Accidentally submitted to predatory journal, did not pay fee, already online? I am a first time researcher and naively submitted to an OA predatory journal (on BEALL'S LIST) which requests a publishing fee. Having read the terms and conditions, there was no comment stating that I needed to pay if accepted for publication and did state that i retained copyrights to my work. My work was accepted and they requested the publication fee but I have now found that my work is already on their website without the fee being paid or me signing anything. Is there anyway to retract my work without being penalised?
IANAL

It totally depends on your jurisdiction.
However, as pointed out by Solar Mike, they made an "invitatio ad offerendum" (like at the bakery, where they invite you to make an offer (i.e. want to buy) a bread or similar).
By submitting, you declared to make an offer and they accepted it and published it.
So they fulfilled their part of the contract and your part (payment) is still open.

You can still try to retract your paper by sending an email to the editor and maybe it's worth a gamble to not pay. Your institution should be able to help you with this question