Guide

How to set up Slack uptime alerts

Your team lives in Slack. When your API goes down at 2 AM, the alert should show up where people will actually see it. Here's how to wire up uptime monitoring with Slack notifications in under 5 minutes.

STEP 1

Create a monitor

Sign up at app.larm.dev and create an HTTP monitor. Enter the URL you want to watch — your API health endpoint, your marketing site, your dashboard. Larm checks it from multiple global locations using multi-probe voting, so a single network hiccup won't trigger a false alert.

STEP 2

Connect Slack

Go to Alert Channels and add a Slack channel. Larm connects via OAuth — pick your workspace and channel from the dashboard. No webhook URLs to copy, no bot tokens to manage. Choose the channel your engineering team watches (or create a dedicated #alerts channel).

STEP 3

Attach the channel to your monitor

Link the Slack channel to your monitor. You can also set it as a default so every new monitor you create automatically sends alerts to Slack. When your service goes down — confirmed by multiple probe locations — Slack gets a formatted message with the monitor name, status, and error details.

STEP 4

Send a test alert

Hit "Test" on your Slack channel to verify it works before you need it. You'll see exactly what a real alert looks like in your channel. Better to test now than to find out your webhook expired during an actual outage.

Why not just use a simple webhook?

You could set up a cron job that curls your endpoint and posts to a Slack webhook. It would work — until the server running the cron job goes down too. Or until a DNS blip triggers a false alarm at 3 AM. Or until you need to monitor 10 endpoints instead of 1.

Larm checks from multiple locations across multiple continents. A probe failure in one region doesn't become your team's problem. You get confirmation windows that filter out brief blips, full request waterfall traces for debugging, and a status page that updates automatically. The Slack alert is just the notification layer on top of monitoring you can actually trust.

Slack alerts in under 5 minutes.

Free plan. 15 monitors. Multi-probe voting. No credit card.