API Gateway Setup for Businesses Exposing Multiple APIs
For businesses that have built or plan to build more than one API, we set up an API gateway as the single, secured entry point that handles authentication, rate limiting and routing for every one of them.
What an API Gateway Does
Once a business has more than one API, for a mobile app, a partner and an internal tool, say, managing authentication, throttling and logging separately for each one gets repetitive and inconsistent. A gateway sits in front of all of them as a single point that checks who is calling, how often, and routes the request to the right service behind it.
What a Gateway Adds
Centralised Authentication
Every API behind the gateway checks a caller's identity the same way, instead of each one implementing its own login logic differently.
Throttling Across Every API
Limits on how often each caller can make a request are enforced at the gateway, protecting the services behind it from being overwhelmed by one misbehaving client.
Request Routing and Versioning
Incoming requests are routed to the correct backend service and version, letting you change or replace what is behind the gateway without the caller noticing.
Centralised Logging and Monitoring
Every request passing through is logged in one place, so tracking down which caller triggered an error does not mean checking several separate systems.
When a Gateway Is Worth Setting Up
- You have, or are about to have, more than two or three APIs serving different callers
- Different partners or apps need different rate limits or access levels
- You want to retire or replace a backend service without breaking whoever calls it
- Security and audit requirements call for one place to review who accessed what
When It Is Not Needed Yet
- A single API with one known caller does not need a gateway in front of it
- If you are still deciding what your first API should expose, that comes before gateway setup, not alongside it
Frequently asked questions
Do we need an API gateway if we only have one API?
Usually not yet. A gateway earns its keep once you have several APIs or callers with different access needs. For a single API with one known caller, the gateway itself would add complexity without a clear benefit, and we would say so rather than sell you infrastructure you do not need.
Does a gateway replace the APIs behind it?
No. It sits in front of your existing or planned APIs and manages access to them; the APIs themselves still need to be built or already exist.
Can different partners get different access levels through the same gateway?
Yes, that is one of the main reasons to use one. Each caller's credentials can be scoped to specific endpoints, rate limits and data, all enforced at the gateway rather than repeated in every backend service.
What happens if a backend service goes down?
The gateway can be configured to return a clear error, route to a fallback, or queue the request depending on what that API is used for, rather than leaving the caller with a generic timeout.
What drives the cost of setting up a gateway?
How many services and callers it needs to manage from day one, whether custom rate-limiting or routing rules are needed beyond the defaults, and how much existing API traffic needs to be migrated behind it without downtime.
What sets the timeline for a gateway rollout?
Mainly how many existing APIs need to be brought behind the gateway without breaking current callers, since that migration has to be tested carefully rather than done all at once.
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