ExpTokenBasedFormula

Git Source

This contract provides functions for calculating the purchase and sale return values on an exponential token-based curve using a scaling factor. The formula converts a desired token amount into a reserve token cost and the sale of a token amount into a reserve token return.

State Variables

MAX_SCALE

Max reserve ratio in basis points

uint32 private constant MAX_SCALE = 1000000;

WAD

Wei as decimal precision for calculations

uint256 private constant WAD = 10 ** 18;

Functions

_calculateExpTokenBasedPurchaseCost

Returns the purchase cost for a given conversion (in the reserve token) for a desired amount (in the main token).

function _calculateExpTokenBasedPurchaseCost(uint256 supply, uint256 initialCost, uint32 scalingFactor, uint256 amount)
    internal
    pure
    returns (uint256 purchaseCost);

Parameters

Name	Type	Description
supply	uint256	token total supply
initialCost	uint256	initial cost of the token
scalingFactor	uint32	scaling factor, represented in basis points, 1-10000
amount	uint256	amount of tokens to purchase

Returns

Name	Type	Description
purchaseCost	uint256	cost of the conversion

_calculateExpTokenBasedSaleReturn

Returns the sale value for a given amount (in the main token) as a conversion into the reserve token.

function _calculateExpTokenBasedSaleReturn(uint256 supply, uint256 initialCost, uint32 scalingFactor, uint256 amount)
    internal
    pure
    returns (uint256 saleReturn);

Parameters

Name	Type	Description
supply	uint256	token total supply
initialCost	uint256	initial cost of the token
scalingFactor	uint32	scaling factor, represented in basis points, 1-10000
amount	uint256	amount of tokens to sell

Returns

Name	Type	Description
saleReturn	uint256	return of the conversion

Errors

ExpTokenBasedFormula__InvalidInput

error ExpTokenBasedFormula__InvalidInput();