curl --request GET \
  --url https://api.portalhq.io/api/v3/custodians/me/gas-sponsorship/chains \
  --header 'Authorization: Bearer <token>'

[
  {
    "chainId": "eip155:11155111",
    "currentPeriod": {
      "maxGasAllowanceLimit": "499",
      "gasUsage": "0.35080714673101143",
      "endsAt": "2026-02-13T17:49:43.000Z"
    }
  },
  {
    "chainId": "solana:EtWTRABZaYq6iMfeYKouRu166VU2xqa1",
    "currentPeriod": {
      "maxGasAllowanceLimit": "5",
      "gasUsage": "0.0053",
      "endsAt": "2026-02-13T17:49:43.000Z"
    }
  }
]