Key KPIs for APIs 2017-09-21T09:59:14+00:00

KPIs for APIs

There are multiple options for measuring Key Performance Indicators with API transactions.

Total API Call Latency
TCP Connect TIme
Measured Pass Rate
Actual Passrate

Critical KPIs

There are lots of things that can be measured with an API which include:

  • Pass Rate
  • Latency
  • Overall Service Quality
  • Geographic Performance

The challenge is there are multiple ways to measure these and the impact they may have on your services.

Why not have a demonstration of what we can monitor?

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Pass Rate

The pass rate is the actual measured success rate for an API call from a specific location. However, it’s possible that APIs may pass at different rates from different locations. It is also important to validate the content being returned, don’t just assumed that HTTP-200 means ‘All OK’.

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KPI SLA and Pass Rate

Effective Pass Rate

You may have a 100% pass rate, but there may be events and performance issues which cause timeouts and other problems. You need to take into account the performance including latencies and items that may affect end users.


Latency is complex for APIs which is why using a common ‘ping’ style type tool won’t tell you what you need to know. ¬†API calls include multiple steps:

  • Connect Time
  • DNS Look Up
  • Server Side Processing Time
  • Internet travel time
  • Total call time

Each of these vary by geography, so careful analysis is required to take these into account.

API Location KPI