AI CONNECTORS · MCP

Use Monthly in ChatGPT

Monthly is now an app in ChatGPT, built on an open MCP server. Add it, authorize with your Monthly account and ask how your month is going, add expenses, manage goals and undo mistakes, in plain language.

Use Monthly in ChatGPTOpen Monthly
  • 37 tools
  • Authorize with your account
  • Undo for every change

What is this?

Your assistant, with your real numbers

MCP (Model Context Protocol) is an open standard that lets an AI assistant use tools from another app. Monthly publishes a server at the address below and ChatGPT connects to it through the Monthly app: once you authorize it, the assistant can read your months, categories, goals and commitments, and make changes on your behalf. Monthly still does not connect to banks or move money: the AI only sees and edits what you recorded in Monthly.

Server URL (MCP, Streamable HTTP)
https://app.monthly.com.ar/api/mcp

Ask

Read your month, compare periods, forecast month end and spot recurring charges.

Act

Add or fix expenses, income, fixed payments, goals, investments and debts owed to you.

Undo

Every change gets a receipt, and the last change made through a connection can be reverted.

How it works

Three steps, no technical setup

01

Open Monthly in ChatGPT

Tap the button on this page, or go to Settings → Connect with AI inside Monthly and tap ChatGPT.

02

Authorize

Sign in with your Monthly account, review what ChatGPT can do and tap Authorize. You never copy a key.

03

Ask

Start a chat with Monthly and say: “how is my month going?”.

Where it works

Available in ChatGPT

ChatGPT is the first assistant with an official Monthly app. The guide has the steps, a quick check and troubleshooting. Other assistants will be listed here when they are ready.

ChatGPT

ChatGPT app with OAuth1 minute

Official app in the ChatGPT directory: add it and authorize with your Monthly account, no keys.

What you can ask

Examples by what you want to get done

Click a prompt to copy it, then paste it in ChatGPT. The assistant picks the right tool; you just say what you need.

Understand your month

Add and fix

Goals and saving

Plan ahead

Tidy up

What the 37 tools cover

  • Read (14). Overview, months, entries, category breakdown, goals, trends, comparisons, insights, month-end forecast, upcoming commitments, global search, CSV export, recurring templates.
  • Write (22). Expenses, income, fixed payments, weekend expenses, goals and contributions, months, investments, debts owed to you, recurring templates and bulk loading of up to 50 expenses.
  • Undo (1). undo_last_change reverts the last change made through that connection.

Visual widgets

Not just text: charts and cards inside the chat

Where the assistant supports them, answers come with interactive cards built in Monthly's style. Otherwise you still get a clear text answer with the same data.

Month overview

Income, fixed, daily spending, available, category donut, goals and upcoming payments.

Trends

Income versus spending across months, with the savings rate.

Month vs month

Per-category differences between two months.

By category

Donut and list with each category's amount and share.

Entries

Filterable list with a delete button and undo.

Goals

Progress, installments and projection for each goal.

Commitments

What is due and when: fixed expenses, installments and goals.

Change receipt

What changed after every write, with an Undo button.

Insights

Spending spikes, recurring charges and the month-end forecast.

Illustrations are simplified; real widgets use your data and your client's theme.

Security and privacy

You decide what is connected, and you can undo it

Sign in with your account

You authorize with your Monthly account through OAuth. Your password is never shared with ChatGPT and there is no key to copy or leak.

Revoke any time

Settings → Connect with AI lists your connections. Disconnect removes one and its access stops working.

Undo

Each write returns a receipt with an undo id, and undo_last_change reverts the last change made through that connection.

Audit trail

Changes go through the same command path as the app, with revision checks, an idempotency key and an audit record.

Your data, your provider

What the assistant reads is processed by the AI provider you chose, under its terms. Read our privacy policy to see how this fits.

Limits

Requests are rate-limited, and only your own data is ever returned.

Read the privacy policy

Troubleshooting

If something does not work

I cannot see the Monthly app in ChatGPT
App availability depends on your plan and region. Open the “Use Monthly in ChatGPT” button on this page: ChatGPT tells you whether you can use it.
I tapped Authorize and nothing happened
Check that your browser did not block the Monthly window and try again. Sign in with the same Monthly account you use in the app.
Monthly says the account is not linked
Sign in to Monthly once with the same account you authorize with, then retry.
ChatGPT asks me to sign in again
Normal after disconnecting. Connect the app again and approve access in the Monthly window.
It added something to the wrong month
With no hint, writes go to the current month based on Argentina's date. If you want another month, say it in your request, for example “in August”.
The AI asked which of two expenses with the same name
That is expected: if a name is ambiguous, Monthly returns the options instead of guessing. Answer with the date or the amount.
I hit the request limit
There is a rate limit for reads and writes. Wait a minute and retry; for large loads ask it to use bulk loading.
Changes do not show up in the app
Reload Monthly. If the change is not there, ask the AI to list the month's entries to confirm it was applied.
It loaded something wrong
Ask “undo the last thing you added”. If more changes happened since, fix that entry from Monthly or with a new instruction.

FAQ

Frequently asked questions

What is Monthly's AI connector?
It is a ChatGPT app built on an MCP (Model Context Protocol) server that Monthly publishes at https://app.monthly.com.ar/api/mcp. Once you authorize it, ChatGPT can read your budget and make changes on your behalf using 37 tools: check your month, add expenses, manage goals and undo the last change.
Which assistants work today?
Today it works with ChatGPT, through Monthly's official app in the ChatGPT app directory. Other assistants are not available yet.
How do I add Monthly to ChatGPT?
Open Monthly's page in the ChatGPT app directory (the “Use Monthly in ChatGPT” button on this page, or Settings → Connect with AI inside Monthly), connect the app and sign in with your Monthly account to authorize. You never copy a key.
Does it cost anything?
Monthly does not charge extra to connect an AI. ChatGPT may have its own plan, limits and costs, and app availability depends on your plan and region.
Can the AI delete or change my data?
It can, because the tools include adding, editing and deleting entries, goals, investments and debts. That is why every change returns a receipt, ChatGPT usually asks for your approval before using a tool, and the last change made through the connection can be reverted with undo_last_change. We recommend asking for a confirmation before big loads.
How is my account protected?
You authorize with your Monthly account through OAuth. ChatGPT never receives your password and there is no key to copy. You can revoke access any time.
How do I disconnect ChatGPT?
Go to Settings → Connect with AI in Monthly and tap Disconnect on the connection you want. Its access stops working.
What data does the assistant see?
It sees what the tools return when it asks: months, entries, categories, goals, investments and debts recorded in Monthly. The AI provider processes it under its own terms. Monthly does not connect to your bank. More in the privacy policy.
Do I need to know how to code?
No. You open the Monthly app in ChatGPT, authorize with your account and talk in plain language.
What is MCP?
Model Context Protocol is an open standard for AI assistants to use tools and data from other apps in a uniform way. Think of it as a universal connector.

Keep reading

Also see

Ready to try it?

Add Monthly in ChatGPT and sign in with your Monthly account. It takes about a minute.

Use Monthly in ChatGPTOpen Monthly

ChatGPT and OpenAI are trademarks of their respective owners, used only to indicate compatibility. No affiliation or endorsement is implied. AI answers can contain mistakes: check the numbers before you decide. This is not financial advice.