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Parameters

  • publicKey - The program ID (public key) to monitor, as a base-58 encoded string

  • <config> - (optional) Configuration object:

    • encoding - Data encoding for the account data:

      • "base58" - Base-58 encoding (default)
      • "base64" - Base-64 encoding
      • "base64+zstd" - Compressed Base-64 encoding
      • "jsonParsed" - JSON format (if program supports it)

    • filters - (optional) Array of filter objects:

      • memcmp - Filter for memory comparison:

        • offset - Number of bytes into program account to start comparison
        • bytes - Data to match, as base-58 encoded string

      • dataSize - Filter for program account data size

    • commitment - (optional) The level of commitment desired when querying state. Default is “finalized”.

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Response

  • result - An integer subscription id (needed to unsubscribe)

  • subscription - An object containing account information:

    • pubkey - The public key of the account that changed

    • account - Account information:

      • lamports - Number of lamports assigned to the account
      • owner - Base-58 encoded public key of the program this account is assigned to
      • data - Account data, encoded according to specified encoding parameter
      • executable - Boolean indicating if the account contains a program
      • rentEpoch - The epoch at which this account will next owe rent

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programSubscribe code examples

This example subscribes to all accounts owned by the pump.fun program.

Note that subscriptions require a WebSocket connection and WebSocket cat for you to use this method in the console.

Install WebSocket cat with:

npm install -g wscat

$ wscat -c YOUR_CHAINSTACK_WEBSOCKET_ENDPOINT

# Wait for the connection to be established



Connected (press CTRL+C to quit)



> {"jsonrpc":"2.0","id":1,"method":"programSubscribe","params":["6EF8rrecthR5Dkzon8Nwu78hRvfCKubJ14M5uBEwF6P",{"encoding":"jsonParsed","commitment":"finalized"}]}

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Use case

The programSubscribe method is particularly useful for applications that need to monitor all accounts associated with a specific program. Common use cases include:

  • DEX monitoring: Track changes to orderbooks, market states, and other trading-related accounts
  • Token tracking: Monitor token program accounts for transfers and balance changes
  • Gaming: Track game state changes across all player accounts
  • DeFi applications: Monitor lending pools, staking positions, and other DeFi-related accounts
  • Analytics platforms: Gather real-time data about program usage and account state changes

By subscribing to program account changes, applications can provide real-time updates and analytics without constantly polling the blockchain for changes to individual accounts.