diff --git a/functions/src/close-market.ts b/functions/src/close-market.ts
new file mode 100644
index 00000000..86d73107
--- /dev/null
+++ b/functions/src/close-market.ts
@@ -0,0 +1,50 @@
+import * as admin from 'firebase-admin'
+import { z } from 'zod'
+
+import { Contract } from '../../common/contract'
+import { getUser } from './utils'
+
+import { isAdmin, isManifoldId } from '../../common/envs/constants'
+import { APIError, newEndpoint, validate } from './api'
+
+const bodySchema = z.object({
+  contractId: z.string(),
+})
+
+export const closemarket = newEndpoint({}, async (req, auth) => {
+  const { contractId } = validate(bodySchema, req.body)
+  const contractDoc = firestore.doc(`contracts/${contractId}`)
+  const contractSnap = await contractDoc.get()
+  if (!contractSnap.exists)
+    throw new APIError(404, 'No contract exists with the provided ID')
+  const contract = contractSnap.data() as Contract
+  const { creatorId, closeTime } = contract
+  const firebaseUser = await admin.auth().getUser(auth.uid)
+
+  if (
+    creatorId !== auth.uid &&
+    !isManifoldId(auth.uid) &&
+    !isAdmin(firebaseUser.email)
+  )
+    throw new APIError(403, 'User is not creator of contract')
+
+  const now = Date.now()
+  if (closeTime && closeTime < now)
+    throw new APIError(400, 'Contract already closed')
+
+  const creator = await getUser(creatorId)
+  if (!creator) throw new APIError(500, 'Creator not found')
+
+  const updatedContract = {
+    ...contract,
+    closeTime: now,
+  }
+
+  await contractDoc.update(updatedContract)
+
+  console.log('contract ', contractId, 'closed')
+
+  return updatedContract
+})
+
+const firestore = admin.firestore()
diff --git a/functions/src/index.ts b/functions/src/index.ts
index adfee75e..2cb6f515 100644
--- a/functions/src/index.ts
+++ b/functions/src/index.ts
@@ -50,6 +50,7 @@ export * from './resolve-market'
 export * from './unsubscribe'
 export * from './stripe'
 export * from './mana-bonus-email'
+export * from './close-market'
 
 import { health } from './health'
 import { transact } from './transact'
@@ -66,6 +67,7 @@ import { addliquidity } from './add-liquidity'
 import { withdrawliquidity } from './withdraw-liquidity'
 import { creategroup } from './create-group'
 import { resolvemarket } from './resolve-market'
+import { closemarket } from './close-market'
 import { unsubscribe } from './unsubscribe'
 import { stripewebhook, createcheckoutsession } from './stripe'
 import { getcurrentuser } from './get-current-user'
@@ -91,6 +93,7 @@ const addLiquidityFunction = toCloudFunction(addliquidity)
 const withdrawLiquidityFunction = toCloudFunction(withdrawliquidity)
 const createGroupFunction = toCloudFunction(creategroup)
 const resolveMarketFunction = toCloudFunction(resolvemarket)
+const closeMarketFunction = toCloudFunction(closemarket)
 const unsubscribeFunction = toCloudFunction(unsubscribe)
 const stripeWebhookFunction = toCloudFunction(stripewebhook)
 const createCheckoutSessionFunction = toCloudFunction(createcheckoutsession)
@@ -115,11 +118,12 @@ export {
   withdrawLiquidityFunction as withdrawliquidity,
   createGroupFunction as creategroup,
   resolveMarketFunction as resolvemarket,
+  closeMarketFunction as closemarket,
   unsubscribeFunction as unsubscribe,
   stripeWebhookFunction as stripewebhook,
   createCheckoutSessionFunction as createcheckoutsession,
   getCurrentUserFunction as getcurrentuser,
   acceptChallenge as acceptchallenge,
   createPostFunction as createpost,
-  saveTwitchCredentials as savetwitchcredentials
+  saveTwitchCredentials as savetwitchcredentials,
 }
diff --git a/web/next.config.js b/web/next.config.js
index cf727fd4..21b375ba 100644
--- a/web/next.config.js
+++ b/web/next.config.js
@@ -9,6 +9,9 @@ module.exports = {
   reactStrictMode: true,
   optimizeFonts: false,
   experimental: {
+    images: {
+      allowFutureImage: true,
+    },
     scrollRestoration: true,
     externalDir: true,
     modularizeImports: {
diff --git a/web/pages/api/v0/market/[id]/close.ts b/web/pages/api/v0/market/[id]/close.ts
new file mode 100644
index 00000000..d1c9ac5e
--- /dev/null
+++ b/web/pages/api/v0/market/[id]/close.ts
@@ -0,0 +1,28 @@
+import { NextApiRequest, NextApiResponse } from 'next'
+import {
+  CORS_ORIGIN_MANIFOLD,
+  CORS_ORIGIN_LOCALHOST,
+} from 'common/envs/constants'
+import { applyCorsHeaders } from 'web/lib/api/cors'
+import { fetchBackend, forwardResponse } from 'web/lib/api/proxy'
+
+export const config = { api: { bodyParser: true } }
+
+export default async function route(req: NextApiRequest, res: NextApiResponse) {
+  await applyCorsHeaders(req, res, {
+    origin: [CORS_ORIGIN_MANIFOLD, CORS_ORIGIN_LOCALHOST],
+    methods: 'POST',
+  })
+
+  const { id } = req.query
+  const contractId = id as string
+
+  if (req.body) req.body.contractId = contractId
+  try {
+    const backendRes = await fetchBackend(req, 'closemarket')
+    await forwardResponse(res, backendRes)
+  } catch (err) {
+    console.error('Error talking to cloud function: ', err)
+    res.status(500).json({ message: 'Error communicating with backend.' })
+  }
+}