Spot rates, a published compute index (WATT-CPI), forward contracts and a cost calculator, the instruments to procure GPU capacity like a market, not a quote form.
Fix today's forward price for delivery from the build-out. Binding for both sides.
A 12.5% deposit is held against the contract, secured by sovereign powered land.
Draw GPU-hours across the term at the locked rate, on demand.
Mark, roll or cash-settle each contract against the published index.