curl --request GET \
  --url https://api.cryptorank.io/v3/blockchains/map \
  --header 'X-Api-Key: <api-key>'

{
  "data": [
    {
      "id": 3,
      "slug": "ethereum",
      "name": "Ethereum"
    }
  ],
  "status": {
    "usedCredits": 1,
    "timestamp": 1780000000000
  }
}