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Slack alerts
when your
API endpoint fails

We monitor your API endpoints continuouslyYour team gets instant Slack alerts when APIs break

Free 14-day trial · No credit card required

Trusted by thousands of businesses

Setup Slack alerts for API endpoint failures in seconds

OnlineOrNot continuously monitors your API endpoints from multiple locations worldwide. The moment your APIs start returning errors or become unresponsive, your team will receive instant Slack notifications with detailed error information so you can collaborate and take action immediately.

Keep your entire development team in the loop with real-time API status alerts delivered directly to your Slack workspace.

Try OnlineOrNot now!

How to get Slack alerts when your API endpoints fail:

Step 1

Sign up for free

Create your OnlineOrNot account in less than 30 seconds. No credit card required to get started monitoring your APIs.

Step 2

Connect your Slack workspace

Integrate OnlineOrNot with your Slack workspace using our simple one-click setup. Choose which channels should receive API failure alerts for different endpoints.

Step 3

Add your API endpoints and configure alerts

Enter your API endpoint URLs, customize monitoring settings including HTTP methods and headers, and set up Slack notification preferences. Your team will be instantly notified when API issues occur.

No credit card required.

Frequently asked questions

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Trusted by software teams worldwide

OnlineOrNot is built for scale and runs millions of uptime checks every week. Thousands of software teams, including some of the world's leading brands have already made the switch from other uptime monitors.

Uptime Checks last week: 11.8M
Users: 4,164
Detected incidents last week: 775

- OnlineOrNot has been absolutely fantastic for my bot, Noti. It completely transformed the way I monitor online services.
  The real-time notifications keep me in the loop about any downtime, allowing me to take immediate action. If you're looking for a reliable way to monitor your project's status, I highly suggest using OnlineOrNot.
  Adam H
  Maker of Noti
- Bet on indie hackers 🚀
  I tried @RozenMD's OnlineOrNot uptime monitoring, and for a few days got notifications of 2min down time.
  I thought that OnlineOrNot was wrong as Uptime Robot wasn't reporting anything.
  Turns out it was the other way around.
  Khaled Bentoumi
  Founder of Data to Page
- We've been using OnlineOrNot and it has been a life saver.
  It, by far, has been one of the most responsive uptime services we've tried and it only gets better and better as time goes on.
  Alex Bowles
  Founder of Casterlabs
- I just set up some site aliveness checks for @Archium_io with @RozenMD's OnlineOrNot.
  Took me less than five minutes and it was completely self-explanatory, not to mention gorgeous. Seriously good experience.
  Great job, Max! 👏👏
  Graham Lea
  Founder of Archium.io
- OnlineOrNot by @RozenMD is all one needs
  It is easy to set up and very reliable. I have been using it for almost an year now.
  Rajat Saxena
  Founder of CourseLit
- I'm using OnlineOrNot to monitor my @cloakist customers' sites, so I can respond quickly if they stop working
  Love it. Super clean interface, very intuitive. Particularly impressed at how it can wait for full page load
  Thanks @RozenMD for making this awesome tool!
  Louis Barclay
  Founder of Cloakist
- OnlineOrNot does the job for me.
  Charles Miller
  Software Architect at Atlassian