The logsSubscribe method opens a stream that emits a notification any time a transaction is committed and its logs match the supplied filter. Pair it with logsUnsubscribe to stop receiving notifications.

Parameters

• filter: filter criteria for log subscriptions. Accepts one of:

  • "all" - subscribe to all transactions except simple vote transactions.
  • "allWithVotes" - subscribe to all transactions including simple vote transactions.
  • An object: { "mentions": ["<pubkey>"] } - subscribe to transactions that mention exactly one of the provided base-58 encoded pubkeys.

• config (optional): object - Configuration object containing:

  • commitment: string - The commitment level. One of processed, confirmed, finalized. Defaults to finalized.

Request

// initiate websocket stream first
wscat -c wss://solana-mainnet.g.alchemy.com/v2/<-- ALCHEMY APP API KEY -->
 
// then call subscription
{"jsonrpc":"2.0","id":1,"method":"logsSubscribe","params":[{"mentions":["11111111111111111111111111111111"]},{"commitment":"finalized"}]}

import { Connection, PublicKey } from '@solana/web3.js'
 
const connection = new Connection(
  'https://solana-mainnet.g.alchemy.com/v2/<-- ALCHEMY APP API KEY -->',
  {
    wsEndpoint: 'wss://solana-mainnet.g.alchemy.com/v2/<-- ALCHEMY APP API KEY -->',
    commitment: 'finalized'
  }
)
 
const subscriptionId = connection.onLogs(
  new PublicKey('11111111111111111111111111111111'),
  (logs, context) => {
    console.log('Logs at slot', context.slot, {
      signature: logs.signature,
      err: logs.err,
      logs: logs.logs
    })
  },
  'finalized'
)
 
// To unsubscribe later:
// await connection.removeOnLogsListener(subscriptionId)

Result

// subscribe response
{"jsonrpc":"2.0","result":24040,"id":1}
 
// notification
{
  "jsonrpc": "2.0",
  "method": "logsNotification",
  "params": {
    "result": {
      "context": { "slot": 5208469 },
      "value": {
        "signature": "5h6xBEauJ3PK6SWCZ1PGjBvj8vDdWG3KpwATGy1ARAXFSDwt8GFXM7W5Ncn16wmqokgpiKRLuS83KUxyZyv2sUYv",
        "err": null,
        "logs": [
          "Program 11111111111111111111111111111111 invoke [1]",
          "Program 11111111111111111111111111111111 success"
        ]
      }
    },
    "subscription": 24040
  }
}

Unsubscribe

Use logsUnsubscribe with the subscription id returned by logsSubscribe to cancel the stream.

• subscription_id: number - The subscription id to cancel.

{"jsonrpc":"2.0","id":1,"method":"logsUnsubscribe","params":[subscription_id]}

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

When using @solana/web3.js, call connection.removeOnLogsListener(subscriptionId) instead of sending the raw JSON-RPC request.