use deductFixedFees

common/calculate-cpmm.ts

@@ -1,6 +1,8 @@
 import * as _ from 'lodash'
 import { Bet } from './bet'
+import { deductFixedFees } from './calculate-fixed-payouts'
 import { Binary, CPMM, FullContract } from './contract'
+import { CREATOR_FEE } from './fees'
 
 export function getCpmmProbability(pool: { [outcome: string]: number }) {
   // For binary contracts only.
@@ -85,7 +87,11 @@ export function calculateCpmmSale(
 
   const newPool = { YES: newY, NO: newN }
 
-  return { saleValue, newPool }
+  const profit = saleValue - bet.amount
+  const creatorFee = CREATOR_FEE * Math.max(0, profit)
+  const saleAmount = deductFixedFees(bet.amount, saleValue)
+
+  return { saleValue, newPool, creatorFee, saleAmount }
 }
 
 export function getCpmmProbabilityAfterSale(

common/calculate-fixed-payouts.ts

@@ -21,7 +21,7 @@ export function calculateFixedCancelPayout(bet: Bet) {
 export function calculateStandardFixedPayout(bet: Bet, outcome: string) {
   const { amount, outcome: betOutcome, shares } = bet
   if (betOutcome !== outcome) return 0
-  return deductFixedFees(amount, shares - amount)
+  return deductFixedFees(amount, shares)
 }
 
 function calculateFixedMktPayout(
@@ -43,7 +43,8 @@ function calculateFixedMktPayout(
 }
 
 export const deductFixedFees = (betAmount: number, winnings: number) => {
-  return winnings > betAmount
+  return winnings
-    ? betAmount + (1 - FEES) * (winnings - betAmount)
+  //   return winnings > betAmount
-    : winnings
+  //     ? betAmount + (1 - FEES) * (winnings - betAmount)
+  //     : winnings
 }

common/sell-bet.ts

@@ -4,11 +4,7 @@ import {
   calculateDpmShareValue,
   deductDpmFees,
 } from './calculate-dpm'
-import {
+import { calculateCpmmSale, getCpmmProbability } from './calculate-cpmm'
-  calculateCpmmSale,
-  calculateCpmmShareValue,
-  getCpmmProbability,
-} from './calculate-cpmm'
 import { Binary, DPM, CPMM, FullContract } from './contract'
 import { CREATOR_FEE } from './fees'
 import { User } from './user'
@@ -87,15 +83,14 @@ export const getCpmmSellBetInfo = (
   const { pool } = contract
   const { id: betId, amount, shares, outcome } = bet
 
-  const { saleValue, newPool } = calculateCpmmSale(contract, bet)
+  const { saleValue, newPool, creatorFee, saleAmount } = calculateCpmmSale(
+    contract,
+    bet
+  )
 
   const probBefore = getCpmmProbability(pool)
   const probAfter = getCpmmProbability(newPool)
 
-  const profit = saleValue - amount
-  const creatorFee = CREATOR_FEE * Math.max(0, profit)
-  const saleAmount = deductDpmFees(amount, profit)
-
   console.log(
     'SELL M$',
     amount,