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

{
  "jsonrpc": "2.0",
  "result": 0,
  "id": 1
}
This subscription is unstable. The format of this subscription may change in the future, and may not always be supported.

​
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:
  • err: <string|undefined> - The error message. Only present if the update is of type “dead”.
  • parent: <u64|undefined> - The parent slot. Only present if the update is of type “createdBank”.
  • slot: <u64> - The newly updated slot
  • stats: <object|undefined> - Only present if the update is of type “frozen”. An object with the following fields:
    • maxTransactionsPerEntry: <u64>
    • numFailedTransactions: <u64>
    • numSuccessfulTransactions: <u64>
    • numTransactionEntries: <u64>
  • timestamp: <i64> - The Unix timestamp of the update in milliseconds
  • type: <string> - The update type, one of:
    • “firstShredReceived”
    • “completed”
    • “createdBank”
    • “frozen”
    • “dead”
    • “optimisticConfirmation”
    • “root”
{
  "jsonrpc": "2.0",
  "id": 1,
  "method": "slotsUpdatesSubscribe"
}

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