diff --git a/README.md b/README.md
index a38e8a5c..ea46ad09 100644
--- a/README.md
+++ b/README.md
@@ -639,6 +639,16 @@ interface RestfulReactConfig {
     customProps?: {
       base?: string;
     };
+    customGenerator?: (data: {
+    componentName: string;
+    verb: string;
+    route: string;
+    description: string;
+    genericsTypes: string;
+    operation: OperationObject;
+    paramsInPath: string[];
+    paramsTypes: string;
+  }) => string;
   };
 }
 ```
@@ -676,6 +686,16 @@ module.exports = {
 }
 ```
 
+##### Custom generator
+
+To support even more advanced usecases (like a promise base API, mock generator or anything else that can infer from your specs), you can define your own template in `customGenerator`. This function will be call for each route with some useful computed values (see the types above) and the resulted string will be added to the generated file.
+
+You can see a concrete usage inside the `examples` folder and try yourself in this repository with the following command:
+- `yarn build`
+- `yarn example:advanced petstore-custom-fetch`
+
+You can inspect the result inside `/examples/petstoreFromFileSpecWithCustomFetch.tsx`
+
 ## Contributing
 
 All contributions are welcome – especially:
diff --git a/examples/fetchers.ts b/examples/fetchers.ts
new file mode 100644
index 00000000..1253e7c9
--- /dev/null
+++ b/examples/fetchers.ts
@@ -0,0 +1,76 @@
+import qs from "qs";
+
+export interface CustomGetProps<
+  _TData = any,
+  _TError = any,
+  TQueryParams = {
+    [key: string]: any;
+  }
+> {
+  queryParams?: TQueryParams;
+}
+
+export const customGet = <
+  TData = any,
+  TError = any,
+  TQueryParams = {
+    [key: string]: any;
+  }
+>(
+  path: string,
+  props: { queryParams?: TQueryParams },
+  signal?: RequestInit["signal"],
+): Promise<TData | TError> => {
+  let url = path;
+  if (props.queryParams && Object.keys(props.queryParams).length) {
+    url += `?${qs.stringify(props.queryParams)}`;
+  }
+  return fetch(url, {
+    headers: {
+      "content-type": "application/json",
+    },
+    signal,
+  }).then(res => res.json());
+};
+
+export interface CustomMutateProps<
+  _TData = any,
+  _TError = any,
+  TQueryParams = {
+    [key: string]: any;
+  },
+  TRequestBody = any
+> {
+  body: TRequestBody;
+  queryParams?: TQueryParams;
+}
+
+export const customMutate = <
+  TData = any,
+  TError = any,
+  TQueryParams = {
+    [key: string]: any;
+  },
+  TRequestBody = any
+>(
+  method: string,
+  path: string,
+  props: { body: TRequestBody; queryParams?: TQueryParams },
+  signal?: RequestInit["signal"],
+): Promise<TData | TError> => {
+  let url = path;
+  if (method === "DELETE" && typeof props.body === "string") {
+    url += `/${props.body}`;
+  }
+  if (props.queryParams && Object.keys(props.queryParams).length) {
+    url += `?${qs.stringify(props.queryParams)}`;
+  }
+  return fetch(url, {
+    method,
+    body: JSON.stringify(props.body),
+    headers: {
+      "content-type": "application/json",
+    },
+    signal,
+  }).then(res => res.json());
+};
diff --git a/examples/restful-react.config.js b/examples/restful-react.config.js
index 0b20ff9a..9c39a126 100644
--- a/examples/restful-react.config.js
+++ b/examples/restful-react.config.js
@@ -2,6 +2,8 @@
  * Example config for `yarn example:advanced`
  */
 
+const { camel } = require("case");
+
 module.exports = {
   "petstore-file": {
     file: "examples/petstore.yaml",
@@ -15,4 +17,25 @@ module.exports = {
       base: `"http://my-pet-store.com"`,
     },
   },
+  "petstore-custom-fetch": {
+    file: "examples/petstore.yaml",
+    output: "examples/petstoreFromFileSpecWithCustomFetch.tsx",
+    customImport: `import { customGet, customMutate, CustomGetProps, CustomMutateProps } from "./fetchers"`,
+    customGenerator: ({ componentName, verb, route, description, genericsTypes, paramsInPath, paramsTypes }) => {
+      const propsType = type =>
+        `Custom${type}Props<${genericsTypes}>${paramsInPath.length ? ` & {${paramsTypes}}` : ""}`;
+
+      return verb === "get"
+        ? `${description}export const ${camel(componentName)} = (${
+            paramsInPath.length ? `{${paramsInPath.join(", ")}, ...props}` : "props"
+          }: ${propsType(
+            "Get",
+          )}, signal?: RequestInit["signal"]) => customGet<${genericsTypes}>(\`http://petstore.swagger.io/v1${route}\`, props, signal);\n\n`
+        : `${description}export const ${camel(componentName)} = (${
+            paramsInPath.length ? `{${paramsInPath.join(", ")}, ...props}` : "props"
+          }: ${propsType(
+            "Mutate",
+          )}, signal?: RequestInit["signal"]) => customMutate<${genericsTypes}>("${verb.toUpperCase()}", \`http://petstore.swagger.io/v1${route}\`, props, signal);\n\n`;
+    },
+  },
 };