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Documentation Index

Fetch the complete documentation index at: https://polynode.mintlify.app/llms.txt

Use this file to discover all available pages before exploring further.

Real-time crypto price data. Updates arrive approximately once per second per feed, streamed directly over WebSocket. Subscribe with "type": "chainlink" to receive price feed events.
For the full guide including all 7 available feeds, filtering, and examples, see the Crypto Prices section.
{
  "type": "price_feed",
  "feed": "BTC/USD",
  "timestamp": 1774672089,
  "data": {
    "feed": "BTC/USD",
    "price": 66236.61,
    "bid": 66229.77,
    "ask": 66237.94,
    "timestamp": 1774672089
  }
}

​
Subscribing

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

​
Response

{
  "type": "subscribed",
  "subscriber_id": "550e8400-e29b-41d4-a716-446655440000",
  "subscription_type": "chainlink"
}
Price feed subscriptions do not include a snapshot. Events start arriving with the next price observation (~1 second).

​
Fields

​
type
string
required
Always "price_feed".
​
feed
string
required
Feed name (e.g. "BTC/USD", "ETH/USD").
​
timestamp
number
required
Observation timestamp in Unix seconds.
​
data
object
required

​
Available feeds

FeedUpdate rate
BTC/USD~1/second
ETH/USD~1/second
SOL/USD~1/second
BNB/USD~1/second
XRP/USD~1/second
DOGE/USD~1/second
HYPE/USD~1/second
See Available Feeds for detailed per-feed documentation.

​
Dual subscription

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.