Open Banking Without an eIDAS Certificate: A Practical Developer's Guide (2026)

Short summary

This guide explains how developers can access EU bank data via PSD2 open banking APIs without purchasing expensive eIDAS certificates by using AIS aggregators that hold the certificates on your behalf. It compares the direct eIDAS path (EUR 2k-10k/year, weeks of setup) with the aggregator path (free tiers, minutes to first call, thousands of banks) and walks through the consent flow, GDPR considerations, and when each approach is best. The author is the founder of open-banking.io, one such aggregator.

• •AIS aggregators let developers access EU bank APIs without buying eIDAS certificates, reducing setup from weeks to minutes
• •Direct eIDAS access costs EUR 2k-10k/year and suits regulated fintechs; aggregator path suits indie devs and SMBs
• •GDPR tradeoff: aggregators add a data intermediary, so verify EU data residency and end-to-end encryption before choosing

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