Smart Contracts

Relaycode integrates a full Solidity development workflow directly into the extrinsic builder, enabling you to write, compile, and deploy smart contracts on Polkadot Hub without leaving the app.

What is pallet-revive?

Polkadot Hub runs pallet-revive, supporting two virtual machines:

• EVM (REVM) — Full EVM compatibility. Standard Solidity bytecode compiled with solc.
• PVM (PolkaVM) — Polkadot-native RISC-V VM. Solidity compiled to PolkaVM bytecode via resolc.

Both VMs use the same extrinsic: Revive.instantiateWithCode(value, weightLimit, storageDepositLimit, code, data, salt).

Supported Chains

How Relaycode Helps

When you select Revive > instantiate_with_code in the extrinsic builder, Relaycode replaces the generic hex inputs with:

1. Solidity Editor — Monaco-powered code editor with syntax highlighting for the code parameter
2. Dual Compilation — Compile to EVM or PVM bytecode with one click
3. Import Resolution — OpenZeppelin and other npm packages resolved automatically from CDN
4. Constructor Args Form — Typed inputs generated from the contract ABI for the data parameter
5. Upload Mode — Upload pre-compiled bytecode and ABI from external tools (Remix, Hardhat, Foundry)

All of this feeds into the standard extrinsic submission flow — connect your Polkadot wallet (Talisman, SubWallet, or Polkadot.js) and sign the transaction.

EVM vs PVM

Relaycode is unique in supporting both targets through native Substrate extrinsics with Polkadot wallets — no MetaMask required.