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Fix transferable formula #5956

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merged 2 commits into from
Aug 19, 2024
Merged

Fix transferable formula #5956

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991927c
Fix transferable formula
TarikGul Aug 19, 2024
16439fc
nits
TarikGul Aug 19, 2024
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11 changes: 8 additions & 3 deletions packages/api-derive/src/balances/all.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -57,9 +57,14 @@ function calcShared (api: DeriveApi, bestNumber: BlockNumber, data: DeriveBalanc
let transferable = null;

if (data.frameSystemAccountInfo?.frozen) {
const frozenReserveDiff = data.frameSystemAccountInfo.frozen.sub(data.reservedBalance);

transferable = api.registry.createType('Balance', allLocked ? 0 : data?.freeBalance.sub(bnMax(frozenReserveDiff, api.consts.balances.existentialDeposit)));
const { frameSystemAccountInfo, freeBalance, reservedBalance } = data;

transferable = api.registry.createType(
'Balance',
allLocked
? 0
: freeBalance.sub(bnMax(new BN(0), frameSystemAccountInfo.frozen.sub(reservedBalance)))
);
}

return objectSpread({}, data, {
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2 changes: 1 addition & 1 deletion packages/api-derive/src/balances/types.ts
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Expand Up @@ -41,7 +41,7 @@ export interface DeriveBalancesAllAccountData extends DeriveBalancesAccountData
*/
lockedBreakdown: (PalletBalancesBalanceLock | BalanceLockTo212)[];
/**
* Calculated transferable balance. This uses the formula: free - max(frozen - reserve, ed)
* Calculated transferable balance. This uses the formula: free - max(0, frozen - reserve)
* This is only correct when the return type of `api.query.system.account` is `FrameSystemAccountInfo`.
* Which is the most up to date calulcation for transferrable balances.
*
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