xPub keys can never be used to access your funds. The xPub does not contain any private key information.
You would not want to expose your xPub key to the world as it would be possible to build a profile of transactions related to a specific wallet. However, supplying your xPub key to NODE40 is safe because 1) the key is kept encrypted and never exposed to the browser, and 2) the key enables us to build a ledger for your personal accounting; which is precisely why you're usingNODE40 Balance.
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