Oh OK I see now.
The filter modifies the JSON-API responses. The JSON-API data is used by the dynamic UIs.
If you are going to use template=”static”, then yes, the best way to do this is to modify the template.
Instead of
if ( isset( $adapters[ $atts['symbol'] ] ) ) {
$balance_str = sprintf( $adapters[ $atts['symbol'] ]->get_sprintf(), $balance );
} else {
$balance_str = sprintf( "$atts[symbol] %01.8f", $balance );
}
You could have something like:
$balance_str = sprintf( "%01.8f", $balance );
You should place your modified copy of the template under your theme directory, at /templates/wallets/balance-static.php, as described here.
Hope this helps, and apologies for the confusion.