The queue service and topic mode of Tencent Cloud CMQ are free for use. If you access CMQ service via public network, the inbound traffic is free, while the outbound traffic is charged. For more information about traffic price, please see "Charge for traffic consumption" in https://intl.cloud.tencent.com/document/product/215/3079. If you access the CMQ service via private network, both inbound and outbound traffic are free of charge. We recommend that you access the CMQ service via private network.