Hi @katie,
I’m glad to see you bring up this topic! I led the Index product with Superchain Eco and can share some perspective here. However, I’ll refer to the Optimism Partnerships team to validate the information and provide a clear framework.
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Did the requirements evolve? Yes, the definitions in the Superchain are constantly changing through Governance, and the parameters have evolved over the past months. The latest (upcoming) framework is the Superchain Registry 2,0 and the latest Standard Rollup Charter.
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What are the criteria for chain eligibility for a grant? Optimism announced it here - in short, any Green or Yellow chain is eligible for rewards. Green = Adheres to the latest Standard Rollup Charter + Bridge upgradability managed by Optimism Security Council. Yellow = Following Standard Rollup Charter and working to transition Bridge upgradability to Optimism Security Council.
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Are these OP well spent? In my personal view, all Grey chains should be motivated to become Yellow and Green over time. I hope these chains will make progress toward further Superchain-alignment this Season, however I don’t think it’s an option (or good strategy) to try to get (a share) of their grant back.