2.0.19 • Published 2 years ago
test-crema-sdk v2.0.19
Install:
npm i @cremafinance/crema-sdk
Build:
npm run build
Instructions:
import { TokenSwap } from '@cremafinance/crema-sdk'
const swap = await new TokenSwap(conn, swapProgramId, swapKey, null).load()
const amountOut: any = await swap.preSwapA(amountIn) // a->b
const amountOut: any = await swap.preSwapB(amountIn) // b->a
Parameters Description:
amountIn: Decimal (using decimal.js repo)
Liquidity Calculation Formula
Assuming the current price is $P{c}$,the price range that users add liquidity in is $[P{a},P_{b}]$
$ \LARGE L = \begin {cases} ¦ {Δx} \over {1 \over {\sqrt{P{a}}}} - {1 \over {\sqrt{P{b}}}} &, \text P{c} < P{a} \ \ ¦ {Δy} \over {\sqrt{P{b}} - \sqrt{P{a}}} &, \text P{c} > P{b}\ ¦ {{Δx} \over {1 \over {\sqrt{P{c}}}} - {1 \over {\sqrt{P{b}}}}} = {{Δy} \over {\sqrt{P{c}} - \sqrt{P{a}}}} &, \text P{c} \in [P{a},P_{b}] \ \ \end {cases} $
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