Fix exchange

Signed-off-by: Herklos <herklos@drakkar.software>

Author: Herklos

rust/src/exchange.rs

@@ -3174,7 +3174,6 @@ pub trait Exchange: ValueTrait {
         }
         let mut request = if params.is_object() { params.clone() } else { Value::new_object() };
         request.set("symbol".into(), symbol.clone());
-        request.set("timeframe".into(), timeframe.clone());
         request.set("interval".into(), timeframe.clone());
         if since.is_nonnullish() { request.set("since".into(), since.clone()); request.set("startTime".into(), since.clone()); }
         if limit.is_nonnullish() { request.set("limit".into(), limit.clone()); }
@@ -3184,6 +3183,10 @@ pub trait Exchange: ValueTrait {
         }
         for token in ["klines", "candles", "ohlcv"] {
             for (api_name, method_name, path_name) in &dynamic_calls {
+                // Skip non-public APIs (futures, options, etc.) — they require
+                // different params (e.g. 'pair' instead of 'symbol') and are not
+                // appropriate for generic spot OHLCV fetching.
+                if api_name.as_str() != "public" { continue; }
                 if method_name.as_str() != "GET" || path_name.contains('{') { continue; }
                 let p = path_name.to_lowercase();
                 if p == token || p.contains(token) {