As transaction volumes grow, operating a listening node wil…
As transaction volumes grow, operating a listening node will become more of a business overhead. One approach to managing this has been described recently by Moneybutton here: https://blog.moneybutton.com/2019/07/29/towards-scalable-wallet-infrastructure/
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There are other options as well. One way is to think of block explorers as prototypes for data service providers. At the moment, most of them provide this service for free. Sometimes they have an additional commercial service available.