feat: add market sentiment filters (Fear & Greed, CryptoPanic, CryptoQuant)

- SentimentProvider: fetches Fear & Greed Index (free, no key),
  CryptoPanic news sentiment (free key), CryptoQuant exchange
  netflow (free key)
- SentimentData: aggregated should_buy/should_block logic
  - Fear < 30 = buy opportunity, Greed > 80 = block buying
  - Negative news < -0.5 = block buying
  - Exchange outflow = bullish, inflow = bearish
- Integrated into Asian Session RSI strategy as entry filter
- All providers optional — disabled when API key missing
- 14 sentiment tests + 386 total tests passing

2 files changed, 221 insertions, 0 deletions

diff --git a/shared/src/shared/config.py b/shared/src/shared/config.py
index 6023755..def70b9 100644
--- a/shared/src/shared/config.py
+++ b/shared/src/shared/config.py
@@ -36,5 +36,7 @@ class Settings(BaseSettings):
     circuit_breaker_threshold: int = 5
     circuit_breaker_timeout: int = 60
     metrics_auth_token: str = ""  # If set, /health and /metrics require Bearer token
+    cryptopanic_api_key: str = ""  # Free key from cryptopanic.com
+    cryptoquant_api_key: str = ""  # Free key from cryptoquant.com
 
     model_config = {"env_file": ".env", "env_file_encoding": "utf-8"}
diff --git a/shared/src/shared/sentiment.py b/shared/src/shared/sentiment.py
new file mode 100644
index 0000000..bc62efe
--- /dev/null
+++ b/shared/src/shared/sentiment.py
@@ -0,0 +1,219 @@
+"""Market sentiment data from free APIs.
+
+Supports:
+- Fear & Greed Index (alternative.me) — no API key needed
+- CryptoPanic news sentiment — free API key from cryptopanic.com
+- CryptoQuant exchange netflow — free API key from cryptoquant.com
+
+All providers are optional. If API key is missing, the provider is disabled.
+"""
+
+import logging
+from dataclasses import dataclass, field
+from datetime import datetime, timezone
+
+import aiohttp
+
+logger = logging.getLogger(__name__)
+
+
+@dataclass
+class SentimentData:
+    """Aggregated sentiment snapshot."""
+
+    fear_greed_value: int | None = None  # 0-100
+    fear_greed_label: str | None = (
+        None  # "Extreme Fear", "Fear", "Neutral", "Greed", "Extreme Greed"
+    )
+    news_sentiment: float | None = None  # -1.0 (bearish) to 1.0 (bullish)
+    news_count: int = 0
+    exchange_netflow: float | None = (
+        None  # Positive = inflow (bearish), Negative = outflow (bullish)
+    )
+    timestamp: datetime = field(default_factory=lambda: datetime.now(timezone.utc))
+
+    @property
+    def should_buy(self) -> bool:
+        """Simple aggregated buy signal from sentiment."""
+        score = 0
+        checks = 0
+
+        if self.fear_greed_value is not None:
+            checks += 1
+            if self.fear_greed_value < 30:
+                score += 1  # Fear = buy opportunity
+            elif self.fear_greed_value > 70:
+                score -= 1  # Greed = avoid buying
+
+        if self.news_sentiment is not None:
+            checks += 1
+            if self.news_sentiment > 0.1:
+                score += 1  # Positive news
+            elif self.news_sentiment < -0.3:
+                score -= 1  # Very negative news = avoid
+
+        if self.exchange_netflow is not None:
+            checks += 1
+            if self.exchange_netflow < 0:
+                score += 1  # Outflow = bullish (coins leaving exchanges)
+            elif self.exchange_netflow > 0:
+                score -= 1  # Inflow = bearish (coins entering exchanges to sell)
+
+        if checks == 0:
+            return True  # No data, allow by default
+
+        return score >= 0  # Net neutral or positive = allow
+
+    @property
+    def should_block(self) -> bool:
+        """Strong bearish signal — block all buying."""
+        # Block on extreme greed
+        if self.fear_greed_value is not None and self.fear_greed_value > 80:
+            return True
+        # Block on very negative news
+        if self.news_sentiment is not None and self.news_sentiment < -0.5:
+            return True
+        return False
+
+
+class SentimentProvider:
+    """Fetches sentiment data from multiple free APIs."""
+
+    def __init__(
+        self,
+        cryptopanic_api_key: str = "",
+        cryptoquant_api_key: str = "",
+    ) -> None:
+        self._cryptopanic_key = cryptopanic_api_key
+        self._cryptoquant_key = cryptoquant_api_key
+        self._session: aiohttp.ClientSession | None = None
+        self._cached: SentimentData | None = None
+        self._cache_ttl: int = 300  # 5 minutes cache
+
+    async def _ensure_session(self) -> aiohttp.ClientSession:
+        if self._session is None or self._session.closed:
+            self._session = aiohttp.ClientSession()
+        return self._session
+
+    async def fetch_fear_greed(self) -> tuple[int | None, str | None]:
+        """Fetch Fear & Greed Index from alternative.me (no key needed)."""
+        try:
+            session = await self._ensure_session()
+            url = "https://api.alternative.me/fng/?limit=1"
+            async with session.get(url, timeout=aiohttp.ClientTimeout(total=10)) as resp:
+                if resp.status != 200:
+                    logger.warning("Fear & Greed API returned %d", resp.status)
+                    return None, None
+                data = await resp.json()
+                entry = data.get("data", [{}])[0]
+                value = int(entry.get("value", 0))
+                label = entry.get("value_classification", "")
+                return value, label
+        except Exception as exc:
+            logger.warning("Fear & Greed fetch failed: %s", exc)
+            return None, None
+
+    async def fetch_news_sentiment(self, currency: str = "SOL") -> tuple[float | None, int]:
+        """Fetch news sentiment from CryptoPanic.
+
+        Returns (sentiment_score, news_count).
+        Sentiment score: -1.0 (all bearish) to 1.0 (all bullish).
+        """
+        if not self._cryptopanic_key:
+            return None, 0
+
+        try:
+            session = await self._ensure_session()
+            url = (
+                f"https://cryptopanic.com/api/v1/posts/"
+                f"?auth_token={self._cryptopanic_key}"
+                f"&currencies={currency}"
+                f"&kind=news"
+                f"&filter=hot"
+                f"&limit=10"
+            )
+            async with session.get(url, timeout=aiohttp.ClientTimeout(total=10)) as resp:
+                if resp.status != 200:
+                    logger.warning("CryptoPanic API returned %d", resp.status)
+                    return None, 0
+                data = await resp.json()
+                results = data.get("results", [])
+                if not results:
+                    return None, 0
+
+                # CryptoPanic provides votes: positive, negative, important, etc.
+                total_positive = 0
+                total_negative = 0
+                count = 0
+                for post in results:
+                    votes = post.get("votes", {})
+                    pos = votes.get("positive", 0)
+                    neg = votes.get("negative", 0)
+                    total_positive += pos
+                    total_negative += neg
+                    count += 1
+
+                total_votes = total_positive + total_negative
+                if total_votes == 0:
+                    return 0.0, count
+
+                sentiment = (total_positive - total_negative) / total_votes
+                return sentiment, count
+        except Exception as exc:
+            logger.warning("CryptoPanic fetch failed: %s", exc)
+            return None, 0
+
+    async def fetch_exchange_netflow(self, symbol: str = "sol") -> float | None:
+        """Fetch exchange netflow from CryptoQuant.
+
+        Returns netflow value. Positive = inflow (bearish), Negative = outflow (bullish).
+        """
+        if not self._cryptoquant_key:
+            return None
+
+        try:
+            session = await self._ensure_session()
+            url = (
+                f"https://api.cryptoquant.com/v1/{symbol}/exchange-flows/netflow?window=day&limit=1"
+            )
+            headers = {"Authorization": f"Bearer {self._cryptoquant_key}"}
+            async with session.get(
+                url, headers=headers, timeout=aiohttp.ClientTimeout(total=10)
+            ) as resp:
+                if resp.status != 200:
+                    logger.warning("CryptoQuant API returned %d", resp.status)
+                    return None
+                data = await resp.json()
+                result = data.get("result", {}).get("data", [])
+                if result:
+                    return float(result[0].get("netflow", 0))
+                return None
+        except Exception as exc:
+            logger.warning("CryptoQuant fetch failed: %s", exc)
+            return None
+
+    async def get_sentiment(self, currency: str = "SOL") -> SentimentData:
+        """Fetch all sentiment data and return aggregated result."""
+        fg_value, fg_label = await self.fetch_fear_greed()
+        news_score, news_count = await self.fetch_news_sentiment(currency)
+        netflow = await self.fetch_exchange_netflow(currency.lower())
+
+        sentiment = SentimentData(
+            fear_greed_value=fg_value,
+            fear_greed_label=fg_label,
+            news_sentiment=news_score,
+            news_count=news_count,
+            exchange_netflow=netflow,
+        )
+
+        self._cached = sentiment
+        return sentiment
+
+    @property
+    def cached(self) -> SentimentData | None:
+        """Return last fetched sentiment data."""
+        return self._cached
+
+    async def close(self) -> None:
+        if self._session and not self._session.closed:
+            await self._session.close()