curl --request POST \
  --url https://api.anchorage-staging.com/v2/vesting/balances \
  --header 'Api-Access-Key: <api-key>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "allocationIds": [
    "<string>"
  ],
  "stakeholderId": "<string>"
}
'

{
  "errorCount": 1,
  "results": [
    {
      "allocationId": "alloc-123",
      "balance": {
        "assetType": "BTC",
        "availableBalance": "1000.50000000",
        "externalTokenId": "magna_token_123",
        "lockedBalance": "100.10000000",
        "networkId": "ETHHOODI",
        "unvestedBalance": "500.25000000"
      },
      "error": "<string>",
      "walletInfo": {
        "address": "0x1234567890abcdef...",
        "walletId": "3d293c0d64c703023692216e9b4f5280"
      }
    }
  ],
  "successCount": 3
}