Panda Pool

Abstract base contract implementing bonding curve mechanics.

Functions

Trading

buyTokens

function buyTokens(
    uint256 amountIn,
    uint256 minAmountOut,
    address to
) external nonReentrant returns (uint256 amountOut, uint256 fee)

Purchase tokens with the base token.

Parameters:

  • amountIn: Amount of base tokens to spend

  • minAmountOut: Minimum tokens to receive

  • to: Recipient address

Returns:

  • amountOut: Amount of tokens received

  • fee: Fee paid in base tokens

Errors:

  • PandaPool: INSUFFICIENT_OUTPUT_AMOUNT - When amountOut is less than minAmountOut

  • PandaPool: TRADE_BELOW_MIN - When trade size is below minimum threshold

  • PandaPool: INVALID_TO - When recipient address is zero

  • PandaPool: GRADUATED - When pool has already graduated

buyTokensWithBera

function buyTokensWithBera(
    uint256 minAmountOut,
    address to
) external payable returns (uint256 amountOut, uint256 fee)

Purchase tokens using native BERA.

Parameters:

  • minAmountOut: Minimum tokens to receive

  • to: Recipient address

Returns:

  • amountOut: Amount of tokens received

  • fee: Fee paid in BERA

Errors:

  • PandaPool: NOT_BERA_PAIR - When base token is not WBERA

  • PandaPool: INSUFFICIENT_OUTPUT_AMOUNT - When amountOut is less than minAmountOut

  • PandaPool: INVALID_TO - When recipient address is zero

  • PandaPool: GRADUATED - When pool has already graduated

buyAllTokens

function buyAllTokens(
    address to
) external returns (uint256 amountOut, uint256 fee)

Purchase all remaining tokens in the pool.

Parameters:

  • to: Recipient address

Returns:

  • amountOut: Amount of tokens received

  • fee: Fee paid in base tokens

Errors:

  • PandaPool: INVALID_TO - When recipient address is zero

  • PandaPool: INSUFFICIENT_LIQUIDITY - When not enough liquidity for trade

  • PandaPool: GRADUATED - When pool has already graduated

sellTokens

function sellTokens(
    uint256 amountIn,
    uint256 minAmountOut,
    address to
) external nonReentrant returns (uint256 amountOut, uint256 fee)

Sell tokens for the base token.

Parameters:

  • amountIn: Amount of tokens to sell

  • minAmountOut: Minimum base tokens to receive

  • to: Recipient address

Returns:

  • amountOut: Amount of base tokens received

  • fee: Fee paid in base tokens

Errors:

  • PandaPool: INSUFFICIENT_BUYING - When selling more than bought

  • PandaPool: INSUFFICIENT_OUTPUT_AMOUNT - When amountOut is less than minAmountOut

  • PandaPool: INVALID_TO - When recipient address is zero

  • PandaPool: GRADUATED - When pool has already graduated

sellTokensForBera

function sellTokensForBera(
    uint256 amountIn,
    uint256 minAmountOut,
    address to
) external returns (uint256 amountOut, uint256 fee)

Sell tokens for native BERA.

Parameters:

  • amountIn: Amount of tokens to sell

  • minAmountOut: Minimum amount of BERA to receive

  • to: Recipient address for BERA

Returns:

  • amountOut: Amount of BERA received

  • fee: Fee paid in BERA

Errors:

  • PandaPool: NOT_BERA_PAIR - When base token is not WBERA

  • PandaPool: INSUFFICIENT_BUYING - When selling more than bought

  • PandaPool: INSUFFICIENT_OUTPUT_AMOUNT - When amountOut is less than minAmountOut

  • PandaPool: INVALID_TO - When recipient address is zero

Price Discovery Functions

getAmountOutBuy

function getAmountOutBuy(
    uint256 amountIn
) public view returns (
    uint256 amountOut,
    uint256 fee,
    uint256 sqrtP_new
)

Calculate expected output for buying tokens.

Returns:

  • amountOut: Expected amount of tokens to receive

  • fee: Expected fee in base tokens

  • sqrtP_new: New square root price after the trade

Errors:

  • PandaPool: TRADE_BELOW_MIN - When trade size is below minimum threshold

  • PandaPool: INSUFFICIENT_LIQUIDITY - When not enough liquidity for trade

  • PandaPool: GRADUATED - When pool has already graduated

getAmountOutSell

function getAmountOutSell(
    uint256 amountIn
) public view returns (
    uint256 amountOut,
    uint256 fee,
    uint256 sqrtP_new
)

Calculate expected output for selling tokens.

Parameters:

  • amountIn: Amount of tokens to sell

Returns:

  • amountOut: Expected amount of base tokens to receive

  • fee: Expected fee in base tokens

  • sqrtP_new: New square root price after the trade

Errors:

  • PandaPool: TRADE_BELOW_MIN - When trade size is below minimum threshold

  • PandaPool: INSUFFICIENT_LIQUIDITY - When not enough liquidity for trade

  • PandaPool: GRADUATED - When pool has already graduated

getAmountInBuy

function getAmountInBuy(
    uint256 amountOut
) public view returns (
    uint256 amountIn,
    uint256 fee,
    uint256 sqrtP_new
)

Calculate required input for desired token output.

Parameters:

  • amountOut: Desired amount of tokens to receive

Returns:

  • amountIn: Required amount of base tokens to spend

  • fee: Expected fee in base tokens

  • sqrtP_new: New square root price after the trade

Errors:

  • PandaPool: TRADE_BELOW_MIN - When trade size is below minimum threshold

  • PandaPool: INSUFFICIENT_LIQUIDITY - When not enough tokens available

  • PandaPool: GRADUATED - When pool has already graduated

getAmountInBuyRemainingTokens

getAmountInBuyRemainingTokens() 
public view returns (uint256 amountIn)

Calculate amount needed to buy all remaining tokens.

Returns:

  • amountIn: Amount of base tokens needed to buy all remaining tokens

Balance & Vesting Functions

totalBalanceOf

totalBalanceOf(
    address user
) external view returns (uint256)

Get total balance including unvested tokens.

Parameters:

  • user: Address to check balance for

Returns:

  • Total balance including both vested and unvested tokens

vestedBalanceOf

 vestedBalanceOf(
    address user
) external view returns (uint256)

Get available/vested balance.

Parameters:

  • user: Address to check vested balance for

Returns:

  • Currently vested token balance

claimableTokens

claimableTokens(
    address user
) public view returns (uint256)

Get amount of tokens available to claim.

Parameters:

  • user: Address to check claimable tokens for

Returns:

  • Amount of tokens currently available to claim

Errors:

  • PandaPool: VESTING_OFF - When vesting is not enabled

  • PandaPool: NOT_GRADUATED - When pool hasn't graduated yet

claimTokens

claimTokens(
    address user
) external returns (uint256)

Claim vested tokens.

Parameters:

  • user: Address to claim tokens for

Returns:

  • Amount of tokens claimed

Errors:

  • PandaPool: VESTING_OFF - When vesting is not enabled

  • PandaPool: NO_CLAIMABLE - When no tokens are available to claim

Pool State Functions

remainingTokensInPool

remainingTokensInPool()
public view returns (uint256)

Get remaining tokens available in pool.

Returns:

  • Amount of tokens remaining in the pool

viewExcessTokens

viewExcessTokens()
public view returns (
    uint256 excessPandaTokens,
    uint256 excessBaseTokens
)

View excess tokens in contract.

Returns:

  • excessPandaTokens: Amount of excess Panda tokens

  • excessBaseTokens: Amount of excess base tokens

collectExcessTokens

collectExcessTokens()
external

Transfer excess tokens to treasury.

Emits: ExcessCollected

Events

PoolInitialized(
    address pandaToken,
    address baseToken,
    uint256 sqrtPa,
    uint256 sqrtPb,
    uint256 vestingPeriod,
    address deployer,
    bytes data
)

Emitted when pool is initialized.

Swap(
    address indexed sender,
    uint amount0In,
    uint amount1In,
    uint amount0Out,
    uint amount1Out,
    address indexed to
)

Emitted on each swap operation.

Sync(
    uint256 pandaReserve,
    uint256 baseReserve,
    uint256 sqrtPrice
)

Emitted when pool reserves are synchronized.

TokensClaimed(
    address indexed user,
    uint256 amount
)

Emitted when tokens are claimed from vesting.

ExcessCollected(
    uint256 excessPandaTokens,
    uint256 excessBaseTokens
)

Emitted when excess tokens are collected.

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