# FAQs

1. Can I use joinstr on mainnet right now?\
   \
   Yes.<br>
2. Can I use joinstr without bitcoin core?\
   \
   Yes. It can be used as an electrum plugin which does not require bitcoin core. Although it is advised to use your EPS for better privacy instead of default electrum servers.<br>
3. Can I use joinstr on mobile?\
   \
   Yes. Android and iOS.<br>
4. What fees do I need to pay for using joinstr?\
   \
   a) Transaction fees which is contributed by all the participants\
   b) Nostr relay fee if using a paid relay\
   \
   Read more about [market making on joinstr](https://uncensoredtech.substack.com/p/market-makers-in-joinstr) to earn fees from pools.<br>
5. What pool denominations are supported in joinstr coinjoin rounds?\
   \
   Users can configure it and create pools based on custom denominations.&#x20;