October 2026

2026-10-11

• Client registration accepts only plain redirect URIs MCP

  Dynamic client registration now rejects a redirect URI that contains a backslash, a comma, @, %, #, a space or a control character, whose host is not a plain host name (for example a trailing dot or an empty port), or whose port is outside 1 to 65535. The answer is 400 with invalid_redirect_uri. The redirect URIs that MCP clients register today are unaffected, and clients that are already registered keep working.

2026-10-09

• Index Exchange: the IX CPM, the visibility and what each pricing model delivers API MCP Console

  An Index Exchange activation now carries the segment’s marketplace CPM (IX CPM USD, required, 0.01 to 99.99) and its visibility (IX Access, public or private, default public). Create Activation and Create Schedule refuse a missing or invalid CPM, an invalid access value or segment id, and a CTV audience with a 422 that names the rule. An Index Exchange connection needs no credentials (requires_credentials: false in Get Endpoint Connections) and can be used only by the organizations Index Exchange is enabled for. Get Pricing Models returns each model’s identifiers and, for Index Exchange, a delivery_label. Get Activation and the activation.completed webhook return delivery.index_exchange: the segment, the delivered file and the publication state (null for every other partner). A scheduled Index Exchange activation refreshes one segment once a cycle has registered it.

2026-10-04

• Activations can limit by lookalike score, spend and transactions API MCP

  Create Activation takes the limits the Audience Manager offers: a score range for a Lookalike Model audience (score_limit with min_score and max_score), and for an audience of one Transactions dataset, spend and transaction ranges per person (affinity_spend_limit and affinity_txn_limit with their bounds). As with the frequency filter, each limit needs its flag, and a limit the audience cannot take is rejected with 422. The activation’s filters echo them. Create Schedule takes the spend and transaction limits in its activation block, and the create_activation MCP tool lists the new fields.

• Create Activation sends the audience’s full definition, as the console does API

  Create Activation now builds what it hands to delivery from the audience exactly as the Audience Manager does. Activating a lookalike audience used to return a 500, and a Competitors audience’s activation failed during delivery; both now work. A single cohort’s metadata columns are delivered with it, and every other dataset type carries its full definition instead of only its dates.

• Attribute groups (All or Any of) for Profile Attributes API MCP Console

  A Profile Attributes dataset can now group its attributes. Each group is All (every attribute in it must match) or Any of (at least one must), and a device must satisfy every group, so “all of these, and at least one of those” fits in one dataset. In the Audience Manager use Add group; on Create Audience and Estimate Audience Size send profile_attribute_groups instead of profile_attributes. Up to 5 groups. profile_attributes keeps working as before, with one change: a group or match key on one of its rows was ignored until now and is rejected with a 422 that names the key.