curl --request GET \
  --url https://tonapi.io/v2/nfts/collections

{
  "nft_collections": [
    {
      "address": "0:FD595F36B4C1535BEC8461490D38EBB9AE3C38DD6ACE17CA63ABE2C6608BE159",
      "next_item_index": 1,
      "raw_collection_content": "<string>",
      "approved_by": [
        "getgems"
      ],
      "trust": "whitelist",
      "owner": {
        "address": "0:10C1073837B93FDAAD594284CE8B8EFF7B9CF25427440EB2FC682762E1471365",
        "is_scam": true,
        "is_wallet": true,
        "name": "Ton foundation",
        "icon": "https://ton.org/logo.png"
      },
      "metadata": {},
      "previews": [
        {
          "resolution": "100x100",
          "url": "https://site.com/pic1.jpg"
        }
      ],
      "metadata_status": {
        "url": "<string>",
        "is_broken": true,
        "last_refresh_try": 123,
        "last_refresh_success": 123
      }
    }
  ]
}

{
  "error": "<string>",
  "error_code": 123,
  "details": {
    "required": 123,
    "available": 123
  }
}