diff --git a/common/calculate-cpmm.ts b/common/calculate-cpmm.ts
index 3470088a..493b5fa9 100644
--- a/common/calculate-cpmm.ts
+++ b/common/calculate-cpmm.ts
@@ -272,16 +272,16 @@ export function getCpmmLiquidityPoolWeights(
   const liquidityShares = liquidities.map(calcLiqudity)
   const shareSum = sum(liquidityShares)
 
-  const includedLiquidities = excludeAntes
-    ? liquidityShares.filter((_, i) => !liquidities[i].isAnte)
-    : liquidityShares
-
-  const weights = includedLiquidities.map((s, i) => ({
-    weight: s / shareSum,
+  const weights = liquidityShares.map((shares, i) => ({
+    weight: shares / shareSum,
     providerId: liquidities[i].userId,
   }))
 
-  const userWeights = groupBy(weights, (w) => w.providerId)
+  const includedWeights = excludeAntes
+    ? weights.filter((_, i) => !liquidities[i].isAnte)
+    : weights
+
+  const userWeights = groupBy(includedWeights, (w) => w.providerId)
   const totalUserWeights = mapValues(userWeights, (userWeight) =>
     sumBy(userWeight, (w) => w.weight)
   )
diff --git a/functions/src/index.ts b/functions/src/index.ts
index d3e9b42f..0d0de3ba 100644
--- a/functions/src/index.ts
+++ b/functions/src/index.ts
@@ -3,7 +3,6 @@ import * as admin from 'firebase-admin'
 admin.initializeApp()
 
 // v1
-export * from './transact'
 export * from './stripe'
 export * from './create-user'
 export * from './on-create-bet'
@@ -28,6 +27,7 @@ export * from './on-create-txn'
 
 // v2
 export * from './health'
+export * from './transact'
 export * from './change-user-info'
 export * from './create-answer'
 export * from './place-bet'
diff --git a/functions/src/stripe.ts b/functions/src/stripe.ts
index 67309aa8..450bbe35 100644
--- a/functions/src/stripe.ts
+++ b/functions/src/stripe.ts
@@ -1,4 +1,4 @@
-import * as functions from 'firebase-functions'
+import { onRequest } from 'firebase-functions/v2/https'
 import * as admin from 'firebase-admin'
 import Stripe from 'stripe'
 
@@ -42,9 +42,9 @@ const manticDollarStripePrice = isProd()
       10000: 'price_1K8bEiGdoFKoCJW7Us4UkRHE',
     }
 
-export const createCheckoutSession = functions
-  .runWith({ minInstances: 1, secrets: ['STRIPE_APIKEY'] })
-  .https.onRequest(async (req, res) => {
+export const createcheckoutsession = onRequest(
+  { minInstances: 1, secrets: ['STRIPE_APIKEY'] },
+  async (req, res) => {
     const userId = req.query.userId?.toString()
 
     const manticDollarQuantity = req.query.manticDollarQuantity?.toString()
@@ -86,14 +86,15 @@ export const createCheckoutSession = functions
     })
 
     res.redirect(303, session.url || '')
-  })
+  }
+)
 
-export const stripeWebhook = functions
-  .runWith({
+export const stripewebhook = onRequest(
+  {
     minInstances: 1,
     secrets: ['MAILGUN_KEY', 'STRIPE_APIKEY', 'STRIPE_WEBHOOKSECRET'],
-  })
-  .https.onRequest(async (req, res) => {
+  },
+  async (req, res) => {
     const stripe = initStripe()
     let event
 
@@ -115,7 +116,8 @@ export const stripeWebhook = functions
     }
 
     res.status(200).send('success')
-  })
+  }
+)
 
 const issueMoneys = async (session: StripeSession) => {
   const { id: sessionId } = session
diff --git a/functions/src/transact.ts b/functions/src/transact.ts
index cd091b83..113afc0b 100644
--- a/functions/src/transact.ts
+++ b/functions/src/transact.ts
@@ -1,40 +1,40 @@
-import * as functions from 'firebase-functions'
 import * as admin from 'firebase-admin'
 
 import { User } from '../../common/user'
 import { Txn } from '../../common/txn'
 import { removeUndefinedProps } from '../../common/util/object'
+import { APIError, newEndpoint } from './api'
 
 export type TxnData = Omit<Txn, 'id' | 'createdTime'>
 
-export const transact = functions
-  .runWith({ minInstances: 1 })
-  .https.onCall(async (data: TxnData, context) => {
-    const userId = context?.auth?.uid
-    if (!userId) return { status: 'error', message: 'Not authorized' }
+// TODO: We totally fail to validate most of the input to this function,
+// so anyone can spam our database with malformed transactions.
 
-    const { amount, fromType, fromId } = data
+export const transact = newEndpoint({}, async (req, auth) => {
+  const data = req.body
+  const { amount, fromType, fromId } = data
 
-    if (fromType !== 'USER')
-      return {
-        status: 'error',
-        message: "From type is only implemented for type 'user'.",
-      }
+  if (fromType !== 'USER')
+    throw new APIError(400, "From type is only implemented for type 'user'.")
 
-    if (fromId !== userId)
-      return {
-        status: 'error',
-        message: 'Must be authenticated with userId equal to specified fromId.',
-      }
+  if (fromId !== auth.uid)
+    throw new APIError(
+      403,
+      'Must be authenticated with userId equal to specified fromId.'
+    )
 
-    if (isNaN(amount) || !isFinite(amount))
-      return { status: 'error', message: 'Invalid amount' }
+  if (isNaN(amount) || !isFinite(amount))
+    throw new APIError(400, 'Invalid amount')
 
-    // Run as transaction to prevent race conditions.
-    return await firestore.runTransaction(async (transaction) => {
-      await runTxn(transaction, data)
-    })
+  // Run as transaction to prevent race conditions.
+  return await firestore.runTransaction(async (transaction) => {
+    const result = await runTxn(transaction, data)
+    if (result.status == 'error') {
+      throw new APIError(500, result.message ?? 'An unknown error occurred.')
+    }
+    return result
   })
+})
 
 export async function runTxn(
   fbTransaction: admin.firestore.Transaction,
diff --git a/web/components/tipper.tsx b/web/components/tipper.tsx
index 6f7dfbcb..e4b6580f 100644
--- a/web/components/tipper.tsx
+++ b/web/components/tipper.tsx
@@ -11,7 +11,7 @@ import { debounce, sum } from 'lodash'
 import { useEffect, useRef, useState } from 'react'
 import { CommentTips } from 'web/hooks/use-tip-txns'
 import { useUser } from 'web/hooks/use-user'
-import { transact } from 'web/lib/firebase/fn-call'
+import { transact } from 'web/lib/firebase/api-call'
 import { track } from 'web/lib/service/analytics'
 import { Row } from './layout/row'
 import { Tooltip } from './tooltip'
diff --git a/web/lib/firebase/api-call.ts b/web/lib/firebase/api-call.ts
index 695117f9..94da9f09 100644
--- a/web/lib/firebase/api-call.ts
+++ b/web/lib/firebase/api-call.ts
@@ -53,6 +53,11 @@ export function getFunctionUrl(name: string) {
 export function createAnswer(params: any) {
   return call(getFunctionUrl('createanswer'), 'POST', params)
 }
+
+export function transact(params: any) {
+  return call(getFunctionUrl('transact'), 'POST', params)
+}
+
 export function changeUserInfo(params: any) {
   return call(getFunctionUrl('changeuserinfo'), 'POST', params)
 }
diff --git a/web/lib/firebase/fn-call.ts b/web/lib/firebase/fn-call.ts
index 27a5e8f3..2f299aea 100644
--- a/web/lib/firebase/fn-call.ts
+++ b/web/lib/firebase/fn-call.ts
@@ -1,5 +1,4 @@
 import { httpsCallable } from 'firebase/functions'
-import { Txn } from 'common/txn'
 import { User } from 'common/user'
 import { randomString } from 'common/util/random'
 import './init'
@@ -9,11 +8,6 @@ import { safeLocalStorage } from '../util/local'
 export const cloudFunction = <RequestData, ResponseData>(name: string) =>
   httpsCallable<RequestData, ResponseData>(functions, name)
 
-export const transact = cloudFunction<
-  Omit<Txn, 'id' | 'createdTime'>,
-  { status: 'error' | 'success'; message?: string; txn?: Txn }
->('transact')
-
 export const createUser: () => Promise<User | null> = () => {
   const local = safeLocalStorage()
   let deviceToken = local?.getItem('device-token')
diff --git a/web/lib/firebase/users.ts b/web/lib/firebase/users.ts
index e72fe141..7f007031 100644
--- a/web/lib/firebase/users.ts
+++ b/web/lib/firebase/users.ts
@@ -39,6 +39,9 @@ import { filterDefined } from 'common/util/array'
 import { addUserToGroupViaSlug } from 'web/lib/firebase/groups'
 import { removeUndefinedProps } from 'common/util/object'
 import dayjs from 'dayjs'
+import utc from 'dayjs/plugin/utc'
+dayjs.extend(utc)
+
 import { track } from '@amplitude/analytics-browser'
 
 export const users = coll<User>('users')
diff --git a/web/lib/service/stripe.ts b/web/lib/service/stripe.ts
index 395f7093..bedd68aa 100644
--- a/web/lib/service/stripe.ts
+++ b/web/lib/service/stripe.ts
@@ -1,12 +1,11 @@
-import { PROJECT_ID } from 'common/envs/constants'
+import { getFunctionUrl } from 'web/lib/firebase/api-call'
 
 export const checkoutURL = (
   userId: string,
   manticDollarQuantity: number,
   referer = ''
 ) => {
-  const endpoint = `https://us-central1-${PROJECT_ID}.cloudfunctions.net/createCheckoutSession`
-
+  const endpoint = getFunctionUrl('createcheckoutsession')
   return `${endpoint}?userId=${userId}&manticDollarQuantity=${manticDollarQuantity}&referer=${encodeURIComponent(
     referer
   )}`
diff --git a/web/pages/charity/[charitySlug].tsx b/web/pages/charity/[charitySlug].tsx
index 7c3ce51b..c3e0912a 100644
--- a/web/pages/charity/[charitySlug].tsx
+++ b/web/pages/charity/[charitySlug].tsx
@@ -10,7 +10,7 @@ import { Spacer } from 'web/components/layout/spacer'
 import { User } from 'common/user'
 import { useUser } from 'web/hooks/use-user'
 import { Linkify } from 'web/components/linkify'
-import { transact } from 'web/lib/firebase/fn-call'
+import { transact } from 'web/lib/firebase/api-call'
 import { charities, Charity } from 'common/charity'
 import { useRouter } from 'next/router'
 import Custom404 from '../404'