Maarten Deen has commented on the following diary entries

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The Java XAPI about 8 years ago

Looks promising. But the performance with large bboxes isn't there yet.
Harry Wood's example works for me, I can also download banks in a 0.2x0.2 bbox, but trying to get banks for the whole of the Netherlands does not work yet. I get a "504 Gateway Time-out" message.
My test URL:*[amenity=bank][bbox=2.5,50.7,7.2,53.6]