Pre-Deployment Scripts

This repository provides tooling for deploying canonical helper contracts using pre-signed transactions. The script automatically funds deployment addresses from your account and broadcasts the pre-signed transactions.

Overview

The deployment script uses the deterministic deployment proxy approach where:

Pre-signed transactions are already prepared with specific signatures
The script estimates actual gas cost on the target L2 and funds deployer addresses with only what is needed (plus a configurable safety buffer)
The script broadcasts the transactions using cast publish
Contracts are deployed to their canonical, deterministic addresses

The repository includes a reproducible toolchain for pre-deploying canonical helper contracts. The workflow compiles the upstream sources deterministically, loads bytecode from a checked-in artifact, and provides a CLI for broadcasting deployments on L2 using pre-signed transactions.

Supported Contracts

Contract	Expected Address	Funding Address	Required Amount
Create2 Proxy (Arachnid)	`0x4e59b44847b379578588920cA78FbF26c0B4956C`	`0x3fAB184622Dc19b6109349B94811493BF2a45362`	0.01 ETH
ERC2470 Singleton Factory	`0xce0042B868300000d44A59004Da54A005ffdcf9f`	`0xBb6e024b9cFFACB947A71991E386681B1Cd1477D`	0.03 ETH
Multicall3	`0xcA11bde05977b3631167028862bE2a173976CA11`	`0x05f32b3cc3888453ff71b01135b34ff8e41263f2`	0.1 ETH
Create2 Proxy (Zoltu)	`0x7A0D94F55792C434d74a40883C6ed8545E406D12`	`0x4c8D290a1B368ac4728d83a9e8321fC3af2b39b1`	0.03 ETH
CreateX	`0xba5Ed099633D3B313e4D5F7bdc1305d3c28ba5Ed`	`0xeD456e05CaAb11d66C4c797dD6c1D6f9A7F352b5`	0.3 ETH
Universal Deployer	`0x1b926fbb24a9f78dcdd3272f2d86f5d0660e59c0`	`0x9c5a87452d4FAC0cbd53BDCA580b20A45526B3AB`	0.0217 ETH

Prerequisites

Node.js >= 18.9.0
Foundry (for cast command)
An L2 RPC URL (for the target network)
A funded account with private key (for funding deployment addresses)

Setup

Install dependencies:
```
npm install
```
Create a .env file with your configuration:
```
cat > .env << EOF
L2_RPC_URL=https://your-l2-rpc-url
FUNDER_PRIVATE_KEY=0xYourPrivateKeyHere
EOF
```
The FUNDER_PRIVATE_KEY account will be used to automatically fund deployment addresses with the required amounts.

Usage

Gas Estimate (Pre-flight Check)

Before sending any funds, run a gas estimate to see exactly how much ETH each deployer address needs on your target L2. No funder key required — this is read-only:

npm run deploy -- --gas-estimate --l2-rpc <url>

This will:

Simulate each deployment via eth_estimateGas to get actual expected gas usage
Check each deployer address nonce (warns if non-zero, meaning the pre-signed tx is unusable)
Show estimated cost vs hardcoded amount and expected leftover per contract
Works even if contracts are already deployed on the network

Example output:

[L2] Running gas estimation...

  CreateX (createx)
    ✓ Already deployed at 0xba5Ed099633D3B313e4D5F7bdc1305d3c28ba5Ed
    Gas price (tx):  100.0 gwei
    Gas limit (tx):  3,000,000
    Estimated gas:   2,602,553 used
    Estimated cost:  0.260255 ETH
    Expected refund: 0.039745 ETH left in deployer after tx

Dry Run (Check Status)

Check which contracts need funding and which are already deployed, with no RPC calls:

npm run deploy -- --dry-run

Deploy All Contracts

Deploy all supported contracts (the script will estimate gas, fund deployers with only what's needed, and skip already deployed contracts):

npm run deploy -- --confirm

Deploy Specific Contracts

Deploy only certain contracts by specifying their keys:

npm run deploy -- --contracts create2_proxy_arachnid,multicall3 --confirm

Available contract keys:

create2_proxy_arachnid
erc2470_singleton_factory
multicall3
create2_proxy_zoltu
createx
universal_deployer

Adjusting the Gas Buffer

By default the script adds a 20% buffer on top of the gas estimate when funding deployers. You can tune this with --gas-buffer:

# More conservative — 30% buffer
npm run deploy -- --gas-buffer 30 --confirm

# Tighter — 10% buffer
npm run deploy -- --gas-buffer 10 --confirm

Interactive Mode

If you omit --confirm, the script will ask for confirmation before proceeding:

npm run deploy

CLI Options

Options:
  --l2-rpc <url>              L2 RPC URL (or set L2_RPC_URL env var)
  --funder-private-key <hex>  Private key to fund deployment addresses (or set FUNDER_PRIVATE_KEY env var)
  --target <target>           Deployment target: l2 (default: "l2")
  --contracts <list>          Comma-separated contract keys (defaults to all)
  --dry-run                   Print actions without broadcasting transactions
  --confirm                   Skip interactive confirmation prompt
  --gas-estimate              Estimate actual gas costs on L2 and compare with hardcoded amounts (requires --l2-rpc)
  --gas-buffer <percent>      Extra % added on top of gas estimate when funding deployer addresses (default: 20)
  -h, --help                  Display help

How It Works

Check if already deployed: The script checks if each contract already exists at its expected address
Estimate gas: For contracts that need deployment, the script calls eth_estimateGas on the pre-signed transaction to determine how much ETH the deployer address actually needs on this specific L2
Calculate funding amount: fundingAmount = estimatedGas × txGasPrice × (1 + gasBuffer%). If estimation fails, falls back to the hardcoded maximum (gasLimit × gasPrice)
Top up deployer if needed: If the deployer address balance is below the calculated amount, the funder sends only the difference
Publish transaction: Uses cast publish to broadcast the pre-signed transaction
Verify deployment: Uses cast code to verify the contract was deployed to the correct address
Report results: Shows which contracts were deployed, funded, verified, and which already existed

Example Output

Loaded 4 pre-signed deployment(s).

Selected options:
  Target: l2
  L2 RPC: https://testnet.era.zksync.dev
  Dry run: no

Contracts to deploy:
  - Create2 Proxy (Arachnid) (create2_proxy_arachnid)
    Expected address: 0x4e59b44847b379578588920cA78FbF26c0B4956C
    Funding address:  0x3fAB184622Dc19b6109349B94811493BF2a45362
    Required amount:  0.01 ETH

[L2] Checking funding addresses and deploying contracts...
Funder address: 0xYourFunderAddress...

[L2] Create2 Proxy (Arachnid)
  Key: create2_proxy_arachnid
  Expected address: 0x4e59b44847b379578588920cA78FbF26c0B4956C
  Funding address: 0x3fAB184622Dc19b6109349B94811493BF2a45362
  Required funding: 0.01 ETH
  Funding balance: 0.000000 ETH (required: 0.01 ETH)
  ⚠ Insufficient balance. Funding address with 0.01 ETH...
  📤 Funding tx sent: 0xabcd...1234
  ✓ Funding confirmed
  ✓ Funded. Publishing pre-signed transaction...
  ✓ Published tx: 0x5678...9abc
  🔍 Verifying deployment...
  ✓ Verified: Contract deployed at 0x4e59b44847b379578588920cA78FbF26c0B4956C
  ✓ Code size: 69 bytes

============================================================
DEPLOYMENT SUMMARY
============================================================

[L2] Create2 Proxy (Arachnid)
  Key:              create2_proxy_arachnid
  Expected Address: 0x4e59b44847b379578588920cA78FbF26c0B4956C
  Funding Address:  0x3fAB184622Dc19b6109349B94811493BF2a45362
  Required Amount:  0.01 ETH
  Funded:           ✓ Yes
  Published:        ✓ Yes
  Transaction:      0x1234...5678

============================================================

✓ Successfully deployed 1 contract(s).

Automatic Funding

The script automatically handles funding with gas-aware amounts. When a deployment address doesn't have sufficient balance, the script will:

Call eth_estimateGas to simulate the deployment and get actual expected gas usage on this L2
Calculate the funding amount: estimatedGas × txGasPrice × (1 + gasBuffer%)
Send only the difference between what the deployer already holds and what it needs
Wait for the funding transaction to confirm
Proceed to publish the pre-signed deployment transaction

This means the deployer address receives only what it needs for the deployment rather than the hardcoded worst-case maximum, minimising leftover ETH in addresses with publicly known keys. If gas estimation fails for any reason, the script falls back to the hardcoded amount so the deployment is never blocked.

No manual intervention needed — just make sure your funder account has enough balance to cover the estimates.

Frequently Asked Questions

What does the funder account pay for?

Your funder account tops up the deployer addresses so they can pay gas when the pre-signed transactions are broadcast. The script estimates actual gas cost on the target L2 and sends only that amount plus a buffer — not the hardcoded worst-case maximum. Your account does NOT directly deploy the contracts; it just funds the special deployer addresses that do.

What happens if a deployer address has a non-zero nonce?

Each pre-signed transaction is signed with nonce 0. If a deployer address has already been used (nonce > 0), the pre-signed tx can never be broadcast and any ETH sent there would be stuck. The --gas-estimate flag checks every deployer nonce and warns loudly if any are non-zero before you send any funds.

What if the contract is already deployed?

The script automatically detects deployed contracts and skips them. You'll see a "✓ Already deployed" message and won't be charged anything.

What if the deployment address is already funded?

The script checks balances first and only sends funding if needed. If an address already has sufficient balance, it skips the funding step and proceeds directly to publish the pre-signed transaction.

How does verification work?

After each deployment, the script runs cast code <address> to verify that bytecode exists at the expected address. If no code is found, the deployment is marked as failed. The script also reports the code size for your reference.

Can I use this on custom base token networks?

Yes! The script works with any EVM-compatible L2, including those using custom base tokens. Just make sure your funder account has sufficient base token balance.

Why these specific amounts (0.01, 0.03, 0.1 ETH)?

Those are the hardcoded worst-case maximums baked into the pre-signed transactions (gasLimit × gasPrice). The script no longer sends those amounts blindly — it estimates actual gas usage on the target L2 first and only funds what is needed plus a buffer. On L2s, actual gas used is typically well below the limit, so the funder spends considerably less than the listed amounts.

Custom Base Token Networks

For networks using a custom base token (not ETH), the script will automatically use the base token. Just ensure your funder account has sufficient balance in that token.

Troubleshooting

`cast: command not found`

Install Foundry: https://book.getfoundry.sh/getting-started/installation

Missing funder private key

Set FUNDER_PRIVATE_KEY in your .env file or use --funder-private-key flag. This account will be used to automatically fund deployment addresses.

Transaction already exists

If you see an error about the transaction already existing, it likely means the contract is already deployed. The script should skip it automatically.

Failed to fund address

Your funder account doesn't have enough balance. Make sure it has sufficient ETH/base token to cover all deployment funding requirements (typically 0.49 ETH total for all 6 contracts).

Project Layout

contracts/vendor/ – Vendored upstream sources preserved verbatim for auditability
contracts/SingletonFactory.sol – Minimal ERC-2470 implementation used for compilation
scripts/build-bytecodes.ts – TypeScript script that compiles sources into artifacts
scripts/deploy-predeploys.ts – TypeScript CLI for deploying using ethers
artifacts/predeploy-bytecodes.json – Machine-readable compilation results
.env.example – Template showing required environment variables
package.json – Runtime and build-time dependencies

Contract Details

Key	Label	Compiler	Notes
`create2_proxy_arachnid`	Create2 Proxy (Arachnid)	`solc v0.5.8`	Minimal CREATE2 helper; salt in calldata slot 0, init code appended.
`create2_proxy_zoltu`	Create2 Proxy (Zoltu)	`solc v0.5.8`	Functionally identical bytecode to Arachnid/Safe version.
`erc2470_singleton_factory`	ERC2470 Singleton Factory	`solc v0.7.6`	Standard deterministic CREATE2 factory emitting `Deployed(addr,salt)`.
`multicall3`	Multicall3	`solc v0.8.12`	Aggregate multiple read-only calls in a single transaction.
`createx`	CreateX	`solc v0.8.23`	Full-featured factory supporting CREATE, CREATE2, and CREATE3 flows.
`universal_deployer`	Universal Deployer	`solc v0.6.10`	Deploys contracts to a deterministic address regardless of deployer; emits `Deployed(addr)`.

Manual Deployment (Advanced)

Note: The automated script handles all of this for you. These steps are provided for reference or manual deployment only.

If you need to manually deploy without the script:

Create2 Proxy (Arachnid)

# 1. Send 0.01 ETH to 0x3fAB184622Dc19b6109349B94811493BF2a45362
# 2. Publish the transaction
cast publish 0xf8a58085174876e800830186a08080b853604580600e600039806000f350fe7fffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffe03601600081602082378035828234f58015156039578182fd5b8082525050506014600cf31ba02222222222222222222222222222222222222222222222222222222222222222a02222222222222222222222222222222222222222222222222222222222222222 --rpc-url $L2_RPC_URL

ERC2470 Singleton Factory

# 1. Send 0.03 ETH to 0xBb6e024b9cFFACB947A71991E386681B1Cd1477D
# 2. Publish the transaction
cast publish 0xf9016c8085174876e8008303c4d88080b90154608060405234801561001057600080fd5b50610134806100206000396000f3fe6080604052348015600f57600080fd5b506004361060285760003560e01c80634af63f0214602d575b600080fd5b60cf60048036036040811015604157600080fd5b810190602081018135640100000000811115605b57600080fd5b820183602082011115606c57600080fd5b80359060200191846001830284011164010000000083111715608d57600080fd5b91908080601f016020809104026020016040519081016040528093929190818152602001838380828437600092019190915250929550509135925060eb915050565b604080516001600160a01b039092168252519081900360200190f35b6000818351602085016000f5939250505056fea26469706673582212206b44f8a82cb6b156bfcc3dc6aadd6df4eefd204bc928a4397fd15dacf6d5320564736f6c634300060200331b83247000822470 --rpc-url $L2_RPC_URL

Multicall3

# 1. Send 0.1 ETH to 0x05f32b3cc3888453ff71b01135b34ff8e41263f2
# 2. Publish the transaction
cast publish 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--rpc-url $L2_RPC_URL

Create2 Proxy (Zoltu)

# 1. Send 0.03 ETH to 0x4c8D290a1B368ac4728d83a9e8321fC3af2b39b1
# 2. Publish the transaction
cast publish 0xf87e8085174876e800830186a08080ad601f80600e600039806000f350fe60003681823780368234f58015156014578182fd5b80825250506014600cf31ba02222222222222222222222222222222222222222222222222222222222222222a02222222222222222222222222222222222222222222222222222222222222222 --rpc-url $L2_RPC_URL

CreateX

# 1. Send 0.3 ETH to 0xeD456e05CaAb11d66C4c797dD6c1D6f9A7F352b5
# 2. Publish the transaction (note: very long transaction, truncated for readability)
cast publish 0xf92f698085174876e800832dc6c08080b92f16... --rpc-url $L2_RPC_URL

Universal Deployer

# 1. Send 0.0217 ETH to 0x9c5a87452d4FAC0cbd53BDCA580b20A45526B3AB
# 2. Publish the transaction
cast publish 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 --rpc-url $L2_RPC_URL

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Pre-Deployment Scripts

Overview

Supported Contracts

Prerequisites

Setup

Usage

Gas Estimate (Pre-flight Check)

Dry Run (Check Status)

Deploy All Contracts

Deploy Specific Contracts

Adjusting the Gas Buffer

Interactive Mode

CLI Options

How It Works

Example Output

Automatic Funding

Frequently Asked Questions

What does the funder account pay for?

What happens if a deployer address has a non-zero nonce?

What if the contract is already deployed?

What if the deployment address is already funded?

How does verification work?

Can I use this on custom base token networks?

Why these specific amounts (0.01, 0.03, 0.1 ETH)?

Custom Base Token Networks

Troubleshooting

cast: command not found

Missing funder private key

Transaction already exists

Failed to fund address

Project Layout

Contract Details

Manual Deployment (Advanced)

Create2 Proxy (Arachnid)

ERC2470 Singleton Factory

Multicall3

Create2 Proxy (Zoltu)

CreateX

Universal Deployer

References

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