🐞 [Bug]: 3.2.2 No XCM delivery fees configured for sibling parachain messages

[KitHat]

What happened?

To ensure fairness among users and prevent spamming of messages across chains, an adequate fee mechanism must be implemented for sending the XCM message.

Currently, there are no fees charged for delivering XCM messages across parachains. In the template runtime configuration, this is configured through PriceForSiblingDelivery by NoPriceForMessageDelivery.

Attackers may send spam messages across chains without paying a fee. Excessive messages could lead to XCM queue size exhaustion by excessive storage usage until messages are delivered. This could also lead to delays in message delivery for other users.

platform

• linux
• windows
• macos

Expected behavior

Charge adequate message delivery fees in the runtime configuration template. To prevent excessive delivery times and storage exhaustion, an exponential fee mechanism should be used as configured in Kusama

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