{
  "jsonrpc": "2.0",
  "id": 1,
  "method": "slotSubscribe"
}

{
  "jsonrpc": "2.0",
  "result": 0,
  "id": 1
}

​
Endpoints

Websockets are available on mainnet and devnet with the following URLs:
  • Mainnet wss://mainnet.helius-rpc.com/?api-key=<API_KEY>
  • Devnet wss://devnet.helius-rpc.com/?api-key=<API_KEY>
Websockets have a 10-minute inactivity timer; implementing health checks and sending pings every minute is heavily recommended to keep the websocket connection alive.

​
Authorizations

​
api-key
string
required
Your Helius API key. You can get one for free in the dashboard.

​
Body

​
params
array

​
Response

​
result
integer
Subscription id (needed to unsubscribe)

​
Notification Format

The notification will be an object with the following fields:
  • parent: <u64> - The parent slot
  • root: <u64> - The current root slot
  • slot: <u64> - The newly set slot value
{
  "jsonrpc": "2.0",
  "id": 1,
  "method": "slotSubscribe"
}

{
  "jsonrpc": "2.0",
  "result": 0,
  "id": 1
}