curl --request POST \
  --url https://api.ondoperps.xyz/v1/auth/erc-4361/login/get_challenge \
  --header 'Content-Type: application/json' \
  --data '
{
  "walletAddress": "0x742d35Cc6634C0532925a3b844Bc9e7595f2bD18",
  "chainId": "1"
}
'

{
  "success": true,
  "result": {
    "id": "chg_9f8e7d6c5b4a3210",
    "message": "api.ondoperps.xyz wants you to sign in with your Ethereum account:\n0x742d35Cc6634C0532925a3b844Bc9e7595f2bD18\n\nSign in to Ondo Perps\n\nURI: https://api.ondoperps.xyz\nVersion: 1\nChain ID: 1\nNonce: abc123\nIssued At: 2025-03-05T14:30:00Z"
  }
}