But 15 USD is considered undervalue?
Yes and it is very possible because this time altcoins is beginning a bull and INJ is already trading at $13 +
The statistics also is good with growing volume, check

The team is active. This team ran bounty on this forum last year though reward was in etheruem and later USDT. It is a promising project because delivery of bounty reward is good sign that team is committed to grow a project and not scam exit. The publications a programs of such project may also be fulfilled.
Disclaimer: This is not a business advise, just my opinion.