In Norse mythology, which practice most resembled a modern subscription model, where regular offerings were given in exchange for ongoing divine services?

Before modern subscription services, myths and folklore featured characters who offered recurring benefits or services in exchange for regular offerings. These ancient 'subscription models' often involved rituals, sacrifices, or tributes to deities or magical beings who would then provide protection, good fortune, or other benefits. Test your knowledge about these mythological subscription-like arrangements that influenced cultural practices for centuries.

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Blót - regular sacrifices to gods for continued protection and good harvests
Ragnarök - a one-time apocalyptic battle between gods and giants
Einherjar - warriors chosen once by Valkyries to join Odin's hall
Yggdrasil - the world tree that provided benefits without requiring offerings