slotSubscribe RPC Method

As of May 1, 2026, this WebSocket method is billed based on metered data usage: 0.1 MB = 15 API credits. Learn more about WebSocket billing.

Parameters

This method does not accept any parameters

Returns

result

Loading...

Notification Format:

Loading...

parent

Loading...

root

Loading...

slot

Loading...

Request

1
import { createSolanaRpcSubscriptions } from '@solana/kit';
2

3
const rpcSubscriptions = createSolanaRpcSubscriptions('');
4

5
async function main() {
6
    const abortController = new AbortController();
7
    
8
    const subscription = await rpcSubscriptions
9
        .slotNotifications()
10
        .subscribe({ abortSignal: abortController.signal });
11

12
    try {
13
        for await (const notification of subscription) {
14
            console.log("Updated slot info: ", notification);
15
        }
16
    } catch (e) {
17
        console.error(e);
18
    } finally {
19
        abortController.abort();
20
        console.log('Unsubscribed from slot changes');
21
    }
22
}
23

24
main();

1
import { createSolanaRpcSubscriptions } from '@solana/kit';
2

3
const rpcSubscriptions = createSolanaRpcSubscriptions('');
4

5
async function main() {
6
    const abortController = new AbortController();
7
    
8
    const subscription = await rpcSubscriptions
9
        .slotNotifications()
10
        .subscribe({ abortSignal: abortController.signal });
11

12
    try {
13
        for await (const notification of subscription) {
14
            console.log("Updated slot info: ", notification);
15
        }
16
    } catch (e) {
17
        console.error(e);
18
    } finally {
19
        abortController.abort();
20
        console.log('Unsubscribed from slot changes');
21
    }
22
}
23

24
main();

1
const web3 = require("@solana/web3.js");
2
(async () => {
3
  const solanaConnection = new web3.Connection("https://docs-demo.solana-mainnet.quiknode.pro/", {
4
    wsEndpoint: "",
5
  });
6
  solanaConnection.onSlotChange((slotInfo) =>
7
    console.log("Updated slot info: ", slotInfo)
8
  );
9
})();
10

1
const web3 = require("@solana/web3.js");
2
(async () => {
3
  const solanaConnection = new web3.Connection("https://docs-demo.solana-mainnet.quiknode.pro/", {
4
    wsEndpoint: "",
5
  });
6
  solanaConnection.onSlotChange((slotInfo) =>
7
    console.log("Updated slot info: ", slotInfo)
8
  );
9
})();
10

1
import solana
2
import asyncio
3
from asyncstdlib import enumerate
4
from solana.rpc.websocket_api import connect
5

6
async def main():
7
    async with connect("") as websocket:
8
        await websocket.slot_subscribe()
9
        first_resp = await websocket.recv()
10
        subscription_id = first_resp.result
11
        async for idx, msg in enumerate(websocket):
12
            print(msg)
13

14
asyncio.run(main())

1
import solana
2
import asyncio
3
from asyncstdlib import enumerate
4
from solana.rpc.websocket_api import connect
5

6
async def main():
7
    async with connect("") as websocket:
8
        await websocket.slot_subscribe()
9
        first_resp = await websocket.recv()
10
        subscription_id = first_resp.result
11
        async for idx, msg in enumerate(websocket):
12
            print(msg)
13

14
asyncio.run(main())

1
wscat -c  \ 
2
# wait for connection 
3
{"id":1,"jsonrpc":"2.0","method": "slotSubscribe" }

1
wscat -c  \ 
2
# wait for connection 
3
{"id":1,"jsonrpc":"2.0","method": "slotSubscribe" }

Response

1
{
2
  "jsonrpc": "2.0",
3
  "result": 0,
4
  "id": 1
5
}

1
{
2
  "jsonrpc": "2.0",
3
  "result": 0,
4
  "id": 1
5
}

Don't have an account yet?

Create your Quicknode endpoint in seconds and start building

Get started for free