> ## Documentation Index
> Fetch the complete documentation index at: https://docs.li.fi/llms.txt
> Use this file to discover all available pages before exploring further.

# Authentication

Our API does not require any authentication to be used. However, if your application requires higher rate limits you can request an API key via our partners support system.

Once you have your key you can authenticate all your requests by attaching it in the x-lifi-api-key header:

```cURL cURL theme={"system"}
curl --location 'https://li.quest/v1/quote?fromChain=100&fromAmount=1000000&fromToken=0x4ecaba5870353805a9f068101a40e0f32ed605c6&fromAddress=0x552008c0f6870c2f77e5cC1d2eb9bdff03e30Ea0&toChain=137&toToken=0x2791bca1f2de4661ed88a30c99a7a9449aa84174&slippage=0.03' \
--header 'x-lifi-api-key: YOUR_CUSTOM_KEY'
```