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diff --git a/lib/utils/neynar-client.js b/lib/utils/neynar-client.js
new file mode 100644
--- /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 };

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