Sorry guys, my copypasta mistake.

Exchange rate JSON key for Bitstamp is not "lowest_ask" - but just "ask", same as the field 1 key. So:

Bitstamp
exchange URL: https://www.bitstamp.net/api/ticker/
exhange rate JSON key: ask
field 1 JSON key: ask
field 2 JSON key: last
field 3 JSON key: bid

I've wanted to release a new version for weeks now but as I'm in crunch mode with a big project somehow just can't find the time to actually do it.