> ## Documentation Index
> Fetch the complete documentation index at: https://help.datafetcher.com/llms.txt
> Use this file to discover all available pages before exploring further.
# Set request parameters
Query parameters are key-value pairs added to URLs that help modify what data an API returns. They appear after a question mark in the URL, like `?ticker=IBM&includePrices=true`. Many APIs use parameters to filter results, specify data formats, or control response details.
You can add parameters in two ways: manually type them directly into the **URL** input field, or use the **Parameters** tab for easier management and automatic URL formatting.
### Before you begin
Make sure you've entered the complete API base URL and endpoint path in the **URL** input field. For example:
```
https://api.coingecko.com/api/v3/coins/markets
```
## How to manage query parameters
### Add a query parameter
1. On the custom request screen, click the **Parameters** tab.
2. Click **+ Add** to create a new parameter.
3. Enter the parameter name in the left input field and its corresponding value in the right input field.
4. The parameter will automatically be added to your **URL** with proper formatting.
5. Use the **+** icon next to the value field to insert table values from your Airtable base into the parameter.
6. Repeat steps 2-5 to add additional parameters as needed.
### Remove a query parameter
1. On the custom request screen, click the **Parameters** tab.
2. Find the parameter you want to remove.
3. Click the **-** button next to that parameter to delete it.
4. The parameter will automatically be removed from your **URL**.
Reference Airtable values in parameters by clicking the **+** icon located on the
right-hand side of an input.