OpenRTB (Real-Time Bidding) was initially built to standardize communication between parties for blocking inventory. It has since evolved into a standardized API protocol designed to automate the real-time trading of digital media across a range of platforms, devices, and advertising solutions.

DT supports OpenRTB versions 2.2, 2.3, and 2.5; older versions are incompatible. DT encourages Buyers to upgrade their integration to latest DT OpenRTB 2.5 specification to benefit from all supported parameters.

This article references the OpenRTB API Specification Version 2.5. The following sections detail the Open RTB parameters that DT supports and the associated values we send.

Bid Request Specifications

Attribute	Always Passed	Description
`bidrequest`	Yes	Top‑Level Object.
`source`	Yes	Request source details on post‑auction decisions, e.g., header bidding.
`regs`	Yes	Regulatory conditions are in effect for all impressions in this bid request.
`imp`	Yes	Container for the description of a specific impression; at least 1 per request.
`banner`	Yes	Details for a banner impression, including in-banner video (MRAID Video) and video companion ad (end card).
`video`	Yes	Details for a video impression.
`audio`	No	Container for an audio impression.
`format`	No	An allowed size of a banner.
`pmp`	Yes	Collection of private marketplace (PMP) deals applicable to this impression.
`deal`	Yes	Deal terms pertaining to this impression between a seller and buyer.
`app`	Yes	Details of the application calling for the impression.
`publisher`	Yes	Entity that controls the content of and distributes the site or app.
`device`	Yes	Details of the device on which the content and impressions are displayed.
`geo`	Yes	Location of the device or user’s home base depending on the parent object.
`user`	No	Human user of the device; audience for advertising.
`seatbid`	Yes	Collection of bids made by the bidder on behalf of a specific seat.
`bid`	Yes	An offer to buy a specific impression under certain business terms.

Object: BidRequest

Attribute	Always Passed	Description
`id`	Yes	Unique ID of the bid request, provided by the exchange.
`imp`	Yes	Array of Imp objects representing the impressions offered. At least 1 Imp object is required.
`app`	Yes	Details via an App object about the publisher’s app.
`device`	Yes	Details via a Device object about the user’s device to which the impression will be delivered.
`user`	Yes	Details via a User object about the human user of the device.
`test`	No	Indicator of test mode in which auctions are not billable. `0` = live mode `1` = test mode
`at`	Yes	Auction type. `1` = First Price `2` = Second Price
`tmax`	Yes	Maximum time in milliseconds the exchange allows for bids to be received including Internet latency to avoid timeout. This value supersedes any a priori guidance from the exchange.
`cur`	Yes	Array of allowed currencies for bids on this bid request using ISO-4217 alpha codes. Recommended only if the exchange accepts multiple currencies.
`bcat`	Yes	Blocked advertiser categories using the IAB content categories.
`badv`	Yes	Blocked list of advertisers by their domains.
`bapp`	Yes	Block list of applications by their platform-specific exchange independent application identifiers. On Android, these should be bundle or package names. On iOS, these are numeric ids.
`source`	Yes	A `Source` object that provides data about the inventory source and which entity makes the final decision.
`regs`	Yes	A `Regs` object that specifies any industry, legal, or governmental regulations in force for this request.

Object: Source

Attribute	Always Passed	Description
`fd`	Yes	Entity responsible for the final impression sale decision. `0` = exchange `1` = upstream source When DT Exchange is running an auction from a waterfall placement or if FairBid SDK is used, DT passes `0`. When DT is running an SDK Bidding auction, DT passes `1`, as the final decision is taken by the mediation platform.
`tid`	Yes	Transaction id that must be common across all participants in this bid request.
`ext.schain`	Yes	The SupplyChain object is composed primarily of a set of nodes where each node represents a specific entity that participates in the transacting of inventory. The entire chain of nodes from beginning to end represents all entities who are involved in the direct flow of payment for inventory.

Object: Source.ext.schain

Attribute	Always Passed	Description
`ext.schain.ver`	Yes	The version of the supply chain specification in use.
`ext.schain.complete`	Yes	Flag indicating whether the chain contains all nodes involved in the transaction leading back to the owner of the site, app, or another medium of the inventory. `0` = no `1` = yes
`ext.schain.nodes`	Yes	Array of `SupplyChainNode` objects in the order of the chain. In a complete supply chain, the first node represents the initial advertising system and seller ID involved in the transaction. DT is always node `1`.
`ext.schain.asi`	Yes	Canonical domain name of the SSP.
`ext.schain.sid`	Yes	Publisher ID.
`ext.schain.hp`	Yes	Indicates whether this node will be involved in the flow of payment for the inventory.
`ext.schain.rid`	Yes	The OpenRTB requestId of the request as issued by this seller.
`omidpn`	No	Identifier of the Open Measurement SDK integration. The default value is `DT`.
`omidpv`	No	Version of the Open Measurement SDK integration.

Object: Regs

Attribute	Always Passed	Description
`coppa`	Yes	Flag indicating if this request is subject to the COPPA regulations established by the USA FTC. `0` = no `1` = yes
`ext.gdpr`	Yes	Extension to signal whether or not the request is subject to GDPR regulations.
`ext.us_privacy`	Yes	When available froma publisher, DT always passees this value. Use the IAB US Privacy String Format. DT does not change, delete, or obfuscate any data in the bid request when the user opts-out. DT passes the U.S Privacy string to demand partners. It is the demand partner's responsibility to determine which data the CCPA allows for ad targeting purposes. For more information about CCPA, see the CCPA Resource Page.

Object: Imp

Attribute	Always Passed	Description
`id`	Yes	A unique identifier for this impression within the context of the bid request.
`metric`	No	An array of metrics. These metrics can offer insight into the impression to assist with decisioning such as average recent viewability, click-through rate, etc. Each metric is identified by its type, reports the value of the metric, and optionally identifies the source or vendor measuring the value.
`banner`	No	A Banner object is required if this impression is offered as a banner ad opportunity.
`video`	No	A Video object is required if this impression is offered as a video ad opportunity.
`pmp`	No	A PMP object containing any private marketplace deals in effect for this impression.
`displaymanager`	Yes	Name of ad mediation partner, SDK technology, or player responsible for rendering ad (typically video or mobile).
`displaymanagerver`	Yes	Version of ad mediation partner, SDK technology, or player responsible for rendering ad.
`instl`	Yes	Value indicating whether the ad is an insterstitial. `0` = ad is not an interstitial `1` = ad is interstitial or full screen
`tagid`	Yes	An identifier for specific ad placement or ad tag is used to initiate the auction.
`bidfloor`	Yes	The minimum bid for this impression is expressed in CPM.
`bidfloorcur`	Yes	Currency specified using ISO-4217 alpha codes.
`clickbrowser`	Yes	Indicates the type of browser opened upon clicking the creative in an app. `0` = embedded `1` = native
`secure`	Yes	Flag to indicate whether the impression requires secure HTTPS URL, creative assets, and markup. `0` = non-secure `1` = secure If omitted, the secure state is unknown, and you should assume non-secure HTTP support.
`exp`	Yes	Number of seconds that may elapse between the auction and the actual impression. DT uses the following default Time To Live (TTL): Rewarded: 3600 s (60 min) Interstitial: 3600 s (60 min) Banner: 1800 s (30 min) Publishers can also set up custom TTL. Contact your DT Account Manager for details.
`ext.brsrclk`	Yes	A custom extension used to force open the device's browser. When the bid request supports opening the device's external browser, DT passes `1`. For more information about implementing browsers, see Click to Native Browser.
`ext.dpl`	No	A custom extension that indicates the deep linking capability. `0` = no `1` = yes
`rwdd`	Yes	Indicates whether the user receives a reward for viewing the ad. `0` = no `1` = yes

Object: BidRequest.imp.ext.skadn

Attribute	Always Passed	Description
`version`	No	Version of skadnetwork supported. Always `2.0` or higher. Dependent on both the OS version and the SDK version. With the release of SKAdNetwork 2.1, this field is deprecated in favor of the `BidRequest.imp.ext.skadn.versions` to support an array of version numbers.
`versions`	No	Array of strings containing the supported skadnetwork versions. Always "2.0" or higher. Dependent on both the OS version and the SDK version. For example, `["2.0", "2.1", "2.2", "3.0", "4.0"]`.
`sourceapp`	Yes	ID of publisher app in Apple's App Store. For example, `880047117`.
`skadnetids`	Yes	A subset of `SDKdNetworkItem` entries in the publisher app's `info.plist`, expressed as lowercase strings, that are relevant to the bid request. Recommended that this list not exceed 10 items. For example, `["SKAdNetwork1.skadnetwork", "SKAdNetwork2.skadnetwork"]`.
`skadnetlist`	No	An object containing the IABTL list definition.
`skoverlay`	No	List of attributes (array) that should be provided on the bid response. Read more about SKOverlay.
`productpage`	No	This attribute flags supply supporting the Custom Product Page functionality; DT passes `1` when eligible, and will not pass this field when not eligible.

Object: BidRequest.device.ext

Attribute	Always Passed	Description
`atts`	Yes	(iOS Only) An integer passed to represent the app's app tracking authorization status. `0` = not determined `1` = restricted `2` = denied `3` = authorized
`ifv`	No	IDFV of the device in that publisher. Listed as ifv to match ifa field format. For example, `24252409-0099-4708-BA27-EB182EC0DAEF`

Object: Metric

Attribute	Always passed	Description
`type`	Yes	Type of metric being presented using exchange curated string names which should be published to bidders a priori.
`value`	Yes	Number representing the value of the metric. Probabilities must be in the range 0.0–1.0.
`vendor`	Yes	Source of the value using exchange curated string names which should be published to bidders a priori. If the exchange itself is the source (rather than a third party), DT recommends using `EXCHANGE`.
`ext`	No	Placeholder for exchange-specific extensions to OpenRTB.

Object: Banner

Attribute	Always Passed	Description
`format`	No	Array of format objects representing the banner sizes permitted. If none are specified, then use of the h and w attributes is highly recommended.
`w`	Yes	Exact width in device independent pixels (DIPS); recommended if no format objects are specified.
`h`	Yes	Exact height in device independent pixels (DIPS); recommended if no format objects are specified.
`btype`	Yes	Blocked banner ad types.
`battr`	Yes	Blocked creative attributes.
`pos`	Yes	Ad position on the screen.
`topframe`	Yes	Indicates if the banner is in the top frame instead of an iframe. `0` = no `1` = yes
`mimes`	Yes	Content MIME types supported.
`expdir`	No	Directions in which the banner may expand.
`api`	Yes	List of supported API frameworks for this impression.
`id`	Yes	Unique identifier for this banner object.
`vcm`	No	Relevant only for Banner objects used with a Video object in an array of companion ads. Indicates the companion banner rendering mode relative to the associated video. `0` = concurrent `1` = end-card
`ext.rewarded`	Yes	Indicates whether rewarded playables are supported. `0` = Rewarded Playables are not supported `1` = Rewarded Playables are supported
`ext.autostore`	Yes	Indicated whether the inventory is eligible for Auto Store. `0` = true `1` = false

Object: Video

Attribute	Always Passed	Description
`mimes`	Yes	Content MIME types supported.
`minduration`	Yes	Minimum video ad duration in seconds.
`maxduration`	Yes	Maximum video ad duration in seconds.
`protocols`	Yes	Array of supported video protocols. DT always passes `2, 5, 3, 6, 7, 8`.
`w`	Yes	Width of the video player in pixels.
`h`	Yes	Height of the video player in pixels.
`startdelay`	Yes	Indicates the start delay in seconds for pre-roll, mid-roll, or post-roll ad placements. DT always passes `0` for pre-roll.
`placement`	Yes	Placement type for the impression. DT always passes `5` for interstitial video.
`plcmt`	Yes	Placement (video) type for the impression. DT always passes `3` for interstitial and rewarded placement type.
`linearity`	No	Indicates if the impression must be linear, nonlinear, etc. DT always passes `1` for linear video.
`skip`	Yes	Indicates whether the player allows the video to be skipped. `0` = no `1` = yes
`skipmin`	No	Videos of total duration greater than this number of seconds can be skippable. Only applicable if the ad is skippable.
`skipafter`	No	Number of seconds a video must play before skipping is enabled; only applicable if the ad is skippable.
`battr`	Yes	Blocked creative attributes.
`maxbitrate`	No	Maximum bit rate in Kbps.
`playbackmethod`	Yes	Playback methods that may be in use. DT always respects the user's device settings. DT always passes `5` for fullscreen video.
`playbackend`	Yes	The event that causes playback to end. DT always passes `1`.
`pos`	Yes	Ad position on screen. DT always passes `7` for fullscreen.
`companionad`	Yes	An array of Banner objects if companion ads are available.
`api`	Yes	List of supported API frameworks for this impression.
`companiontype`	Yes	Supported VAST companion ad types. DT always supports `1` (static), `2` (HTML), and `3` (iframe) when companionad is supported.
`ext.rewarded`	Yes	DT always passes this custom extension for video requests. `0` = Non-rewarded `1` = Rewarded
`ext.mraidendcard`	Yes	DT always passes this custom extension for video requests. `0` = MRAID end card is not supported `1` = MRAID end card is supported
`ext.autostore`	Yes	Indicates whether the inventory is eligible for Auto Store. `0` = false `1` = true (default)
`ext.dualendcard`	No	Indicates whether the inventory is eligible for Dual End Card. `0` = false `1` = true

Object: PMP

Attribute	Always Passed	Description
`privateauction`	Yes	Indicator of auction eligibility to seats named in the Direct Deals object. `0` = all bids are accepted `1` = bids are restricted to the deals specified and the terms thereof
`deals`	Yes	Array of Deal objects that convey the specific deals applicable to this impression.

Object: Deal

Attribute	Always Passed	Description
`id`	Yes	A unique identifier for the PMP deal
`bidfloor`	Yes	Minimum bid for this impression expressed in CPM
`at`	Yes	Optional override of the overall auction type of the bid request. `1` = First Price `2` = Second Price Plus `3` = the value passed in bidfloor is the agreed upon deal price. Additional auction types can be defined by the exchange.
`wseat`	Yes	Whitelist of buyer seats (e.g., advertisers, agencies) allowed to bid on this deal. IDs of seats and the buyer’s customers to which they refer must be coordinated between bidders and the exchange a priori. Omission implies no seat restrictions.

Object: App

Attribute	Always Passed	Description
`id`	Yes	Exchange-specific id.
`name`	Yes	App name (may be aliased at the publisher's request).
`bundle`	No	A platform-specific application identifier intended to be unique to the app and independent of the exchange. On Android, this should be a bundle or package name, e.g., `com.foo.mygame`. On iOS, this is typically a numeric ID or app store ID.
`domain`	No	Domain of the app.
`storeurl`	No	App Store URL for an installed app.
`cat`	Yes	Array of IAB content categories of the app.
`ver`	Yes	Application version.
`privacypolicy`	Yes	Indicates if the app has a privacy policy. `0` = no `1` = yes
`paid`	No	Indicates whether app is the free or paid version. `0` = app is free version `1` = app is a paid version
`publisher`	Yes	Details about the Publisher of the app.
`ext.devuserid`	No	A developer's own persistent unique user identifier.
`ext.storecat`	No	Google Play and Apple App Store category definitions. For example, `Games`.
`ext.storesubcat`	No	Google Play and Apple App Store Sub-game category definitions. The array is always capped at 3 strings.
`ext.fmwname`	No	A string value describing if the app is using the unity or native framework, listed as `unity` or `native`.
`ext.apilevel`	No	(Android only) An integer value that specifies the API level supported.

Object: Publisher

Attribute	Always Passed	Description
`id`	Yes	Exchange-specific publisher id.
`name`	Yes	Publisher name (may be aliased at the publisher’s request).
`domain`	No	Highest level domain of the publisher.

Object: Device

Attribute	Always Passed	Description
`ua`	Yes	Browser user agent string that informs about device data.
`dnt`	Yes	Standard “Do Not Track” flag as set in the header by the browser. `0` = tracking is unrestricted `1` = do not track
`lmt`	No	Commercially endorsed Limit Ad Tracking signal (e.g., iOS, Android). `0` = tracking is unrestricted `1` = tracking must be limited per commercial guidelines
`ip`	Yes	IPv4 address closest to device. Example, 86.179.150.0
`ipv6`	No	IP address closest to device as IPv6.
`devicetype`	Yes	The general type of device.
`make`	No	Device make.
`model`	No	Device model.
`os`	No	Device operating system.
`osv`	No	Device operating system version.
`hwv`	No	Hardware version of the device.
`h`	Yes	Physical height of the screen in pixels.
`w`	Yes	Physical width of the screen in pixels.
`ppi`	No	Screen size as pixels per linear inch.
`pxratio`	No	The ratio of physical pixels to device-independent pixels.
`js`	Yes	Support for JavaScript. `0` = no `1` = yes
`language`	Yes	Browser language using ISO-639-1-alpha-2.
`carrier`	No	Carrier or ISP using exchange curated string names which should be published to bidders a priority.
`connectiontype`	Yes	Network connection.
`ifa`	No	Clear (not hashed) device identifier.
`ext.inputLanguage`	No	A string array containing the languages setup on the user's device keyboard.
`ext.ifv`	No	(iOS only). A persistent unique identifier for each app on a device that identifies the device to the app's vendor. The value of this property is the same for apps that come from the same vendor running on the same device. A different value is returned for apps on the same device that come from different vendors, and for apps on different devices regardless of vendor.
`ext.atts`	No	(iOS only) An integer passed to represent the app's app. tracking authorisation status. `0` = not determined `1` = restricted `2` = denied `3` = authorized
`ext.inputlanguage`	No	A string array containing the languages setup on the user's device keyboard. Country codes are passed in the string array.
`ext.diskspace`	No	An integer value describing the available disk space on the device in megabytes, where "18201" = device has 18201 MB of available disk space. MB will be rounded up and passed as a whole number to align with Apple's data user and user privacy.
`ext.totaldisk`	No	An integer value describing the total disk space on the device in megabytes, where "63989" = 63989 MB of total disk space. MB will be rounded up and passed as a whole number to align with Apple's data use and user privacy.
`ext.ringmute`	No	(Android only) An integer value describing the device sound setting during time of ad request describing if sound is set to ring or mute. `0` = ring `1` = mute
`ext.charging`	No	An integer value describing if the device is connected to a charger. `0` = unplugged `1` = plugged into power outlet
`ext.bluetooth`	No	A boolean value indicating if the device is connected to bluetooth. `0` = not connected via bluetooth `1` = connected via bluetooth
`ext.headset`	Yes	A boolean value indicating if the device is connected to a wired headset. `0` = no wired headset is connected `1` = device is connected to any wired headset
`ext.batterylevel`	No	An integer passed describing percentage of battery charge remaining on the user's device, segmented into buckets. `1` = less than 5% `2` = 9-5% `3` = 21-10% `4` = 39-25% `5` = 54-40% `6` = 69-55% `7` = 84-70% `8` = 100-85%
`ext.batterysaver`	No	A boolean value indicating if battery saver (Low Power Mode on iOS) has been enabled. `0` = battery saver not enabled `1` = battery saver enabled
`ext.darkmode`	No	A boolean value indicating if dark mode is enabled on the device. `0` = dark mode not enabled `1` = dark mode enabled
`ext.airplane`	No	(Android only) A boolean value indicating if airplane mode is enabled. `0` = airplane mode not enabled `1` = airplane mode enabled
`ext.dnd`	No	(Android only) A boolean value indicating if do not disturb setting is enabled. `0` = do not disturb not enabled `1` = do not disturb enabled

Object: Geo

Attribute	Always Passed	Description
`lat`	No	Latitude from –90.0° to +90.0°, where negative is south.
`lon`	No	Longitude from –180.0° to +180.0°, where negative is west.
`type`	No	Source of location data; recommended when passing lat/lon.
`accuracy`	No	Estimated location accuracy in meters; recommended when lat/lon are specified and derived from the location service on a device.
`lastfix`	No	The number of seconds since this geolocation fix was established. Note that devices may cache location data across multiple fetches. Ideally, this value should be from the time the actual fix was taken.
`ipservice`	No	Service or provider used to determine geolocation from IP address if applicable.
`country`	Yes	Country code using ISO-3166-1-alpha-3.
`region`	No	Region code using ISO-3166-2; 2-letter state code if USA.
`city`	No	City using United Nations Code for Trade & Transport Locations. For more information about UN codes, see Appendix A of the OpenRTB Specification version 2.5.
`zip`	No	The home zip or postal code of the user.
`utcoffset`	No	Local time as the number +/– of minutes from UTC.
`dma`	Yes	Maxmind DMA code based on IP.
`metro`	Yes	Maxmind Metro code based on IP.

Object: User

Attribute	Always Passed	Description
yob	No	Year of birth as a 4-digit integer.
gender	No	Gender. `M` = male `F` = female `O` = known to be other, i.e., omitted is unknown
ext.consent	Yes	Extension to signal whether or not the user subject to GDPR regulations has given consent.
ext.impdepth	No	The count of impressions for a specific placement type in a given app session. The impression depth is reset once the session ends.
ext.sessionduration	No	The total duration of a time a user has spent so far in a specific app session expressed in seconds. For example, a user has been playing Word Game for 45 seconds.
ext.lastbundle	No	(iOS only) The last app bundle the user saw on the previous impression in a given session per placement type.
ext.lastadomain	No	The last advertiser domain the user saw on the previous impression in a given session per placement type.
ext.clickrate	No	The percentage of clicks or impressions per user per placement type over a given number of impressions. For example, 5 represents a 5% CTR.
ext.lastclick	No	VAST specific. A boolean value indicating if the user skipped the video on the last impression in a given session, where `1` = user skipped
ext.lastclicktype	No	VAST Specific. An integer value indicating what part of the video the user clicked on. `0` = no click `1` = ClickThrough `2` = CompanionClickThrough
ext.completionrate	No	For Rewarded and Video placement types, the percentage of completions or impressions per user per placement type for a given number of impressions. For example, 70 indicates a 70% completion rate.

Bid Response Specifications

When replying to a bid request for a Rewarded Playable ad, you must include specific values in your bid response. For more information about what to include in your response, see Responding with a Rewarded Playable Ad (Bid Response).

Object: BidResponse

Attribute	Required	Description
`id`	Yes	The bid response id must be the same as the bid request ID. They are used for tracking purposes.
`seatbid`	Yes	Array of seatbid objects. A bid must contain one or more seatbid objects.
`bid`	No	Bidder generated response ID for logging and tracking purposes.
`cur`	No	Bid currency using ISO-4217 alpha codes. USD is the only supported currency on DT.

Object: SeatBid

Attribute	Required	Description
`bid`	Yes	Array of one or more Bid objects (Section 4.2.3) each related to an impression. Multiple bids can relate to the same impression.
`seat`	Yes	ID of the buyer seat, e.g., advertiser, agency, etc. on whose behalf this bid is made.

Object: Bid

Attribute	Required	Description
`id`	Yes	Bidder generated bid ID for logging/tracking purposes.
`impid`	Yes	ID of the `Imp` object in the related bid request.
`price`	Yes	Bid price expressed as CPM although the actual transaction is for a unit impression only.
`nurl`	No	Win notice URL called by the exchange if the bid wins (not necessarily indicative of a delivered, viewed, or billable ad); optional means of serving ad markup. Substitution macros (Section 4.4) may be included in both the URL and optionally returned markup.
`burl`	Yes	Billing notice URL called by the exchange when a winning bid becomes billable based on exchange-specific business policy (e.g., typically delivered, viewed, etc.). May include substitution macros (Section 4.4).
`lurl`	No	Loss notice URL called by the exchange when a bid is known to have been lost. May include substitution macros (Section 4.4). Exchange-specific policy may preclude support for loss notices or the disclosure of winning clearing prices resulting in `${AUCTION_PRICE}` macros being removed, i.e., replaced with a zero-length string.
`adm`	Yes	Optional means of conveying ad markup in case the bid wins; supersedes the win notice if markup is included in both. May include substitution macros (Section 4.4).
`adomain`	Yes	Advertiser domain for block list checking, e.g., “xyzco.com”. This can be an array in the case of rotating creatives. Exchanges can mandate that only one domain is allowed.
`bundle`	No	A platform-specific application identifier intended to be unique to the app and independent of the exchange. On Android, this is the bundle or package name, e.g., `com.foo.mygame`. On iOS, it is a numeric ID.
`iurl`	No	URL without cache-busting to an image that is representative of the content of the campaign for ad quality/safety checking.
`cid`	Yes	Campaign ID to assist with ad quality checking; the collection of creatives for which iurl should be representative.
`crid`	Yes	Creative ID to assist with ad quality checking.
`cat`	No	IAB content categories of the creative. Refer to List 5.1 of the OpenRTB Specification version 2.5.
`attr`	No	Set of attributes describing the creative.
`dealid`	No	If this bid pertains to a private marketplace direct deal, this is a reference to the `deal.id` from the bid request.
`ext.crtype`	No	Custom extension used to identify the type of ad markup with which the DSP responds.
`ext.skadn`	No	Extension to submit the click data and signature to SKAdNetwork for attribution.
`ext.autostore`	No	Indicates whether DTX should enable automatically displaying the Store. `0` = false `1` = true For more information about displaying the Store, see Auto Store.
`ext.autostoreclick`	No	Indicates whether DT Exchange should fire click trackers when displaying the Store. `0` = false `1` = true; For more information about options when displaying the Store, see Auto Store.
`ext.clicktrackers`	No	Array of click trackers to be fired by DT Exchange SDK for the autoclick feature. This is not relevant for VAST ads.
`ext.dualendcard`	No	Indicates whether DTX should render the Dual End Card. `0` = false `1` = true

Bid.ext.crtype

Ad Format	Values on Bid Response
`HTML Ads`	HTML
`MRAID`	MRAID 1.0, MRAID 2.0, MRAID 3.0
`VAST`	VAST 2.0, VAST 3.0
`Playables`	Playable
`Rewarded Playables`	Playable
`Rewarded Video`	VAST 2.0, VAST 3.0
`MRAID Video`	Null

Bid.ext.skadn (SKAdNetwork)

Attribute	Required	Description
`version`	Yes	Version of SKAdNetwork desired. Must be 2.0 or above.
`network`	No	Ad network identifier used in signature. This should match one of the items in the `skadnetids` array in the request, e.g., `dsp1.skadnetwork`.
`campaign`	No	Campaign ID compatible with Apple's spec. As of version 2.0, this should be an integer between 1 and 100, expressed as a string, e.g., `45`.
`itunesitem`	No	ID of advertiser's app in Apple's app store. This should match `BidResponse.seatbid.bid.bundle`.
`fidelities`	No	Supports multiple fidelity types introduced in SKAdNetwork 2.2, e.g., `880047117`.
`nonce`	No	A unique ID for each ad response. Refer to Apple's documentation for proper UUID format. With the release of SKAdNetwork 2.2, this field is deprecated in favor of `BidResponse.seatbid.bid.ext.dkadn.fidelities.nonce`, e.g., `beeeb65e-b3de-02420004"`.
`sourceapp`	No	ID of publisher's app in Apple's app store. This should match `BidRequest.imp.ext.skad.sourceapp`, e.g., `123456789`.
`timestamp`	No	Unix time (in milliseconds) string used at the time of signature. With the release of SKAdNetwork 2.2, this field is deprecated in favor of `BidResponse.seatbid.bid.ext.skadn.fidelities.timestamp` to support multiple fidelity-types, e.g., `1594406341`.
`signature`	No	SKAdNetwork signature as specified by Apple. With the release of SKAdNetwork 2.2, this field is deprecated in favor of the `BidResponse.seatbid.bid.ext.skadn.fidelities.signature` to support multiple fidelity-types, e.g., `MEQCIEQZRRyMyUXg==`.
`skoverlay`	No	SKOverlay auto present support.
`productpageid`	No	Product Page id to direct to on click.

Bid.ext.skadn.skoverlay (SKOverlay)

Attribute	Required	Description
`present`	Yes	Denotes whether DTX should present the SKOverlay. `0` = do not present the SKOverlay `1` = present the SKOverlay
`dismissible`	No	Denotes whether the overlay should be dismissable by the user. `0` = not dismissable `1` = dismissable
`delay`	No	Delay in seconds (`0`‑`60`) before showing the overlay.
`pos`	No	Position of the overlay. `0` = bottom `1` = bottom raised
`endcarddelay`	No	Delay in seconds (`0`‑`60`) before showing the overlay on top of the end card. If you do not want to show the overlay on top of the end card, use `‑1`.
`autoclose`	No	Time in seconds (`0`‑`60`) to automatically dismiss the endcard.
`ext`	No	Placeholder for exchange-specific extensions to OpenRTB, e.g., `{}`.

Bid.ext.fidelities

Attribute	Required	Description
`fidelity`	Yes	The fidelity-type of the attribution to track.
`nonce`	Yes	An ID unique to each ad response. Refer to Apple's documentation for the proper UUID format requirements.
`timestamp`	Yes	Unix time (in milliseconds) string used at the time of signature.
`signature`	Yes	SKAdNetwork signature as specified by Apple.

Enumerated Lists

IAB Categories

For the complete list, including the sub categories, see Table 5.1 of the OpenRTB 2.3.

Value	Description
`IAB1`	Arts & Entertainment
`IAB2`	Automotive
`IAB3`	Business
`IAB4`	Careers
`IAB5`	Education
`IAB6`	Family & Parenting
`IAB7`	Health & Fitness
`IAB8`	Food & Drink
`IAB9`	Hobbies & Interests
`IAB10`	Home & Garden
`IAB11`	Law, Government and Politics
`IAB12`	News
`IAB13`	Personal Finance
`IAB14`	Society
`IAB15`	Science
`IAB16`	Pets
`IAB17`	Sports
`IAB18`	Style & Fashion
`IAB19`	Technology & Computing
`IAB20`	Travel
`IAB21`	Real Estate
`IAB22`	Shopping
`IAB23`	Religion & Spirituality
`IAB24`	Uncategorized
`IAB25`	Non-Standard Content
`IAB26`	Illegal Content

Creative Attributes Table

The following attributes are from the Table 5.3 of the OpenRTB 2.3 Specifications.

Value	Description
`1`	Audio Ad (Auto Play).
`2`	Audio Ad (User Initiated.)
`3`	Expandable (Automatic).
`4`	Expandable (User initiated‑Click).
`5`	Expandable (User initiated‑Rollover).
`6`	In banner video ad (Auto play).
`7`	In banner video ad (User initiated).
`8`	Pop, i.e., Over Under or Upon Exit.
`9`	Provocative or suggestive imagery.
`10`	Shaky, flashing, flickering, extreme animation, or smileys.
`11`	Surveys.
`12`	Text only.
`13`	User Interactive, i.e., embedded games.
`14`	Windows dialog or alert style.
`15`	Has audio on/off button.
`16`	Ad can be skipped,i.e., skip button on preroll video.

API Frameworks Table

The following attibutes are from the Table 5.3 of the OpenRTB Specification version 2.5.

Value	Description
`3`	MRAID-1
`4`	ORMMA
`5`	MRAID-2
`7`	OMID-1