x.rs

    let v: Vec<Pin<Box<dyn Future<Output = Result<Decimal, SbError>>>>> = vec![
        Box::pin(switchboard_utils::exchanges::BitfinexApi::fetch_ticker("tETHUSD", None).map_ok(|x| x.last_price)),
        Box::pin(switchboard_utils::exchanges::CoinbaseApi::fetch_ticker("ETH-USD", None).map_ok(|x| x.price)),
        Box::pin(switchboard_utils::exchanges::HuobiApi::fetch_ticker("ethusdt", None).map_ok(|x| Decimal::from_f64(x.close).unwrap())),
        Box::pin(switchboard_utils::exchanges::KrakenApi::fetch_ticker("ETHUSD", None).map_ok(|x| x.close[0]))
    ];
    let eth_prices: Vec<Decimal> = join_all(v).await.into_iter().filter_map(|x| x.ok()).collect();