CCA Deployment

Deploy Continuous Clearing Auction (CCA) smart contracts using the ContinuousClearingAuctionFactory with CREATE2 for consistent addresses across chains.

Runtime Compatibility: This skill uses AskUserQuestion for interactive prompts. If AskUserQuestion is not available in your runtime, collect the same parameters through natural language conversation instead.

Instructions for Claude Code

When the user invokes this skill, guide them through the CCA deployment process with appropriate safety warnings and validation.

Pre-Deployment Requirements

Before proceeding with deployment, you MUST:

Show educational disclaimer and get user acknowledgment
Validate configuration file if provided
Verify factory address for the target network
Confirm deployment parameters with user

Deployment Workflow

Show Educational Disclaimer (REQUIRED)
Load or Request Configuration
Validate Configuration
Display Deployment Plan
Get User Confirmation
Provide Deployment Commands
Post-Deployment Steps

⚠️ Educational Use Disclaimer

IMPORTANT: Before proceeding with deployment, you must acknowledge:

This tool and all deployment instructions are provided for educational purposes only. AI-generated deployment commands may contain errors or security vulnerabilities.

You must:

✅ Review all configurations carefully before deploying
✅ Verify all parameters (addresses, pricing, schedules) are correct
✅ Test on testnets first before deploying to mainnet
✅ Audit your contracts before deploying with real funds

Use AskUserQuestion to confirm the user acknowledges these warnings before proceeding with deployment steps.

Input Validation Rules

Before interpolating ANY user-provided value into forge/cast commands or deployment scripts:

Ethereum addresses: MUST match ^0x[a-fA-F0-9]{40}$ — reject otherwise
Chain IDs: MUST be from the supported chains list (1, 130, 143, 1301, 8453, 42161, 11155111)
Numeric values (supply, prices, blocks, chain IDs): MUST be non-negative and match ^[0-9]+.?[0-9]*$
REJECT any input containing shell metacharacters: ; , | , & , $ , ` , ( , ) , > , < ,
, ' , " , newlines
Never pass raw user input directly to shell commands without validation

⚠️ Permission Safety

Do NOT auto-approve Bash(forge:) or Bash(cast:) in your Claude Code settings. Always require per-invocation approval for commands that spend gas or broadcast transactions. The PreToolUse hooks in .claude/hooks/ provide programmatic validation as a safety net, but user approval per command is the primary control.

🔐 Private Key Security

CRITICAL: Handling private keys safely is essential for secure deployments.

⚠️ Never Do These

❌ Never store private keys in git repositories or config files
❌ Never paste private keys directly in command line (visible in shell history)
❌ Never share private keys or store them in shared environments
❌ Never use mainnet private keys on untrusted computers
❌ Never use --private-key flag (blocked by PreToolUse hook)

✅ Recommended Practices

Option 1: Hardware Wallets (Most Secure)

Use Ledger or Trezor hardware wallets with the --ledger flag:

forge script script/Example.s.sol:ExampleScript
--rpc-url $RPC_URL
--broadcast
--ledger

Option 2: Encrypted Keystore

Create an encrypted keystore with cast wallet import :

Import private key to encrypted keystore (one-time setup)

cast wallet import deployer --interactive

Use keystore for deployment

forge script script/Example.s.sol:ExampleScript
--rpc-url $RPC_URL
--broadcast
--account deployer
--sender $DEPLOYER_ADDRESS

Option 3: Environment Variables (For Testing Only)

If using environment variables, ensure they are:

Set in a secure .env file (never committed to git)
Loaded via source .env or dotenv
Only used on trusted, secure computers
Use testnet keys for development

Example:

.env file (add to .gitignore)

PRIVATE_KEY=0x... RPC_URL=https://...

Load environment

source .env

Deploy (use encrypted keystore instead of --private-key)

cast wallet import deployer --interactive forge script ... --account deployer --sender $DEPLOYER_ADDRESS

Testnet First

Always test on testnets before mainnet:

Sepolia (testnet): Get free ETH from faucets
Base Sepolia: Free ETH for testing on Base
Deploy and verify full workflow on testnet
Only deploy to mainnet after thorough testing

Deployment Guide

Factory Deployment

CCA instances are deployed via the ContinuousClearingAuctionFactory contract, which uses CREATE2 for consistent addresses across chains.

Factory Addresses

Version Address Status

v1.1.0 0xCCccCcCAE7503Cac057829BF2811De42E16e0bD5

Recommended

Deploying an Auction Instance

Step 0: Clone the CCA Repository

If you don't already have the CCA contracts locally, clone the repository and install dependencies:

git clone https://github.com/Uniswap/continuous-clearing-auction.git cd continuous-clearing-auction forge install

This gives you access to the deployment scripts, contract ABIs, and test helpers referenced in later steps.

Step 1: Prepare Configuration

Ensure you have a valid configuration file (generated via the configurator skill or manually created).

Example configuration file structure:

{ "1": { "token": "0x...", "totalSupply": 1e29, "currency": "0x0000000000000000000000000000000000000000", "tokensRecipient": "0x...", "fundsRecipient": "0x...", "startBlock": 24321000, "endBlock": 24327001, "claimBlock": 24327001, "tickSpacing": 79228162514264337593543950, "validationHook": "0x0000000000000000000000000000000000000000", "floorPrice": 7922816251426433759354395000, "requiredCurrencyRaised": 0, "supplySchedule": [ { "mps": 1000, "blockDelta": 6000 }, { "mps": 4000000, "blockDelta": 1 } ] } }

Step 2: Validate Configuration

Before deployment, verify the configuration passes all validation rules (see Validation Rules section).

Step 3: Deploy via Factory

The factory has a simple interface:

function initializeDistribution( address token, uint256 amount, bytes calldata configData, bytes32 salt ) external returns (IDistributionContract);

Where:

token : Address of the token to be sold
amount : Amount of tokens to sell in the auction
configData : ABI-encoded AuctionParameters struct
salt : Optional bytes32 value for vanity address mining

Step 3.5: Encode Configuration to configData

The factory's initializeDistribution expects configData as ABI-encoded AuctionParameters . Convert your JSON config to encoded bytes:

Using cast (Foundry CLI):

Encode the AuctionParameters struct

cast abi-encode "initializeDistribution(address,uint256,bytes,bytes32)"
"$TOKEN_ADDRESS"
"$TOTAL_SUPPLY"
"$(cast abi-encode "(address,address,address,uint64,uint64,uint64,uint256,address,uint256,uint128,bytes)"
"$CURRENCY"
"$TOKENS_RECIPIENT"
"$FUNDS_RECIPIENT"
"$START_BLOCK"
"$END_BLOCK"
"$CLAIM_BLOCK"
"$TICK_SPACING"
"$VALIDATION_HOOK"
"$FLOOR_PRICE"
"$REQUIRED_CURRENCY_RAISED"
"$ENCODED_SUPPLY_SCHEDULE")"
"0x0000000000000000000000000000000000000000000000000000000000000000"

Using a Foundry Script:

// script/DeployAuction.s.sol pragma solidity ^0.8.24;

import "forge-std/Script.sol";

interface ICCAFactory { function initializeDistribution( address token, uint256 amount, bytes calldata configData, bytes32 salt ) external returns (address); }

contract DeployAuction is Script { function run() external { // Load config values address token = vm.envAddress("TOKEN"); uint256 amount = vm.envUint("TOTAL_SUPPLY");

    // Encode AuctionParameters
    bytes memory configData = abi.encode(
        vm.envAddress("CURRENCY"),
        vm.envAddress("TOKENS_RECIPIENT"),
        vm.envAddress("FUNDS_RECIPIENT"),
        uint64(vm.envUint("START_BLOCK")),
        uint64(vm.envUint("END_BLOCK")),
        uint64(vm.envUint("CLAIM_BLOCK")),
        vm.envUint("TICK_SPACING"),
        vm.envAddress("VALIDATION_HOOK"),
        vm.envUint("FLOOR_PRICE"),
        uint128(vm.envUint("REQUIRED_CURRENCY_RAISED")),
        vm.envBytes("ENCODED_SUPPLY_SCHEDULE")
    );

    vm.startBroadcast();

    // Approve token transfer to factory
    IERC20(token).approve(
        0xCCccCcCAE7503Cac057829BF2811De42E16e0bD5,
        amount
    );

    // Deploy auction
    address auction = ICCAFactory(
        0xCCccCcCAE7503Cac057829BF2811De42E16e0bD5
    ).initializeDistribution(
        token,
        amount,
        configData,
        bytes32(0) // salt
    );

    vm.stopBroadcast();

    console.log("Auction deployed at:", auction);
}

}

Important: You must approve the token transfer to the factory before calling initializeDistribution . The factory will transfer amount tokens from your address to the newly created auction contract.

Step 4: Using Foundry Script

Deploy factory (if needed on new network)

forge script script/deploy/DeployContinuousAuctionFactory.s.sol:DeployContinuousAuctionFactoryScript
--rpc-url $RPC_URL
--broadcast
--account deployer --sender $DEPLOYER_ADDRESS

Deploy auction instance

forge script script/Example.s.sol:ExampleScript
--rpc-url $RPC_URL
--broadcast
--account deployer --sender $DEPLOYER_ADDRESS

Step 5: Post-Deployment

After deployment, you must call onTokensReceived() to notify the auction that tokens have been transferred:

cast send $AUCTION_ADDRESS "onTokensReceived()" --rpc-url $RPC_URL --account deployer --sender $DEPLOYER_ADDRESS

This is a required prerequisite before the auction can accept bids.

Alternative: Deploy via Constructor

You can also deploy directly via the constructor:

constructor( address token, uint128 amount, AuctionParameters memory parameters ) {}

This approach doesn't require a salt parameter but won't benefit from CREATE2's deterministic addressing.

Verification on Block Explorers

Generate standard JSON input for verification:

forge verify-contract $AUCTION_ADDRESS
src/ContinuousClearingAuction.sol:ContinuousClearingAuction
--rpc-url $RPC_URL
--show-standard-json-input > standard-json-input.json

Upload this file to block explorers for verification.

Validation Rules

Before deployment, ensure:

Block constraints: startBlock < endBlock <= claimBlock
Valid addresses: All addresses are valid Ethereum addresses (0x + 40 hex chars)
Non-negative values: All numeric values >= 0
Floor price alignment: Floor price must be a multiple of tick spacing
Tick spacing: At least 1 basis point of floor price (1%, 10% recommended)
Supply schedule: Last block sells significant tokens (~30%+)
Total supply bounds: Max 1e30 wei (1 trillion 18-decimal tokens)
No FoT tokens: Fee-on-transfer tokens not supported
Minimum decimals: Do not use tokens with < 6 decimals

Technical Overview

Q96 Fixed-Point Math

The auction uses Q96 fixed-point arithmetic:

library FixedPoint96 { uint8 internal constant RESOLUTION = 96; uint256 internal constant Q96 = 0x1000000000000000000000000; // 2^96 }

Price: Q96 fixed-point number for fractional price ratios
Demand: Currency amounts scaled by Q96

Auction Steps (Supply Issuance)

Steps are packed into bytes, where each step is a uint64 :

First 24 bits: mps (per-block issuance rate in MPS)
Last 40 bits: blockDelta (number of blocks)

function parse(bytes8 data) internal pure returns (uint24 mps, uint40 blockDelta) { mps = uint24(bytes3(data)); blockDelta = uint40(uint64(data)); }

The data is deployed to an external SSTORE2 contract for cheaper reads.

Key Contract Functions

submitBid()

Users submit bids with:

maxPrice : Maximum price willing to pay (Q96)
amount : Currency amount to bid
owner : Address to receive tokens/refunds
prevTickPrice : Hint for gas optimization
hookData : Optional data for validation hooks

checkpoint()

Auction is checkpointed once per block with a new bid. Checkpoints determine token allocations.

exitBid() / exitPartiallyFilledBid()

Bids can be exited when outbid or when auction ends (only after graduation).

isGraduated()

Returns true if currencyRaised >= requiredCurrencyRaised . No bids can exit before graduation.

claimTokens()

Users claim purchased tokens after claimBlock (only for graduated auctions).

sweepCurrency() / sweepUnsoldTokens()

After auction ends:

sweepCurrency() : Withdraw raised currency (graduated only)
sweepUnsoldTokens() : Withdraw unsold tokens

Supported Chains

CCA is deployed to canonical addresses across select EVM chains:

Chain ID Network Block Time

1 Mainnet 12s

130 Unichain 1s

1301 Unichain Sepolia 2s

8453 Base 2s

42161 Arbitrum 2s

11155111 Sepolia 12s

Troubleshooting

Common Issues

Issue Solution

"Invalid block sequence" Ensure startBlock < endBlock <= claimBlock

"Floor price not aligned" Round floor price to multiple of tick spacing

"Tick spacing too small" Use at least 1% of floor price

"Total supply too large" Max 1e30 wei (1 trillion 18-decimal tokens)

"Gas inefficiency" Increase tick spacing

"Invalid address" Verify addresses are 42 characters starting with 0x

Validation Checklist

Before deployment:

Block sequence is valid (start < end <= claim)
Floor price is multiple of tick spacing
Tick spacing >= 1% of floor price
All addresses are valid Ethereum addresses
Total supply <= 1e30 wei
Currency is more valuable than token
Block times match network (12s mainnet, 2s L2s)
Recipients addresses are set (not placeholders)
Currency address is correct for network
Last supply step sells ~30%+ of tokens
No fee-on-transfer tokens used
Token decimals >= 6
onTokensReceived() called post-deployment

Additional Resources

CCA Repository: https://github.com/Uniswap/continuous-clearing-auction
Technical Documentation: See docs/TechnicalDocumentation.md in repo
Deployment Guide: See docs/DeploymentGuide.md in repo
Whitepaper: See docs/assets/whitepaper.pdf in repo
Audits: See docs/audits/README.md in repo
Uniswap Docs: https://docs.uniswap.org/contracts/liquidity-launchpad/CCA
Bug Bounty: https://cantina.xyz/code/f9df94db-c7b1-434b-bb06-d1360abdd1be/overview

deployer

Safety Notice

Copy this and send it to your AI assistant to learn

Import private key to encrypted keystore (one-time setup)

Use keystore for deployment

.env file (add to .gitignore)

Load environment

Deploy (use encrypted keystore instead of --private-key)

Encode the AuctionParameters struct

Deploy factory (if needed on new network)

Deploy auction instance

Source Transparency

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