Build on
HeLa Chain.

Networks

HeLa runs two networks. Build and test on testnet first — then deploy to mainnet when ready.

Connect Your Wallet

HeLa is EVM-compatible. Add it to MetaMask, Hardhat, Foundry, or any standard Ethereum tooling using the network params above.

MetaMask — Manual Add

Hardhat Config

// hardhat.config.js
module.exports = {
  networks: {
    hela_testnet: {
      url: "https://testnet-rpc.helachain.com",
      chainId: 666888,
      accounts: [process.env.PRIVATE_KEY]
    },
    hela_mainnet: {
      url: "https://mainnet-rpc.helachain.com",
      chainId: 8668,
      accounts: [process.env.PRIVATE_KEY]
    }
  }
};

Foundry (foundry.toml)

[rpc_endpoints]
hela_testnet = "https://testnet-rpc.helachain.com"
hela_mainnet = "https://mainnet-rpc.helachain.com"

Testnet Faucet

Citizen ID Integration

HeLa Citizen ID is a biometric on-chain identity — users authenticate with face or fingerprint instead of seed phrases. More on Citizen ID →

Verify a Citizen ID on-chain

// Check if an address holds a Citizen ID
const provider = new ethers.providers.JsonRpcProvider(
  "https://mainnet-rpc.helachain.com"
);
const citizenId = new ethers.Contract(
  CITIZEN_ID_CONTRACT,
  ["function balanceOf(address) view returns (uint256)"],
  provider
);
const hasCitizenId = (await citizenId.balanceOf(userAddress)).gt(0);

ERC-6551 Token-Bound Accounts

Every HeLa Citizen ID NFT can have its own smart contract wallet via ERC-6551. The NFT owns the wallet — transfer the NFT, transfer the wallet and its assets.

Deploy a Token-Bound Account

// Deploy a TBA for a Citizen ID NFT
const registry = new ethers.Contract(
  ERC6551_REGISTRY_ADDRESS,
  ERC6551_REGISTRY_ABI,
  signer
);

const tbaAddress = await registry.createAccount(
  IMPLEMENTATION_ADDRESS,  // TBA implementation
  8668,                    // chainId
  CITIZEN_ID_CONTRACT,     // NFT contract
  tokenId,                 // NFT token ID
  0,                       // salt
  "0x"                     // initData
);
console.log("TBA deployed at:", tbaAddress);

Gasless Transactions

HeLa supports meta-transactions — users sign a payload, a relayer pays the gas. Ideal for onboarding new users with zero HELA balance.

Flow

HelaSyn SDK

HelaSyn lets you deploy AI agents that live on HeLa Chain, hold their own Citizen IDs, and earn HLUSD from real tasks. Full SDK docs →

Install

npm install @hela/syn

Deploy an Agent

import { HelaSyn } from '@hela/syn';

const agent = await HelaSyn.deploy({
  name:        "my-agent",
  persona:     "You are a helpful assistant for HeLa users.",
  model:       "claude-sonnet",
  channels:    ["telegram", "whatsapp"],
  network:     "mainnet",   // or "testnet"
});

console.log("Agent live at:", agent.citizenId);

RPC Quick Reference

Dev Tools