Fireblocks Institutional Custody Integration

What Fireblocks Provides

MPC-CMP Protocol:

The key is split between three parties — your infrastructure, Fireblocks' servers, and a mobile co-signer app. No complete key exists anywhere. Signing requires 2 of 3 parties to participate in a cryptographic ceremony.

Policy Engine:

Define rules for automated vs. human-approved withdrawals. Example: 'Transfers under $10,000 to whitelisted addresses: auto-approve. Transfers over $100,000: require 2-of-3 human approvers.'

Multi-chain support:

Bitcoin, Ethereum, Polygon, Solana, Arbitrum, and 40+ other chains from a single integration.

Fireblocks API Integration

const FireblocksSDK = require('@fireblocks/fireblocks-sdk');

const fireblocks = new FireblocksSDK.FireblocksSDK(
    process.env.FIREBLOCKS_API_SECRET,
    process.env.FIREBLOCKS_API_KEY,
    'https://api.fireblocks.io'
);

// Create a new vault account for a user
async function createUserVault(userId) {
    const vault = await fireblocks.createVaultAccount(`user_${userId}`, false);
  
    // Create wallet for each supported asset
    await fireblocks.createVaultAsset(vault.id, 'ETH');
    await fireblocks.createVaultAsset(vault.id, 'USDC_POLYGON');
    await fireblocks.createVaultAsset(vault.id, 'BTC');
  
    return vault;
}

Cost Considerations

Fireblocks pricing is not public but typically: $2,000–$15,000/month depending on transaction volume, number of vaults, and features. Compared to building your own MPC infrastructure ($200,000+ development cost + ongoing key management overhead): Fireblocks is cost-effective for exchanges processing under $100M/day.