Fix on Android for delivery fee:
A message sending chain now can deduct delivery fee. In recent Kusama upgrade exponential delivery fee is introduced calculated using formula:
F * (B + encoded_msg_len * M)
where F is a factor that depends on the queue load: dmp.deliveryFactor, xcmpQueue.deliveryFactor
pgolovkin
commented
3 weeks ago
Fix on Android for delivery fee: A message sending chain now can deduct delivery fee. In recent Kusama upgrade exponential delivery fee is introduced calculated using formula:
F * (B + encoded_msg_len * M)where F is a factor that depends on the queue load: dmp.deliveryFactor, xcmpQueue.deliveryFactor
B - base fee constant in xcm config: https://github.com/polkadot-fellows/runtimes/blob/v1.1.0/relay/kusama/src/xcm_config.rs#L116C12-L116C27
M - TransactionByteFee constant in the config: https://github.com/polkadot-fellows/runtimes/blob/v1.1.0/relay/kusama/src/lib.rs#L414
For example, if one is sending KSM: Kusama ➝ Asset Hub. It will now pay:
fee for teleport extrinsic on Kusama delivery fee on Kusama (by xcm pallet) xcm execution fee on Asset Hub
Note that xcm-pallet widthraws fee not from the holding but from the sender's balance before sending message to the destination chain.
Android fix PR https://github.com/novasamatech/nova-wallet-android/pull/1411/files
Should be done after ED validation implementation.