For Germany there is HBCI (now FinTS), which is relatively old. Its not really web oriented, but rather used by banking Software like Quicken.<p><a href="https:&#x2F;&#x2F;en.m.wikipedia.org&#x2F;wiki&#x2F;FinTS" rel="nofollow">https:&#x2F;&#x2F;en.m.wikipedia.org&#x2F;wiki&#x2F;FinTS</a>