Getting Started

Deploy a Solidity smart contract to Polkadot Hub in under 5 minutes.

Prerequisites

• A Polkadot wallet extension (Talisman, SubWallet, or Polkadot.js)
• Testnet tokens from the Polkadot Faucet

Step 1: Connect and Switch Chain

1. Open Relaycode and connect your wallet
2. Switch to Westend Asset Hub (testnet) using the chain selector
3. Ensure you have testnet WND tokens for gas fees

Step 2: Select the Revive Pallet

1. In the extrinsic builder, select Revive as the section
2. Select instantiate_with_code as the method
3. The code and data fields will show the smart contract editor

Step 3: Write Your Contract

The editor comes with a default template. You can modify it or write your own:

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.20;

contract Flipper {
    bool public value;

    constructor(bool _value) {
        value = _value;
    }

    function flip() public {
        value = !value;
    }
}

Step 4: Compile

1. Select your compilation target: EVM or PVM
2. Click Compile
3. The compiler resolves imports automatically and produces bytecode
4. If compilation succeeds, the bytecode is automatically filled into the code parameter

Step 5: Set Constructor Arguments

The data field renders typed inputs based on your contract's constructor:

• For the Flipper example: a boolean toggle for _value
• Arguments are automatically ABI-encoded

Step 6: Configure and Submit

1. Set value to 0 (unless your constructor is payable)
2. Set weight_limit — use { ref_time: 500000000000, proof_size: 500000 } as a starting point
3. Set storage_deposit_limit — 10000000000 (10 WND) is usually sufficient for small contracts
4. Leave salt as None for default address derivation, or provide a 32-byte salt for deterministic addresses
5. Click Sign and Submit

Step 7: Verify

After the transaction is included in a block, your contract is deployed. You can verify it on the Westend Asset Hub explorer.

Using Upload Mode

If you compiled your contract externally (Remix, Hardhat, Foundry):

1. Switch the code field to Upload mode
2. Upload your bytecode file (.bin or .hex)
3. Optionally upload the ABI (.json) to enable the constructor args form
4. The data field will show typed inputs if an ABI is provided