Add quadratic matching to Manifold for Charity (#486)
* Calculate quadratic funding match * Tweak copy * More concise quadratic funding calculation Co-authored-by: Sinclair Chen <abc.sinclair@gmail.com> * Fix imports and calculations * Remove unused var for now * Clean up styling Co-authored-by: Sinclair Chen <abc.sinclair@gmail.com>
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Austin Chen
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27
common/quadratic-funding.ts
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27
common/quadratic-funding.ts
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@ -0,0 +1,27 @@
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import { groupBy, mapValues, sum, sumBy } from 'lodash'
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import { Txn } from './txn'
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// Returns a map of charity ids to the amount of M$ matched
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export function quadraticMatches(
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allCharityTxns: Txn[],
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matchingPool: number
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): Record<string, number> {
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// For each charity, group the donations by each individual donor
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const donationsByCharity = groupBy(allCharityTxns, 'toId')
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const donationsByDonors = mapValues(donationsByCharity, (txns) =>
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groupBy(txns, 'fromId')
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)
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// Weight for each charity = [sum of sqrt(individual donor)] ^ 2
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const weights = mapValues(donationsByDonors, (byDonor) => {
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const sumByDonor = Object.values(byDonor).map((txns) =>
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sumBy(txns, 'amount')
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)
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const sumOfRoots = sumBy(sumByDonor, Math.sqrt)
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return sumOfRoots ** 2
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})
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// Then distribute the matching pool based on the individual weights
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const totalWeight = sum(Object.values(weights))
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return mapValues(weights, (weight) => matchingPool * (weight / totalWeight))
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}
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@ -6,9 +6,11 @@ import { Charity } from 'common/charity'
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import { useCharityTxns } from 'web/hooks/use-charity-txns'
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import { manaToUSD } from '../../../common/util/format'
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import { Row } from '../layout/row'
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import { Col } from '../layout/col'
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export function CharityCard(props: { charity: Charity }) {
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const { slug, photo, preview, id, tags } = props.charity
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export function CharityCard(props: { charity: Charity; match?: number }) {
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const { charity, match } = props
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const { slug, photo, preview, id, tags } = charity
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const txns = useCharityTxns(id)
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const raised = sumBy(txns, (txn) => txn.amount)
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@ -32,14 +34,22 @@ export function CharityCard(props: { charity: Charity }) {
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{/* <h3 className="card-title line-clamp-3">{name}</h3> */}
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<div className="line-clamp-4 text-sm">{preview}</div>
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{raised > 0 && (
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<Row className="text-primary mt-4 flex-1 items-end justify-center gap-2">
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<span className="text-3xl">
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{raised < 100
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? manaToUSD(raised)
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: '$' + Math.floor(raised / 100)}
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<>
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<Row className="mt-4 flex-1 items-end justify-center gap-6 text-gray-900">
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<Col>
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<span className="text-3xl font-semibold">
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{formatUsd(raised)}
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</span>
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<span>raised</span>
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</Col>
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{match && (
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<Col className="text-gray-500">
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<span className="text-xl">+{formatUsd(match)}</span>
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<span className="">match</span>
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</Col>
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)}
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</Row>
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</>
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)}
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</div>
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</div>
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@ -47,6 +57,10 @@ export function CharityCard(props: { charity: Charity }) {
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)
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}
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function formatUsd(mana: number) {
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return mana < 100 ? manaToUSD(mana) : '$' + Math.floor(mana / 100)
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}
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function FeaturedBadge() {
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return (
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<span className="inline-flex items-center gap-1 bg-yellow-100 px-3 py-0.5 text-sm font-medium text-yellow-800">
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@ -1,4 +1,12 @@
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import { mapValues, groupBy, sumBy, sum, sortBy, debounce } from 'lodash'
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import {
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mapValues,
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groupBy,
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sumBy,
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sum,
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sortBy,
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debounce,
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uniqBy,
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} from 'lodash'
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import { useState, useMemo } from 'react'
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import { charities, Charity as CharityType } from 'common/charity'
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import { CharityCard } from 'web/components/charity/charity-card'
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@ -8,7 +16,9 @@ import { Page } from 'web/components/page'
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import { SiteLink } from 'web/components/site-link'
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import { Title } from 'web/components/title'
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import { getAllCharityTxns } from 'web/lib/firebase/txns'
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import { formatMoney } from 'common/util/format'
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import { formatMoney, manaToUSD } from 'common/util/format'
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import { quadraticMatches } from 'common/quadratic-funding'
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import { Txn } from 'common/txn'
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export async function getStaticProps() {
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const txns = await getAllCharityTxns()
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@ -20,21 +30,55 @@ export async function getStaticProps() {
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(charity) => (charity.tags?.includes('Featured') ? 0 : 1),
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(charity) => -totals[charity.id],
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])
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const matches = quadraticMatches(txns, totalRaised)
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const numDonors = uniqBy(txns, (txn) => txn.fromId).length
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return {
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props: {
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totalRaised,
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charities: sortedCharities,
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matches,
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txns,
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numDonors,
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},
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revalidate: 60,
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}
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}
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type Stat = {
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name: string
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stat: string
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}
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function DonatedStats(props: { stats: Stat[] }) {
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const { stats } = props
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return (
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<dl className="mt-3 grid grid-cols-1 gap-5 rounded-lg bg-gradient-to-r from-pink-300 via-purple-300 to-indigo-400 p-4 sm:grid-cols-3">
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{stats.map((item) => (
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<div
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key={item.name}
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className="overflow-hidden rounded-lg bg-white px-4 py-5 shadow sm:p-6"
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>
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<dt className="truncate text-sm font-medium text-gray-500">
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{item.name}
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</dt>
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<dd className="mt-1 text-3xl font-semibold text-gray-900">
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{item.stat}
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</dd>
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</div>
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))}
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</dl>
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)
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}
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export default function Charity(props: {
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totalRaised: number
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charities: CharityType[]
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matches: { [charityId: string]: number }
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txns: Txn[]
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numDonors: number
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}) {
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const { totalRaised, charities } = props
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const { totalRaised, charities, matches, numDonors } = props
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const [query, setQuery] = useState('')
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const debouncedQuery = debounce(setQuery, 50)
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@ -54,26 +98,44 @@ export default function Charity(props: {
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return (
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<Page>
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<Col className="w-full rounded px-4 py-6 sm:px-8 xl:w-[125%]">
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<Col className="max-w-xl gap-2">
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<Col className="">
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<Title className="!mt-0" text="Manifold for Charity" />
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<div className="mb-6 text-gray-500">
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Donate your winnings to charity! Every {formatMoney(100)} you give
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turns into $1 USD we send to your chosen charity.
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<Spacer h={5} />
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Together we've donated over ${Math.floor(totalRaised / 100)} USD so
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far!
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</div>
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<span className="text-gray-600">
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Donate your winnings: every {formatMoney(100)} you contribute turns
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into $1 USD to your chosen charity!
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</span>
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<DonatedStats
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stats={[
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{
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name: 'Raised by Manifold users',
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stat: manaToUSD(totalRaised),
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},
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{
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name: 'Number of donors',
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stat: `${numDonors}`,
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},
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{
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name: 'Matched via quadratic funding',
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stat: manaToUSD(sum(Object.values(matches))),
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},
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]}
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/>
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<Spacer h={10} />
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<input
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type="text"
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onChange={(e) => debouncedQuery(e.target.value)}
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placeholder="Search charities"
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placeholder="Find a charity"
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className="input input-bordered mb-6 w-full"
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/>
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</Col>
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<div className="grid max-w-xl grid-flow-row grid-cols-1 gap-4 lg:max-w-full lg:grid-cols-2 xl:grid-cols-3">
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{filterCharities.map((charity) => (
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<CharityCard charity={charity} key={charity.name} />
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<CharityCard
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charity={charity}
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key={charity.name}
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match={matches[charity.id]}
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/>
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))}
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</div>
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{filterCharities.length === 0 && (
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@ -91,22 +153,28 @@ export default function Charity(props: {
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></iframe>
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<div className="mt-10 text-gray-500">
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Don't see your favorite charity? Recommend it{' '}
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<SiteLink
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href="https://manifold.markets/Sinclair/which-charities-should-manifold-add"
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className="text-indigo-700"
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>
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here
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</SiteLink>
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!
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Don't see your favorite charity? Recommend it by emailing
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charity@manifold.markets!
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<br />
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<br />
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<span className="italic">
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Note: Manifold is not affiliated with non-Featured charities; we're
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just fans of their work!
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Notes:
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<br />
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As Manifold is a for-profit entity, your contributions will not be
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tax deductible.
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- Manifold is not affiliated with non-Featured charities; we're just
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fans of their work!
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<br />
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- As Manifold itself is a for-profit entity, your contributions will
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not be tax deductible.
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<br />- Donation matches are courtesy of{' '}
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<SiteLink href="https://ftxfuturefund.org/" className="font-bold">
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the FTX Future Fund
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</SiteLink>
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, and are allocated via{' '}
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<SiteLink href="https://wtfisqf.com/" className="font-bold">
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quadratic funding
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</SiteLink>
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.
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<br />- Donations + matches are wired once each quarter.
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</span>
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</div>
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</Col>
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