What is an API rate limit and why does it matter?
Most custom business software does not live on an island. It needs to talk to other tools. It might grab shipping updates from a courier website. It might sync customer details with your accounting platform. These tools talk to each other using rules called APIs.
To protect their own servers, these external services put a cap on how many times your software can ask for data. This cap is called a rate limit. If your app asks too many times in a minute, the other service will lock you out for a while.
When this happens, your software stops working properly. Data stops syncing. Your staff might see error messages on their screens. It is a frustrating problem that catches many business owners off guard after their new software goes live.
A real example of rate limits in action
Imagine you run a retail business in Melbourne with an online store and a physical shop. You build a custom app to update stock levels across both places every time an item sells.
On a quiet Tuesday, your app checks stock levels once every ten minutes. Everything runs smoothly. Nobody notices anything happening in the background.
Then a big weekend sale arrives. Suddenly, hundreds of customers buy items at the same time. Your custom software tries to check stock levels for every single sale right away. It sends five hundred requests to your supplier database in five seconds.
The supplier database sees this sudden rush as a cyber attack or a glitch. It blocks your app. Now your system cannot update stock at all, and your team has to fix orders by hand.
How to design your software around rate limits
You can avoid these headaches by planning for limits before writing any code. Your developer needs to know the rules of every external service your business relies on.
One good trick is caching. Instead of asking the external server for the same information all day, your app can save a copy locally and check it every few hours. This cuts down the number of requests massively.
Another method is queuing. If your app has lots of tasks to send out, it can hold them in a neat line and send them out slowly, one by one. This keeps you safely under the limit.
Always talk to your software developer about limits during the planning stage. Ask them what happens if an external service goes down or blocks your requests. A little planning saves a lot of stress later.
Good software starts with a clear understanding of the problem and keeps earning its place in the work that follows.
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