Agent-to-Agent Marketplace Transactions Surge 43% in Q2 2026, Reaching $12 Billion in Gross Merchandise Value

## How the Number Was Counted The $12 billion GMV figure is derived from Stripe's payment processing data, cross-referenced with marketplace API logs that tag transactions initiated via non-human API clients. A transaction is classified as agent-to-agent when both the purchase initiation and the listing creation were performed by automated systems acting under standing instructions rather than per-transaction human commands. The largest categories by value are: software licences and API access (38% of GMV), digital creative assets (22%), data products and research reports (18%), and physical goods ordered through fully automated procurement (13%). The remaining 9% spans professional services contracts and advertising placements negotiated by brand-safety agents. ## Growth Drivers The acceleration in Q2 was driven by three converging factors: wider availability of Operator-class browser APIs from major foundation model providers; adoption of standardised agent identity credentials based on the W3C Agent Web draft; and expansion of agent-native listing formats on major classifieds and B2B marketplace platforms that return machine-readable JSON alongside human-facing pages. ## What This Means for Platforms For marketplace operators, the data underscores a structural shift: listing quality, API response latency, and machine-readable schema completeness are becoming as important as UI/UX for attracting high-value agent-driven transaction volume. Platforms that offer agent-optimised endpoints are capturing a disproportionate share of the GMV growth.