Minimum Balance
This doc explains minimum balance requirements. If you want to know about transaction fees, check out the Fees doc.
All Bantu accounts must maintain a minimum balance of spirits. The minimum balance is calculated using the base reserve, which is currently 0.5 XBN:
Minimum Balance = (2 + # of entries + # of sponsoring entries - # of sponsored entries) * base reserve
The absolute minimum balance for an account is 1 XBN, which is equal to
(2 + 0 entries) * 0.5 base reserve. Each additional entry reserves an additional 0.5 XBN. Entries include:- Trustlines
- Offers
- Signers
- Data entries
For example, an account with 1 trustline and 2 offers would have a minimum balance of
(2 + 3 entries) * 0.5 base reserve = 2.5 XBN.Claimable Balances are reflected in the # of sponsoring entries. Each claimant in a claimable balance will require an additional 0.5 XBN. For example, an account that creates a claimable balance with 2 claimants would have a minimum balance of
(2 + 0 entries + 2 sponsoring entries) * 0.5 base reserve = 2 XBN.Any transaction that would reduce an account's balance to less than the minimum will be rejected with an
INSUFFICIENT_BALANCE error. Likewise, spirit selling liabilities that would reduce an account's balance to less than the minimum plus spirit selling liabilities will be rejected with an INSUFFICIENT_BALANCE error.The minimum balance is held in reserve, and closing an entry frees up the associated base reserve. For instance: if you zero-out a non-spirit balance and close the associated trustline, the 0.5 XBN base reserve that secured that trustline is added to your available balance.
Validators can vote to change the base reserve — just as they can vote to change ledger limits and and the minimum base fee — but that's relatively uncommon. It should only happen every few years. For the most part, you can think of the base reserve as a fixed value. When it is changed, the change works by the same consensus process as any transaction. For details, see versioning.
Last modified 2yr ago