Thank you for your testing. TokenJar can only trade ERC20 tokens. The MetaMask wallet is needed, because TokenJar is built upon 0x protocol. We hope we can implement BTC pairs in the long run.
I received the following error:
502 Bad Gateway
nginx/1.10.3 (Ubuntu)
after a few retries, I managed to access the site but It's now asking for MetaMask. What is going to happen If you ever implement BTC pairs? since there is no services like MetaMask for bitcoin to interact with.