curl --request GET \
  --url https://api.blockradar.co/v1/rewards/supported-chains \
  --header 'x-api-key: <api-key>'

{
  "message": "Supported reward chains retrieved successfully",
  "statusCode": 200,
  "data": {
    "all": [
      "ethereum",
      "base",
      "arbitrum",
      "optimism",
      "polygon"
    ],
    "byType": {
      "regulated": [
        "ethereum"
      ],
      "defi": [
        "ethereum",
        "base",
        "arbitrum",
        "optimism",
        "polygon"
      ]
    }
  }
}