How to enable Sybil resistance in your dApps on Hyperliquid?

Humanode Core -

If trading on Hyperliquid feels like hitting light speed, you’re not alone. With fast finality, deep liquidity, and ultra-low fees, it’s like stepping into the future of decentralized finance (DeFi). But with great speed comes… well, Sybils.

DeFi is mostly preferred for composability and permissionless access, but this creates vulnerabilities. Without Sybil resistance, bad actors can spin up multiple wallets to game liquidity incentives, exploit arbitrage, and manipulate token pools. Biomapper ensures that every wallet interacting with your dApp on HyperEVM belongs to a unique human – no KYC, no identity exposure, just cryptographic proof of uniqueness.

If you are building on HyperEVM, you might want to consider a decentralized Sybil resistance on-chain tool. Since Biomapper is already deployed on HyperEVM, you can easily integrate it into your dApp to ensure only verified, unique users interact with your contract. This article will walk you through how to integrate Biomapper using the Biomapper SDK.

How to enable Sybil resistance in your dApps on HyperEVM

Before integrating Biomapper, familiarize yourself with core concepts such as:

  • Generations: Biomapper operates in fixed time-based generations. Each generation resets biometric mappings.
  • Integration Flow: Users verify uniqueness once, bridge their biomapping to the Hyperliquid, and can be verified across multiple dApps.

What You Need to Do

  • Write a smart contract that interacts with the Bridged Biomapper on HyperEVM.
  • Add a link to the Biomapper UI on your front end so users can complete their biomapping.

Integration Steps

1. Install the Biomapper SDK

The Biomapper SDK allows smart contracts on HyperEVM to verify user uniqueness through the Bridged Biomapper.

Using npm:

npm install --save @biomapper-sdk/core @biomapper-sdk/libraries @biomapper-sdk/events

Using yarn:

yarn add @biomapper-sdk/core @biomapper-sdk/libraries @biomapper-sdk/events

Using Foundry:

forge install humanode-network/biomapper-sdk

2. Import Biomapper Interfaces & Libraries

In your Solidity contract, import the necessary interfaces:

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.20;
import { IBridgedBiomapperRead } from "@biomapper-sdk/core/IBridgedBiomapperRead.sol";
import { IBiomapperLogRead } from "@biomapper-sdk/core/IBiomapperLogRead.sol";
import { BiomapperLogLib } from "@biomapper-sdk/libraries/BiomapperLogLib.sol";

These imports expose read-access functions to check a wallet’s biomapping status and uniqueness.

3. Connect to Bridged Biomapper

HyperEVM already has Bridged Biomapper deployed, so you don’t need to deploy your own – just reference the existing contract.

Example: Uniqueness check for DEX Liquidity Mining

pragma solidity ^0.8.0;
import "@biomapper-sdk/core/IBridgedBiomapperRead.sol";
import "@openzeppelin/contracts/token/ERC20/IERC20.sol";
import "@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol";
contract DexLiquidityMining {
    using SafeERC20 for IERC20;
    IBridgedBiomapperRead public biomapper;
    IERC20 public immutable REWARD_TOKEN;
    mapping(address => uint256) public liquidityProvided;
    constructor(address _biomapperAddress, address _rewardToken) {
        biomapper = IBridgedBiomapperRead(_biomapperAddress);
        REWARD_TOKEN = IERC20(_rewardToken);
    }
    function claimLiquidityReward() external {
        require(biomapper.isBridgedUnique(msg.sender), "User is not unique");
        require(liquidityProvided[msg.sender] > 0, "No liquidity provided");
        uint256 rewardAmount = calculateReward(msg.sender);
        liquidityProvided[msg.sender] = 0;
        REWARD_TOKEN.safeTransfer(msg.sender, rewardAmount);
    }
    function provideLiquidity(address provider, uint256 amount) external {
        liquidityProvided[provider] += amount;
    }
    function calculateReward(address provider) internal view returns (uint256) {
        return liquidityProvided[provider] / 50; // Example reward calculation
    }
}

This contract checks if liquidity providers are unique when they claim mining rewards, eliminating Sybil-based multi-wallet exploitation.

4. Local Testing with Mock Contracts

For local testing, use the MockBridgedBiomapper contract to simulate biomapping without hitting mainnet.

Example:

function generationsBridgingTxPointsListItem(uint256 ptr) external view returns (GenerationBridgingTxPoint memory);

Refer to Biomapper SDK Docs for full details on using mocks.

Frontend Integration

To complete user verification, link to the Biomapper App in your dApp UI.

Example Frontend Integration:

< a href="https://biomapper.hmnd.app" target="_blank">Verify Your Uniqueness < /a>

Once users complete their biometric verification, they return to your dApp and interact Sybil-free.

Deployment & Rollout

1. Deploy the Smart Contract

Deploy your trading, liquidity mining, or staking contract to HyperEVM and link it to Bridged Biomapper.

2. Retrieve the Bridged Biomapper Contract Address

Find the latest contract addresses from the Biomapper SDK.

3. Update Frontend to Mainnet

Ensure your UI links to the mainnet Biomapper App.

4. Test Before Deployment

  • Use HyperEVM testnet for pre-launch validation.
  • Confirm that biomapping checks prevent multi-wallet exploitation.
  • Log interactions to monitor anomalies in biomapping verification.

Post-Deployment & Maintenance

  • dApp Listing → Get featured in Humanode’s Biomapper ecosystem.
  • Ongoing Updates → Stay aligned with Biomapper SDK improvements.

Final Thoughts

HyperEVM provides unmatched performance for financial dApps whether you're building a DEX, perpetual trading platform, or staking protocol. But with high liquidity and speed, Sybil resistance becomes essential to protect market integrity.

Biomapper makes it easy no KYC, just cryptographic proof of uniqueness. Whether you’re building for traders or liquidity providers, Sybil resistance ensures a fair and secure ecosystem.

Here are resources to start or test your integration

Resources