refactor(V2): bybit client da pybit a httpx puro (parità V1)

src/cerbero_mcp/exchanges/bybit/client.py

@@ -1,13 +1,33 @@
+"""Bybit V5 REST API client (httpx puro, no SDK).
+
+Implementazione diretta su `httpx.AsyncClient` per i tool Cerbero MCP V2.
+Mantiene parità di interfaccia con la versione precedente basata su
+`pybit.unified_trading.HTTP` per non rompere `tools.py` né i router.
+
+Auth Bybit V5:
+    Header X-BAPI-SIGN = HMAC_SHA256(secret,
+        timestamp + api_key + recv_window + (body_json | querystring))
+"""
 from __future__ import annotations
 
-import asyncio
+import hashlib
+import hmac
+import json
+import time
+import uuid
 from typing import Any
+from urllib.parse import urlencode
 
-from pybit.unified_trading import HTTP
+import httpx
 
 from cerbero_mcp.common import indicators as ind
 from cerbero_mcp.common import microstructure as micro
 
+BASE_MAINNET = "https://api.bybit.com"
+BASE_TESTNET = "https://api-testnet.bybit.com"
+DEFAULT_RECV_WINDOW = "5000"
+DEFAULT_TIMEOUT = 15.0
+
 
 def _f(v: Any) -> float | None:
     try:
@@ -23,37 +43,143 @@ def _i(v: Any) -> int | None:
         return None
 
 
+class BybitAPIError(RuntimeError):
+    """Errore di trasporto Bybit V5 (non gestito a livello envelope)."""
+
+
 class BybitClient:
+    """Async REST client per Bybit V5 (linear/inverse/spot/option)."""
+
     def __init__(
         self,
         api_key: str,
         api_secret: str,
         testnet: bool = True,
-        http: Any | None = None,
+        http: httpx.AsyncClient | None = None,
         base_url: str | None = None,
     ) -> None:
         self.api_key = api_key
         self.api_secret = api_secret
         self.testnet = testnet
-        # pybit HTTP non accetta `endpoint` come kwarg (vedi _V5HTTPManager.__init__:
+        self.base_url = base_url or (BASE_TESTNET if testnet else BASE_MAINNET)
-        # solo `domain`/`tld`/`testnet`). Override URL applicato post-init
+        self.recv_window = DEFAULT_RECV_WINDOW
-        # sovrascrivendo l'attributo `endpoint` dell'istanza HTTP.
+        # `http` injection è usato dai test per montare un AsyncClient con
-        self.base_url = base_url
+        # `httpx.MockTransport`. In produzione creiamo un client dedicato.
-        if http is None:
+        self._owns_http = http is None
-            http = HTTP(
+        self._http: httpx.AsyncClient = http or httpx.AsyncClient(
-                api_key=api_key,
+            timeout=DEFAULT_TIMEOUT
-                api_secret=api_secret,
-                testnet=testnet,
         )
-            if base_url:
-                http.endpoint = base_url
-        self._http = http
 
-    async def _run(self, fn, /, **kwargs):
+    async def aclose(self) -> None:
-        return await asyncio.to_thread(fn, **kwargs)
+        """Chiude l'AsyncClient httpx se di nostra proprietà."""
+        if self._owns_http:
+            await self._http.aclose()
+
+    # ── auth helpers ───────────────────────────────────────────
+
+    def _timestamp_ms(self) -> str:
+        return str(int(time.time() * 1000))
+
+    def _sign(self, timestamp: str, payload: str) -> str:
+        msg = timestamp + self.api_key + self.recv_window + payload
+        return hmac.new(
+            self.api_secret.encode("utf-8"),
+            msg.encode("utf-8"),
+            hashlib.sha256,
+        ).hexdigest()
+
+    def _signed_headers(self, payload: str) -> dict[str, str]:
+        ts = self._timestamp_ms()
+        sig = self._sign(ts, payload)
+        return {
+            "X-BAPI-API-KEY": self.api_key,
+            "X-BAPI-TIMESTAMP": ts,
+            "X-BAPI-RECV-WINDOW": self.recv_window,
+            "X-BAPI-SIGN": sig,
+            "Content-Type": "application/json",
+        }
 
     @staticmethod
-    def _parse_ticker(row: dict) -> dict:
+    def _clean_params(params: dict[str, Any] | None) -> dict[str, Any]:
+        if not params:
+            return {}
+        return {k: v for k, v in params.items() if v is not None}
+
+    @staticmethod
+    def _querystring(params: dict[str, Any]) -> str:
+        # Bybit accetta querystring nell'ordine in cui viene serializzata la
+        # request. Per la signature usiamo lo stesso urlencode (ordine
+        # inserzione dict). In Python 3.7+ dict mantiene insertion order:
+        # mantenere coerenza tra signature payload e URL effettivo.
+        return urlencode(params)
+
+    # ── request primitives ─────────────────────────────────────
+
+    async def _request_public(
+        self,
+        method: str,
+        path: str,
+        params: dict[str, Any] | None = None,
+    ) -> dict[str, Any]:
+        clean = self._clean_params(params)
+        url = self.base_url + path
+        resp = await self._http.request(
+            method, url, params=clean if clean else None
+        )
+        return self._parse_response(resp)
+
+    async def _request_signed(
+        self,
+        method: str,
+        path: str,
+        params: dict[str, Any] | None = None,
+        body: dict[str, Any] | None = None,
+    ) -> dict[str, Any]:
+        url = self.base_url + path
+        method = method.upper()
+        if method == "GET":
+            clean = self._clean_params(params)
+            qs = self._querystring(clean)
+            headers = self._signed_headers(qs)
+            resp = await self._http.request(
+                method, url, params=clean if clean else None, headers=headers
+            )
+        else:
+            payload_body = body or {}
+            body_json = json.dumps(payload_body, separators=(",", ":"))
+            headers = self._signed_headers(body_json)
+            resp = await self._http.request(
+                method, url, content=body_json, headers=headers
+            )
+        return self._parse_response(resp)
+
+    @staticmethod
+    def _parse_response(resp: httpx.Response) -> dict[str, Any]:
+        try:
+            data = resp.json()
+        except Exception as e:  # pragma: no cover - difficilmente raggiungibile
+            raise BybitAPIError(
+                f"invalid JSON from Bybit (status={resp.status_code}): {resp.text[:200]}"
+            ) from e
+        if resp.status_code >= 500:
+            raise BybitAPIError(
+                f"bybit server error {resp.status_code}: "
+                f"{data.get('retMsg', resp.text[:200])}"
+            )
+        if not isinstance(data, dict):
+            raise BybitAPIError(f"unexpected payload type: {type(data).__name__}")
+        return data
+
+    def _envelope(self, resp: dict[str, Any], payload: dict[str, Any]) -> dict[str, Any]:
+        code = resp.get("retCode", 0)
+        if code != 0:
+            return {"error": resp.get("retMsg", "bybit_error"), "code": code}
+        return payload
+
+    # ── parsers shared ─────────────────────────────────────────
+
+    @staticmethod
+    def _parse_ticker(row: dict[str, Any]) -> dict[str, Any]:
         return {
             "symbol": row.get("symbol"),
             "last_price": _f(row.get("lastPrice")),
@@ -66,9 +192,13 @@ class BybitClient:
             "open_interest": _f(row.get("openInterest")),
         }
 
+    # ── market data (public) ───────────────────────────────────
+
     async def get_ticker(self, symbol: str, category: str = "linear") -> dict:
-        resp = await self._run(
+        resp = await self._request_public(
-            self._http.get_tickers, category=category, symbol=symbol
+            "GET",
+            "/v5/market/tickers",
+            params={"category": category, "symbol": symbol},
         )
         rows = (resp.get("result") or {}).get("list") or []
         if not rows:
@@ -86,8 +216,10 @@ class BybitClient:
     async def get_orderbook(
         self, symbol: str, category: str = "linear", limit: int = 50
     ) -> dict:
-        resp = await self._run(
+        resp = await self._request_public(
-            self._http.get_orderbook, category=category, symbol=symbol, limit=limit
+            "GET",
+            "/v5/market/orderbook",
+            params={"category": category, "symbol": symbol, "limit": limit},
         )
         r = resp.get("result") or {}
         return {
@@ -106,17 +238,17 @@ class BybitClient:
         end: int | None = None,
         limit: int = 1000,
     ) -> dict:
-        kwargs = dict(
+        params: dict[str, Any] = {
-            category=category,
+            "category": category,
-            symbol=symbol,
+            "symbol": symbol,
-            interval=interval,
+            "interval": interval,
-            limit=limit,
+            "limit": limit,
-        )
+        }
         if start is not None:
-            kwargs["start"] = start
+            params["start"] = start
         if end is not None:
-            kwargs["end"] = end
+            params["end"] = end
-        resp = await self._run(self._http.get_kline, **kwargs)
+        resp = await self._request_public("GET", "/v5/market/kline", params=params)
         rows = (resp.get("result") or {}).get("list") or []
         rows_sorted = sorted(rows, key=lambda r: int(r[0]))
         candles = [
@@ -168,8 +300,10 @@ class BybitClient:
         return out
 
     async def get_funding_rate(self, symbol: str, category: str = "linear") -> dict:
-        resp = await self._run(
+        resp = await self._request_public(
-            self._http.get_tickers, category=category, symbol=symbol
+            "GET",
+            "/v5/market/tickers",
+            params={"category": category, "symbol": symbol},
         )
         rows = (resp.get("result") or {}).get("list") or []
         if not rows:
@@ -184,9 +318,10 @@ class BybitClient:
     async def get_funding_history(
         self, symbol: str, category: str = "linear", limit: int = 100
     ) -> dict:
-        resp = await self._run(
+        resp = await self._request_public(
-            self._http.get_funding_rate_history,
+            "GET",
-            category=category, symbol=symbol, limit=limit,
+            "/v5/market/funding/history",
+            params={"category": category, "symbol": symbol, "limit": limit},
         )
         rows = (resp.get("result") or {}).get("list") or []
         hist = [
@@ -205,9 +340,15 @@ class BybitClient:
         interval: str = "5min",
         limit: int = 288,
     ) -> dict:
-        resp = await self._run(
+        resp = await self._request_public(
-            self._http.get_open_interest,
+            "GET",
-            category=category, symbol=symbol, intervalTime=interval, limit=limit,
+            "/v5/market/open-interest",
+            params={
+                "category": category,
+                "symbol": symbol,
+                "intervalTime": interval,
+                "limit": limit,
+            },
         )
         rows = (resp.get("result") or {}).get("list") or []
         points = [
@@ -226,17 +367,22 @@ class BybitClient:
             "points": points,
         }
 
-    async def get_instruments(self, category: str = "linear", symbol: str | None = None) -> dict:
+    async def get_instruments(
-        kwargs: dict[str, Any] = {"category": category}
+        self, category: str = "linear", symbol: str | None = None
+    ) -> dict:
+        params: dict[str, Any] = {"category": category}
         if symbol:
-            kwargs["symbol"] = symbol
+            params["symbol"] = symbol
-        resp = await self._run(self._http.get_instruments_info, **kwargs)
+        resp = await self._request_public(
+            "GET", "/v5/market/instruments-info", params=params
+        )
         rows = (resp.get("result") or {}).get("list") or []
         instruments = []
         for r in rows:
             pf = r.get("priceFilter") or {}
             lf = r.get("lotSizeFilter") or {}
-            instruments.append({
+            instruments.append(
+                {
                     "symbol": r.get("symbol"),
                     "status": r.get("status"),
                     "base_coin": r.get("baseCoin"),
@@ -244,39 +390,48 @@ class BybitClient:
                     "tick_size": _f(pf.get("tickSize")),
                     "qty_step": _f(lf.get("qtyStep")),
                     "min_qty": _f(lf.get("minOrderQty")),
-            })
+                }
+            )
         return {"category": category, "instruments": instruments}
 
     async def get_option_chain(self, base_coin: str, expiry: str | None = None) -> dict:
-        kwargs: dict[str, Any] = {"category": "option", "baseCoin": base_coin.upper()}
+        resp = await self._request_public(
-        resp = await self._run(self._http.get_instruments_info, **kwargs)
+            "GET",
+            "/v5/market/instruments-info",
+            params={"category": "option", "baseCoin": base_coin.upper()},
+        )
         rows = (resp.get("result") or {}).get("list") or []
         options = []
         for r in rows:
             delivery = r.get("deliveryTime")
             if expiry and expiry not in r.get("symbol", ""):
                 continue
-            options.append({
+            options.append(
+                {
                     "symbol": r.get("symbol"),
                     "base_coin": r.get("baseCoin"),
                     "settle_coin": r.get("settleCoin"),
                     "type": r.get("optionsType"),
                     "launch_time": int(r.get("launchTime", 0)),
                     "delivery_time": int(delivery) if delivery else None,
-            })
+                }
+            )
         return {"base_coin": base_coin.upper(), "options": options}
 
+    # ── account / positions / orders (signed) ─────────────────
+
     async def get_positions(
         self, category: str = "linear", settle_coin: str = "USDT"
     ) -> list[dict]:
-        kwargs: dict[str, Any] = {"category": category}
+        params: dict[str, Any] = {"category": category}
         if category in ("linear", "inverse"):
-            kwargs["settleCoin"] = settle_coin
+            params["settleCoin"] = settle_coin
-        resp = await self._run(self._http.get_positions, **kwargs)
+        resp = await self._request_signed("GET", "/v5/position/list", params=params)
         rows = (resp.get("result") or {}).get("list") or []
         out = []
         for r in rows:
-            out.append({
+            out.append(
+                {
                     "symbol": r.get("symbol"),
                     "side": r.get("side"),
                     "size": _f(r.get("size")),
@@ -285,12 +440,15 @@ class BybitClient:
                     "leverage": _f(r.get("leverage")),
                     "liquidation_price": _f(r.get("liqPrice")),
                     "position_value": _f(r.get("positionValue")),
-            })
+                }
+            )
         return out
 
     async def get_account_summary(self, account_type: str = "UNIFIED") -> dict:
-        resp = await self._run(
+        resp = await self._request_signed(
-            self._http.get_wallet_balance, accountType=account_type
+            "GET",
+            "/v5/account/wallet-balance",
+            params={"accountType": account_type},
         )
         rows = (resp.get("result") or {}).get("list") or []
         if not rows:
@@ -298,11 +456,13 @@ class BybitClient:
         a = rows[0]
         coins = []
         for c in a.get("coin") or []:
-            coins.append({
+            coins.append(
+                {
                     "coin": c.get("coin"),
                     "wallet_balance": _f(c.get("walletBalance")),
                     "equity": _f(c.get("equity")),
-            })
+                }
+            )
         return {
             "account_type": a.get("accountType"),
             "equity": _f(a.get("totalEquity")),
@@ -316,8 +476,10 @@ class BybitClient:
     async def get_trade_history(
         self, category: str = "linear", limit: int = 50
     ) -> list[dict]:
-        resp = await self._run(
+        resp = await self._request_signed(
-            self._http.get_executions, category=category, limit=limit
+            "GET",
+            "/v5/execution/list",
+            params={"category": category, "limit": limit},
         )
         rows = (resp.get("result") or {}).get("list") or []
         return [
@@ -339,12 +501,14 @@ class BybitClient:
         symbol: str | None = None,
         settle_coin: str = "USDT",
     ) -> list[dict]:
-        kwargs: dict[str, Any] = {"category": category}
+        params: dict[str, Any] = {"category": category}
         if category in ("linear", "inverse") and not symbol:
-            kwargs["settleCoin"] = settle_coin
+            params["settleCoin"] = settle_coin
         if symbol:
-            kwargs["symbol"] = symbol
+            params["symbol"] = symbol
-        resp = await self._run(self._http.get_open_orders, **kwargs)
+        resp = await self._request_signed(
+            "GET", "/v5/order/realtime", params=params
+        )
         rows = (resp.get("result") or {}).get("list") or []
         return [
             {
@@ -360,15 +524,20 @@ class BybitClient:
             for r in rows
         ]
 
+    # ── microstructure / basis ─────────────────────────────────
+
     async def get_orderbook_imbalance(
         self,
         symbol: str,
         category: str = "linear",
         depth: int = 10,
     ) -> dict:
-        """Microstructure: bid/ask imbalance ratio + microprice + slope."""
+        ob = await self.get_orderbook(
-        ob = await self.get_orderbook(symbol=symbol, category=category, limit=max(depth, 50))
+            symbol=symbol, category=category, limit=max(depth, 50)
-        result = micro.orderbook_imbalance(ob.get("bids") or [], ob.get("asks") or [], depth=depth)
+        )
+        result = micro.orderbook_imbalance(
+            ob.get("bids") or [], ob.get("asks") or [], depth=depth
+        )
         return {
             "symbol": symbol,
             "category": category,
@@ -378,9 +547,6 @@ class BybitClient:
         }
 
     async def get_basis_term_structure(self, asset: str) -> dict:
-        """Basis curve futures (dated) vs perp + spot. Filtra contratti future
-        BTCUSDT / ETHUSDT con scadenza, calcola annualized basis per ognuno.
-        """
         import datetime as _dt
 
         asset = asset.upper()
@@ -389,12 +555,13 @@ class BybitClient:
         sp = spot.get("last_price")
         pp = perp.get("last_price")
 
-        # Lista futures dated (linear/inverse)
         instr = await self.get_instruments(category="linear")
-        items = (instr.get("instruments") or [])
+        items = instr.get("instruments") or []
         futures = [
-            x for x in items
+            x
-            if x.get("symbol", "").startswith(f"{asset}-") or x.get("symbol", "").startswith(f"{asset}USDT-")
+            for x in items
+            if x.get("symbol", "").startswith(f"{asset}-")
+            or x.get("symbol", "").startswith(f"{asset}USDT-")
         ]
 
         rows: list[dict[str, Any]] = []
@@ -409,21 +576,25 @@ class BybitClient:
                 days = max((int(expiry_ms) - now_ms) / 86_400_000, 1)
                 basis_pct = 100.0 * (fp - sp) / sp
                 annualized = basis_pct * 365.0 / days
-                rows.append({
+                rows.append(
+                    {
                         "symbol": f["symbol"],
                         "expiry_ms": int(expiry_ms),
                         "days_to_expiry": round(days, 2),
                         "future_price": fp,
                         "basis_pct": round(basis_pct, 4),
                         "annualized_basis_pct": round(annualized, 4),
-                })
+                    }
+                )
 
         rows.sort(key=lambda r: r["days_to_expiry"])
         return {
             "asset": asset,
             "spot_price": sp,
             "perp_price": pp,
-            "perp_basis_pct": round(100.0 * (pp - sp) / sp, 4) if (sp and pp) else None,
+            "perp_basis_pct": round(100.0 * (pp - sp) / sp, 4)
+            if (sp and pp)
+            else None,
             "term_structure": rows,
             "data_timestamp": _dt.datetime.now(_dt.UTC).isoformat(),
         }
@@ -449,11 +620,7 @@ class BybitClient:
             "funding_rate": perp.get("funding_rate"),
         }
 
-    def _envelope(self, resp: dict, payload: dict) -> dict:
+    # ── trading (signed, write) ────────────────────────────────
-        code = resp.get("retCode", 0)
-        if code != 0:
-            return {"error": resp.get("retMsg", "bybit_error"), "code": code}
-        return payload
 
     async def place_order(
         self,
@@ -467,7 +634,7 @@ class BybitClient:
         reduce_only: bool = False,
         position_idx: int | None = None,
     ) -> dict:
-        kwargs: dict[str, Any] = {
+        body: dict[str, Any] = {
             "category": category,
             "symbol": symbol,
             "side": side,
@@ -477,38 +644,34 @@ class BybitClient:
             "reduceOnly": reduce_only,
         }
         if price is not None:
-            kwargs["price"] = str(price)
+            body["price"] = str(price)
         if position_idx is not None:
-            kwargs["positionIdx"] = position_idx
+            body["positionIdx"] = position_idx
         if category == "option":
-            import uuid
+            body["orderLinkId"] = f"cerbero-{uuid.uuid4().hex[:16]}"
-            kwargs["orderLinkId"] = f"cerbero-{uuid.uuid4().hex[:16]}"
+        resp = await self._request_signed("POST", "/v5/order/create", body=body)
-        resp = await self._run(self._http.place_order, **kwargs)
         r = resp.get("result") or {}
-        return self._envelope(resp, {
+        return self._envelope(
+            resp,
+            {
                 "order_id": r.get("orderId"),
                 "order_link_id": r.get("orderLinkId"),
                 "status": "submitted",
-        })
+            },
+        )
 
     async def place_combo_order(
         self,
         category: str,
         legs: list[dict[str, Any]],
     ) -> dict:
-        """Atomic multi-leg via /v5/order/create-batch (Bybit option only).
-
-        Bybit supporta batch_order solo su category='option'. Per perp/linear
-        usare loop di place_order (non atomic).
-
-        legs: [{symbol, side, qty, order_type, price?, tif?, reduce_only?}].
-        """
         if category != "option":
-            raise ValueError("place_combo_order: Bybit batch_order è disponibile solo su category='option'")
+            raise ValueError(
+                "place_combo_order: Bybit batch_order è disponibile solo su category='option'"
+            )
         if len(legs) < 2:
             raise ValueError("combo requires at least 2 legs")
 
-        import uuid
         request: list[dict[str, Any]] = []
         for leg in legs:
             entry: dict[str, Any] = {
@@ -524,7 +687,10 @@ class BybitClient:
                 entry["price"] = str(leg["price"])
             request.append(entry)
 
-        resp = await self._run(self._http.place_batch_order, category=category, request=request)
+        body = {"category": category, "request": request}
+        resp = await self._request_signed(
+            "POST", "/v5/order/create-batch", body=body
+        )
         result_list = (resp.get("result") or {}).get("list") or []
         orders = [
             {
@@ -544,80 +710,112 @@ class BybitClient:
         new_qty: float | None = None,
         new_price: float | None = None,
     ) -> dict:
-        kwargs: dict[str, Any] = {
+        body: dict[str, Any] = {
             "category": category,
             "symbol": symbol,
             "orderId": order_id,
         }
         if new_qty is not None:
-            kwargs["qty"] = str(new_qty)
+            body["qty"] = str(new_qty)
         if new_price is not None:
-            kwargs["price"] = str(new_price)
+            body["price"] = str(new_price)
-        resp = await self._run(self._http.amend_order, **kwargs)
+        resp = await self._request_signed("POST", "/v5/order/amend", body=body)
         r = resp.get("result") or {}
-        return self._envelope(resp, {
+        return self._envelope(
+            resp,
+            {
                 "order_id": r.get("orderId", order_id),
                 "status": "amended",
-        })
+            },
-
-    async def cancel_order(
-        self, category: str, symbol: str, order_id: str
-    ) -> dict:
-        resp = await self._run(
-            self._http.cancel_order,
-            category=category, symbol=symbol, orderId=order_id,
         )
+
+    async def cancel_order(self, category: str, symbol: str, order_id: str) -> dict:
+        body = {"category": category, "symbol": symbol, "orderId": order_id}
+        resp = await self._request_signed("POST", "/v5/order/cancel", body=body)
         r = resp.get("result") or {}
-        return self._envelope(resp, {
+        return self._envelope(
+            resp,
+            {
                 "order_id": r.get("orderId", order_id),
                 "status": "cancelled",
-        })
+            },
+        )
 
     async def cancel_all_orders(
         self, category: str, symbol: str | None = None
     ) -> dict:
-        kwargs: dict[str, Any] = {"category": category}
+        body: dict[str, Any] = {"category": category}
         if symbol:
-            kwargs["symbol"] = symbol
+            body["symbol"] = symbol
-        resp = await self._run(self._http.cancel_all_orders, **kwargs)
+        resp = await self._request_signed(
+            "POST", "/v5/order/cancel-all", body=body
+        )
         r = resp.get("result") or {}
         ids = [x.get("orderId") for x in (r.get("list") or [])]
-        return self._envelope(resp, {
+        return self._envelope(
+            resp,
+            {
                 "cancelled_ids": ids,
                 "count": len(ids),
-        })
+            },
+        )
 
     async def set_stop_loss(
-        self, category: str, symbol: str, stop_loss: float,
+        self,
+        category: str,
+        symbol: str,
+        stop_loss: float,
         position_idx: int = 0,
     ) -> dict:
-        resp = await self._run(
+        body = {
-            self._http.set_trading_stop,
+            "category": category,
-            category=category, symbol=symbol,
+            "symbol": symbol,
-            stopLoss=str(stop_loss), positionIdx=position_idx,
+            "stopLoss": str(stop_loss),
+            "positionIdx": position_idx,
+        }
+        resp = await self._request_signed(
+            "POST", "/v5/position/trading-stop", body=body
         )
-        return self._envelope(resp, {
+        return self._envelope(
-            "symbol": symbol, "stop_loss": stop_loss,
+            resp,
+            {
+                "symbol": symbol,
+                "stop_loss": stop_loss,
                 "status": "stop_loss_set",
-        })
+            },
+        )
 
     async def set_take_profit(
-        self, category: str, symbol: str, take_profit: float,
+        self,
+        category: str,
+        symbol: str,
+        take_profit: float,
         position_idx: int = 0,
     ) -> dict:
-        resp = await self._run(
+        body = {
-            self._http.set_trading_stop,
+            "category": category,
-            category=category, symbol=symbol,
+            "symbol": symbol,
-            takeProfit=str(take_profit), positionIdx=position_idx,
+            "takeProfit": str(take_profit),
+            "positionIdx": position_idx,
+        }
+        resp = await self._request_signed(
+            "POST", "/v5/position/trading-stop", body=body
         )
-        return self._envelope(resp, {
+        return self._envelope(
-            "symbol": symbol, "take_profit": take_profit,
+            resp,
+            {
+                "symbol": symbol,
+                "take_profit": take_profit,
                 "status": "take_profit_set",
-        })
+            },
+        )
 
     async def close_position(self, category: str, symbol: str) -> dict:
         positions = await self.get_positions(category=category)
-        target = next((p for p in positions if p["symbol"] == symbol and (p["size"] or 0) > 0), None)
+        target = next(
+            (p for p in positions if p["symbol"] == symbol and (p["size"] or 0) > 0),
+            None,
+        )
         if not target:
             return {"error": "no_open_position", "symbol": symbol}
         close_side = "Sell" if target["side"] == "Buy" else "Buy"
@@ -634,28 +832,44 @@ class BybitClient:
     async def set_leverage(
         self, category: str, symbol: str, leverage: int
     ) -> dict:
-        resp = await self._run(
+        body = {
-            self._http.set_leverage,
+            "category": category,
-            category=category, symbol=symbol,
+            "symbol": symbol,
-            buyLeverage=str(leverage), sellLeverage=str(leverage),
+            "buyLeverage": str(leverage),
+            "sellLeverage": str(leverage),
+        }
+        resp = await self._request_signed(
+            "POST", "/v5/position/set-leverage", body=body
         )
-        return self._envelope(resp, {
+        return self._envelope(
-            "symbol": symbol, "leverage": leverage,
+            resp,
+            {
+                "symbol": symbol,
+                "leverage": leverage,
                 "status": "leverage_set",
-        })
+            },
+        )
 
     async def switch_position_mode(
         self, category: str, symbol: str, mode: str
     ) -> dict:
         mode_code = 3 if mode.lower() == "hedge" else 0
-        resp = await self._run(
+        body = {
-            self._http.switch_position_mode,
+            "category": category,
-            category=category, symbol=symbol, mode=mode_code,
+            "symbol": symbol,
+            "mode": mode_code,
+        }
+        resp = await self._request_signed(
+            "POST", "/v5/position/switch-mode", body=body
         )
-        return self._envelope(resp, {
+        return self._envelope(
-            "symbol": symbol, "mode": mode,
+            resp,
+            {
+                "symbol": symbol,
+                "mode": mode,
                 "status": "mode_switched",
-        })
+            },
+        )
 
     async def transfer_asset(
         self,
@@ -664,19 +878,23 @@ class BybitClient:
         from_type: str,
         to_type: str,
     ) -> dict:
-        import uuid
+        body = {
-        resp = await self._run(
+            "transferId": str(uuid.uuid4()),
-            self._http.create_internal_transfer,
+            "coin": coin,
-            transferId=str(uuid.uuid4()),
+            "amount": str(amount),
-            coin=coin,
+            "fromAccountType": from_type,
-            amount=str(amount),
+            "toAccountType": to_type,
-            fromAccountType=from_type,
+        }
-            toAccountType=to_type,
+        resp = await self._request_signed(
+            "POST", "/v5/asset/transfer/inter-transfer", body=body
         )
         r = resp.get("result") or {}
-        return self._envelope(resp, {
+        return self._envelope(
+            resp,
+            {
                 "transfer_id": r.get("transferId"),
                 "coin": coin,
                 "amount": amount,
                 "status": "submitted",
-        })
+            },
+        )

tests/unit/exchanges/bybit/conftest.py

@@ -1,21 +1,18 @@
 from __future__ import annotations
 
-from unittest.mock import MagicMock
-
 import pytest
 from cerbero_mcp.exchanges.bybit.client import BybitClient
 
 
 @pytest.fixture
-def mock_http():
+def client():
-    return MagicMock(name="pybit_HTTP")
+    """BybitClient con base_url testnet e AsyncClient interno.
 
-
+    pytest-httpx intercetta le chiamate dell'AsyncClient httpx creato dal
-@pytest.fixture
+    costruttore (auto-mock), quindi non serve injection esplicita.
-def client(mock_http):
+    """
     return BybitClient(
         api_key="test_key",
         api_secret="test_secret",
         testnet=True,
-        http=mock_http,
     )

tests/unit/test_exchanges_builder.py

@@ -29,15 +29,8 @@ async def test_build_client_bybit_returns_correct_env(monkeypatch):
     for k, v in _minimal_env().items():
         monkeypatch.setenv(k, v)
 
-    # Stub pybit HTTP per evitare connessione reale durante __init__
+    # BybitClient costruisce internamente httpx.AsyncClient: nessuna
-    from cerbero_mcp.exchanges.bybit import client as bybit_client
+    # connessione reale finché non si invoca un metodo di rete.
-
-    class _FakeHTTP:
-        def __init__(self, **kwargs):
-            self.kwargs = kwargs
-
-    monkeypatch.setattr(bybit_client, "HTTP", _FakeHTTP)
-
     from cerbero_mcp.exchanges import build_client
     from cerbero_mcp.settings import Settings
 
@@ -78,28 +71,22 @@ async def test_build_client_alpaca_returns_correct_env(monkeypatch):
     for k, v in _minimal_env().items():
         monkeypatch.setenv(k, v)
 
-    # Stub alpaca SDK clients per evitare connessioni reali in __init__
+    # AlpacaClient (V2) usa httpx puro: il costruttore non apre connessioni
-    from cerbero_mcp.exchanges.alpaca import client as alpaca_client
+    # reali (httpx.AsyncClient è lazy fino alla prima request), quindi nessuno
-
+    # stub SDK è necessario.
-    class _FakeSdk:
-        def __init__(self, **kwargs):
-            self.kwargs = kwargs
-
-    monkeypatch.setattr(alpaca_client, "TradingClient", _FakeSdk)
-    monkeypatch.setattr(alpaca_client, "StockHistoricalDataClient", _FakeSdk)
-    monkeypatch.setattr(alpaca_client, "CryptoHistoricalDataClient", _FakeSdk)
-    monkeypatch.setattr(alpaca_client, "OptionHistoricalDataClient", _FakeSdk)
-
     from cerbero_mcp.exchanges import build_client
     from cerbero_mcp.settings import Settings
 
     s = Settings()
     c_test = await build_client(s, "alpaca", "testnet")
     c_live = await build_client(s, "alpaca", "mainnet")
-
+    try:
         assert c_test is not c_live
         assert c_test.paper is True
         assert c_live.paper is False
+    finally:
+        await c_test.aclose()
+        await c_live.aclose()
 
 
 @pytest.mark.asyncio
@@ -202,8 +189,8 @@ async def test_hyperliquid_url_from_env_overrides_default(monkeypatch):
 
 @pytest.mark.asyncio
 async def test_bybit_url_from_env_overrides_default(monkeypatch):
-    """Bybit: pybit non accetta `endpoint` come kwarg, ma setting di
+    """Bybit (httpx): override BYBIT_URL_TESTNET applica direttamente a
-    `_http.endpoint` post-init rispecchia l'override."""
+    `self.base_url`, usato come base di ogni richiesta REST V5."""
     from tests.unit.test_settings import _minimal_env
 
     env = _minimal_env(BYBIT_URL_TESTNET="https://bybit-custom.example.com")
@@ -216,14 +203,12 @@ async def test_bybit_url_from_env_overrides_default(monkeypatch):
     s = Settings()
     c = await build_client(s, "bybit", "testnet")
     assert c.base_url == "https://bybit-custom.example.com"
-    # override applicato all'istanza pybit HTTP via attributo `endpoint`
-    assert getattr(c._http, "endpoint", None) == "https://bybit-custom.example.com"
 
 
 @pytest.mark.asyncio
 async def test_alpaca_url_from_env_overrides_default(monkeypatch):
-    """Alpaca: TradingClient supporta url_override per trading API.
+    """Alpaca V2 (httpx): `base_url` override applica al solo trading
-    Data clients (Stock/Crypto/Option) non supportano override sul costruttore."""
+    endpoint; data endpoints (data.alpaca.markets) restano hardcoded."""
     from tests.unit.test_settings import _minimal_env
 
     env = _minimal_env(ALPACA_URL_TESTNET="https://alpaca-custom.example.com")
@@ -235,7 +220,10 @@ async def test_alpaca_url_from_env_overrides_default(monkeypatch):
 
     s = Settings()
     c = await build_client(s, "alpaca", "testnet")
+    try:
         assert c.base_url == "https://alpaca-custom.example.com"
+    finally:
+        await c.aclose()
 
 
 @pytest.mark.asyncio