curl --request GET \
  --url 'https://api.stateset.com/api/v1/a2a/messages' \
  --header 'Authorization: Bearer YOUR_API_KEY'

[
  {
    "attempts": 1,
    "conversation_id": "string",
    "created_at": "string",
    "from_agent_id": "string",
    "id": "string",
    "message_type": "string",
    "sequence_number": 1,
    "status": "string",
    "to_agent_id": "string"
  }
]