> ## Documentation Index
> Fetch the complete documentation index at: https://docs.0xradar.app/llms.txt
> Use this file to discover all available pages before exploring further.

# Quickstart

> Make your first 0xRadar API call in under 5 minutes

# Quickstart

This guide walks you through your first API call: fetching the token balances of Vitalik's wallet on Ethereum.

## Prerequisites

* A 0xRadar API key ([get one here](/getting-started/authentication))
* `curl`, Python 3.8+, or Node.js 18+

## Step 1: Pick a wallet

We'll use a well-known address for this example:

```
0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045
```

## Step 2: Make the request

<CodeGroup>
  ```bash cURL theme={null}
  curl -X GET "https://api.0xradar.app/v1/wallet/0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045/balances?chain=ethereum&max_tokens=5" \
    -H "X-API-Key: YOUR_API_KEY"
  ```

  ```python Python theme={null}
  import httpx

  url = "https://api.0xradar.app/v1/wallet/0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045/balances"
  params = {"chain": "ethereum", "max_tokens": 5}
  headers = {"X-API-Key": "YOUR_API_KEY"}

  response = httpx.get(url, params=params, headers=headers)
  data = response.json()
  print(data)
  ```

  ```javascript JavaScript theme={null}
  const url = new URL("https://api.0xradar.app/v1/wallet/0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045/balances");
  url.searchParams.set("chain", "ethereum");
  url.searchParams.set("max_tokens", "5");

  const res = await fetch(url, {
    headers: { "X-API-Key": "YOUR_API_KEY" }
  });
  const data = await res.json();
  console.log(data);
  ```
</CodeGroup>

## Step 3: Multi-chain portfolio

```bash theme={null}
curl -H "X-API-Key: YOUR_API_KEY" \
  "https://api.0xradar.app/v1/wallet/0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045/portfolio?chains=ethereum,base,arbitrum"
```

## What's next?

* Read the [Authentication](/getting-started/authentication) guide
* Explore the [API Reference](/api/health)
* Check [Rate Limits](/getting-started/rate-limits) before production load