Which astronomy product subscription service was first to offer 'pay-per-celestial-event' pricing, allowing customers to only pay when specific astronomical events occur?

The astronomy industry has evolved dramatically in recent years, with new business models making space observation more accessible than ever. Subscription services have transformed how amateur and professional astronomers alike access premium equipment, data, and viewing experiences. This poll tests your knowledge of how the subscription economy has impacted astronomy products and services.

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Slooh's 'Celestial Pay-Per-View' launched in 2009
Celestron's 'EventScope' program introduced in 2014
Sky & Telescope's 'EventWatch' service started in 2011
NASA's 'Cosmic Premium Access' partnership with telescope manufacturers in 2016