Creative subtypes (audio and video) value 2 means VAST 2.0
VAST 2.0 inline documents, still a common baseline for web players.
When to send it
Send 2 when the player can parse VAST 2.0 inline responses. VAST 2.0 gave companion and non-linear ads a structured form, and many players still treat it as the oldest version they accept. The sample video request in the OpenRTB 2.6 document lists 2 and 3.
Buyers serving older or simpler tags rely on 2 being present. It pairs with 5 (VAST 2.0 Wrapper). Problems come from a seller that lists 2 but not 5 and then rejects every wrapped response, or from a bidder that puts 2 in Bid.protocol for a document whose root declares version 3.0.
Example
{
"imp": [
{
"audio": {
"protocols": [
2
]
}
}
]
}Fields that carry it
Other values in creative subtypes (audio and video)
| Value | Name |
|---|---|
1 | VAST 1.0 |
3 | VAST 3.0 |
4 | VAST 1.0 Wrapper |
5 | VAST 2.0 Wrapper |
6 | VAST 3.0 Wrapper |
7 | VAST 4.0 |
8 | VAST 4.0 Wrapper |
9 | DAAST 1.0 |
10 | DAAST 1.0 Wrapper |
11 | VAST 4.1 |
12 | VAST 4.1 Wrapper |
13 | VAST 4.2 |
14 | VAST 4.2 Wrapper |
15 | VAST 4.3 |
16 | VAST 4.3 Wrapper |
The creative subtypes (audio and video) list page explains the whole list and its common mistakes.