diff --git a/lib/utils/neynar-client.js b/lib/utils/neynar-client.js
new file mode 100644
index 000000000..ee97a3919
--- /dev/null
+++ b/lib/utils/neynar-client.js
@@ -0,0 +1,83 @@
+// @flow
+
+import invariant from 'invariant';
+
+type FarcasterUser = {
+  +fid: number,
+  +viewerContext: {
+    +following: boolean,
+  },
+  ...
+};
+
+type FetchFollowersResponse = {
+  +result: {
+    +users: $ReadOnlyArray<FarcasterUser>,
+    +next: {
+      +cursor: string,
+    },
+  },
+};
+
+const neynarBaseURL = 'https://api.neynar.com/';
+const neynarURLs = {
+  '1': `${neynarBaseURL}v1/farcaster/`,
+};
+function getNeynarURL(
+  apiVersion: string,
+  apiCall: string,
+  params: { [string]: string },
+): string {
+  const neynarURL = neynarURLs[apiVersion];
+  invariant(
+    neynarURL,
+    `could not find Neynar URL for apiVersion ${apiVersion}`,
+  );
+  return `${neynarURL}${apiCall}?${new URLSearchParams(params).toString()}`;
+}
+
+const fetchFollowerLimit = 150;
+
+class NeynarClient {
+  apiKey: string;
+
+  constructor(apiKey: string) {
+    this.apiKey = apiKey;
+  }
+
+  // We're using the term "friend" for a bidirectional follow
+  async fetchFriendFIDs(fid: string): Promise<string[]> {
+    const fids = [];
+    const params: { [string]: string } = {
+      fid,
+      viewerFid: fid,
+      limit: fetchFollowerLimit.toString(),
+    };
+    while (true) {
+      const url = getNeynarURL('1', 'followers', params);
+      const response = await fetch(url, {
+        method: 'GET',
+        headers: {
+          Accept: 'application/json',
+          api_key: this.apiKey,
+        },
+      });
+      const json: FetchFollowersResponse = await response.json();
+      const { users } = json.result;
+      for (const user of users) {
+        if (!user.viewerContext.following) {
+          continue;
+        }
+        fids.push(user.fid.toString());
+      }
+      if (users.length < fetchFollowerLimit) {
+        return fids;
+      }
+      params.cursor = json.result.next.cursor;
+    }
+    // eslint-disable-next-line no-unreachable
+    throw new Error('should not get here');
+  }
+}
+
+export { NeynarClient };