Caixa Guissona API Access & Open Banking Data Sync

Caixa Guissona is a Catalan cooperative bank, and with open-banking.io you can bring its accounts into one place without wrestling with eIDAS certificates or PSD2 sandboxes. open-banking.io covers 2,600+ EU and UK banks and hands you a single, encrypted view of your balances and transactions. Because it is zero-knowledge, your data is decrypted only on your own device with a key that never leaves it — the service never sees your account contents.

Caixa Guissona (BIC CAXIES21) supports both business and personal accounts through open-banking.io, and a single consent stays valid for up to 180 days before you need to reauthorise.

How to connect Caixa Guissona

Connecting happens entirely in 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 generated locally on your device.
  2. In the dashboard, search for and select Caixa Guissona, then choose whether you're linking a business or personal account.
  3. You're redirected to Caixa Guissona's own secure login, where you approve the PSD2 access request directly with the bank.
  4. Once approved, your accounts sync back into your open-banking.io dashboard and refresh automatically.

That's the whole flow — you authenticate with Caixa Guissona, not with a third party handling your credentials.

Access your data

If you're a developer, reading the data programmatically is an optional step after the connection above is live. From the Developers page, create an API key and export a credentials.json — this bundles the API key together with your private decryption key. You can then use the CLI (openbanking accounts, openbanking transactions, openbanking sync), an SDK, or the REST API. Requests carry your key in the X-Api-Key header, and every response is decrypted locally with your private key. Note there is no connect command — the CLI and SDK only read and sync connections you already made in the dashboard. An API key alone returns ciphertext; without your private key it stays unreadable.

All of this runs for around EUR 3/month, with no certificate paperwork.

FAQ

Do I need a PSD2 certificate to connect Caixa Guissona?

No. open-banking.io is certificate-free — you approve access on Caixa Guissona's own login screen and nothing more.

Can open-banking.io read my Caixa Guissona transactions?

No. The service is zero-knowledge and holds only your public key; your data is decrypted solely on your device.

Up to 180 days, after which you reauthorise from the dashboard.

Ready to start? Visit open-banking.io.