Building on Elysium: A Developer Guide to the Gotchas

Elysium runs stock ArbOS, so Solidity and Vyper compile unchanged and Foundry, Hardhat, viem and ethers work as on any Arbitrum Orbit chain. Six things differ from what you might assume: transfers need about 21,140 gas, there's no public mempool, block.number returns HyperEVM's height, viem has no built-in Kinetiq Elysium chain, HyperEVM's HyperCore precompiles aren't there at launch, and finality follows batch posts to HyperEVM.

The gotchas

Define Elysium in viem

import { defineChain } from "viem";

export const elysium = defineChain({
  id: 99901,
  name: "Elysium",
  nativeCurrency: { name: "HYPE", symbol: "HYPE", decimals: 18 },
  rpcUrls: {
    // Use the official RPC from Kinetiq's docs, or your provider's
    // (e.g. https://elysium-mainnet.g.alchemy.com/v2/{API_KEY}).
    default: { http: ["<your Elysium RPC URL>"] },
  },
  contracts: {
    multicall3: { address: "0xcA11bde05977b3631167028862bE2a173976CA11" },
  },
});

For the testnet, use id 99801 and https://testnet-rpc.elysium.kinetiq.xyz.

Fees and ordering

• Gas is paid in native HYPE; the estimate includes an L1 (HyperEVM) component reported as gasUsedForL1.
• The minimum gas price read on mainnet was 0.1 gwei (5 November 2026).
• Transactions are ordered by priority fee, with no privileged lanes; Timeboost is planned.

Verifying contracts

Kinetiq's explorer is Blockscout-based; Chainstack documents the verification API at https://elysium.kinetiq.xyz/api (no key). Mainnet explorer details are published at launch.

Tokens and liquidity

• Avoid fee-on-transfer and rebasing designs if your token needs the official bridge.
• To reach HyperCore spot later, mirror the token to HyperEVM and run HyperCore's spot deployment.
• Lock your launch liquidity and team allocations so holders can verify them — Titan Locker supports Uniswap V2 LP, V3/V4 positions, tokens and vesting on Elysium.