Your stack works — Solidity, Hardhat, Foundry, MetaMask — with a chain ID change and one compiler flag. What changes is the ground under your contract: monetary rules and consensus that cannot be governance-voted out from under it.
The one thing that will bite you: Solidity 0.8.20+ targets Shanghai by default and emits PUSH0, which Paris does not have. Pin the EVM version and everything else is ordinary.
import { HardhatUserConfig } from "hardhat/config";
const config: HardhatUserConfig = {
solidity: {
version: "0.8.24",
settings: { evmVersion: "paris" },
},
networks: {
parallax: {
url: "https://rpc.parallaxprotocol.org",
chainId: 2110,
},
},
};
export default config;[profile.default] evm_version = "paris" [rpc_endpoints] parallax = "https://rpc.parallaxprotocol.org"
Five differences that change how you design, none that change how you write Solidity.
Every instrument historically built atop scarce money — credit, exchange, custody, derivatives — settles somewhere. On Parallax it settles against a base asset with a fixed supply, secured by physical work, on a chain with no foundation, no token vote, and no mechanism by which a transaction can be privileged or refused. Your contract inherits that neutrality: no one can be stopped from deploying, and nothing deployed can be stopped.