Pricing Modules

Pricing Modules are utility contracts that implement the IPricingModule interface and are used by the BiPoolManager during swaps to price the swaps. A pricing module has to implement two functions:

uint256 amountOut = pricingModule.getAmountOut(inBucket, outBucket, spread, amountIn);
uint256 amountIn = pricingModule.getAmountIn(inBucket, outBucket, spread, amountOut);

https://github.com/mento-protocol/mento-core/blob/main/contracts/interfaces/IPricingModule.sol

IPricingModule.sol

ConstantSumPricingModule

$$X * p + Y = K \newline (X +x)*p + Y-y = K$$

Where $X$is the bucket size of TokenIn, $Y$is the bucket size of TokenOut, $x$ is the amountIn, $y$ is the amountOut, $K$is a constant, and $p$ is the value of tokenIn quoted in tokenOut.

ConstantSumPricingModule is an IPricingModule that implements a constant-sum pricing formula for a two-asset pool.

https://github.com/mento-protocol/mento-core/blob/main/contracts/swap/ConstantSumPricingModule.sol

ConstantSumPricingModule.sol

ConstantProductPricingModule

$$X*p*Y=K \newline (X + x)*p*( Y - y) = K$$

Where $X$is the bucket size of TokenIn, $Y$is the bucket size of TokenOut, $x$is the amountIn, $y$ is the amountOut, $K$is a constant, and $p$ is the value of tokenIn quoted in tokenOut.

ConstantProductPricingModule is an IPricingModule that implements a constant-product pricing formula for a two-asset pool.

https://github.com/mento-protocol/mento-core/blob/main/contracts/swap/ConstantProductPricingModule.sol

ConstantProductPricingModule.sol