You put the disclaimer at the end so I won't critcize but what you're giving is bad advice. I quote from the Zillow API Terms of Use... ======================

You put the disclaimer at the end so I won't critcize but what you're giving is bad advice. I quote from the Zillow API Terms of Use... ================================================ Acceptable Use. You agree not to use the Zillow API, Zillow Data, or Zillow Brand & Links in any way that is unlawful, or harms Zillow.com, its service providers, its suppliers, your end users, or any other person. Further, pursuant to Section 10 below, Zillow.com may terminate your use of the Zillow API, Zillow Data and Zillow Brand & Links if and when Zillow.com determines that your use is inappropriate. ================================================ So there is something they can do. Blocking API calls is painfully easy and they've outlined their right to ban anyone they consider to be doing harm to them (which a competitor would clearly qualify as). To Auston: I do agree that $250 is a really low bid and you might want to engage in a little friendly negotiation but in doing so realize they don't have to give you anything. So when choosing a tactic I'd avoid the hard negotiation and instead try to "charm" more money out of them.