diff --git a/src/api/f.ts b/src/api/f.ts
index d55de25..8047e61 100644
--- a/src/api/f.ts
+++ b/src/api/f.ts
@@ -1,19 +1,20 @@
 import fetch from 'node-fetch';
 import createDebug from 'debug';
 import { ErrorResponse } from './util.js';
+import { version } from '../util.js';
 
 const debugS2s = createDebug('api:s2s');
 const debugFlapg = createDebug('api:flapg');
 const debugZncaApi = createDebug('api:znca-api');
 
-export async function getLoginHash(token: string, timestamp: string | number) {
+export async function getLoginHash(token: string, timestamp: string | number, useragent?: string) {
     debugS2s('Getting login hash');
 
     const response = await fetch('https://elifessler.com/s2s/api/gen2', {
         method: 'POST',
         headers: {
             'Content-Type': 'application/x-www-form-urlencoded',
-            'User-Agent': 'discord-switch-presence/1.0.0',
+            'User-Agent': (useragent ? useragent + ' ' : '') + 'nxapi/' + version,
         },
         body: new URLSearchParams({
             naIdToken: token,
@@ -32,8 +33,11 @@ export async function getLoginHash(token: string, timestamp: string | number) {
     return data.hash;
 }
 
-export async function flapg(token: string, timestamp: string | number, guid: string, iid: FlapgIid) {
-    const hash = await getLoginHash(token, timestamp);
+export async function flapg(
+    token: string, timestamp: string | number, guid: string, iid: FlapgIid,
+    useragent?: string
+) {
+    const hash = await getLoginHash(token, timestamp, useragent);
 
     debugFlapg('Getting f parameter', {
         token, timestamp, guid, iid,
@@ -41,6 +45,7 @@ export async function flapg(token: string, timestamp: string | number, guid: str
 
     const response = await fetch('https://flapg.com/ika2/api/login?public', {
         headers: {
+            'User-Agent': (useragent ? useragent + ' ' : '') + 'nxapi/' + version,
             'x-token': token,
             'x-time': '' + timestamp,
             'x-guid': guid,
@@ -57,7 +62,10 @@ export async function flapg(token: string, timestamp: string | number, guid: str
     return data.result;
 }
 
-export async function genf(url: string, token: string, timestamp: string | number, uuid: string, type: FlapgIid) {
+export async function genf(
+    url: string, token: string, timestamp: string | number, uuid: string, type: FlapgIid,
+    useragent?: string
+) {
     debugZncaApi('Getting f parameter', {
         url, token, timestamp, uuid,
     });
@@ -73,6 +81,7 @@ export async function genf(url: string, token: string, timestamp: string | numbe
         method: 'POST',
         headers: {
             'Content-Type': 'application/json',
+            'User-Agent': (useragent ? useragent + ' ' : '') + 'nxapi/' + version,
         },
         body: JSON.stringify(req),
     });
@@ -89,8 +98,11 @@ export async function genf(url: string, token: string, timestamp: string | numbe
     return data.f;
 }
 
-export async function genfc(url: string, token: string, timestamp: string | number, uuid: string, type: FlapgIid) {
-    const f = await genf(url, token, timestamp, uuid, type);
+export async function genfc(
+    url: string, token: string, timestamp: string | number, uuid: string, type: FlapgIid,
+    useragent?: string
+) {
+    const f = await genf(url, token, timestamp, uuid, type, useragent);
 
     return {
         f,
diff --git a/src/api/znc-proxy.ts b/src/api/znc-proxy.ts
index 234848a..40a9490 100644
--- a/src/api/znc-proxy.ts
+++ b/src/api/znc-proxy.ts
@@ -3,16 +3,19 @@ import createDebug from 'debug';
 import { ActiveEvent, Announcement, CurrentUser, Friend, WebService, WebServiceToken } from './znc-types.js';
 import { ErrorResponse } from './util.js';
 import ZncApi from './znc.js';
-import { SavedToken } from '../util.js';
+import { SavedToken, version } from '../util.js';
 
 const debug = createDebug('api:znc-proxy');
 
 export default class ZncProxyApi implements ZncApi {
+    static useragent: string | null = null;
+
     constructor(
         private url: string,
         // ZncApi uses the NSO token (valid for a few hours)
         // ZncProxyApi uses the Nintendo Account session token (valid for two years)
-        public token: string
+        public token: string,
+        public useragent = ZncProxyApi.useragent
     ) {}
 
     async fetch<T = unknown>(url: string, method = 'GET', body?: string, headers?: object) {
@@ -20,6 +23,7 @@ export default class ZncProxyApi implements ZncApi {
             method: method,
             headers: Object.assign({
                 'Authorization': 'na ' + this.token,
+                'User-Agent': (this.useragent ? this.useragent + ' ' : '') + 'nxapi/' + version,
             }, headers),
             body: body,
         });
diff --git a/src/api/znc.ts b/src/api/znc.ts
index 965caa9..900dacd 100644
--- a/src/api/znc.ts
+++ b/src/api/znc.ts
@@ -17,6 +17,8 @@ const ZNC_URL = 'https://api-lp1.znc.srv.nintendo.net';
 export const ZNCA_CLIENT_ID = '71b963c1b7b6d119';
 
 export default class ZncApi {
+    static useragent: string | null = null;
+
     constructor(
         public token: string
     ) {}
@@ -93,8 +95,8 @@ export default class ZncApi {
         }));
     }
 
-    static async createWithSessionToken(token: string) {
-        const data = await this.loginWithSessionToken(token);
+    static async createWithSessionToken(token: string, useragent = ZncApi.useragent) {
+        const data = await this.loginWithSessionToken(token, useragent);
 
         return {
             nso: new this(data.credential.accessToken),
@@ -102,15 +104,15 @@ export default class ZncApi {
         };
     }
 
-    async renewToken(token: string) {
-        const data = await ZncApi.loginWithSessionToken(token);
+    async renewToken(token: string, useragent = ZncApi.useragent) {
+        const data = await ZncApi.loginWithSessionToken(token, useragent);
 
         this.token = data.credential.accessToken;
 
         return data;
     }
 
-    static async loginWithSessionToken(token: string) {
+    static async loginWithSessionToken(token: string, useragent = ZncApi.useragent) {
         const uuid = uuidgen();
         const timestamp = '' + Math.floor(Date.now() / 1000);
 
@@ -120,9 +122,10 @@ export default class ZncApi {
         // Nintendo Account user data
         const user = await getNintendoAccountUser(nintendoAccountToken);
 
+        const id_token = nintendoAccountToken.id_token;
         const flapgdata = process.env.ZNCA_API_URL ?
-            await genfc(process.env.ZNCA_API_URL + '/f', nintendoAccountToken.id_token, timestamp, uuid, FlapgIid.NSO) :
-            await flapg(nintendoAccountToken.id_token, timestamp, uuid, FlapgIid.NSO);
+            await genfc(process.env.ZNCA_API_URL + '/f', id_token, timestamp, uuid, FlapgIid.NSO, useragent ?? undefined) :
+            await flapg(id_token, timestamp, uuid, FlapgIid.NSO, useragent ?? undefined);
 
         debug('Getting Nintendo Switch Online app token');
 
diff --git a/src/util.ts b/src/util.ts
index 5159b0a..65e1769 100644
--- a/src/util.ts
+++ b/src/util.ts
@@ -1,4 +1,5 @@
 import * as path from 'path';
+import * as fs from 'fs';
 import * as yargs from 'yargs';
 import type * as yargstypes from '../node_modules/@types/yargs/index.js';
 import createDebug from 'debug';
@@ -17,6 +18,17 @@ const debug = createDebug('cli');
 
 export const paths = getPaths('nxapi');
 
+export const dir = path.resolve(import.meta.url.substr(7), '..', '..');
+export const pkg = JSON.parse(fs.readFileSync(path.join(dir, 'package.json'), 'utf-8'));
+export const version = pkg.version;
+export const dev = (() => {
+    try {
+        fs.statSync(path.join(dir, '.git'));
+        return true;
+    } catch (err) {}
+    return false;
+})();
+
 export type YargsArguments<T extends yargs.Argv> = T extends yargs.Argv<infer R> ? R : any;
 export type Argv<T = {}> = yargs.Argv<T>;
 export type ArgumentsCamelCase<T = {}> = yargstypes.ArgumentsCamelCase<T>;