State-Aware Watchers

Watch any API or webpage.
Alert only when it changes.

Stateless cron jobs spam you every run. LiteLambda gives your Python script persistent Key-Value storage so you can compare current vs previous values and only alert on real deltas.

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Traditional Stateless Cron

Spams on Every Execution

Lacks memory. Every 15 minutes it checks the price, sees it's $99, and sends an alert. You wake up to 96 identical messages in Slack.

# Run 1: Sends Slack message ($99)
# Run 2: Sends Slack message ($99)
# Run 3: Sends Slack message ($99)
LiteLambda with Built-in KV

Alerts Only When Changed

Saves state to context.kv. Compares current value against last run. Only fires webhooks when price drops or conditions match.

# Run 1: Saves $99 to KV (Silent)
# Run 2: Still $99 → Skipped
# Run 3: Price dropped to $79 → 🔥 ALERT SENT
price_monitor.py • Automatic pip packages included Runs Every 15 Mins 
import requests, os

def handler(event, context):
    # 1. Fetch current price from target API
    data = requests.get("https://api.coingecko.com/api/v3/simple/price?ids=bitcoin&vs_currencies=usd").json()
    current_price = data["bitcoin"]["usd"]
    
    # 2. Retrieve previous value from built-in KV Store
    last_price = context.kv.get("last_btc_price", current_price)
    
    # 3. Calculate percentage difference
    diff = ((current_price - last_price) / last_price) * 100
    
    if abs(diff) >= 2.0:
        msg = f"🚨 BTC moved {diff:+.2f}%! Current: ${current_price:,.2f}"
        requests.post(os.environ["TELEGRAM_ALERT_URL"], json={"text": msg})
        
    # 4. Save state for next execution
    context.kv.set("last_btc_price", current_price)
    return {"price": current_price, "delta_pct": diff}

Native Failure & Alert Integrations

Receive instant notifications with stack traces when your watchers throw errors or selectors break.

Discord Webhook alerts
Telegram Bot notifications
Slack Incoming webhooks
Email Instant stack traces

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