docs(exchange): add Kraken Futures notes

docs/data-download.md

@@ -268,6 +268,7 @@ If `--convert` is also provided, the resample step will happen automatically and
 
 !!! Note "Kraken user"
     Kraken users should read [this](exchanges.md#historic-kraken-data) before starting to download data.
+    Kraken Futures uses standard OHLCV downloads and does not require `--dl-trades`.
 
 Example call:
 

docs/exchanges.md

@@ -217,6 +217,44 @@ freqtrade download-data --exchange kraken --dl-trades -p BTC/EUR BCH/EUR
     Please pay attention that rateLimit configuration entry holds delay in milliseconds between requests, NOT requests/sec rate.
     So, in order to mitigate Kraken API "Rate limit exceeded" exception, this configuration should be increased, NOT decreased.
 
+## Kraken Futures
+
+Kraken Futures uses the exchange id `krakenfutures` and supports isolated futures mode.
+
+```jsonc
+"exchange": {
+    "name": "krakenfutures",
+    "key": "your_exchange_key",
+    "secret": "your_exchange_secret",
+    "ccxt_config": {"enableRateLimit": true},
+    "ccxt_async_config": {"enableRateLimit": true},
+    "triggerSignal": "mark" // "mark" (default), "last", or "index"
+},
+"trading_mode": "futures",
+"margin_mode": "isolated",
+"stake_currency": "USD"
+```
+
+!!! Tip "Stoploss on Exchange"
+    Kraken Futures supports `stoploss_on_exchange` with both `limit` and `market` stop orders.
+    Use `exchange.triggerSignal` to select the trigger price source (`mark`, `last`, or `index`).
+
+!!! Note "Collateral"
+    Kraken Futures is USD-settled. Kraken allows EUR collateral, but USD is the recommended stake currency.
+
+!!! Note "Pair format"
+    Futures pairs use CCXT symbols, for example `BTC/USD:USD`.
+
+### Data download
+
+Kraken Futures uses normal OHLCV downloads.
+
+```bash
+freqtrade download-data --exchange krakenfutures --trading-mode futures --pairs BTC/USD:USD --timeframes 1m 5m
+```
+
+Note: OHLCV requests are capped at 2000 candles per call, so large downloads may take longer.
+
 ## Kucoin
 
 Kucoin requires a passphrase for each api key, you will therefore need to add this key into the configuration so your exchange section looks as follows:

freqtrade/exchange/exchange_utils.py

@@ -54,21 +54,13 @@ def available_exchanges(ccxt_module: CcxtModuleType | None = None) -> list[str]:
     return [x for x in exchanges if validate_exchange(x)[0]]
 
 
-def _exchange_has_helper(
+def _exchange_has_helper(ex_has: dict[str, Any], required: dict[str, list[str]]) -> list[str]:
-    ex_has_or_exchange: dict[str, Any] | ccxt.Exchange,
-    required: dict[str, list[str]],
-) -> list[str]:
     """
     Checks availability of methods (or their replacement)s in a merged has-dict.
     :param ex_has: merged "has" dict (ccxt + freqtrade overrides)
     :param required: dict of required methods, with possible replacement methods as list
     :return: list of missing required methods
     """
-    if isinstance(ex_has_or_exchange, dict):
-        ex_has = ex_has_or_exchange
-    else:
-        ex_has = getattr(ex_has_or_exchange, "has", {}) or {}
-        
     return [
         k
         for k, v in required.items()