Sorry for answering in English because we're not offering technical support with other languages. First, we're giving a trial credit as $0.01 for newcomer. In Pay-Per-Traffic, you can use Mudfish Items as a nodes' maximum capable speed at that time. Without extra-pay but weighted. It's flexible how long will going your credits. The Pay-Per-Traffic plan consumes 2 times as based capacity of a node's up and download traffic. Subscription is just credit-fixed for 1 month but speed limited as 1 Mbps except for first 3 seconds. You have to buy a credit at least $2.99. It's common in PPT and Subscription Plan. https://mudfish.net/docs/en/policy/pricing.html