Looks like blockr's get unspent API limit the number of addresses to 20 per request. It's not documented. I've emailed their support for the exact number and other affected endpoints.
I tested the API with 52 addresses & 50 transactions. This issue shouldn't be a problem for release. I'll close it as soon as I get a confirmation from blockr
Looks like blockr's get unspent API limit the number of addresses to 20 per request. It's not documented. I've emailed their support for the exact number and other affected endpoints.