June 27, 2026 · 5 min read
By John · Founder & product
Connect Nethaven MCP to Claude, ChatGPT, or Cursor
Connect Claude, ChatGPT, or Cursor to Nethaven via MCP and ask questions about your money by chat. OAuth login, no API keys, no data exports. Here is how it works and why it is safe.
Your money lives in Nethaven, and you want to ask questions about it in a chat. The old way was exporting a CSV, pasting it into an assistant, and hoping nothing sensitive leaked. The new way is one URL and a normal sign-in — after that you can ask Claude, ChatGPT, or Cursor about your real, live finances.
What you can ask
Once connected, the assistant reads your live Nethaven data — not a snapshot or an export — so the answers reflect your accounts right now:
- “What’s my net worth right now?”
- “How much did I spend on dining last month?”
- “Which subscriptions have gone up in price?”
- “Log a $42 dinner at Nobu.”
- “Set my grocery budget to $600.”
What it cannot do
This is the part that matters most for a financial app, so it is worth being blunt. The assistant cannot:
- Delete any data
- Link or unlink bank accounts
- Move money
- Make bulk changes
- Access anything outside your own account
Every write action — adding a transaction, changing a category — shows a confirmation step in the assistant before Nethaven does anything. You approve each one individually. And you can revoke access any time from Settings → Connect AI assistant, which cuts the connection instantly because nothing was ever copied out.
What happens when you connect
There is no API key, no script, and no terminal. The assistant signs in as you, just like a mobile app would:
- You paste one URL into your assistant’s settings.
- A login window opens — it is your normal Nethaven sign-in.
- You approve the connection.
- The assistant can now answer financial questions using your real data.
How to connect
- Open your assistant’s connectors or MCP settings.
- Choose “Add custom connector” or “Add MCP server”.
- Paste:
https://api.nethaven.app/mcp - Sign in to Nethaven when prompted.
- Approve individual tool calls before the assistant makes changes.
Where to find the setting in each client:
- Claude: Settings → Connectors → Add custom connector.
- ChatGPT: Settings → Connectors → Add custom connector (where available on your plan).
- Cursor: Settings → MCP → Add new MCP server.
For the full step-by-step with screenshots, see the Connect AI assistant guide or the MCP feature overview.
What requires Pro
The AI assistant connection requires an active Nethaven Pro subscription. See pricing for details.
Track this automatically in Nethaven so accounts, budgets, debt, goals, and subscriptions stay connected between reviews.
Frequently asked questions
Is my financial data sent to the AI company?
Only the answer to what you ask passes through the assistant. When you ask 'What did I spend on dining last month?', the assistant requests that figure from Nethaven and shows it to you. Your full account, like a CSV export, is never uploaded or stored by the AI company.
What if I revoke access — does the AI still have my data?
No. The connection is a live sign-in, not a copy. When you revoke access in Settings → Connect AI assistant, the assistant can no longer read anything new. There is no exported file sitting on its servers because none was ever created.
Which AI assistants are supported?
Any assistant that supports custom connectors or MCP servers, including Claude, ChatGPT, and Cursor. You paste the same Nethaven URL into each one's connector settings and sign in.
Can the assistant make changes without asking me?
No. Every change — adding a transaction, setting a budget — shows a confirmation step in the assistant before Nethaven does anything, and you approve each one individually. The assistant cannot delete data, move money, link bank accounts, or make bulk changes at all.
Do I need a developer account or API key?
No. There is no API key, script, or terminal. You paste one URL and sign in to Nethaven the same way you do in the app. An active Nethaven Pro subscription is required.