Check this out: https://www.openbazaar.org/blog/openbazaar-bitcoin-fees/

Developers: Help get your favorite coin added to OpenBazaar!

If you’re a developer, particularly if you’re knowledgeable with cryptocurrencies, you can help us integrate these new coins.

If you’re not a developer, but you want another cryptocurrency integrated into OpenBazaar, try to get some community support to urge the coin’s developer community to contribute. 

Either way, please join us on Reddit https://reddit.com/r/openbazaar

or 

https://docs.google.com/forms/d/e/1FAIpQLSdEXqnREdncZYEXYSaE_wK41UV6JkBqNxqY5X-6J3oFNlZ72Q/viewform to be invited to join us on Slack to contribute to the discussion!