BondingCurve - KasFun Docs

Contract Info

Property	Value
Address	Read from `MemeFactory.bondingCurve()` (see Addresses for MemeFactory address)
Network	Kasplex (see Addresses for chain details)

All calculation functions are pure — they don’t read or modify state. You can call them off-chain for gas-free price quotes.

Functions

calculateBuyReturnWithParams

Calculate how many tokens you get for a given KAS amount.

function calculateBuyReturnWithParams(
    uint256 kasIn,
    uint256 tokenReserves,
    uint256 kasReserves,
    uint256 vToken,
    uint256 vKas
) external pure returns (uint256 tokensOut)

Parameter	Type	Description
`kasIn`	uint256	KAS amount to spend (wei)
`tokenReserves`	uint256	Current token reserves from `getTokenInfo()`
`kasReserves`	uint256	Current KAS reserves from `getTokenInfo()`
`vToken`	uint256	Virtual token from `getTokenParamVersion()`
`vKas`	uint256	Virtual KAS from `getTokenParamVersion()`

calculateSellReturnWithParams

Calculate how much KAS you get for selling tokens.

function calculateSellReturnWithParams(
    uint256 tokensIn,
    uint256 tokenReserves,
    uint256 kasReserves,
    uint256 vToken,
    uint256 vKas
) external pure returns (uint256 kasOut)

Parameter	Type	Description
`tokensIn`	uint256	Token amount to sell (wei)
`tokenReserves`	uint256	Current token reserves from `getTokenInfo()`
`kasReserves`	uint256	Current KAS reserves from `getTokenInfo()`
`vToken`	uint256	Virtual token from `getTokenParamVersion()`
`vKas`	uint256	Virtual KAS from `getTokenParamVersion()`

calculateBuyCostWithParams

Calculate how much KAS you need to get a desired amount of tokens.

function calculateBuyCostWithParams(
    uint256 tokensOut,
    uint256 tokenReserves,
    uint256 kasReserves,
    uint256 vToken,
    uint256 vKas
) external pure returns (uint256 kasIn)

Parameter	Type	Description
`tokensOut`	uint256	Desired token amount (wei)
`tokenReserves`	uint256	Current token reserves from `getTokenInfo()`
`kasReserves`	uint256	Current KAS reserves from `getTokenInfo()`
`vToken`	uint256	Virtual token from `getTokenParamVersion()`
`vKas`	uint256	Virtual KAS from `getTokenParamVersion()`

getCurrentPrice

Get the current spot price.

function getCurrentPrice(
    uint256 tokenReserves,
    uint256 kasReserves
) external view returns (uint256 price)

virtualToken / virtualKas

function virtualToken() external view returns (uint256)
function virtualKas() external view returns (uint256)

Default virtual reserves configured in the BondingCurve contract. Note: individual tokens may use different values via getTokenParamVersion().

curveType

function curveType() external view returns (uint256)

Returns the curve type identifier.

Full ABI (JSON)

BondingCurve ABI JSON

[
  {
    "inputs": [{"internalType": "uint256", "name": "kasIn", "type": "uint256"}, {"internalType": "uint256", "name": "tokenReserves", "type": "uint256"}, {"internalType": "uint256", "name": "kasReserves", "type": "uint256"}, {"internalType": "uint256", "name": "vToken", "type": "uint256"}, {"internalType": "uint256", "name": "vKas", "type": "uint256"}],
    "name": "calculateBuyReturnWithParams",
    "outputs": [{"internalType": "uint256", "name": "tokensOut", "type": "uint256"}],
    "stateMutability": "pure",
    "type": "function"
  },
  {
    "inputs": [{"internalType": "uint256", "name": "tokensOut", "type": "uint256"}, {"internalType": "uint256", "name": "tokenReserves", "type": "uint256"}, {"internalType": "uint256", "name": "kasReserves", "type": "uint256"}, {"internalType": "uint256", "name": "vToken", "type": "uint256"}, {"internalType": "uint256", "name": "vKas", "type": "uint256"}],
    "name": "calculateBuyCostWithParams",
    "outputs": [{"internalType": "uint256", "name": "kasIn", "type": "uint256"}],
    "stateMutability": "pure",
    "type": "function"
  },
  {
    "inputs": [{"internalType": "uint256", "name": "tokensIn", "type": "uint256"}, {"internalType": "uint256", "name": "tokenReserves", "type": "uint256"}, {"internalType": "uint256", "name": "kasReserves", "type": "uint256"}, {"internalType": "uint256", "name": "vToken", "type": "uint256"}, {"internalType": "uint256", "name": "vKas", "type": "uint256"}],
    "name": "calculateSellReturnWithParams",
    "outputs": [{"internalType": "uint256", "name": "kasOut", "type": "uint256"}],
    "stateMutability": "pure",
    "type": "function"
  },
  {
    "inputs": [{"internalType": "uint256", "name": "tokenReserves", "type": "uint256"}, {"internalType": "uint256", "name": "kasReserves", "type": "uint256"}],
    "name": "getCurrentPrice",
    "outputs": [{"internalType": "uint256", "name": "price", "type": "uint256"}],
    "stateMutability": "view",
    "type": "function"
  },
  {
    "inputs": [],
    "name": "virtualToken",
    "outputs": [{"internalType": "uint256", "name": "", "type": "uint256"}],
    "stateMutability": "view",
    "type": "function"
  },
  {
    "inputs": [],
    "name": "virtualKas",
    "outputs": [{"internalType": "uint256", "name": "", "type": "uint256"}],
    "stateMutability": "view",
    "type": "function"
  },
  {
    "inputs": [],
    "name": "curveType",
    "outputs": [{"internalType": "uint256", "name": "", "type": "uint256"}],
    "stateMutability": "view",
    "type": "function"
  }
]

​Contract Info

​Functions

​calculateBuyReturnWithParams

​calculateSellReturnWithParams

​calculateBuyCostWithParams

​getCurrentPrice

​virtualToken / virtualKas

​curveType

​Full ABI (JSON)

Contract Info

Functions

calculateBuyReturnWithParams

calculateSellReturnWithParams

calculateBuyCostWithParams

getCurrentPrice

virtualToken / virtualKas

curveType

Full ABI (JSON)