Grong Sparebank API Access & Open Banking Data

Grong Sparebank, the Eika-alliance savings bank rooted in Trøndelag, keeps your balances and transaction history behind its own secure login. open-banking.io gives you a standards-based way to reach that data yourself — covering both business and personal accounts — without chasing an eIDAS certificate or running your own PSD2 licence. It sits alongside 2,600+ European banks, so Grong Sparebank becomes one entry in a single, consistent dashboard.

The defining trait is privacy. open-banking.io is zero-knowledge: your encryption keys are generated on your own device from a passphrase only you know, and every record is decrypted locally. The servers hold your public key alone and never see readable data. It is also certificate-free, so there is nothing to buy from a QTSP before you begin.

How to connect Grong Sparebank

Connecting happens entirely inside the open-banking.io dashboard — there is no API call, code, or key involved in this step.

  1. Sign up for open-banking.io and set your encryption passphrase; your keys are created locally at that moment.
  2. In the dashboard, search for Grong Sparebank and choose the account type you want to link — business or personal.
  3. You are redirected to Grong Sparebank's own secure login, where you approve access under PSD2 consent, valid for up to 180 days before you renew it.
  4. Your approved accounts sync back into the dashboard, ready to view.

Because Grong Sparebank has no assigned BIC in this directory (BIC: n/a), you identify it by name in the dashboard rather than by code.

Access your data

Reading data programmatically is an optional step you take after connecting. On the Developers page, create an API key and export a credentials.json — it bundles the API key together with your private decryption key. From there use the CLI (openbanking accounts, openbanking transactions, openbanking sync), an SDK, or the REST API. Every request sends the X-Api-Key header, and each response is decrypted locally with your own key. An API key by itself only ever returns ciphertext, which is what keeps the model zero-knowledge.

All of this runs at roughly EUR 3/month.

Do I need a certificate to access Grong Sparebank?

No. open-banking.io is certificate-free — a passphrase and dashboard sign-up are all you need.

Can I read both business and personal accounts?

Yes. Both account types are supported; pick the one you want when linking Grong Sparebank.

Up to 180 days per approval, after which you re-confirm access on Grong Sparebank's login screen.

Start at open-banking.io.