For what it is worth - the link worked without header too. As to the question - currently there is no option for user-defined headers but it will be added soon. BTW: Javascript in AmiQuote is used only to process response(s), not to send requests.
Thanks Tomasz - their doco said it needed an API key so I didn't even try without one!
Binance requires the start/end time to be in unix epoch format (e.g. 1633795783 for now). Are you able to add new variables for {from_epoch} and {to_epoch}? That'd open up a heap of other doors.
I'm sure we'd all be happy to share any data sources we build so they can be added to future releases.