What is API uptime monitoring?
API uptime monitoring checks whether your endpoints respond correctly from outside your infrastructure and alerts your team when availability or latency fails.
What API uptime monitoring measures
Scheduled probes call your API over the network and record HTTP status codes, response time, and whether the endpoint answers at all—similar to what clients and integrations experience.
Why external checks matter
Internal dashboards can show green while DNS, TLS, gateways, or regional routing fail for real callers. Synthetic checks from outside catch those blind spots.
What to monitor first
Start with login, health, payment, or sync endpoints that block revenue or core workflows. Add one monitor per critical URL before expanding coverage.
Uptime versus latency
A 200 response that takes too long can hurt users before a hard outage. Pair availability checks with response-time thresholds where slowness is a failure mode.
How alerts fit the workflow
Route failures to email, Telegram, or webhooks through alert contacts so the right person investigates—often before users open support tickets.
Where SitePuls fits
SitePuls HTTP and REST monitors cover scheduled API checks with incident history. For a step-by-step rollout, see the API monitoring checklist in the guides section.
Practical monitoring guide
Example content below is illustrative — values are placeholders, not live customer data.
What API uptime monitoring means
- Scheduled checks that your API endpoints return expected HTTP status codes from outside your infrastructure.
- Early warning when auth, health or core business paths fail before customers open tickets.
- A baseline view of availability separate from internal metrics that may miss edge routing issues.
What to monitor first
- A health or readiness endpoint that reflects whether the API can serve traffic.
- One write or read path that mirrors how integrations or mobile clients call you.
- Any dependency endpoint that recently caused downtime or degraded releases.
Example API uptime alert
API uptime check failed: GET /v2/health returned 502 after 8.4s
Next step
Add your first API monitor with the status code and interval your team agrees on, then route alerts to the channel that owns on-call for that service.
Frequently asked questions
What is API uptime monitoring?
It is scheduled external checking of API endpoints to confirm they respond correctly and alert your team when they do not.
How is it different from APM?
APM instruments code inside your services. Uptime monitoring proves what external callers observe on a schedule.
What should I check first?
Prioritize endpoints that gate sign-in, payments, sync, or other workflows your product cannot operate without.
Can SitePuls monitor authenticated APIs?
Yes. REST monitors can chain steps—for example token exchange followed by a protected resource—when auth matters.