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Real-time price data from Chainlink Data Streams. Reports arrive approximately once per second per feed, streamed directly via WebSocket (not polling). Subscribe with "type": "chainlink" to receive price feed events. 
{
  "type": "price_feed",
  "feed": "BTC/USD",
  "timestamp": 1772616170,
  "data": {
    "feed": "BTC/USD",
    "feed_id": "0x00039d9e45394f473ab1f050a1b963e6b05351e52d71e507509ada0c95ed75b8",
    "price": 71280.55,
    "bid": 71279.77,
    "ask": 71281.35,
    "timestamp": 1772616170,
    "source": "chainlink_data_streams"
  }
}

​
Subscribing

{"action": "subscribe", "type": "chainlink"}
With feed filter (only receive specific feeds): 
{
  "action": "subscribe",
  "type": "chainlink",
  "filters": {
    "feeds": ["BTC/USD"]
  }
}
Omit the feeds filter to receive all available price feeds.

​
Response

{
  "type": "subscribed",
  "subscriber_id": "550e8400-e29b-41d4-a716-446655440000",
  "subscription_type": "chainlink"
}
Chainlink subscriptions do not include a snapshot — events start arriving with the next Chainlink report (~1 second).

​
Fields

​
type
string
required
Always "price_feed".
​
feed
string
required
Human-readable feed name (e.g. "BTC/USD").
​
timestamp
number
required
Chainlink observation timestamp in Unix seconds.
​
data
object
required

​
Available feeds

FeedFeed IDCadence
BTC/USD0x00039d9e...b8~1 report/second
More feeds will be added over time. Use the feeds filter to subscribe to specific ones.

​
Dual subscription

Chainlink price feeds run on the same WebSocket connection as settlement subscriptions. Send both subscribe messages to receive both: 
{"action": "subscribe", "type": "settlements"}
{"action": "subscribe", "type": "chainlink"}
Events arrive interleaved. Use the type field ("settlement" vs "price_feed") to route them in your application.

​
Use cases

  • Portfolio valuation — combine BTC price with Polymarket positions for real-time PnL
  • Hedging signals — correlate BTC price moves with prediction market settlements
  • Dashboards — display live crypto prices alongside prediction market data
  • Trading bots — trigger Polymarket trades based on BTC price thresholds