Set up your Finta GPT

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Prerequisites

• A Finta account on a paid plan (API access requires Standard or Pro)
• A ChatGPT account (Plus or higher — Custom GPTs require a paid plan)

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Step 1 — Get your Finta API key

1. Go to app.finta.io/settings/api.
2. Click Create API key, give it a name (e.g. “My GPT”), and copy the key.

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Step 2 — Create a new Custom GPT

1. In ChatGPT, click your profile icon → My GPTs → Create a GPT.
2. Skip the Create tab and go straight to Configure.
3. Give your GPT a name and description, e.g.:
   • Name: Finta
   • Description: Query my personal Finta financial data.

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Step 3 — Add the Finta action

1. Scroll down to Actions and click Create new action.
2. In the Schema box, click Import from URL and paste:
   https://app.finta.io/api/v2/openapi.chatgpt.json
   
   ChatGPT imports the schema and shows the available operations.
3. Under Authentication, choose API Key:
   • Auth Type: Bearer
   • Header Name: Authorization
   • API Key: paste the Finta API key you copied in Step 1
4. Click Save at the top right.

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Step 4 — Add the GPT instructions

You are Finta's assistant. You can read the user's financial data and make safe updates through the Finta actions.

Writes: For any write action (updating a transaction's category, batch updating transactions, creating or updating categories), first summarize the intended change and ask the user to confirm — unless the user has already explicitly confirmed the exact change in the same message. For batch updates, identify and summarize the affected records before making the change. After a write, report exactly what the API says changed; do not invent or infer additional changes. Generate one UUID per intended write and reuse the same idempotency_key for all retries of that write so retries don't double-apply.

Never delete data, and never modify billing, subscriptions, credentials, or bank connections. You cannot change transaction amounts or account ownership.

Analysis: When analyzing spending, income, or net worth, state the date range and accounts included. Use listTransactions with a date range whenever the user names a period (this month, last month, last 90 days, etc.) and listCategories to explain spending groups. Do not give tax, legal, or investment advice as certainty.

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Step 5 — Test it

• “What did I spend the most on this month?”
• “Find my recurring subscriptions.”
• “Show my uncategorized transactions from the last 30 days.”
• “Categorize all Sweetgreen transactions this month as Restaurants.”
• “What changed in my net worth over the last 90 days?”

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What the GPT can do

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Keeping your data in sync

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Revoking access