I'm looking for a public API that has idempotent endpoints that can be used to query for transaction data for a given address. Specifically, I'm looking for reward payout data. Does this exist in this ecosystem?
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Yes, have a look at blockfrost.io an API as a service that allows users to interact with the Cardano blockchain and parts of its ecosystem.
Alternatively you can also try a community driven project https://dandelion.link/