LaserStream gRPC Quickstart

Install the SDK, pick an endpoint, and stream your first Solana transactions over LaserStream gRPC — endpoints, subscribe-request reference, and examples.

Overview

LaserStream is a managed Solana gRPC streaming service. It is wire-compatible with the open Yellowstone gRPC protocol — so any Yellowstone client works out of the box — and adds production features like historical replay, multi-node failover, and a fully managed environment.

LaserStream uses the open source gRPC protocol, ensuring no vendor lock-in and maximum compatibility with existing gRPC implementations.

You can connect either with the standard @triton-one/yellowstone-grpc client or use the performance-optimized Helius LaserStream SDK for added benefits including higher throughput, automatic reconnects, subscription management, error handling, and more.

LaserStream SDK is 40x Faster vs. JavaScript Yellowstone Clients

Learn how we used Rust Core with zero-copy NAPI bindings to maximize JavaScript SDK performance

Performance Notice: If you experience any lag or performance issues with your LaserStream connection, please refer to the Troubleshooting section for common causes and solutions.

Endpoints & Regions

LaserStream is available in multiple regions worldwide.

Choose the endpoint closest to your application for optimal performance:

Mainnet Endpoints

Region	Location	Endpoint
ewr	Newark, NJ (near New York)	https://laserstream-mainnet-ewr.helius-rpc.com
pitt	Pittsburgh, US (Central)	https://laserstream-mainnet-pitt.helius-rpc.com
slc	Salt Lake City, US (West Coast)	https://laserstream-mainnet-slc.helius-rpc.com
lax	Los Angeles, US (West Coast)	https://laserstream-mainnet-lax.helius-rpc.com
lon	London, Europe	https://laserstream-mainnet-lon.helius-rpc.com
ams	Amsterdam, Europe	https://laserstream-mainnet-ams.helius-rpc.com
fra	Frankfurt, Europe	https://laserstream-mainnet-fra.helius-rpc.com
tyo	Tokyo, Asia	https://laserstream-mainnet-tyo.helius-rpc.com
sgp	Singapore, Asia	https://laserstream-mainnet-sgp.helius-rpc.com

Devnet Endpoint

Network	Location	Endpoint
Devnet	Newark, NJ (near New York)	https://laserstream-devnet-ewr.helius-rpc.com

Network & Region Selection:

• For production apps, pick the mainnet endpoint nearest your server for best performance (e.g., if deploying in Europe, use Amsterdam (ams) or Frankfurt (fra))
• For testing, use: https://laserstream-devnet-ewr.helius-rpc.com.

zstd Compression

All LaserStream gRPC endpoints support zstd compression. Compression is opt-in: responses remain uncompressed unless your client advertises zstd support.

Enable zstd in the Helius LaserStream TypeScript SDK:

import { CompressionAlgorithms } from 'helius-laserstream'
import type { LaserstreamConfig } from 'helius-laserstream'

const config: LaserstreamConfig = {
  apiKey: 'YOUR_API_KEY',
  endpoint: 'https://laserstream-mainnet-ewr.helius-rpc.com',
  channelOptions: {
    'grpc.default_compression_algorithm': CompressionAlgorithms.zstd,
  },
}

zstd reduces network bandwidth but adds compression work. Benchmark it with your subscription workload before enabling it for latency-sensitive streams.

Log Truncation

By default, LaserStream truncates transaction log messages to 10 KB for better speed and performance. If you need full logs, dedicated untruncated endpoints are available — see Log Truncation.

Quickstart

Get started with LaserStream from your Helius Dashboard. Mainnet requires a Business or Professional plan; Devnet is available on Developer and above. See Plans & Pricing for details.

1. Create a New Project

   mkdir laserstream-grpc-demo
   cd laserstream-grpc-demo
   npm init -y
   
2. Install Dependencies

   npm install helius-laserstream
   npm install --save-dev typescript tsx @types/node
   

   We use tsx because the default npx tsc --init on TypeScript 5.x sets verbatimModuleSyntax, module: "nodenext", and types: [], which all break a quick ts-node index.ts run. tsx runs .ts files without a tsconfig.

3. Obtain Your API Key

   Generate a key from the Helius Dashboard.

   This key will serve as your authentication token for LaserStream.

   Plan Requirements: LaserStream devnet is available on all plans. LaserStream mainnet requires a Business or Professional plan.

4. Create a Subscription Script

   Create index.ts with the following:

   import { subscribe, CommitmentLevel, LaserstreamConfig, SubscribeRequest } from 'helius-laserstream'
   
   async function main() {
     const subscriptionRequest: SubscribeRequest = {
       transactions: {
         "token-filter": { // user-defined label for this filter
           accountInclude: ['TokenkegQfeZyiNwAJbNbGKPFXCWuBvf9Ss623VQ5DA'],
           accountExclude: [],
           accountRequired: [],
           vote: false,
           failed: false
         }
       },
       commitment: CommitmentLevel.CONFIRMED,
       accounts: {},
       slots: {},
       transactionsStatus: {},
       blocks: {},
       blocksMeta: {},
       entry: {},
       accountsDataSlice: [],
       // Optionally, you can replay missed data by specifying a `fromSlot` (u64 number):
       // fromSlot: currentSlot - 1000,
       // Note: replay is currently limited to the last ~48 hours (~691,200 slots at current ~250ms slot time).
     };
   
   // Replace the values below with your actual LaserStream API key and endpoint
   const config: LaserstreamConfig = {
     apiKey: 'YOUR_API_KEY', // Replace with your key from https://dashboard.helius.dev/
     endpoint: 'https://laserstream-mainnet-ewr.helius-rpc.com', // Choose your closest region
   }
   
     await subscribe(config, subscriptionRequest, async (data) => {
       
       console.log(data);
   
     }, async (error) => {
       console.error(error);
     });
   }
   
   main().catch(console.error);
   
5. Replace Your API Key and Choose Your Region

   In index.ts, update the config object with:

   1. Your actual API key from the Helius Dashboard
   2. The LaserStream endpoint closest to your server location

   const config: LaserstreamConfig = {
     apiKey: 'YOUR_ACTUAL_API_KEY', // Replace with your key from Helius Dashboard
     endpoint: 'https://laserstream-mainnet-fra.helius-rpc.com', // Example: Frankfurt mainnet
     // For devnet: endpoint: 'https://laserstream-devnet-ewr.helius-rpc.com'
   }
   

   Network & Region Selection Examples:

   • For Production (Mainnet):
     • Europe: Use fra (Frankfurt), ams (Amsterdam), or lon (London)
     • US East: Use ewr (New York)
     • US West: Use slc (Salt Lake City) or lax (Los Angeles)
     • Asia: Use tyo (Tokyo) or sgp (Singapore)
   • For Development (Devnet):
     • Use https://laserstream-devnet-ewr.helius-rpc.com
6. Run and View Results

   npx tsx index.ts
   

   Whenever a confirmed token transaction involves TokenkegQfeZyiNwAJbNbGKPFXCWuBvf9Ss623VQ5DA, you’ll see the data in your console.

Common Workflows

Step-by-step guides for the workflows we see most often. Each guide uses the helius-laserstream SDK with auto-reconnect and historical replay built in.

Account Subscriptions

Monitor balance, data, and ownership changes on specific accounts with filters.

Transaction Monitoring

Stream transactions involving target accounts, filter by program, vote, or failure status.

Slot & Block Monitoring

Track network consensus, block production, and commitment-level transitions.

Decoding Transaction Data

Parse the binary transactionUpdate payloads into readable Solana transactions.

Stream Pump AMM Data

Real-world example: monitor Pump AMM trades with reconnect-safe filters.

The @triton-one/yellowstone-grpc client works against the same endpoints if you prefer the raw Yellowstone protocol. See the Yellowstone gRPC reference for protocol-level details.

Subscribe Request

In the subscribe request, you need to include the following general parameters:

Historical Replay: You can optionally include a fromSlot field (a u64 number) in the main SubscribeRequest object to replay data from a specific slot onwards. Replay is currently limited to the last ~48 hours (~691,200 slots at current network speed); note that replays older than ~20 minutes return finalized-only data.

commitment · enum

Specifies the commitment level, which can be processed, confirmed, or finalized.

accountsDataSlice · array

An array of objects { offset: uint64, length: uint64 } that allows you to receive only the required data slices from accounts.

ping · boolean

Some cloud providers (like Cloudflare) may close idle streams after a period of inactivity. To prevent this and keep the connection alive without needing to resend filters, set this to true. The server will respond with a Pong message every 15 seconds.

const subscriptionRequest: SubscribeRequest = {
  commitment: CommitmentLevel.CONFIRMED,
  accountsDataSlice: [],
  transactions: {},
  accounts: {},
  slots: {},
  blocks: {},
  blocksMeta: {},
  entry: {},
}

Next, you’ll need to specify the filters for the data you want to subscribe to, such as accounts, blocks, slots, or transactions.

Slots

Define filters for slot updates. The key you use (e.g., mySlotLabel) is a user-defined label for this specific filter configuration, allowing you to potentially define multiple named configurations if needed (though typically one is sufficient).

filterByCommitment · boolean

By default, slots are sent for all commitment levels. With this filter, you can choose to receive only the selected commitment level.

interslotUpdates · boolean

Enables the subscription to receive updates for changes within a slot, not just at the beginning of new slots. This is useful for more granular, low-latency slot data.

slots: {
  // mySlotLabel is a user-defined name for this slot update filter configuration
  mySlotLabel: {
    // filterByCommitment: true => Only broadcast slot updates at the specified subscribeRequest commitment
    filterByCommitment: true
    // interslotUpdates: true allows receiving updates for changes occurring within a slot, not just new slots.
    interslotUpdates: true
  }
},

Accounts

Define filters for account data updates. The key you use (e.g., tokenAccounts) is a user-defined label for this specific filter configuration.

account · array

Matches any public key from the provided array.

owner · array

The account owner’s public key. Matches any public key from the provided array.

filters · array

Similar to the filters in getProgramAccounts. This is an array of datasize and/or memcmp filters. For memcmp, the comparand goes on one of bytes, base58, or base64 directly on the memcmp object.

notifyOn · enum · deprecated

Deprecated — no-op as of Agave 4.2. Setting notifyOn has no effect. The field will be removed at a later date.

If all fields are empty, all accounts are broadcasted. Otherwise:

• Fields operate as a logical AND.
• Values within arrays act as a logical OR (except within filters, which operate as a logical AND).

accounts: {
  // tokenAccounts is a user-defined label for this account filter configuration
  tokenAccounts: {
    // Matches any of these public keys (logical OR)
    account: ["9SHQTA66Ekh7ZgMnKWsjxXk6DwXku8przs45E8bcEe38"],
    // Matches owners that are any of these public keys
    owner: ["TokenkegQfeZyiNwAJbNbGKPFXCWuBvf9Ss623VQ5DA"],
    // Filters - all must match (AND logic)
    filters: [
      { datasize: 165 },
      {
        memcmp: {
          offset: 0,
          base58: "EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v"
        }
      }
    ]
  }
},

Tracking more than ~10,000 accounts? Instead of an explicit pubkey list (32 bytes per account), use a compressed cuckoo filter (~3–4 bytes per account) to subscribe to hundreds of thousands of accounts in a single stream. Available in the Rust and JavaScript SDKs.

Transaction

Define filters for transaction updates. The key you use (e.g., myTxSubscription) is a user-defined label for this specific filter configuration.

vote · boolean

Enable or disable the broadcast of vote transactions.

failed · boolean

Enable or disable the broadcast of failed transactions.

signature · string

Broadcast only transactions matching the specified signature.

accountInclude · array

Filter transactions that involve any account from the provided list.

accountExclude · array

Exclude transactions that involve any account from the provided list (opposite of accountInclude).

accountRequired · array

Filter transactions that involve all accounts from the provided list (all accounts must be used).

tokenAccounts · string

Optional tokenAccounts (associated token account) expansion. When set, an accountInclude wallet also matches transactions where it owns an SPL token balance — e.g. incoming token transfers that touch the wallet’s token account rather than its pubkey. Accepts "balanceChanged" (balance-delta matches), "all" (any reference, higher volume), or "none" (no expansion, the default). The SDK converts the string to the wire-level TokenAccountExpansionControlFlag enum (part of yellowstone-grpc-proto 12.5.0+). See Token Account (ATA) Filtering for what it does and how it works.

matchMints · boolean

Optional matchMints flag (default false). When true, the accountInclude, accountExclude, and accountRequired lists are also matched against the mints in the transaction’s pre/post token balances, not just its account keys. Put a mint in accountInclude to receive every transaction that touches that token, including plain SPL transfers that never reference the mint in their account keys. Opt-in with no effect on existing filters. Requires helius-laserstream 0.8.5+ (JS), 0.6.4+ (Rust), or go/v0.3.0+ (Go). See Token Mint Filtering for semantics and examples.

If all fields are left empty, all transactions are broadcasted. Otherwise:

• Fields operate as a logical AND.
• Values within arrays are treated as a logical OR (except for accountRequired, where all must match).

transactions: {
  // myTxSubscription is a user-defined label for this transaction filter configuration
  myTxSubscription: {
    vote: false,
    failed: false,
    signature: "",
    // Transaction must include at least one of these public keys (OR)
    accountInclude: ["86xCnPeV69n6t3DnyGvkKobf9FdN2H9oiVDdaMpo2MMY"],
    // Exclude if it matches any of these
    accountExclude: [],
    // Require all accounts in this array (AND)
    accountRequired: []
  }
},

Block

Define filters for block updates. The key you use (e.g., myBlockLabel) is a user-defined label for this specific filter configuration.

accountInclude · array

Filters transactions and accounts that involve any account from the provided list.

includeTransactions · boolean

Includes all transactions in the broadcast.

includeAccounts · boolean

Includes all account updates in the broadcast.

includeEntries · boolean

Includes all entries in the broadcast.

blocks: {
  // myBlockLabel is a user-defined label for this block filter configuration
  myBlockLabel: {
    // Only broadcast blocks referencing these accounts
    accountInclude: ["86xCnPeV69n6t3DnyGvkKobf9FdN2H9oiVDdaMpo2MMY"],
    includeTransactions: true,
    includeAccounts: false,
    includeEntries: false
  }
},

Blocks Meta

This functions similarly to Blocks but excludes transactions, accounts, and entries. The key you use (e.g., blockmetadata) is a user-defined label for this subscription. Currently, no filters are available for block metadata—all messages are broadcasted by default.

blocksMeta: {
  blockmetadata: {}
},

Entries

Subscribe to ledger entries. The key you use (e.g., entrySubscribe) is a user-defined label for this subscription. Currently, there are no filters available for entries; all entries are broadcasted.

entry: {
  entrySubscribe: {}
},

Code Examples (LaserStream SDK)

Slot Updates

import { subscribe, CommitmentLevel, LaserstreamConfig, SubscribeRequest } from 'helius-laserstream'

async function main() {
    const subscriptionRequest: SubscribeRequest = {
        transactions: {},
        commitment: CommitmentLevel.CONFIRMED,
        accounts: {},
        slots: {
            slot: { filterByCommitment: true },
        },
        transactionsStatus: {},
        blocks: {},
        blocksMeta: {},
        entry: {},
        accountsDataSlice: [],
    };

    const config: LaserstreamConfig = {
        apiKey: 'YOUR_API_KEY', // Replace with your key
        endpoint: 'https://laserstream-mainnet-ewr.helius-rpc.com', // Choose your closest region
    }

    await subscribe(config, subscriptionRequest, async (data) => {
        console.log(data);
    }, async (error) => {
        console.error(error);
    });
}

main().catch(console.error);

Account Updates

import { subscribe, CommitmentLevel, LaserstreamConfig, SubscribeRequest } from 'helius-laserstream'

async function main() {
    const subscriptionRequest: SubscribeRequest = {
        accounts: {
            "usdc-account": { // user-defined label for this filter
                account: ["EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v"], // USDC mint account
                owner: [],
                filters: []
            }
        },
        accountsDataSlice: [],
        commitment: CommitmentLevel.CONFIRMED,
        slots: {},
        transactions: {},
        transactionsStatus: {},
        blocks: {},
        blocksMeta: {},
        entry: {}
    };

    const config: LaserstreamConfig = {
        apiKey: 'YOUR_API_KEY', // Replace with your key
        endpoint: 'https://laserstream-mainnet-ewr.helius-rpc.com', // Choose your closest region
    }

    await subscribe(config, subscriptionRequest, async (data) => {
        console.log(data);
    }, async (error) => {
        console.error(error);
    });
}

main().catch(console.error);

Transaction Updates

import { subscribe, CommitmentLevel, LaserstreamConfig, SubscribeRequest } from 'helius-laserstream'

async function main() {
    const subscriptionRequest: SubscribeRequest = {
        transactions: {
            "token-filter": { // user-defined label for this filter
                accountInclude: ['TokenkegQfeZyiNwAJbNbGKPFXCWuBvf9Ss623VQ5DA'],
                accountExclude: [],
                accountRequired: [],
                vote: false,
                failed: false
            }
        },
        commitment: CommitmentLevel.CONFIRMED,
        accounts: {},
        slots: {},
        transactionsStatus: {},
        blocks: {},
        blocksMeta: {},
        entry: {},
        accountsDataSlice: [],
    };

    const config: LaserstreamConfig = {
        apiKey: 'YOUR_API_KEY', // Replace with your key
        endpoint: 'https://laserstream-mainnet-ewr.helius-rpc.com', // Choose your closest region
    }

    await subscribe(config, subscriptionRequest, async (data) => {
        console.log(data);
    }, async (error) => {
        console.error(error);
    });
}

main().catch(console.error);

Blocks

import { subscribe, CommitmentLevel, LaserstreamConfig, SubscribeRequest } from 'helius-laserstream'

async function main() {
    const subscriptionRequest: SubscribeRequest = {
        entry: {},
        accounts: {},
        accountsDataSlice: [],
        slots: {},
        blocks: {
            blocks: {
                accountInclude: []
            }
        },
        blocksMeta: {},
        transactions: {},
        transactionsStatus: {},
        commitment: CommitmentLevel.CONFIRMED,
    };

    const config: LaserstreamConfig = {
        apiKey: 'YOUR_API_KEY', // Replace with your key
        endpoint: 'https://laserstream-mainnet-ewr.helius-rpc.com', // Choose your closest region
    }

    await subscribe(config, subscriptionRequest, async (data) => {
        console.log(data);
    }, async (error) => {
        console.error(error);
    });
}

main().catch(console.error);

Block Metadata

import { subscribe, CommitmentLevel, LaserstreamConfig, SubscribeRequest } from 'helius-laserstream'

async function main() {
    const subscriptionRequest: SubscribeRequest = {
        entry: {},
        accounts: {},
        accountsDataSlice: [],
        slots: {},
        blocks: {},
        blocksMeta: {
            blockmetadata: {}
        },
        transactions: {},
        transactionsStatus: {},
        commitment: CommitmentLevel.CONFIRMED,
    };

    const config: LaserstreamConfig = {
        apiKey: 'YOUR_API_KEY', // Replace with your key
        endpoint: 'https://laserstream-mainnet-ewr.helius-rpc.com', // Choose your closest region
    }

    await subscribe(config, subscriptionRequest, async (data) => {
        console.log(data);
    }, async (error) => {
        console.error(error);
    });
}

main().catch(console.error);

Entries

import { subscribe, CommitmentLevel, LaserstreamConfig, SubscribeRequest } from 'helius-laserstream'

async function main() {
    const subscriptionRequest: SubscribeRequest = {
        entry: {
            entrySubscribe: {}  // Subscribe to all entries
        },
        accounts: {},
        accountsDataSlice: [],
        slots: {},
        blocks: {},
        blocksMeta: {},
        transactions: {},
        transactionsStatus: {},
        commitment: CommitmentLevel.CONFIRMED,
    };

    const config: LaserstreamConfig = {
        apiKey: 'YOUR_API_KEY', // Replace with your key
        endpoint: 'https://laserstream-mainnet-ewr.helius-rpc.com', // Choose your closest region
    }

    await subscribe(config, subscriptionRequest, async (data) => {
        console.log(data);
    }, async (error) => {
        console.error(error);
    });
}

main().catch(console.error);

Unary Methods

import { LaserstreamClient, CommitmentLevel } from 'helius-laserstream'

async function main() {
    // Create once and reuse: all calls share one connection
    const client = new LaserstreamClient({
        apiKey: 'YOUR_API_KEY', // Replace with your key
        endpoint: 'https://laserstream-mainnet-ewr.helius-rpc.com', // Choose your closest region
    });

    // Commitment is optional (server default when omitted)
    const { slot } = await client.getSlot(CommitmentLevel.CONFIRMED);
    const { blockHeight } = await client.getBlockHeight();
    const bh = await client.getLatestBlockhash(); // { blockhash, slot, lastValidBlockHeight }
    const { valid } = await client.isBlockhashValid(bh.blockhash);
    const { version } = await client.getVersion();
    const { count } = await client.ping(1);
    const { firstAvailable } = await client.subscribeReplayInfo(); // earliest replayable slot

    // uint64 values (slots, heights) are returned as strings
    console.log({ slot, blockHeight, blockhash: bh.blockhash, valid, version, count, firstAvailable });

    client.close();
}

main().catch(console.error);

SDK Options

We provide official SDKs for multiple programming languages:

• TypeScript: LaserStream TypeScript SDK
• Rust: LaserStream Rust SDK
• Go: LaserStream Go SDK

For other languages or custom implementations, you can use the Yellowstone gRPC proto files directly to generate gRPC clients for your preferred language.

Troubleshooting / FAQ

Q: I'm experiencing lag or slow performance with my LaserStream connection. What could be causing this?

A: Performance issues with LaserStream connections are typically caused by:

• Javascript Client Slowness: The JavaScript client may lag behind when processing too many messages or consuming too much bandwidth. Consider filtering your subscriptions more narrowly to reduce message volume, switch to the LaserStream JavaScript SDK, or try using another language.

• Limited local bandwidth: Heavy subscriptions can overwhelm clients with limited network bandwidth. Monitor your network usage and consider upgrading your connection or reducing subscription scope.

• Geographic distance: Long network routes increase latency and packet loss. Use the endpoint closest to your server. For high-latency connections, increase your network read buffer sizes (can improve bandwidth by 5x+):

  sudo sysctl -w net.core.rmem_max=67108864 net.ipv4.tcp_rmem="4096 87380 67108864"
  

  To persist across reboots, add to /etc/sysctl.conf:

  net.core.rmem_max=67108864
  net.ipv4.tcp_rmem=4096 87380 67108864
  

  Increase the HTTP/2 stream and connection window sizes to 64MB to prevent flow control bottlenecks. Both are required — raising only the stream window leaves the connection-level window as the binding constraint:

  // Rust (tonic)
  Channel::from_static("https://laserstream-mainnet-ewr.helius-rpc.com")
      .initial_stream_window_size(1024 * 1024 * 64)      // 64MB stream window
      .initial_connection_window_size(1024 * 1024 * 64)  // 64MB connection window
      .connect()
      .await?;
  

• Client-side processing bottlenecks: Ensure your message processing logic is optimized and doesn’t block the main thread for extended periods.

Debugging Client Lag: To help you debug client, we built a tool to test for the max bandwidth from your node to a Laserstream gRPC server. To use it run:

cargo install helius-laserstream-bandwidth
helius-laserstream-bandwidth --laserstream-url $LASERSTREAM_URL --api-key $API_KEY

The output returns the max network capacity between your server and the Laserstream server. At a minimum, you need 10MB/s to subscribe to all transaction data and 80MB/s to subscribe to all account data. We recommend having at least 2x the required capacity for optimal performance.

Q: I'm getting connection errors. What should I check?

A: Verify your API key and endpoint are correct and that your network allows outbound gRPC connections to the specified endpoint. Check the Helius status page for any ongoing incidents.

Q: Why aren't my filters working as expected?

A: Double-check the logical operators (AND/OR) described in the filter sections. Ensure public keys are correct. Review the commitment level specified in your request.

Q: Can I subscribe to multiple types of data (e.g., accounts and transactions) in one request?

A: Yes, you can define filter configurations under multiple keys (e.g., accounts, transactions) within the same SubscribeRequest object.

Q: Does LaserStream support consumer groups?

A: We don’t implement consumer groups. Instead, LaserStream delivers the same outcomes teams want: resume, replay, and multi-node reliability without a coordination layer (and the latency/overhead that comes with it). We believe consumer groups are not needed for most workloads and they add latency and operational overhead. As an example a single LaserStream gRPC connection can emit up to 10× Solana’s transaction + account data, and most clients subscribe to a small, filtered slice. Using consumer groups in this case burns performance headroom and introduces another point of failure.

Q: Why are my transaction log messages cut off?

A: LaserStream truncates transaction log messages to 10 KB by default for better speed and performance. If you need full logs, connect to a dedicated untruncated endpoint — see Log Truncation for the list.

Q: Why am I only receiving Pong responses with no account or slot data?

A: Including a ping field in your initial SubscribeRequest causes LaserStream to silently ignore all subscription filters — only a Pong is returned with zero account, transaction, or slot data. To fix this, remove ping from the initial subscribe request and instead send pings separately via the stream’s sink after the subscription is established. This keeps the connection alive without interfering with your filters.