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This guide covers the technical details for using the High-Load Wallet (HLW) type within Fireblocks for the TON (The Open Network) blockchain. Traditionally, Fireblocks supported a single wallet type per blockchain. For TON, this was the TON_V4 wallet, which is limited by sequential transaction execution and strict nonce management. The High-Load Wallet is a new, extensible wallet implementation designed to:
  • Increase throughput: Enable parallel transaction execution.
  • Remove bottlenecks: Bypass the “one-transaction-at-a-time” constraint of standard wallets.
  • Support high-frequency use cases: Scale for exchanges, payment processors, and similar workloads.

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Creating a High-Load Wallet

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Immutable implementation selection

The choice of wallet type is made at the moment of creation. To create a TON High-Load Wallet, pass the blockchainWalletType parameter during the asset creation flow:
ValueDescription
TON_V4Standard single-threaded wallet (default).
highload_v3Optimized for parallel processing.

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API integration example

The following snippet demonstrates how to use the Fireblocks SDK to add a TON asset with the High-Load Wallet configuration to a vault account.
TypeScript
import { VaultsApiFp } from "@fireblocks/ts-sdk";

// ... initial client setup ...

const vaultAccountId = "12"; // Your Vault ID
const assetId = "TON";       // Asset ID
const blockchainWalletType = "highload_v3";

// Generate the request function
const requestFn = await VaultsApiFp(fireblocks.vaults.configuration).createVaultAccountAsset(
    vaultAccountId,
    assetId,
    undefined,
    undefined,
    { params: { blockchainWalletType } } // Pass the wallet type in query params
);

// Execute the request
const { data: asset } = await requestFn(fireblocks.vaults.axios, fireblocks.vaults.basePath);

console.log(`Asset Created: ${asset.id} with Address: ${asset.address}`);

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Transaction flow and monitoring

Once the wallet is created, initiating an HLW TON transaction is the same as a regular TON transaction and can be done from the Fireblocks API or Console.

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Limitations

  1. Single TON address per vault: You can create only one TON wallet (either TON_V4 or HLW) in a vault account.
  2. No batching: Fireblocks does not currently support batched TON transactions. Each transaction supports a single transfer only.
  3. Parallel transaction sending: To enable sending multiple transactions in parallel, contact Fireblocks Support and provide the vault ID of your HLW.