curl --request GET \
  --url https://example.com/api/validator/v0/scan-proxy/unclaimed-development-fund-coupons

{
  "unclaimed-development-fund-coupons": [
    {
      "contract": {
        "template_id": "<string>",
        "contract_id": "<string>",
        "payload": {},
        "created_event_blob": "<string>",
        "created_at": "<string>"
      },
      "domain_id": "<string>"
    }
  ]
}