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slotsUpdatesSubscribe RPC Method

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Updated on
May 01, 2026

slotsUpdatesSubscribe 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.
The Solana Kit example uses createSolanaRpcSubscriptions_UNSTABLE because the Kit API for slot update subscriptions is currently experimental and the implementation may change. The slotsUpdatesSubscribe method itself is fully supported by the Quicknode WebSocket API.

Parameters

This method does not accept any parameters

Returns

slotsUpdatesNotification
object
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slot
integer
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timestamp
integer
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type
string
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stats
object
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numTransactionEntries
integer
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numSuccessfulTransactions
integer
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numFailedTransactions
integer
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maxTransactionsPerEntry
integer
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Request
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import { createSolanaRpcSubscriptions_UNSTABLE } from '@solana/kit';
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const rpcSubscriptions = createSolanaRpcSubscriptions_UNSTABLE('');
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async function main() {
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    const abortController = new AbortController();
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    const slotsUpdatesNotification = await rpcSubscriptions
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        .slotsUpdatesNotifications()
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        .subscribe({ abortSignal: abortController.signal });
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    try {
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        for await (const notification of slotsUpdatesNotification) {
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            console.log('type:', notification.type);
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            console.log('slot:', notification.slot);
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            console.log('timestamp:', notification.timestamp);
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        }
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    } catch (e) {
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        console.error(e);
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    } finally {
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        abortController.abort();
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        console.log('Unsubscribed from slot updates');
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    }
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}
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main();
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import { createSolanaRpcSubscriptions_UNSTABLE } from '@solana/kit';
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const rpcSubscriptions = createSolanaRpcSubscriptions_UNSTABLE('');
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async function main() {
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    const abortController = new AbortController();
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    const slotsUpdatesNotification = await rpcSubscriptions
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        .slotsUpdatesNotifications()
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        .subscribe({ abortSignal: abortController.signal });
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    try {
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        for await (const notification of slotsUpdatesNotification) {
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            console.log('type:', notification.type);
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            console.log('slot:', notification.slot);
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            console.log('timestamp:', notification.timestamp);
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        }
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    } catch (e) {
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        console.error(e);
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    } finally {
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        abortController.abort();
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        console.log('Unsubscribed from slot updates');
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    }
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}
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main();
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Response
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{
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  "jsonrpc": "2.0",
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  "result": 0,
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  "id": 1
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}
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{
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  "jsonrpc": "2.0",
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  "result": 0,
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  "id": 1
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}
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