diff --git a/web/lib/api/graphql/datasources/firebaseAPI.ts b/web/lib/api/graphql/datasources/firebaseAPI.ts
new file mode 100644
index 00000000..a923f6a0
--- /dev/null
+++ b/web/lib/api/graphql/datasources/firebaseAPI.ts
@@ -0,0 +1,108 @@
+import type { Contract, BinaryContract } from 'common/contract'
+
+import { getOutcomeProbability, getProbability } from 'common/calculate'
+import { listAllBets } from 'web/lib/firebase/bets'
+import {
+  getContractFromId,
+  getContractFromSlug,
+  listAllContracts,
+} from 'web/lib/firebase/contracts'
+import { listAllComments } from 'web/lib/firebase/comments'
+import { getUser } from 'web/lib/firebase/users'
+
+import { DataSource } from 'apollo-datasource'
+import { InMemoryLRUCache, KeyValueCache } from 'apollo-server-caching'
+
+/* Simple wrapper around web/lib/firebase functions */
+export class FirebaseAPI extends DataSource {
+  cache: KeyValueCache
+  context?: any
+
+  constructor() {
+    super()
+    this.cache = null as any
+  }
+
+  initialize({
+    context,
+    cache,
+  }: { context?: any; cache?: KeyValueCache } = {}) {
+    this.context = context
+    this.cache = cache || new InMemoryLRUCache()
+  }
+
+  didEncounterError(error: any) {
+    throw error
+  }
+
+  cacheKey(id: string | undefined, type: string) {
+    return `firebaseapi-${type}-${id}`
+  }
+
+  async get<T>(
+    id: string | undefined,
+    type: string,
+    func: () => Promise<T>,
+    { ttlInSeconds = 200 }: { ttlInSeconds?: number } = {}
+  ): Promise<T> {
+    const cacheDoc = await this.cache.get(this.cacheKey(id, type))
+    if (cacheDoc) {
+      return JSON.parse(cacheDoc)
+    }
+
+    const doc = await func()
+
+    if (ttlInSeconds) {
+      this.cache.set(this.cacheKey(id, type), JSON.stringify(doc), {
+        ttl: ttlInSeconds,
+      })
+    }
+
+    return doc
+  }
+
+  async listAllBets(id: string) {
+    return this.get(id, 'listAllBets', () => listAllBets(id))
+  }
+
+  async getContractFromSlug(id: string) {
+    return this.get(id, 'getContractFromSlug', () => getContractFromSlug(id))
+  }
+
+  async getContractFromID(id: string) {
+    return this.get(id, 'market', () => getContractFromId(id))
+  }
+
+  async getOutcomeProbability(contract: Contract, answerID: string) {
+    return this.get(answerID, 'getOutcomeProbability', () =>
+      (async () => getOutcomeProbability(contract, answerID))()
+    )
+  }
+
+  async getProbability(contract: BinaryContract) {
+    return this.get(contract.id, 'getProbability', () =>
+      (async () => getProbability(contract))()
+    )
+  }
+
+  async listAllCommentAnswers(commentId: string, contractID: string) {
+    return this.get(commentId, 'listAllCommentAnswers', async () => {
+      const allComments = await this.listAllComments(contractID)
+      return allComments.filter((c) => c.replyToCommentId === commentId)
+    })
+  }
+
+  async listAllComments(id: string) {
+    return this.get(id, 'listAllComments', () => listAllComments(id))
+  }
+
+  async listAllContracts(limit = 1000, before?: string) {
+    return this.get(before, 'listAllContracts', () =>
+      listAllContracts(limit, before)
+    )
+  }
+
+  async getUser(id: string) {
+    return this.get(id, 'user', () => getUser(id))
+  }
+}
diff --git a/web/lib/api/graphql/datasources/index.ts b/web/lib/api/graphql/datasources/index.ts
new file mode 100644
index 00000000..dcfc198b
--- /dev/null
+++ b/web/lib/api/graphql/datasources/index.ts
@@ -0,0 +1,10 @@
+import type { contextType } from '../types'
+
+import { FirebaseAPI } from './firebaseAPI'
+
+const dataSources = () =>
+  ({
+    firebaseAPI: new FirebaseAPI(),
+  } as contextType['dataSources'])
+
+export default dataSources
diff --git a/web/lib/api/graphql/index.ts b/web/lib/api/graphql/index.ts
index 53164e2d..54771fd3 100644
--- a/web/lib/api/graphql/index.ts
+++ b/web/lib/api/graphql/index.ts
@@ -1,6 +1,7 @@
 import { ApolloServer } from 'apollo-server-micro'
 import { ApolloServerPluginLandingPageGraphQLPlayground } from 'apollo-server-core'
 
+import dataSources from './datasources'
 import resolvers from './resolvers'
 import typeDefs from 'web/generated/schema.graphql'
 
@@ -9,6 +10,7 @@ export const apolloServer = new ApolloServer({
   cache: 'bounded',
   plugins: [ApolloServerPluginLandingPageGraphQLPlayground()],
 
+  dataSources,
   resolvers,
   typeDefs,
 })
diff --git a/web/lib/api/graphql/types.ts b/web/lib/api/graphql/types.ts
new file mode 100644
index 00000000..0ef7ef15
--- /dev/null
+++ b/web/lib/api/graphql/types.ts
@@ -0,0 +1,8 @@
+import type { FirebaseAPI } from './datasources/firebaseAPI'
+
+/* Context type */
+export type contextType = {
+  dataSources: {
+    firebaseAPI: FirebaseAPI
+  }
+}
diff --git a/web/package.json b/web/package.json
index 2dd88de5..7a591a35 100644
--- a/web/package.json
+++ b/web/package.json
@@ -36,6 +36,7 @@
     "@tiptap/react": "2.0.0-beta.114",
     "@tiptap/starter-kit": "2.0.0-beta.190",
     "algoliasearch": "4.13.0",
+    "apollo-server-caching": "3.3.0",
     "apollo-server-micro": "3.10.0",
     "clsx": "1.1.1",
     "cors": "2.8.5",
diff --git a/yarn.lock b/yarn.lock
index e2a137fa..785a8215 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -4858,6 +4858,13 @@ apollo-reporting-protobuf@^3.3.1, apollo-reporting-protobuf@^3.3.2:
   dependencies:
     "@apollo/protobufjs" "1.2.4"
 
+apollo-server-caching@3.3.0:
+  version "3.3.0"
+  resolved "https://registry.yarnpkg.com/apollo-server-caching/-/apollo-server-caching-3.3.0.tgz#f501cbeb820a4201d98c2b768c085f22848d9dc5"
+  integrity sha512-Wgcb0ArjZ5DjQ7ID+tvxUcZ7Yxdbk5l1MxZL8D8gkyjooOkhPNzjRVQ7ubPoXqO54PrOMOTm1ejVhsF+AfIirQ==
+  dependencies:
+    lru-cache "^6.0.0"
+
 apollo-server-core@^3.10.0:
   version "3.10.0"
   resolved "https://registry.yarnpkg.com/apollo-server-core/-/apollo-server-core-3.10.0.tgz#6680b4eb4699829ed50d8a592721ee5e5e11e041"