merge: chore/cleanup-remove-bloat-and-secrets into main

app/routers/mev_advisory.py

@@ -0,0 +1,79 @@
+"""MEV Protection Advisory — warns users before trading in sandwich-prone pools."""
+
+import os
+
+import httpx
+from fastapi import APIRouter, Query
+
+router = APIRouter(prefix="/api/v1/mev-advisory", tags=["mev-advisory"])
+
+BACKEND = os.getenv("BACKEND_URL", "http://localhost:8000")
+RMI_KEY = os.getenv("RMI_INTERNAL_KEY", "rmi-internal-2026")
+
+
+@router.get("/check/{address}")
+async def check_mev_risk(address: str, chain: str = Query("ethereum")):
+    """Check MEV risk before trading a token. Returns sandwich attack risk and protection recommendation."""
+    async with httpx.AsyncClient(timeout=15) as c:
+        # Use existing MEV sandwich detector
+        r = await c.get(f"{BACKEND}/api/v1/databus/premium/mev/{address}?chain={chain}", headers={"X-RMI-Key": RMI_KEY})
+
+        mev_data = {}
+        if r.status_code == 200:
+            mev_data = r.json().get("data", r.json())
+
+        sandwich_count = mev_data.get("sandwich_attacks_24h", 0)
+        frontrun_count = mev_data.get("frontrun_count", 0)
+
+        if sandwich_count > 10:
+            risk = "CRITICAL"
+            recommendation = "This pool has heavy MEV activity. Use Flashbots Protect or MEV Blocker for this trade."
+            emoji = "🔴"
+        elif sandwich_count > 3:
+            risk = "HIGH"
+            recommendation = "Moderate sandwich risk detected. Consider MEV protection or lower slippage."
+            emoji = "🟡"
+        elif sandwich_count > 0:
+            risk = "LOW"
+            recommendation = "Minor MEV activity. Standard slippage should be fine."
+            emoji = "🟢"
+        else:
+            risk = "SAFE"
+            recommendation = "No recent sandwich attacks detected. Safe to trade normally."
+            emoji = "🟢"
+
+    return {
+        "token": address,
+        "chain": chain,
+        "mev_risk": risk,
+        "emoji": emoji,
+        "sandwich_attacks_24h": sandwich_count,
+        "frontrun_attacks_24h": frontrun_count,
+        "recommendation": recommendation,
+        "mev_protection_tools": ["Flashbots Protect", "MEV Blocker", "Eden Network"]
+        if risk in ("CRITICAL", "HIGH")
+        else [],
+    }
+
+
+@router.get("/safe-swap")
+async def safe_swap_params(address: str, chain: str = "ethereum", amount_usd: float = Query(100, ge=1)):
+    """Get optimal swap parameters to avoid MEV."""
+    risk = await check_mev_risk(address, chain)
+
+    if risk["mev_risk"] in ("CRITICAL", "HIGH"):
+        slippage = 0.5
+        use_flashbots = True
+    else:
+        slippage = 1.0
+        use_flashbots = False
+
+    return {
+        "token": address,
+        "chain": chain,
+        "recommended_slippage_pct": slippage,
+        "use_mev_protection": use_flashbots,
+        "gas_tip_gwei": 2 if use_flashbots else 1,
+        "mev_risk": risk["mev_risk"],
+        "note": risk["recommendation"],
+    }