What happen if I won an item and seller send me bid cancellation after listing end and I accept?

[marnotom!]

Then the seller is relieved of his responsibility to ship the item to you and the sale is cancelled.

Have you paid for the item yet?

[pjcdn2005]

If you accept the transaction is cancelled and the seller gets their ebay fees back.

If you have already paid then do not accept the cancellation until you have been refunded.

Did the seller explain why they wanted to cancel?

[jaspr-ca2014]

Is there any negative effect on buyer's account?

[pierrelebel]

No.