defaultBasePath: String by lazy {
+            System.getProperties().getProperty("org.openapitools.client.baseUrl", "http://petstore.swagger.io/v2")
+        }
+    }
 
     /**
     * Create user
diff --git a/samples/client/petstore/kotlin-retrofit2/src/main/kotlin/org/openapitools/client/infrastructure/ApiClient.kt b/samples/client/petstore/kotlin-retrofit2/src/main/kotlin/org/openapitools/client/infrastructure/ApiClient.kt
index b539fda7438d..2b657de46adb 100644
--- a/samples/client/petstore/kotlin-retrofit2/src/main/kotlin/org/openapitools/client/infrastructure/ApiClient.kt
+++ b/samples/client/petstore/kotlin-retrofit2/src/main/kotlin/org/openapitools/client/infrastructure/ApiClient.kt
@@ -6,9 +6,16 @@ import retrofit2.converter.scalars.ScalarsConverterFactory
 import retrofit2.converter.moshi.MoshiConverterFactory
 
 class ApiClient(
-    private var baseUrl: String = "http://petstore.swagger.io/v2",
+    private var baseUrl: String = defaultBasePath,
     private var okHttpClient: OkHttpClient
 ) {
+    companion object {
+        @JvmStatic
+        val defaultBasePath: String by lazy {
+            System.getProperties().getProperty("org.openapitools.client.baseUrl", "http://petstore.swagger.io/v2")
+        }
+    }
+
     init {
         normalizeBaseUrl()
     }
diff --git a/samples/client/petstore/kotlin-string/src/main/kotlin/org/openapitools/client/apis/PetApi.kt b/samples/client/petstore/kotlin-string/src/main/kotlin/org/openapitools/client/apis/PetApi.kt
index 93269dced25d..926e3497f7bd 100644
--- a/samples/client/petstore/kotlin-string/src/main/kotlin/org/openapitools/client/apis/PetApi.kt
+++ b/samples/client/petstore/kotlin-string/src/main/kotlin/org/openapitools/client/apis/PetApi.kt
@@ -26,7 +26,13 @@ import org.openapitools.client.infrastructure.ResponseType
 import org.openapitools.client.infrastructure.Success
 import org.openapitools.client.infrastructure.toMultiValue
 
-class PetApi(basePath: kotlin.String = "http://petstore.swagger.io/v2") : ApiClient(basePath) {
+class PetApi(basePath: kotlin.String = defaultBasePath) : ApiClient(basePath) {
+    companion object {
+        @JvmStatic
+        val defaultBasePath: String by lazy {
+            System.getProperties().getProperty("org.openapitools.client.baseUrl", "http://petstore.swagger.io/v2")
+        }
+    }
 
     /**
     * Add a new pet to the store
diff --git a/samples/client/petstore/kotlin-string/src/main/kotlin/org/openapitools/client/apis/StoreApi.kt b/samples/client/petstore/kotlin-string/src/main/kotlin/org/openapitools/client/apis/StoreApi.kt
index 1399a0ca1cf7..08822c67e32a 100644
--- a/samples/client/petstore/kotlin-string/src/main/kotlin/org/openapitools/client/apis/StoreApi.kt
+++ b/samples/client/petstore/kotlin-string/src/main/kotlin/org/openapitools/client/apis/StoreApi.kt
@@ -25,7 +25,13 @@ import org.openapitools.client.infrastructure.ResponseType
 import org.openapitools.client.infrastructure.Success
 import org.openapitools.client.infrastructure.toMultiValue
 
-class StoreApi(basePath: kotlin.String = "http://petstore.swagger.io/v2") : ApiClient(basePath) {
+class StoreApi(basePath: kotlin.String = defaultBasePath) : ApiClient(basePath) {
+    companion object {
+        @JvmStatic
+        val defaultBasePath: String by lazy {
+            System.getProperties().getProperty("org.openapitools.client.baseUrl", "http://petstore.swagger.io/v2")
+        }
+    }
 
     /**
     * Delete purchase order by ID
diff --git a/samples/client/petstore/kotlin-string/src/main/kotlin/org/openapitools/client/apis/UserApi.kt b/samples/client/petstore/kotlin-string/src/main/kotlin/org/openapitools/client/apis/UserApi.kt
index a7d99762fd8c..1e6e81fc1e91 100644
--- a/samples/client/petstore/kotlin-string/src/main/kotlin/org/openapitools/client/apis/UserApi.kt
+++ b/samples/client/petstore/kotlin-string/src/main/kotlin/org/openapitools/client/apis/UserApi.kt
@@ -25,7 +25,13 @@ import org.openapitools.client.infrastructure.ResponseType
 import org.openapitools.client.infrastructure.Success
 import org.openapitools.client.infrastructure.toMultiValue
 
-class UserApi(basePath: kotlin.String = "http://petstore.swagger.io/v2") : ApiClient(basePath) {
+class UserApi(basePath: kotlin.String = defaultBasePath) : ApiClient(basePath) {
+    companion object {
+        @JvmStatic
+        val defaultBasePath: String by lazy {
+            System.getProperties().getProperty("org.openapitools.client.baseUrl", "http://petstore.swagger.io/v2")
+        }
+    }
 
     /**
     * Create user
diff --git a/samples/client/petstore/kotlin-threetenbp/src/main/kotlin/org/openapitools/client/apis/PetApi.kt b/samples/client/petstore/kotlin-threetenbp/src/main/kotlin/org/openapitools/client/apis/PetApi.kt
index a2698dc47ea0..e1f24025fedd 100644
--- a/samples/client/petstore/kotlin-threetenbp/src/main/kotlin/org/openapitools/client/apis/PetApi.kt
+++ b/samples/client/petstore/kotlin-threetenbp/src/main/kotlin/org/openapitools/client/apis/PetApi.kt
@@ -26,7 +26,13 @@ import org.openapitools.client.infrastructure.ResponseType
 import org.openapitools.client.infrastructure.Success
 import org.openapitools.client.infrastructure.toMultiValue
 
-class PetApi(basePath: kotlin.String = "http://petstore.swagger.io/v2") : ApiClient(basePath) {
+class PetApi(basePath: kotlin.String = defaultBasePath) : ApiClient(basePath) {
+    companion object {
+        @JvmStatic
+        val defaultBasePath: String by lazy {
+            System.getProperties().getProperty("org.openapitools.client.baseUrl", "http://petstore.swagger.io/v2")
+        }
+    }
 
     /**
     * Add a new pet to the store
diff --git a/samples/client/petstore/kotlin-threetenbp/src/main/kotlin/org/openapitools/client/apis/StoreApi.kt b/samples/client/petstore/kotlin-threetenbp/src/main/kotlin/org/openapitools/client/apis/StoreApi.kt
index 1399a0ca1cf7..08822c67e32a 100644
--- a/samples/client/petstore/kotlin-threetenbp/src/main/kotlin/org/openapitools/client/apis/StoreApi.kt
+++ b/samples/client/petstore/kotlin-threetenbp/src/main/kotlin/org/openapitools/client/apis/StoreApi.kt
@@ -25,7 +25,13 @@ import org.openapitools.client.infrastructure.ResponseType
 import org.openapitools.client.infrastructure.Success
 import org.openapitools.client.infrastructure.toMultiValue
 
-class StoreApi(basePath: kotlin.String = "http://petstore.swagger.io/v2") : ApiClient(basePath) {
+class StoreApi(basePath: kotlin.String = defaultBasePath) : ApiClient(basePath) {
+    companion object {
+        @JvmStatic
+        val defaultBasePath: String by lazy {
+            System.getProperties().getProperty("org.openapitools.client.baseUrl", "http://petstore.swagger.io/v2")
+        }
+    }
 
     /**
     * Delete purchase order by ID
diff --git a/samples/client/petstore/kotlin-threetenbp/src/main/kotlin/org/openapitools/client/apis/UserApi.kt b/samples/client/petstore/kotlin-threetenbp/src/main/kotlin/org/openapitools/client/apis/UserApi.kt
index a7d99762fd8c..1e6e81fc1e91 100644
--- a/samples/client/petstore/kotlin-threetenbp/src/main/kotlin/org/openapitools/client/apis/UserApi.kt
+++ b/samples/client/petstore/kotlin-threetenbp/src/main/kotlin/org/openapitools/client/apis/UserApi.kt
@@ -25,7 +25,13 @@ import org.openapitools.client.infrastructure.ResponseType
 import org.openapitools.client.infrastructure.Success
 import org.openapitools.client.infrastructure.toMultiValue
 
-class UserApi(basePath: kotlin.String = "http://petstore.swagger.io/v2") : ApiClient(basePath) {
+class UserApi(basePath: kotlin.String = defaultBasePath) : ApiClient(basePath) {
+    companion object {
+        @JvmStatic
+        val defaultBasePath: String by lazy {
+            System.getProperties().getProperty("org.openapitools.client.baseUrl", "http://petstore.swagger.io/v2")
+        }
+    }
 
     /**
     * Create user
diff --git a/samples/client/petstore/kotlin/src/main/kotlin/org/openapitools/client/apis/PetApi.kt b/samples/client/petstore/kotlin/src/main/kotlin/org/openapitools/client/apis/PetApi.kt
index a2698dc47ea0..e1f24025fedd 100644
--- a/samples/client/petstore/kotlin/src/main/kotlin/org/openapitools/client/apis/PetApi.kt
+++ b/samples/client/petstore/kotlin/src/main/kotlin/org/openapitools/client/apis/PetApi.kt
@@ -26,7 +26,13 @@ import org.openapitools.client.infrastructure.ResponseType
 import org.openapitools.client.infrastructure.Success
 import org.openapitools.client.infrastructure.toMultiValue
 
-class PetApi(basePath: kotlin.String = "http://petstore.swagger.io/v2") : ApiClient(basePath) {
+class PetApi(basePath: kotlin.String = defaultBasePath) : ApiClient(basePath) {
+    companion object {
+        @JvmStatic
+        val defaultBasePath: String by lazy {
+            System.getProperties().getProperty("org.openapitools.client.baseUrl", "http://petstore.swagger.io/v2")
+        }
+    }
 
     /**
     * Add a new pet to the store
diff --git a/samples/client/petstore/kotlin/src/main/kotlin/org/openapitools/client/apis/StoreApi.kt b/samples/client/petstore/kotlin/src/main/kotlin/org/openapitools/client/apis/StoreApi.kt
index 1399a0ca1cf7..08822c67e32a 100644
--- a/samples/client/petstore/kotlin/src/main/kotlin/org/openapitools/client/apis/StoreApi.kt
+++ b/samples/client/petstore/kotlin/src/main/kotlin/org/openapitools/client/apis/StoreApi.kt
@@ -25,7 +25,13 @@ import org.openapitools.client.infrastructure.ResponseType
 import org.openapitools.client.infrastructure.Success
 import org.openapitools.client.infrastructure.toMultiValue
 
-class StoreApi(basePath: kotlin.String = "http://petstore.swagger.io/v2") : ApiClient(basePath) {
+class StoreApi(basePath: kotlin.String = defaultBasePath) : ApiClient(basePath) {
+    companion object {
+        @JvmStatic
+        val defaultBasePath: String by lazy {
+            System.getProperties().getProperty("org.openapitools.client.baseUrl", "http://petstore.swagger.io/v2")
+        }
+    }
 
     /**
     * Delete purchase order by ID
diff --git a/samples/client/petstore/kotlin/src/main/kotlin/org/openapitools/client/apis/UserApi.kt b/samples/client/petstore/kotlin/src/main/kotlin/org/openapitools/client/apis/UserApi.kt
index a7d99762fd8c..1e6e81fc1e91 100644
--- a/samples/client/petstore/kotlin/src/main/kotlin/org/openapitools/client/apis/UserApi.kt
+++ b/samples/client/petstore/kotlin/src/main/kotlin/org/openapitools/client/apis/UserApi.kt
@@ -25,7 +25,13 @@ import org.openapitools.client.infrastructure.ResponseType
 import org.openapitools.client.infrastructure.Success
 import org.openapitools.client.infrastructure.toMultiValue
 
-class UserApi(basePath: kotlin.String = "http://petstore.swagger.io/v2") : ApiClient(basePath) {
+class UserApi(basePath: kotlin.String = defaultBasePath) : ApiClient(basePath) {
+    companion object {
+        @JvmStatic
+        val defaultBasePath: String by lazy {
+            System.getProperties().getProperty("org.openapitools.client.baseUrl", "http://petstore.swagger.io/v2")
+        }
+    }
 
     /**
     * Create user