IntercontinentalExchange Inc.'s (ICE) roughly $8.2 billion deal to buy NYSE Euronext (NYX) includes a handful of potential termination fees, granting one of the parties a sizeable windfall if the acquisition were to fall apart.

On Thursday, NYSE Euronext agreed to be sold to ICE in a merger that would vastly expand ICE's profile from an energy-focused futures-market operator to a fully diversified exchange company running stock, options, futures and trade-clearing services on both sides of the Atlantic Ocean.

Under certain scenarios, including if NYSE pursues a separate offer, NYSE would be forced to pay ICE upwards of $450 million. In other instances, including a willful and material breach of the agreement by ICE, ICE would be required to pay NYSE up to $750 million.

Except under specific circumstances, neither company would be required to pay the other more than $750 million in the aggregate in the event of a break-up.

Shares of both companies are down about 2% premarket amid the broader market's sharp weakness.

Write to Ben Fox Rubin at ben.rubin@dowjones.com

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