pub trait FeeRateSource: Send + Sync {
// Required methods
fn name(&self) -> String;
fn fetch<'life0, 'async_trait>(
&'life0 self,
) -> Pin<Box<dyn Future<Output = Result<Feerate>> + Send + 'async_trait>>
where Self: 'async_trait,
'life0: 'async_trait;
}