109 lines
2.8 KiB
TypeScript
109 lines
2.8 KiB
TypeScript
import { Bet } from './bet'
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import { getProbability } from './calculate'
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import { getCpmmLiquidityPoolWeights } from './calculate-cpmm'
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import { CPMMContract } from './contract'
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import { noFees } from './fees'
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import { LiquidityProvision } from './liquidity-provision'
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export const getFixedCancelPayouts = (
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bets: Bet[],
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liquidities: LiquidityProvision[]
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) => {
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const liquidityPayouts = liquidities.map((lp) => ({
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userId: lp.userId,
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payout: lp.amount,
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}))
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const payouts = bets
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.filter((b) => !b.isAnte && !b.isLiquidityProvision)
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.map((bet) => ({
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userId: bet.userId,
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payout: bet.amount,
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}))
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const creatorPayout = 0
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return { payouts, creatorPayout, liquidityPayouts, collectedFees: noFees }
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}
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export const getStandardFixedPayouts = (
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outcome: string,
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contract: CPMMContract,
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bets: Bet[],
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liquidities: LiquidityProvision[]
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) => {
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const winningBets = bets.filter((bet) => bet.outcome === outcome)
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const payouts = winningBets.map(({ userId, shares }) => ({
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userId,
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payout: shares,
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}))
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const { collectedFees } = contract
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const creatorPayout = collectedFees.creatorFee
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const liquidityPayouts = getLiquidityPoolPayouts(
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contract,
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outcome,
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liquidities
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)
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return { payouts, creatorPayout, liquidityPayouts, collectedFees }
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}
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export const getLiquidityPoolPayouts = (
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contract: CPMMContract,
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outcome: string,
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liquidities: LiquidityProvision[]
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) => {
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const { pool, subsidyPool } = contract
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const finalPool = pool[outcome] + (subsidyPool ?? 0)
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if (finalPool < 1e-3) return []
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const weights = getCpmmLiquidityPoolWeights(liquidities)
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return Object.entries(weights).map(([providerId, weight]) => ({
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userId: providerId,
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payout: weight * finalPool,
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}))
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}
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export const getMktFixedPayouts = (
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contract: CPMMContract,
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bets: Bet[],
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liquidities: LiquidityProvision[],
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resolutionProbability?: number
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) => {
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const p =
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resolutionProbability === undefined
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? getProbability(contract)
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: resolutionProbability
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const payouts = bets.map(({ userId, outcome, shares }) => {
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const betP = outcome === 'YES' ? p : 1 - p
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return { userId, payout: betP * shares }
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})
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const { collectedFees } = contract
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const creatorPayout = collectedFees.creatorFee
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const liquidityPayouts = getLiquidityPoolProbPayouts(contract, p, liquidities)
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return { payouts, creatorPayout, liquidityPayouts, collectedFees }
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}
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export const getLiquidityPoolProbPayouts = (
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contract: CPMMContract,
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p: number,
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liquidities: LiquidityProvision[]
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) => {
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const { pool, subsidyPool } = contract
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const finalPool = p * pool.YES + (1 - p) * pool.NO + (subsidyPool ?? 0)
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if (finalPool < 1e-3) return []
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const weights = getCpmmLiquidityPoolWeights(liquidities)
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return Object.entries(weights).map(([providerId, weight]) => ({
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userId: providerId,
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payout: weight * finalPool,
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}))
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}
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