Python Client & CLI for a Free Wallpaper API (NexWall)

nexwall is a tiny Python client and command-line tool for the NexWall free wallpaper API. List categories, search and page through wallpapers, grab a random wallpaper, download it, and change your desktop wallpaper every day on Windows, macOS or Linux. One dependency (requests) and two short modules you can read in a few minutes.

Step-by-step tutorial: Python wallpaper automation guide

Features

• Small client class covering every v1 endpoint: categories, wallpapers (paging, category, tag search, sort, type), category wallpapers, wallpaper by id
• random() helper: one request with sort=random
• download() streams the full-size image to a file or folder (the API key is never sent to the image host)
• Typed exceptions: AuthError (401), NotFoundError (404), ValidationError (422), RateLimitError (429, with retry_after)
• Tracks plan, remaining_requests_today and the X-RateLimit-* headers after each call
• CLI: nexwall categories | list | random | get, with --json output and --download
• Example script: daily desktop wallpaper changer for Windows, macOS, GNOME, KDE Plasma, XFCE, Cinnamon and feh
• Offline unit tests (mocked HTTP, no key needed)

What it does

$ nexwall categories
    5  Nature                      412 wallpapers
   ...

$ nexwall random --category 5 --download ./wall.jpg
   10234  3840x2160    Nature                https://...
Saved wall.jpg
[97 API requests left today, plan: free]

(The output above shows the format only; your categories, IDs and counts will differ.)

Quick start

1. Get a free API key

Sign up at https://nexwall.kodnextech.com/developers/register. The free plan needs no credit card.

2. Install and configure

Requires Python 3.9+.

git clone https://github.com/kodnextechnologies/nexwall-python.git
cd nexwall-python
pip install .            # or: pip install -e .  for development

Set your key as an environment variable (see .env.example; never commit it):

export NEXWALL_API_KEY=your_key_here          # macOS / Linux
setx NEXWALL_API_KEY your_key_here            # Windows (new terminals)
$env:NEXWALL_API_KEY = "your_key_here"        # Windows PowerShell (current session)

The package is not on PyPI yet. The pyproject.toml is ready for publishing as nexwall later; until then, install from source as shown above.

3. Run

nexwall categories
nexwall list --category 5 --sort popular --per-page 10
nexwall list --search mountains
nexwall random --category 5 --download ./wall.jpg
nexwall get 10234 --download ~/Pictures/
nexwall categories --json                  # raw JSON for scripting
python -m nexwall --help                   # works without installing the script

Exit codes: 0 success, 1 error, 2 rate limit reached.

Use it as a library

from nexwall import NexWallClient, RateLimitError

client = NexWallClient()                        # reads NEXWALL_API_KEY

for category in client.categories():
    print(category["id"], category["name"], category["wallpaper_count"])

page = client.wallpapers(category_id=5, sort="popular", per_page=20)
print(page["current_page"], "/", page["last_page"])

try:
    wallpaper = client.random(search="sunset")
    client.download(wallpaper, "downloads/")    # -> downloads/nexwall-<id>.jpg
except RateLimitError as e:
    print("Quota exceeded, retry in", e.retry_after, "seconds")

print(client.remaining_today, "requests left today")

Daily wallpaper changer

examples/daily_wallpaper.py downloads one random wallpaper to ~/Pictures/NexWall, sets it as your desktop background, and keeps the last 7 files. Each run uses one API request.

python examples/daily_wallpaper.py --category 5

Schedule it once a day:

• Windows (Task Scheduler)

  schtasks /create /tn "NexWall daily wallpaper" /sc daily /st 09:00 /tr "pythonw C:\path\to\nexwall-python\examples\daily_wallpaper.py"
  

  The task runs as you, so the NEXWALL_API_KEY you saved with setx is available.
• Linux (cron): crontab -e

  0 9 * * * NEXWALL_API_KEY=your_key DISPLAY=:0 DBUS_SESSION_BUS_ADDRESS=unix:path=/run/user/1000/bus /usr/bin/python3 /path/to/examples/daily_wallpaper.py
  

  DBUS_SESSION_BUS_ADDRESS is needed for gsettings from cron (replace 1000 with your user id from id -u).
• macOS (cron or launchd): same cron line without DISPLAY/DBUS_*. macOS asks once for permission to control "System Events".

Project structure

src/nexwall/
├── __init__.py          # public exports
├── client.py            # NexWallClient + exceptions
├── cli.py               # `nexwall` command
└── __main__.py          # python -m nexwall
examples/daily_wallpaper.py
tests/test_client.py     # after `pip install -e .`: python -m unittest discover -s tests
pyproject.toml
.env.example

API endpoints used

Base URL: https://nexwall.kodnextech.com/api/developer/v1

Every request sends Authorization: Bearer <API_KEY> and Accept: application/json.

Endpoint	Client method	CLI
GET /categories	categories()	nexwall categories
GET /wallpapers?page=&per_page=&category_id=&type=&search=&sort=	wallpapers(), random()	nexwall list, nexwall random
GET /categories/{categoryId}/wallpapers	category_wallpapers()
GET /wallpapers/{id}	wallpaper()	nexwall get

Parameters: per_page 1-100 (default 50); type is image or live (live requires Ultra); search is 2-100 characters and matches tags; sort is newest, oldest, popular or random.

Full reference: API docs · OpenAPI spec · Sandbox

Rate limits & plans

Plan	Price	Requests per day	Content
Free	Free, no credit card	100	Non-premium categories
Pro	₹399 / $4.99 per month	10,000
Ultra	₹899 / $10.99 per month	50,000	Includes live (video) wallpapers

• The free plan also allows up to 60 requests per minute.
• Responses include X-RateLimit-Limit, X-RateLimit-Remaining, X-RateLimit-Reset and X-Developer-Api-Plan (available as client.rate_limit), and the JSON body includes plan and remaining_requests_today (client.plan, client.remaining_today).
• On HTTP 429 the client raises RateLimitError with retry_after from the Retry-After header. The CLI prints the wait time and exits with code 2; the daily script keeps your current wallpaper.

Production note

On your own computer, an environment variable is fine. If you build a web app or service on top of this client, keep the key on the server only. Do not ship it in browser JavaScript or a mobile app; have your frontend call your backend, which uses NexWallClient, acting as a backend proxy. You can pass base_url= to point the client at a proxy of your own.

Related starters

• Flutter wallpaper app
• Android Kotlin wallpaper app (Jetpack Compose)
• React Native / Expo wallpaper app
• Web starter: Next.js / React, Laravel and plain JavaScript (API key kept server-side)

License

The source code is released under the MIT License.

Wallpaper images and videos returned by the API are not covered by the MIT license. Their use, including use as desktop backgrounds, is governed by the NexWall Developer API License.