# Add rate limiting - Portal
In this guide we'll add simple Rate Limiting to a route. If you don't have one
ready, complete [Step 1](../setup-a-basic-gateway/index.mdx) first.
Rate Limiting is one of our most popular **policies** - you should never ship an
API without rate limiting because your customers or internal developers **will**
accidentally DoS your API; usually with a rogue `useEffect` call in React code.
:::info{title="What's a Policy?"}
[Policies](../../../articles/policies.mdx) are modules that can intercept and
transform an incoming request or outgoing response. Zuplo offers a wide range of
policies built-in (including rate limiting) to save you time. You can check out
[the full list](../../../policies/overview.mdx).
:::
Zuplo offers a programmable approach to rate limiting that allows you to vary
how rate limiting is applied for each customer, or requests.
In this example, we'll add a simple IP based rate limiter, but you should look
into dynamic rate limiting to see the full power of the world's best rate
limiter.
1. Add the rate-limiting Policy
Navigate to your route in the **Route Designer** (**Code** >
`routes.oas.json`), click the **Policies** dropdown, then click **Add
Policy** on the request pipeline.
Search for the rate limiting policy (not the "Complex" one) and click it.
By default, the policy will rate limit based on the caller's IP address (as
indicated by the `rateLimitBy` field). It will allow 2 requests
(`requestsAllowed`) every 1 minute (`timeWindowMinutes`). You can explore the
rest of the policy's documentation and configuration in the right panel.
To apply the policy, click **OK**. Then, save your changes to redeploy.
1. Testing your Policy
Now try firing some requests against your API. You should receive a **429 Too
many requests** on your 3rd request.
Your rate limiting policy is now intercepting excess requests, protecting the
echo API.