Price updates

offer.price.changed fires when any price field on an offer changes. Use it for a price-drop alert. Subscribe to the product from Setup, not to an offer. Leave domains off and a price change at any merchant comes through. Each event names that merchant in subject.domain. Pass domains when you only want to hear about certain merchants. previous and current are the price before and after.

{
  "id": "3b7f1c2d4e5a6b8c9d0e1f2a3b4c5d6e7f8a9b0c",
  "timestamp": "2026-10-25T14:03:11.592000+00:00",
  "type": "offer.price.changed",
  "data": {
    "subscription_id": "01JZK3V1M0T4QF3Y3Z0E5T6V7W",
    "subject": {
      "product_id": "2yh8WH5",
      "domain": "nike.com",
      "locale": { "language": "en", "country": "US", "currency": "USD" },
      "selection": null
    },
    "previous": {
      "price": 189.99,
      "compare_at_price": null,
      "currency": "USD"
    },
    "current": {
      "price": 149.99,
      "compare_at_price": 189.99,
      "currency": "USD"
    }
  }
}

data.subject names the offer. The id stays the same when a delivery is retried.

Payload reference

Full schema for offer.price.changed.

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Payload reference