curl -X POST 'https://crypto-api.yativo.com/api/v1/card-issuer/master-wallets/swap' \
  -H 'Authorization: Bearer YOUR_ACCESS_TOKEN' \
  -H 'Content-Type: application/json' \
  -d '{
    "from_token": "USDC",
    "to_token": "EUR",
    "amount": 1000
  }'

{
  "success": true,
  "message": "Swap initiated: 1000 USD → EUR",
  "data": {
    "swap_id": "0x7a8b9c1d2e3f4a5b6c7d8e9f0a1b2c3d4e5f6a7b8c9d0e1f2a3b4c5d6e7f8a9b0c1d2e3f",
    "status": "submitted",
    "from_token": "USD",
    "to_token": "EUR",
    "amount": 1000,
    "expected_output": 924.50,
    "fee_amount": "1.20",
    "estimated_time": "1-5 minutes"
  }
}