Unrequested autotrade on OX

Hi C2ers,

This morning OX processed a BTO for 4 shares of DTV followed 4 minutes later by a STC for those same shares. It cost me $20 in commissions. OX said that the trade was via the "API" and C2 is the only service that I have that uses the API. I did sign up for Topaz a few days ago and they did put a sizable DTV position up yesterday.

How and why did this even happen?

regards, bert