Code from documentation return an error - AGAIN

Here’s a diagnostic wrapper you can use around your universe selection function. Add this into your QuantConnect algorithm (replacing your universe/add_universe call and selection function), and run a backtest. This will clearly log the input from CoinGecko, all candidates, and forcibly select up to 5 coins to ensure your logic isn't filtering too aggressively.

Copy and adapt this pattern to your project to debug what the CoinGeckoUniverse is returning:

from AlgorithmImports import *

class DebugCoinGeckoUniverseAlgorithm(QCAlgorithm):
    def initialize(self) -> None:
        self.set_start_date(2021, 1, 1)
        self.set_end_date(2022, 1, 1)
        self.set_cash(100000)

        # We'll add a CoinGeckoUniverse by passing the data type, a friendly name, and our selection function.
        # The engine will call our function with a list of CoinGeckoUniverse objects each time new data arrives.
        self.add_universe(
            CoinGeckoUniverse,
            "CoinGeckoDebugUniverse",
            self.debug_coin_gecko_selection
        )

    def debug_coin_gecko_selection(self, data: List[CoinGeckoUniverse]) -> List[str]:
        # 1) Log the raw data count
        data_count = len(data)
        self.debug(f"[DebugCoinGeckoSelection] Raw data count: {data_count}")
        if data_count == 0:
            self.debug("[DebugCoinGeckoSelection] No CoinGecko data available.")
            return []

        # 2) Log the symbol values of each CoinGeckoUniverse entry
        coin_names = [cg.symbol.value for cg in data]
        self.debug(f"[DebugCoinGeckoSelection] Candidate coin Symbols (pre-filter): {coin_names}")

        # 3) Force selection of the first 5 items to ensure multiple are returned for debugging
        selected_coins = coin_names[:5]
        self.debug(f"[DebugCoinGeckoSelection] Selected coin Symbols (post-filter): {selected_coins}")

        # 4) Return the final list of symbols
        return selected_coins

This way, you’ll quickly spot if your issue is with the data source or with your actual filtering logic. If this still only logs one available symbol, the problem is likely with the upstream data offered by QuantConnect’s CoinGecko integration (or with universe config). If you see all candidates and only one is selected "post-filter," revise the filtering further. Let me know what logs you get!

Sources: Kraken Crypto Price Data - QuantConnect.com, Binance US Crypto Price Data - QuantConnect.com, Coinbase Crypto Price Data - QuantConnect.com, Dropbox Base Data Universe Selection Algorithm, Bitfinex Crypto Price Data - QuantConnect.com

Sorry Mislav, we'll get it addressed by tomorrow. In future so we don't miss messages like this please send in a support ticket or create a data issue and email it to support.