Recipe: Price Drop Alert

Get notified when an e-commerce product drops in price by more than 5%.

curl -X POST https://api.verid.dev/v1/monitors \
  -H "Authorization: Bearer $VERID_API_KEY" \
  -d '{
    "name": "Nike Air Max Price Alert",
    "url": "https://www.nike.com/t/air-max-90-shoes",
    "schedule_interval_seconds": 3600,
    "extract_config": {
      "method": "css",
      "fields": {
        "price": "[data-test=product-price]",
        "title": "h1"
      }
    },
    "diff_predicate": {
      "type": "field_decreases_by_percent",
      "field": "price",
      "threshold": 5
    },
    "deliveries": [
      { "type": "webhook", "url": "https://your-app.com/hooks/price-drop" }
    ]
  }'

Note: The field_decreases_by_percent predicate only works with numeric values. CSS-extracted prices that include a currency symbol like "$49.99" parse as NaN and will not trigger. Use a site that returns a raw number, switch to JSONPath against the site's product API, or pair with LLM extraction to normalize prices to numbers.

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