curl --request POST \
  --url https://api.anysite.io/api/usaspending/agencies \
  --header 'Content-Type: application/json' \
  --header 'access-token: <api-key>' \
  --data '
{
  "toptier_code": "<string>",
  "timeout": 300
}
'

[
  {
    "toptier_code": "<string>",
    "@type": "@usaspending_agency",
    "agency_id": 123,
    "name": "<string>",
    "abbreviation": "<string>",
    "mission": "<string>",
    "website": "<string>",
    "congressional_justification_url": "<string>",
    "icon_filename": "<string>",
    "about_agency_data": "<string>",
    "fiscal_year": 123,
    "subtier_agency_count": 0,
    "def_codes": [],
    "messages": []
  }
]