For future reference, I believe I already made the first trade some days ago:

--- SNIP ---
This contract is for the exchange of 200 ZCoin (XZC) at a
rate of 0.0012 BTC per XZC, for a total of 0.24 BTC.

abrkn (btt 68569) agrees to send 0.24 BTC (plus any fees necessary) to
1Ck4ZNnpaCFnBGbbWhD4RFxo5iFTajjFyP

johndoe (btt 222284) agrees to send 200 XZC (plus any fees necessary) to the
ZCoin address aB8BhaB3syNJB6SCiKtmZ7SRtBLKnHdfjQ

abrkn will send the Bitcoin first and johndoe will send within 24h after
the Bitcoin transaction has at least one confirmation.
--- SNIP ---