Depletion - Is there MAI available to borrow for a specific vault type? A vault is considered depleted if there is less than 0.05% of MAI available to borrow in relation to the value of assets deposited in the vaults. Example: if $1,000,000 worth of ETH is deposited in vaults, a MAI available to borrow balance of 500 MAI or below would be considered depleted.