Look up UN 1203
This one needs no key. Try it from your terminal.
curl "https://api.app.transportial.com/api/adr/un-numbers?search=1203&max=1"{
"success": true,
"adrUnNumbers": [
{
"unNumber": "1203",
"name": "MOTOR SPIRIT or GASOLINE or PETROL",
"adrClass": "3",
"classificationCode": "F1",
"packingGroup": "II",
"dangerLabels": "3",
"limitedQuantities": "1 L",
"transportCategory": "2",
"tunnelCode": "D/E",
"hazardIdentificationNumber": "33",
"carriageRestrictions": "Carriage in BULK is not permitted"
}
],
"totalResults": 1
}Trimmed to the main fields.