API Monitoring
API monitoring is the automated, continuous checking of a REST or HTTP API to confirm it responds, returns the correct status code and delivers the expected content. MonitorUrs sends a request to your API URL at a configurable interval, validates each response, and alerts you instantly via Telegram, SMS and Email the moment a check fails.
Last updated: June 2026
Why API monitoring matters
APIs are the quiet backbone of modern software. Your website, mobile app, billing flow and third-party integrations all depend on endpoints returning the right data quickly. When an API stalls or starts returning errors, the failure cascades: pages fail to load, transactions break, and integrations silently drop data — often without any visible crash. Because an API has no front door for a human to glance at, these problems can run for hours before anyone notices.
API monitoring removes that blind spot. By calling your endpoints around the clock from outside your own infrastructure, MonitorUrs catches a bad status code, a missing field or a slow response the moment it appears and notifies you straight away. Instead of discovering a broken endpoint through a flood of support tickets, you hear about it in minutes and fix it before most users are affected.
How API monitoring works in MonitorUrs
You add your API as a probe — the endpoint URL you want to watch. MonitorUrs then runs that probe on a schedule and evaluates every response against the rules you define:
- Schedule: the probe runs on a configurable interval — every 15 minutes by default — so your endpoint is checked continuously without any manual effort.
- Request: MonitorUrs sends an HTTP GET request to your API URL and waits for the response, applying a request timeout of around 28 seconds so a hung endpoint is treated as a failure rather than blocking forever.
- Validate: the response is checked against one or more rules — the expected HTTP status code, whether a keyword or value is present in the body, or whether an error string is absent.
- Decide: if every rule passes the probe is healthy; if any rule fails, a consecutive-failure counter increments.
- Alert: once consecutive failures reach the threshold you set, MonitorUrs sends alerts to your contacts and marks the probe as down.
- Recover: when the API responds correctly again, the probe returns to healthy and a recovery notification is sent automatically.
Because each probe is just a URL plus a set of validation rules, monitoring a public REST endpoint, a health-check route or a JSON feed takes only a minute to set up.
What gets validated on each call
A bare "did it respond?" check is not enough — an API can return a 200 OK while serving an empty payload or an error wrapped in a success envelope. MonitorUrs records detailed data on every call and lets you validate the response in several ways:
| Check / metric | What it tells you |
|---|---|
| HTTP status code | Confirms the endpoint returned the expected code (for example 200), catching 4xx client errors and 5xx server errors. |
| Keyword present | Verifies that an expected value or field name (such as "status":"ok") actually appears in the response body. |
| Keyword absent | Confirms an error string (such as "error" or "Service Unavailable") is not present in the response. |
| Response time (ms) | Measures how long the call took, so you can track API performance and spot slowdowns. |
| Response body length | Records the size of the returned body to help detect truncated, empty or unexpectedly large payloads. |
Checks use an HTTP GET request, and content validation works on the raw response body: you choose a piece of text that must appear (to confirm the right JSON field or value is present) and, separately, text that must never appear (to catch error responses). This keyword-based approach is fast to configure and catches the failures that a status-code-only check would miss.
Instant alerts on every channel
Detecting a broken endpoint is only useful if the right people hear about it fast. MonitorUrs delivers alerts through three channels so a notification always reaches you:
- Telegram alerts — instant messages to a person or team channel through the MonitorUrs bot.
- SMS alerts — text messages for the most critical, can't-miss incidents.
- Email alerts — detailed notifications with retry and bounce handling so they get through.
Alerts only fire after the consecutive-failure threshold you configure is reached, which filters out one-off network blips and prevents noisy false alarms. When the API recovers, an automatic recovery message closes the loop.
Common use cases
- Public REST APIs — make sure the endpoints your customers and partners depend on stay online and return valid data.
- Health-check routes — watch a dedicated
/healthor/statusendpoint that reflects whether your service is fully operational. - Third-party integrations — keep an eye on the external APIs your product relies on, so you know when a vendor — not you — is the cause of a problem.
- JSON feeds and webhooks targets — confirm that a feed keeps serving the expected fields and never starts returning an error payload.
How it fits the bigger picture
API monitoring is one piece of a complete monitoring strategy. It works hand in hand with website monitoring for the pages those APIs power, HTTP endpoint monitoring for any URL you want to watch, and response-time monitoring for performance trends. Availability data rolls up into uptime monitoring, and every check feeds your incident history — giving you both the immediate alert and the long-term record in one platform.
Frequently asked questions
What is API monitoring?
API monitoring is the automated checking of an API at regular intervals to confirm it responds, returns the right status code and delivers the expected content. MonitorUrs sends an HTTP request to your API URL, validates the response and alerts you the moment a check fails.
How often does MonitorUrs check my API?
Each API probe runs on a configurable interval. The default is every 15 minutes, and you can set a shorter or longer interval per probe depending on how critical the endpoint is.
Can MonitorUrs check the content of an API response?
Yes. Beyond checking the HTTP status code, each probe can verify that a specific keyword or value is present in the response body, or confirm that an error string is absent, so you can be sure the expected JSON field or value actually appears.
Does API monitoring track response time?
Yes. Every check records the response time in milliseconds along with the HTTP status code and the length of the response body, so you can track API performance trends and spot slowdowns before they turn into outages.
What request method does MonitorUrs use to check an API?
API probes use an HTTP GET request to the endpoint URL you provide, with a request timeout of around 28 seconds so a hung endpoint is treated as a failure rather than waiting indefinitely.
How will I be notified when my API goes down?
MonitorUrs sends instant alerts through Telegram, SMS and Email. Alerts fire after a configurable number of consecutive failed checks, and a recovery alert is sent automatically when the API responds correctly again.