The page asked mempool.space, Blockscout and PublicNode for three of the
five balances from each visitor's browser, and showed nothing for WOW and
XMR. wownero.org now reads every balance once a minute, from its own
Wownero, Bitcoin and Ethereum nodes and PublicNode for Solana, and
publishes /donations/balances.json. The page reads only that.
WOW gains a live balance from a view-only wallet and its view key is
published so anyone can verify incoming donations; XMR follows once its
view key is. A source that cannot be read shows its last value marked as
such, or says it is unavailable; it is never shown as zero.