Skip to main content

Monetizing a ChatGPT plugin using Nevermined

OpenAI created the ChatGPT plugins as an extension that allow users to interact with external services. OpenAI ChatGPT provides intelligent answers to users based on the internal data crawled by OpenAI from internet until moment in time (2022) when the model was trained. OpenAI is not connected to internet and therefore it cannot provide answers to questions that are not in the internal data.

As an answer to that OpenAI created the ChatGPT plugins, that allow users to connect to external services and get answers from them. The ChatGPT plugins are a way to extend the capabilities of the OpenAI ChatGPT model.

Since them several organizations have created their own ChatGPT plugins, and they are available in the OpenAI marketplace.

In this tutorial we are gonna describe how to publish your OpenAI ChatGPT plugin in Nevermined, so you can monetize it and share it with a broader group of users.

Create your own ChatGPT plugin


If you already created your plugin you can skip this section

OpenAI created the ChatGPT Plugin Retrieval software template to facilitate the creation of ChatGPT plugins. It provides the scafolding to integrate into the ChatGPT marketplace. This software template is available on Github so you can copy/fork that code and implement your stuff on top of that.

There are multiple options when you create your plugin, like the vector database to use, but here we are gonna focus and what needs to be done to integrate your plugin with ChatGPT.

After you find the right Vector Database and implement the logic it's important you pay attention to the .well-known folder:

  1. Edit the .well-known/ai-plugin.json file. It should contain the information about your plugin, like the name, description, version, etc.
  2. In the auth section you need to configure the authentication mechanism that validates the requests via a bearer token. See the below example for more details.
  3. Overwrite with your logo the .well-known/logo.png file
  4. Add your contact email and link to your website

Example of the .well-known/ai-plugin.json file completed:

"schema_version": "v1",
"name_for_model": "retrieval",
"name_for_human": "Elvis Songs Summarizer",
"description_for_model": "Plugin for summarizing Elvis songs. Giving an Elvis title song, it summarizes the lyrics of that song.",
"description_for_human": "Summarizes Elvis songs giving the title.",
"auth": {
"type": "user_http",
"authorization_type": "bearer"
"api": {
"type": "openapi",
"url": "",
"has_user_authentication": false
"logo_url": "",
"contact_email": "",
"legal_info_url": ""

Edit the .well-known/openapi.yaml file. It should contain the information about your API. It's very important each endpoint included here has good documentation that helps ChatGPT to identify if the method exposed can be useful depending on the user query. So if your method analyze the sentiment of a text, you should include in the documentation the keywords that ChatGPT can use to identify your plugin as the right one to analyze the sentiment given a user query.

Extract example of the .well-known/openapi.yaml file completed:

openapi: 3.0.2
title: Elvis Songs Summarizer
description: Plugin for summarizing Elvis songs. Giving an Elvis title song, it summarizes the lyrics of that song
version: 0.0.6
- url:
summary: Query
description: Accepts the title of a Elvis song as a search query objects array each with query and optional filter. Break down complex questions into sub-questions. Refine results by criteria, e.g. time / source, don't do this often. Split queries if ResponseTooLargeError occurs.
operationId: query_query_post


summary: Summarize
description: Given an Elvis song title it summarizes the lyrics of that song. Break down complex questions into sub-questions. Refine results by criteria, e.g. time / source, don't do this often. Split queries if ResponseTooLargeError occurs.
operationId: ask_query_post


You can find a complete example in the Nevermined Elvis ChatGPT plugin

At this point you should have your plugin ready to be deployed using your favorite cloud/on-premise solution.

Register your ChatGPT plugin in Nevermined

So at this point you should you have implemented your plugin and deploy it somewhere. Now you can share your plugin with the other ChatGPT users in a safety way, and even monetize it if you want, using a Nevermined Smart Subscription.

In order to test and learn how you can use Nevermined App, we provide a testing environment where you can try the different features provided by Nevermined.

You can access to this test version of Nevermined App here

Before you register your Service

We recommend you to take a look to the different guides and tutorials we have about Nevermined App

The next step is to create a brand new Smart Subscription

You will register your AI Service associated with this Subscription you are about to create. The process to create a new Subscription is pretty straightforward, but here you can find some help to guide you.

Registering your AI Service

So now that you have all set up and you have created a Smart Subscription, you can create a Web Service Asset to register your AI Service in Nevermined App.

You can find a complete guide to register your service here

Plugin Service Registration

Defining Endpoints URLs

In the second step of the process you'll see you need to provide the endpoints URLs of your ChatGPT Plugin Service, and in case you have protected them with a Bearer Token, you need to facilitate it.

Instead of define the endpoints one by one manually, we can use the OpenAPI integration to do this automatically.

So in the OpenAPI URL field you need to provide the URL of the openapi.json file describing your API. If you used the ChatGPT Template plugin this should be generated automatically and exposed in the root of your service. In the example we are using the Elvis ChatGPT plugin, the URL is

Plugin Endpoints

Once this is done, all the endpoints included as part of the definition will be registered automatically in the Protected Endpoints section. Go through them and remove the ones you don't want to expose. For example we don't want to allow anyone to update/upsert/delete any document through the API, so we remove those endpoints clicking on the cross at right of each endpoint.

Now this step is important, the ChatGPT plugins require to have full read access to the .well-known folder, so we need to add the following endpoint to the Open Endpoints section:


The final (.*) part is a wildcard that will allow the ChatGPT plugin to access to any file included in the .well-known folder. Use your own domain instead of YOUR_SERVICE. For example using the previous Elvis ChatGPT plugin example, the URL will be*)

Add some metadata and associate the Smart Subscription

In the next 2 screens you just need to include some additional metadata that facilitates the integration by a third-party. And finally we just need to associate the Smart Subscription you created before. If you select any non-free Smart Subscription, the users who want to use your plugin will need to pay for it.

When you finish the process you will see your new Web Service Asset registered in the Nevermined App.

Plugin Details Page

Now if you go to the Integration Details tab of the service you will see the Proxy URL and the JWT token. The JWT token is only available to you or the users who have access to the Smart Subscription associated with the service. This token is used to authenticate the requests to the protected endpoints.

Remember them because you are gonna need it when you integrate your plugin in OpenAI.

How to integrate details

Copy the Proxy URL and paste it in all the references of the .well-known/openapi.yaml, .well-known/ai-plugin.json or server/ files of your plugin. This is the URL that ChatGPT will use to access to your plugin and it's better not expose any public url on it.

Redeploy your plugin once this is done.

Integrating your ChatGPT plugin in OpenAI

Now our plugin is registered in Nevermined, we can integrate it in ChatGPT OpenAI:

  1. Go to the OpenAI ChatGPT page and click on GPT-4 > Plugins linkthe Add Plugin button.
  2. Click on Plugins Store
  3. Click on Develop your own plugin
  4. Paste the domain of your plugin using the Proxy URL we copied before: How to integrate details
  5. OpenAI will fetch the ai-plugin.json file and validate it. If everything is ok you will see the Install button enabled. Click on it.
  6. The application will ask you to introduce the Authentication Token. Paste here the JWT token copied before. How to integrate details
  7. Click on Install and the plugin will be ready to use

Using your ChatGPT plugin

Now in the ChatGPT interface, when you click on GPT-4 > Plugins you will see your plugin available. Click on it and you will see the plugin enabled.

Using the ChatGPT plugin

So if everything is ok, you can start using your plugin. In the ChatGPT input field introce a query that is related with your plugin, if ChatGPT identify your query as something your plugin can resolve ti will send a query to it (remember we said the description of your API was important).

ChatGPT will send a query to your plugin through the Nevermined Proxy and will use the JWT token provided. Without that JWT token the request wouldn't go through. Your plugin will return the response to ChatGPT and it will show it to you.