Nagelmackers API Access & Open Banking Data Sync

Nagelmackers is Belgium's oldest bank, and open-banking.io lets you reach its account and transaction data without wrestling with PSD2 certificates or eIDAS onboarding. Whether you hold a business or personal account (BIC BNAGBEBB), you connect once through our dashboard and your balances and transactions flow into a single, private view. Everything is decrypted on your own device with a key that never leaves it — so nobody, not even us, can read your Nagelmackers data.

How to connect Nagelmackers

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 open the dashboard.
2. Set an encryption passphrase. Your cryptographic keys are generated locally on your device; we only ever hold your public key.
3. Pick Nagelmackers from the bank list and choose your account type (business or personal).
4. You are redirected to Nagelmackers's own secure login to approve access on the bank's consent screen (standard PSD2 authorisation).
5. Once approved, your accounts sync into your dashboard automatically. Consent lasts up to 180 days, after which you simply re-approve.

Access your data

After your Nagelmackers connection is live, developers can optionally read it programmatically. From the Developers page, create an API key and export a credentials.json — this bundles your API key plus your private decryption key. Then use the CLI (openbanking accounts, openbanking transactions, openbanking sync), an SDK, or the REST API. Requests authenticate with the X-Api-Key header, and every response is decrypted locally with your own key. An API key alone only ever returns ciphertext — without your private key, the data stays unreadable.

The CLI and SDKs only read and sync connections you already made in the dashboard; there is no connect command.

Pricing & privacy

For about EUR 3/month you get certificate-free access to 2,600+ EU/UK banks. The architecture is zero-knowledge: our servers store only your public key, so your financial data can be decrypted by you alone.

Do I need a PSD2 certificate to use Nagelmackers?

No. open-banking.io handles the regulated connection, so you never obtain or manage eIDAS certificates yourself.

Can I connect both business and personal Nagelmackers accounts?

Yes. Nagelmackers supports both account types — connect each one from the dashboard.

How long does my Nagelmackers consent last?

Up to 180 days per PSD2 rules. The dashboard prompts you to renew before it expires.

Ready to start? Visit open-banking.io.