Sometimes you just need a URL to be called at a certain time. Maybe your app has a page that sends out email digests when you open it. Or an endpoint that pulls fresh data from another service. Or a WordPress address that processes scheduled posts. The task itself is simple, but someone (or something) needs to actually visit that URL on time.
If you have your own server, you'd set up a cron job. But if you don't, or you'd rather not touch the command line, there are online services that do exactly this: you give them a URL, pick a time or a repeating schedule, and they send the request for you. No server, no code, no terminal.
Below is a look at how this works, what you can do with it, and what most people miss when setting it up.
What "scheduling an HTTP request" actually means
When you type a website address into your browser and hit Enter, your browser sends what's called an HTTP request to that address. The server behind the URL receives it, does whatever it needs to do, and sends back a response (usually the web page you see).
Scheduling an HTTP request means having a service do that same thing automatically, at a time you choose. Instead of you opening the URL manually, the service opens it for you. Every day at 3 AM, every hour, every 5 minutes, once next Tuesday at noon.
The URL doesn't have to show a web page. It can be an API endpoint that triggers a backup, a webhook that starts a payment sync, or a script that cleans up old files. As long as the address is reachable from the internet, a scheduling service can call it.
Why not just do it yourself?
You could set a reminder on your phone and open the URL manually. That works exactly once before you forget, sleep through it, or go on vacation.
A script on your computer that runs on a timer is another option. That works until your laptop goes to sleep, your internet drops, or you close the terminal by accident.
Setting up a cron job on a Linux server is the traditional approach, and it's reliable. But it means having a server, knowing how to connect to it, and writing cron syntax. For a lot of people, that's overkill for what amounts to "open this URL every 5 minutes."
Online scheduling services exist specifically for this. You paste a URL, pick a schedule, and walk away. The service runs on infrastructure you don't have to think about.
Simple GET requests: just open this URL on a timer
The most common case is the simplest one. You have a URL, and you want it called on a regular schedule. No special data to send, no headers, no authentication. Just open the address, let the server do its thing.
WordPress sites use this all the time. WordPress has a built-in scheduler that only works when someone visits the site. On quiet sites, scheduled posts publish late, backups never run, and plugin tasks pile up. An external service that calls wp-cron.php every 5 minutes fixes all of that. We wrote a step-by-step guide for that specific setup.
Another common one: keeping free-tier apps awake. Platforms like Render, Railway, and Fly.io put free apps to sleep after 15 minutes without visitors. A scheduled GET request to your app's homepage every 10 minutes keeps it running. Not pretty, but effective.
For these simple cases, any scheduling service works. There are free tools like cron-job.org and FastCron that handle basic GET requests fine. The difference shows up when you need more than just "fire and forget."
POST requests, headers, and API calls
Not every scheduled task is as simple as opening a URL. Some APIs expect you to send data with the request.
Slack incoming webhooks, for instance, need a POST request with a JSON body that contains the message text. Schedule that POST for 9 AM every Monday with a weekly summary, and you've got automated team updates without writing a bot. Payment APIs for nightly reconciliation might expect specific headers (like an API key) along with a POST body. Data syncs between services often need authentication tokens passed in headers.
This is where most free tools fall short. They handle GET requests fine but have limited or no support for POST bodies, custom headers, or authentication.
WatchCron's webhook scheduler was built for exactly this. You pick the HTTP method (GET, POST, PUT, DELETE), add any headers you need (like Authorization: Bearer your-api-key), include a request body if the API expects one, and set the schedule. Every call gets logged with the full request and response, so you can see exactly what was sent and what came back.
The setup takes about two minutes
Whether you're scheduling a simple GET or a POST with custom headers, the process is quick:
1. Create a free account (no credit card needed).
2. Add a new Cloud Cron task. Paste the URL you want to call.
3. Pick the request method. GET works for most cases. Use POST if you need to send data.
4. Set the schedule. You can pick from presets (every 5 minutes, every hour, daily at midnight) or enter a cron expression. Never written one? The cron expression builder lets you put one together visually.
5. Save. Your URL starts getting called on that schedule.
That's it. The free plan includes 3 scheduled tasks with 1-minute minimum intervals. For most setups (a WordPress cron trigger, a nightly API call, a keep-alive ping), three tasks is enough.
What makes this different from a basic cron service
There are plenty of services that call a URL on a schedule. cron-job.org does it for free, FastCron offers 15 free jobs, EasyCron has been around for years. They all work for the basic "hit this URL" use case.
The gap is what happens after the request is sent. Most services check the HTTP status code and that's it. If your URL returns "200 OK" but the code behind it crashed, threw an error, or processed zero records, they report success. You find out something's wrong when a customer complains or when you manually check.
WatchCron records the full result of every scheduled request: the status code, how long it took, and the actual content that came back. If the status changes from 200 to 500, if response time doubles, or if the response body changes unexpectedly, you get an alert through Slack, Telegram, Discord, or email.
That matters most for business-critical tasks. A nightly billing sync that silently stops processing payments. A data feed that returns empty results instead of crashing. An API call that starts timing out because the remote server is overloaded. These are the failures that don't trigger a "500 error" email but still break things.
For a deeper comparison of all the services out there, the online cron services comparison covers pricing, features, and limits for every major provider.
Recurring vs. one-time: pick the right schedule
Most scheduled requests are recurring. Call this URL every hour, every day, every Monday morning. That's the standard setup, and every scheduling service handles it.
But sometimes you need a single request at a specific time. Fire a webhook next Thursday at 9 AM. Trigger a deployment at midnight on release day. Send a reminder 30 minutes from now. For one-time requests, fewer options exist. Services like Beew.io support this natively. With recurring services, you'd create the job, let it fire once, then delete it manually.
For recurring schedules, the main question is how often. Some free services limit you to every 20 minutes or once per hour. WatchCron's Cloud Cron goes down to every minute, which matters for time-sensitive tasks like WordPress cron triggers or health-check pings.
If you're not sure which cron expression matches your schedule, the cron jobs guide explains the five-field format from scratch, and the expression builder lets you test it before committing.