getAssetsByGroup

curl https://fra.rpc.orbitflare.com?api_key=YOUR-API-KEY -X POST -H "Content-Type: application/json" -d '{
  "jsonrpc": "2.0",
  "id": 1,
  "method": "getAssetsByGroup",
  "params": {
    "groupKey": "collection",
    "groupValue": "J1S9H3QjnRtBbbuD4HjPV6RpRhwuk4zKbxsnCHuTgh9w",
    "page": 1,
    "limit": 1
  }
}'

{
  "jsonrpc": "2.0",
  "result": {
    "last_indexed_slot": 457714577,
    "total": 1,
    "limit": 1,
    "page": 1,
    "items": [
      {
        "interface": "ProgrammableNFT",
        "id": "JEGruwYE13mhX2wi2MGrPmeLiVyZtbBptmVy9vG3pXRC",
        "content": {
          "json_uri": "https://madlads.s3.us-west-2.amazonaws.com/json/6867.json",
          "metadata": { "name": "Mad Lads #6867", "symbol": "MAD" }
        },
        "grouping": [
          { "group_key": "collection", "group_value": "J1S9H3QjnRtBbbuD4HjPV6RpRhwuk4zKbxsnCHuTgh9w" }
        ],
        "ownership": {
          "frozen": true,
          "delegated": true,
          "delegate": "FARqKAafAbgT25QcgiX5d1g6xpadgG7xymu5N6gSmp4x",
          "ownership_model": "single",
          "owner": "CxBhuJwhVgNMc7yjnRx3XFAsTnnbYDc2bhAGSaLBjNqZ"
        }
      }
    ]
  },
  "id": 1
}

const RPC_URL = 'https://fra.rpc.orbitflare.com?api_key=YOUR-API-KEY';

async function getCollectionHolders(collection: string) {
  const holders = new Map<string, number>();
  let cursor: string | undefined;

  while (true) {
    const response = await fetch(RPC_URL, {
      method: 'POST',
      headers: { 'Content-Type': 'application/json' },
      body: JSON.stringify({
        jsonrpc: '2.0',
        id: 1,
        method: 'getAssetsByGroup',
        params: { groupKey: 'collection', groupValue: collection, limit: 1000, cursor },
      }),
    });
    const { result, error } = await response.json();
    if (error) throw new Error(error.message);

    for (const asset of result.items) {
      const owner = asset.ownership.owner;
      holders.set(owner, (holders.get(owner) ?? 0) + 1);
    }
    if (result.items.length < 1000) break;
    cursor = result.cursor;
  }

  return holders;
}