I have an application that needs to makes queries to get address balances and transaction data from Bitcoin.
What are some possible solutions to this? It would be great if I didn't have to manage a full node if possible.
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You can use a self-hosted (but low-burden!) instance of Esplora.
Blockstream is also exposing an instance for free (at the moment) at blockstream.info.
Disclaimer: if you take part of Bitcoin as an economic actor (as an application providing account balances may imply), you should really consider using your own source of truth and self-host the instance. It's just a docker to start and an nginx reverse proxy to set up after all :-).