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If it's your house and you haven't accepted any offers you can do whatever you please.
You are asking a legal question which should be answered by an attorney.
Also, If you think of the situation differently, you may see some logic to it.
For example, what if the price was test the market and see if the suggested price was useful.
Once activity and interest could be "measured", and there was not written agreement between a buyer and the seller, the price could be adjusted - either way.
Would you have the same question if the seller decided to lower the price after an open house?
Just food for thought.
I would contact a local real estate professional to help with you to save time and money.
(I'm on the Cape, but I can help you choose a local pro if you want help doing so.)
(Please note: when you choose an answer as a Best Answer, or at least give a thumbs up, it helps those who answer questions here.)
Depending on their contract with the listing agent they may have a financial obligation to them.