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adagents.json declares which sales agents are authorized for a domain’s properties; the core OpenRTB 2.3 Imp object describes an impression offered in an auction. It has no standard field for the AdCP authorization selector. The two therefore handle different layers: AdCP establishes agent-level inventory scope, while OpenRTB describes and auctions individual impressions.
What does adagents.json authorize?
A publisher hosts adagents.json at /.well-known/adagents.json on its domain. The file declares properties and the sales agents authorized to sell them. In the current AdCP overview’s v3-style example, an authorization entry includes an authorization_type and a corresponding selector such as property_ids. The type alone does not identify the scope: a resolver needs the matching selector to determine which properties the authorization covers. See the AdCP adagents.json overview.
This is an authorization declaration at the agent-and-property level. It is not an impression description, nor does it by itself specify the floor, media format, or other auction details for a particular opportunity.
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In the IAB’s OpenRTB 2.3 specification, a BidRequest contains one or more Imp objects. Each Imp represents an offered impression or ad placement and describes auction-related details such as available media types, an optional tag ID, a bid floor, secure-delivery status, and an extension point. The core field list does not include AdCP’s authorization type or property selector. See the IAB OpenRTB API Specification v2.3.
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That is why an Imp does not carry the authorization scope back into the auction object: it describes the impression being offered, not which sales agent a publisher has authorized for a set of properties. Fields such as tagid and bidfloor serve other purposes and should not be treated as substitutes for the AdCP selector.
How AdCP and OpenRTB work together
The protocols are complementary rather than competing. AdCP supports agent-level workflows, while OpenRTB handles impression-level auctions. For example, a publisher’s AdCP agent can accept a create_media_buy task and use OpenRTB internally to execute impression delivery. The workflow may operate over a longer period; the OpenRTB auction happens in real time. The AdCP FAQ describes this division of roles.
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| Dimension | AdCP and adagents.json | OpenRTB 2.3 Imp |
|---|---|---|
| Scope | Agent authorization for declared properties | One offered impression or placement |
| Primary purpose | Declare and resolve authorized inventory scope | Describe an auction opportunity and its bidding details |
| Where it appears | Domain-hosted file at /.well-known/adagents.json |
An Imp object inside a bid request |
| Timing | Agent workflow can span seconds to days, as described by the AdCP FAQ | Impression auction operates in real time |
Version boundaries matter
The OpenRTB statement here is specifically about the core Imp schema in version 2.3, published by IAB in 2015. That schema provides an exchange-specific ext object, so this does not establish what any particular exchange might carry in an extension or another private integration. The precise conclusion is that OpenRTB 2.3’s core Imp does not standardize the AdCP authorization selector.
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