My goal is to monitor a few addresses but without using a third party service. How do some blockexplorers provide an API to watch addresses and notify you (Webhook) when funds are sent to or from the address if -walletnotify is not something one can use?
There is one tool that I know that you can use to watch addresses only if you are ok with email notifications?
Have you heard of Blockonomics watcher? Check this tool below
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https://help.blockonomics.co/support/solutions/articles/33000248601-wallet-watcher-faq They also have API for wallet watcher check the API
here