X API adds a paid_partnership field for disclosing paid promotion

What changed

On June 3, 2026 X added a paid_partnership field to posts. Setting it to true when creating a post labels the post as a paid promotion. When reading posts, the value is true when the author has disclosed paid promotion.

What it means

Posts created through the API can now carry X's paid promotion label, which matters for sponsored content.

Who is affected

Developers of scheduling tools and marketers who publish sponsored or influencer posts on X.

What to do

When creating a post with POST /2/tweets, set paid_partnership to true for posts containing paid promotion. To read it, request tweet.fields=paid_partnership.