---

name: jb-project description: Create and configure Juicebox V5 projects. Generate deployment scripts for launching projects with rulesets, terminals, and splits using JBController. Also helps with project ownership transfer and metadata updates.

Juicebox V5 Project Management

Create and manage Juicebox V5 projects including deployment, configuration, and ownership.

Project Identity

A Juicebox project is uniquely identified by: projectId + chainId + version

This matters because:

• V4 and V5 are different protocols. Project #64 on V4 is NOT the same as Project #64 on V5, even on the same chain.
• Project IDs cannot be coordinated across chains. Each chain assigns the next available ID independently. If you deploy to Ethereum you might get project #42, and deploying to Optimism might give you project #17.
• Suckers link projects across chains. To create an "omnichain project," you deploy separate projects on each chain (with different IDs) and connect them using Suckers. This enables token bridging while maintaining treasury backing.
• When referencing a project, always specify the version and chain to avoid confusion.

V5.1 Contract Update (Dec 2025)

Only JBRulesets has a code change (one-line approval hook fix). Other contracts were redeployed due to dependency chains (JBTerminalStore→JBMultiTerminal, JB721TiersHook→JB721TiersHookDeployer→JBOmnichainDeployer).

Deploying...	Use These Contracts
New project	V5.1 (JBController5_1, JBMultiTerminal5_1, etc.)
Revnet	V5.0 (REVDeployer uses V5.0 JBController)

Do not mix V5.0 and V5.1 contracts - use one complete set or the other.

See references/v5-addresses.md or shared/chain-config.json for addresses.

Before Writing Custom Code

Always check if native mechanics can achieve your goal:

User Need	Recommended Solution
Autonomous tokenized treasury	Deploy a Revnet via revnet-core-v5
Project with structured rules and no EOA owner	Use contract-as-owner pattern
Simple fundraising project	Use this skill to generate deployment
Vesting/time-locked distributions	Use payout limits + cycling rulesets (no custom contracts)
NFT-gated treasury	Use nana-721-hook-v5 with native cash outs
Governance-minimal/immutable	Transfer ownership to burn address after setup
One-time treasury access	Use surplus allowance (doesn't reset each cycle)
Custom token mechanics	Use custom ERC20 via setTokenFor()

See /jb-patterns for detailed examples of these patterns. See /jb-simplify for a checklist to reduce custom code.

Project Creation Overview

Projects are created through JBController.launchProjectFor() which:

1. Creates a new project NFT via JBProjects
2. Sets the controller for the project
3. Configures the first ruleset
4. Sets up terminal configurations

Core Functions

Launch a Project

function launchProjectFor(
    address owner,                              // Project owner (receives NFT)
    string calldata projectUri,                 // IPFS metadata URI
    JBRulesetConfig[] calldata rulesetConfigs,  // Initial ruleset(s)
    JBTerminalConfig[] calldata terminalConfigs, // Terminal setup
    string calldata memo                        // Launch memo
) external returns (uint256 projectId);

Project Metadata (projectUri)

The projectUri should point to a JSON file (typically on IPFS) with:

{
  "name": "Project Name",
  "description": "Project description",
  "logoUri": "ipfs://...",
  "infoUri": "https://...",
  "twitter": "@handle",
  "discord": "https://discord.gg/...",
  "telegram": "https://t.me/..."
}

Configuration Structs

JBRulesetConfig

struct JBRulesetConfig {
    uint256 mustStartAtOrAfter;     // Earliest start time (0 = now)
    uint256 duration;               // Duration in seconds (0 = indefinite)
    uint256 weight;                 // Token minting weight (18 decimals)
    uint256 weightCutPercent;       // Weight cut per cycle (0-1000000000)
    IJBRulesetApprovalHook approvalHook;  // Approval hook (e.g., JBDeadline)
    JBRulesetMetadata metadata;     // Ruleset settings
    JBSplitGroup[] splitGroups;     // Payout and reserved splits
    JBFundAccessLimitGroup[] fundAccessLimitGroups;  // Payout limits
}

JBTerminalConfig

struct JBTerminalConfig {
    IJBTerminal terminal;                   // Terminal contract
    JBAccountingContext[] accountingContexts;  // Accepted tokens
}

JBAccountingContext

struct JBAccountingContext {
    address token;          // Token address (address(0) for native)
    uint8 decimals;         // Token decimals
    uint32 currency;        // Currency ID for accounting
}

Deployment Script Example

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.23;

import {Script} from "forge-std/Script.sol";
import {IJBController} from "@bananapus/core/src/interfaces/IJBController.sol";
import {IJBMultiTerminal} from "@bananapus/core/src/interfaces/IJBMultiTerminal.sol";
import {JBRulesetConfig} from "@bananapus/core/src/structs/JBRulesetConfig.sol";
import {JBRulesetMetadata} from "@bananapus/core/src/structs/JBRulesetMetadata.sol";
import {JBTerminalConfig} from "@bananapus/core/src/structs/JBTerminalConfig.sol";
import {JBAccountingContext} from "@bananapus/core/src/structs/JBAccountingContext.sol";
import {JBSplitGroup} from "@bananapus/core/src/structs/JBSplitGroup.sol";
import {JBSplit} from "@bananapus/core/src/structs/JBSplit.sol";
import {JBFundAccessLimitGroup} from "@bananapus/core/src/structs/JBFundAccessLimitGroup.sol";
import {JBCurrencyAmount} from "@bananapus/core/src/structs/JBCurrencyAmount.sol";
import {JBConstants} from "@bananapus/core/src/libraries/JBConstants.sol";

contract DeployProject is Script {
    // V5.1 Mainnet Addresses (use for new projects)
    // See /references/v5-addresses.md for all networks
    // NOTE: For revnets, use V5.0 addresses instead
    IJBController constant CONTROLLER = IJBController(0xf3cc99b11bd73a2e3b8815fb85fe0381b29987e1);
    IJBMultiTerminal constant TERMINAL = IJBMultiTerminal(0x52869db3d61dde1e391967f2ce5039ad0ecd371c);

    function run() external {
        vm.startBroadcast();

        // Configure ruleset metadata
        JBRulesetMetadata memory metadata = JBRulesetMetadata({
            reservedRate: 0,                    // No reserved tokens
            cashOutTaxRate: 0,                  // No cash out tax
            baseCurrency: uint32(uint160(JBConstants.NATIVE_TOKEN)),
            pausePay: false,
            pauseCashOut: false,
            pauseTransfers: false,
            allowOwnerMinting: false,
            allowTerminalMigration: false,
            allowSetTerminals: false,
            allowSetController: false,
            allowAddAccountingContexts: false,
            allowAddPriceFeed: false,
            ownerMustSendPayouts: false,
            holdFees: false,
            useTotalSurplusForCashOuts: false,
            useDataHookForPay: false,
            useDataHookForCashOut: false,
            dataHook: address(0),
            metadata: 0
        });

        // Configure splits (empty for now)
        JBSplitGroup[] memory splitGroups = new JBSplitGroup[](0);

        // Configure fund access limits
        JBFundAccessLimitGroup[] memory fundAccessLimits = new JBFundAccessLimitGroup[](0);

        // Build ruleset config
        JBRulesetConfig[] memory rulesetConfigs = new JBRulesetConfig[](1);
        rulesetConfigs[0] = JBRulesetConfig({
            mustStartAtOrAfter: 0,
            duration: 0,                        // Indefinite
            weight: 1e18,                       // 1 token per unit paid
            weightCutPercent: 0,                // No weight cut
            approvalHook: IJBRulesetApprovalHook(address(0)),
            metadata: metadata,
            splitGroups: splitGroups,
            fundAccessLimitGroups: fundAccessLimits
        });

        // Configure terminal to accept ETH
        JBAccountingContext[] memory accountingContexts = new JBAccountingContext[](1);
        accountingContexts[0] = JBAccountingContext({
            token: JBConstants.NATIVE_TOKEN,
            decimals: 18,
            currency: uint32(uint160(JBConstants.NATIVE_TOKEN))
        });

        JBTerminalConfig[] memory terminalConfigs = new JBTerminalConfig[](1);
        terminalConfigs[0] = JBTerminalConfig({
            terminal: TERMINAL,
            accountingContexts: accountingContexts
        });

        // Launch the project
        uint256 projectId = CONTROLLER.launchProjectFor(
            msg.sender,                         // Owner
            "ipfs://...",                       // Project metadata URI
            rulesetConfigs,
            terminalConfigs,
            "Project launch"                    // Memo
        );

        vm.stopBroadcast();
    }
}

Custom ERC20 Project Tokens

By default, Juicebox projects use credits (unclaimed internal balances). You can upgrade to an ERC20 token two ways:

Option 1: Deploy Standard JBERC20

// Deploy the default Juicebox ERC20 token
IJBToken token = CONTROLLER.deployERC20For(
    projectId,
    "Project Token",    // name
    "PROJ",             // symbol
    bytes32(0)          // salt (for deterministic address, or 0)
);

This creates a standard JBERC20 that the controller can mint/burn. Simple and works for most projects.

Option 2: Use a Custom ERC20

For advanced tokenomics, you can bring your own ERC20:

// Set an existing/custom ERC20 as the project token
CONTROLLER.setTokenFor(projectId, IJBToken(myCustomToken));

Requirements for custom tokens:

1. Must use 18 decimals
2. Must implement canBeAddedTo(uint256 projectId) returning true
3. Must not be assigned to another Juicebox project
4. Controller needs mint/burn permissions (typically via ownership or access control)

Custom Token Interface

interface IJBToken is IERC20 {
    /// @notice Verify this token can be added to a project.
    /// @param projectId The project ID to check.
    /// @return True if the token can be added.
    function canBeAddedTo(uint256 projectId) external view returns (bool);

    /// @notice Mint tokens to an account.
    /// @param holder The account to mint to.
    /// @param amount The amount to mint.
    function mint(address holder, uint256 amount) external;

    /// @notice Burn tokens from an account.
    /// @param holder The account to burn from.
    /// @param amount The amount to burn.
    function burn(address holder, uint256 amount) external;
}

When to Use Custom ERC20s

Use Case	Why Custom ERC20
Transfer taxes	Implement fees on transfers (e.g., reflection tokens)
Rebasing tokens	Elastic supply that adjusts balances automatically
Pre-existing tokens	Integrate a community token with established holders
Governance features	Voting snapshots, delegation, checkpointing
Vesting schedules	Built-in unlock mechanics in the token itself
Allowlist/denylist	Transfer restrictions for compliance
Concentration limits	Cap max holdings per address for distribution
Editable metadata	Rebrand name/symbol without redeploying

Example: Custom Token with Transfer Tax

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.23;

import {ERC20} from "@openzeppelin/contracts/token/ERC20/ERC20.sol";
import {Ownable} from "@openzeppelin/contracts/access/Ownable.sol";

contract TaxedProjectToken is ERC20, Ownable {
    uint256 public constant TAX_RATE = 100; // 1% (basis points)
    uint256 public constant TAX_DENOMINATOR = 10000;
    address public taxRecipient;
    address public controller;
    uint256 public projectId;

    constructor(
        string memory name,
        string memory symbol,
        address _controller,
        uint256 _projectId,
        address _taxRecipient
    ) ERC20(name, symbol) Ownable(msg.sender) {
        controller = _controller;
        projectId = _projectId;
        taxRecipient = _taxRecipient;
    }

    function decimals() public pure override returns (uint8) {
        return 18; // REQUIRED: Must be 18 decimals
    }

    function canBeAddedTo(uint256 _projectId) external view returns (bool) {
        return _projectId == projectId; // Only allow for our project
    }

    function mint(address holder, uint256 amount) external {
        require(msg.sender == controller, "Only controller");
        _mint(holder, amount);
    }

    function burn(address holder, uint256 amount) external {
        require(msg.sender == controller || msg.sender == holder, "Not authorized");
        _burn(holder, amount);
    }

    function _update(address from, address to, uint256 amount) internal override {
        // Skip tax for mints, burns, and controller operations
        if (from == address(0) || to == address(0) || msg.sender == controller) {
            super._update(from, to, amount);
            return;
        }

        // Apply transfer tax
        uint256 tax = (amount * TAX_RATE) / TAX_DENOMINATOR;
        uint256 netAmount = amount - tax;

        super._update(from, taxRecipient, tax);
        super._update(from, to, netAmount);
    }
}

Example: Integrating Existing Community Token

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.23;

import {ERC20} from "@openzeppelin/contracts/token/ERC20/ERC20.sol";
import {AccessControl} from "@openzeppelin/contracts/access/AccessControl.sol";

/// @notice Wrapper to make an existing token compatible with Juicebox.
/// @dev For tokens that already exist - create a wrapper that the JB controller can mint.
contract JBCompatibleToken is ERC20, AccessControl {
    bytes32 public constant MINTER_ROLE = keccak256("MINTER_ROLE");
    uint256 public immutable targetProjectId;

    constructor(
        string memory name,
        string memory symbol,
        uint256 _projectId,
        address controller
    ) ERC20(name, symbol) {
        targetProjectId = _projectId;
        _grantRole(DEFAULT_ADMIN_ROLE, msg.sender);
        _grantRole(MINTER_ROLE, controller);
    }

    function decimals() public pure override returns (uint8) {
        return 18;
    }

    function canBeAddedTo(uint256 projectId) external view returns (bool) {
        return projectId == targetProjectId;
    }

    function mint(address to, uint256 amount) external onlyRole(MINTER_ROLE) {
        _mint(to, amount);
    }

    function burn(address from, uint256 amount) external onlyRole(MINTER_ROLE) {
        _burn(from, amount);
    }
}

Example: Editable Name/Symbol Token

Allows project owners to rebrand without redeploying or migrating liquidity:

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.23;

import {ERC20} from "@openzeppelin/contracts/token/ERC20/ERC20.sol";
import {IJBProjects} from "@bananapus/core/src/interfaces/IJBProjects.sol";

contract EditableProjectToken is ERC20 {
    IJBProjects public immutable PROJECTS;
    address public immutable controller;
    uint256 public immutable projectId;

    string private _tokenName;
    string private _tokenSymbol;

    event NameUpdated(string oldName, string newName);
    event SymbolUpdated(string oldSymbol, string newSymbol);

    constructor(
        string memory initialName,
        string memory initialSymbol,
        address _controller,
        uint256 _projectId,
        IJBProjects projects
    ) ERC20(initialName, initialSymbol) {
        _tokenName = initialName;
        _tokenSymbol = initialSymbol;
        controller = _controller;
        projectId = _projectId;
        PROJECTS = projects;
    }

    modifier onlyProjectOwner() {
        require(msg.sender == PROJECTS.ownerOf(projectId), "NOT_OWNER");
        _;
    }

    function name() public view override returns (string memory) { return _tokenName; }
    function symbol() public view override returns (string memory) { return _tokenSymbol; }
    function decimals() public pure override returns (uint8) { return 18; }

    function canBeAddedTo(uint256 _projectId) external view returns (bool) {
        return _projectId == projectId;
    }

    function mint(address to, uint256 amount) external {
        require(msg.sender == controller, "UNAUTHORIZED");
        _mint(to, amount);
    }

    function burn(address from, uint256 amount) external {
        require(msg.sender == controller, "UNAUTHORIZED");
        _burn(from, amount);
    }

    /// @notice Update token name. Only callable by project owner.
    function setName(string calldata newName) external onlyProjectOwner {
        emit NameUpdated(_tokenName, newName);
        _tokenName = newName;
    }

    /// @notice Update token symbol. Only callable by project owner.
    function setSymbol(string calldata newSymbol) external onlyProjectOwner {
        emit SymbolUpdated(_tokenSymbol, newSymbol);
        _tokenSymbol = newSymbol;
    }
}

Note: Some DEXs/aggregators cache metadata. Changes may take time to propagate.

Tradeoffs

Approach	Pros	Cons
Credits only	Zero deployment cost, simplest	Not transferable, no DeFi integration
Standard JBERC20	Simple, compatible, audited	No custom mechanics
Custom ERC20	Full control over tokenomics	More complexity, audit burden, must maintain 18 decimals

Critical Considerations

1. Controller must have mint/burn access - The JBController needs to mint tokens on payments and burn on cash outs
2. 18 decimals is mandatory - The entire Juicebox math assumes 18 decimal tokens
3. One token per project - A token can only be assigned to one project
4. Credits convert to tokens - Existing credit holders can claim tokens after ERC20 is set
5. Token can't be changed - Once set, you cannot swap to a different token contract

Other Project Operations

Transfer Ownership

Project ownership is an ERC-721 NFT. Transfer using standard ERC-721:

IJBProjects(PROJECTS).transferFrom(currentOwner, newOwner, projectId);

Set Project Metadata

IJBProjects(PROJECTS).setTokenURI(projectId, "ipfs://newUri");

Add Terminals

IJBDirectory(DIRECTORY).setTerminalsOf(projectId, terminals);

Generation Guidelines

1. Ask about project requirements - ownership model, token economics, payout structure
2. Consider Revnets if autonomous operation is desired
3. Configure appropriate metadata - reserved rate, cash out tax, permissions
4. Set up splits for payouts and reserved tokens
5. Generate deployment scripts using Foundry

Example Prompts

• "Create a project that mints 1000 tokens per ETH with 10% reserved"
• "Set up a project with weekly payout cycles to 3 addresses"
• "Deploy a project with a 3-day approval delay for ruleset changes"
• "Create a project that accepts both ETH and USDC"

Reference

• nana-core-v5: https://github.com/Bananapus/nana-core-v5
• revnet-core-v5: https://github.com/rev-net/revnet-core-v5