How do I set up uptime checks for a public API from multiple regions?

To set up uptime checks for a public API from multiple regions, you want two things:

1. Regular health probes from geographically distributed locations
2. Alerting when one region fails or overall availability drops

Here’s a practical way to do it.

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1) Decide what “healthy” means

For an API, don’t just check GET /. Define a lightweight endpoint such as:

• GET /health
• GET /ready
• GET /status

It should return quickly and verify only what matters for availability, for example:

• app is running
• dependencies needed for serving requests are reachable
• auth layer is functioning if relevant

Typical response:

• HTTP 200
• small JSON body like { "ok": true }

Avoid making the health check too expensive or dependent on slow downstream systems unless that’s truly required.

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2) Choose a multi-region monitoring provider or platform

You can do this with:

Managed uptime monitoring

Good if you want speed and reliability:

• Pingdom
• UptimeRobot
• StatusCake
• Datadog Synthetics
• New Relic Synthetics
• Better Stack
• AWS CloudWatch Synthetics

Many of these let you choose probe locations like:

• US East
• US West
• Europe
• Asia-Pacific

DIY with cloud regions

Good if you want control:

• Deploy small cron jobs or Lambdas in multiple regions
• Have them call the API and report results to a central system

Examples:

• AWS Lambda in us-east-1, eu-west-1, ap-southeast-1
• GCP Cloud Run jobs in multiple regions
• Azure Functions in multiple regions

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3) Configure checks from several regions

Set up one check per region, all hitting the same endpoint.

Example configuration:

• us-east-1 → https://api.example.com/health
• eu-west-1 → https://api.example.com/health
• ap-southeast-1 → https://api.example.com/health

Recommended check settings:

• Interval: every 1–5 minutes
• Timeout: 2–5 seconds
• Retries: 1–2 before alerting
• Expected status: 200
• Optional validation: response body contains "ok": true

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4) Add checks for latency and error rate

Availability alone isn’t always enough. Add:

• Response time checks per region
• HTTP status code monitoring
• DNS resolution checks
• TLS certificate expiration checks
• Synthetic transaction checks if the API has authentication or key endpoints

This helps catch regional slowdowns before total failure.

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5) Alert intelligently

Don’t alert on a single region blip if the API is still globally reachable.

Good alert patterns:

• Single region down for > 2 checks → warning
• 2+ regions failing → critical
• All regions failing → incident

This reduces false positives caused by local network issues.

Alert channels:

• PagerDuty
• Slack
• Email
• Opsgenie
• SMS for critical incidents

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6) Store and visualize results

Track:

• uptime percentage by region
• latency by region
• failure counts
• time to recovery

A dashboard can show:

• map or list of probe regions
• success/failure history
• p95 latency per region
• incident timeline

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7) Example implementation options

Option A: Managed service

1. Create a monitor
2. Add 3+ probe locations
3. Set interval to 1 minute
4. Set timeout to 5 seconds
5. Alert on 2 consecutive failures
6. Send alerts to Slack/PagerDuty

Option B: DIY with cron + API call

Run a small script in each region:

curl -fsS --max-time 5 https://api.example.com/health

If it fails, publish an event to monitoring/alerting.

Option C: Cloud synthetic checks

Use a synthetic probe service or serverless function in each region and centralize logs/metrics in one place.

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8) Best practices

• Use a dedicated health endpoint
• Keep the check fast and cheap
• Use multiple regions and multiple providers if the API is mission-critical
• Test from regions where your users are located
• Avoid alerting on one-off failures
• Validate both availability and latency
• Make sure checks do not require interactive login unless that’s intended

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9) If you want a simple starting setup

A solid baseline:

• 3 regions: US, EU, APAC
• 1-minute interval
• 3-second timeout
• Alert after 2 consecutive failures in the same region
• Critical if 2 regions fail at once
• Dashboard with per-region uptime and latency

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If you want, I can also give you:

• a Terraform example
• a Python script for multi-region uptime checks
• a cloud-specific setup for AWS, GCP, or Azure