curl -X GET 'https://crypto-api.yativo.com/api/v1/card-issuer/master-wallets' \
  -H 'Authorization: Bearer YOUR_ACCESS_TOKEN'

{
  "success": true,
  "data": {
    "wallets": {
      "sol": {
        "address": "SoLMasterWalletAddressXXXXXXXXXXXXXXXXXXXXXXXX",
        "balance": 12450.50,
        "last_balance_check": "2026-04-01T11:55:00.000Z"
      },
      "xdc": {
        "address": "0xXDCMasterWalletAddress",
        "balance": 3200.00,
        "last_balance_check": "2026-04-01T11:55:00.000Z"
      },
      "usdc": { "balance": 8340.00, "last_balance_check": "2026-04-01T11:55:00.000Z" },
      "eur":  { "balance": 3100.00, "last_balance_check": "2026-04-01T11:55:00.000Z" },
      "gbp":  { "balance": 1200.00, "last_balance_check": "2026-04-01T11:55:00.000Z" }
    }
  }
}