The US is set to withdraw from the Universal Postal Union (UPU) agreement, which currently allows Chinese sellers to ship products to the US at a lower rate than domestic sellers. This change is expected to level the playing field for US sellers, particularly on platforms like eBay. The withdrawal is scheduled to take effect on October 17, and will require Chinese sellers to pay the same domestic rates as US sellers for shipping. This move is seen as a response to the perceived unfair trade practices that have benefited Chinese sellers.