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GET
Stream listing updates (SSE)

Overview

Opens a Server-Sent Events (SSE) stream for a single listing. The stream delivers cached data immediately, then attempts a live fetch for the freshest data available. Tier requirement: Pro, Business, or Internal.

SSE Events

Example

Behavior

  • The cached event is always sent first (from D1 database)
  • The live event is sent if the live fetch succeeds (typically 2-5 seconds)
  • If the live fetch fails or times out, an error event is sent instead of live
  • The stream always ends with a done event
  • Total stream duration is typically under 10 seconds

When to use

This endpoint is designed for one-time fresh data retrieval. For ongoing monitoring, use persistent watchers instead. Note: Business and Internal tier users get live data automatically on the regular GET /v1/property/{id} endpoint (returned with "source": "live"), so the SSE stream is primarily useful for Pro tier users who want live data.

Authorizations

Authorization
string
header
required

Polar.sh license key. Format: BOROUGH-<uuid>

Path Parameters

id
string
required

Listing ID

Response

Server-Sent Events stream

The response is of type string.