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correct deposit liquidity ratio #505 #513

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correct deposit liquidity ratio #505 #513

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cac4c6d
fix: correct deposit liquidity ratio calculation
MrBlackGhostt Jan 19, 2026
7b974e6
fix: implement optimal amount calculation for deposits
MrBlackGhostt Jan 19, 2026
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31 changes: 15 additions & 16 deletions tokens/token-swap/anchor/programs/token-swap/src/instructions/deposit_liquidity.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -38,24 +38,23 @@ pub fn deposit_liquidity(
(amount_a, amount_b)
} else {
let ratio = I64F64::from_num(pool_a.amount)
.checked_mul(I64F64::from_num(pool_b.amount))
.checked_div(I64F64::from_num(pool_b.amount))
.unwrap();
if pool_a.amount > pool_b.amount {
(
I64F64::from_num(amount_b)
.checked_mul(ratio)
.unwrap()
.to_num::<u64>(),
amount_b,
)

// Calculate the optimal amount of A needed for the given amount of B
let optimal_amount_a = I64F64::from_num(amount_b)
.checked_mul(ratio)
.unwrap()
.to_num::<u64>();

if optimal_amount_a <= amount_a {
(optimal_amount_a, amount_b)
} else {
(
amount_a,
I64F64::from_num(amount_a)
.checked_div(ratio)
.unwrap()
.to_num::<u64>(),
)
let optimal_amount_b = I64F64::from_num(amount_a)
.checked_div(ratio)
.unwrap()
.to_num::<u64>();
(amount_a, optimal_amount_b)
}
};

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2 changes: 1 addition & 1 deletion tokens/token-swap/anchor/programs/token-swap/src/lib.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -6,7 +6,7 @@ mod instructions;
mod state;

// Set the correct key here
declare_id!("AsGVFxWqEn8icRBFQApxJe68x3r9zvfSbmiEzYFATGYn");
declare_id!("Bb8CYNtpoqQUR4t2JaoMH8uwVCmjBWiVbBVqeXBcSM93");

#[program]
pub mod swap_example {
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