An Other Transaction is exactly what it sounds like: a transaction other than a standard federal contract, grant, or cooperative agreement. Congress created the authority so the Defense Department could work with commercial and nontraditional companies without dragging them through the full Federal Acquisition Regulation.
Under an OT prototype agreement, you generally avoid DCAA cost audits, government-unique cost accounting systems, and the heaviest FAR/DFARS clauses. IP terms are negotiated rather than dictated, so you can often keep your commercial intellectual property. Negotiation takes weeks, not quarters.
You're being paid to build a prototype. No equity changes hands, no board seat, no repayment. For a hardware startup, that's capital that funds engineering without touching your cap table.
OT success metrics are written into the agreement — hit them and production follows. Simulation is how teams de-risk hitting them; ask about an Ansys evaluation to model your prototype before you build it.
See if you qualify for an Ansys eval The MVP playbook →Here's the part founders underestimate. Under 10 U.S.C. §4022, a successfully completed prototype OT can transition into a sole-source production OT or FAR contract — no new competition. DIU reports that about 51% of completed prototypes transition to production, and those production deals can dwarf the prototype (Anduril's counter-UAS production OT with DIU was reported at ~$99M).
DIU is the best-known user, but many DoD organizations wield OT authority, including SOCOM, the Army, the Air Force (through AFWERX), and DARPA. To receive a prototype OT you generally need meaningful nontraditional participation, or a one-third cost-share if only traditional contractors are involved. Most commercial startups qualify as nontraditional automatically, which is a large part of why OTs and startups fit together so well.
Because OT terms are negotiated, intellectual property is on the table rather than dictated by regulation. That's an advantage — you can often retain your commercial IP and license only what's needed — but it means the IP clause deserves real attention before you sign. Founders who skim this later regret it. Bring someone who understands government IP terms to the negotiation.
Everything hinges on the success metrics written into your agreement. Miss them and there's no automatic path forward. That's why the strongest teams model their prototype's physics up front — see simulation for dual-use hardware — so the milestones they sign up for are ones they've already proven on screen. Learn the full application path in how to apply to a DIU CSO.
Official sources: DAU — Prototype OTs · DIU — Commercial. Figures change; confirm on the official page before relying on them.
