Tiered Access Contract — Sub Protocol

Description

Smart contract for bronze/silver/gold tier access with upgrade paths. Each tier has configurable features, pricing, and duration. Users can upgrade by paying the difference. Downgrades refund pro-rata.

Details

Category: contracts
Files: 11
Chains: Ethereum, Arbitrum, Base, Optimism, Polygon

Solidity ^0.8.24 OpenZeppelin v5 Foundry Ethereum Arbitrum Base Optimism Polygon

Three default tiers: Bronze, Silver, Gold (extensible)
Configurable features per tier (bitmask pattern)
Upgrade by paying price difference
Pro-rata downgrade refunds
Tier duration with auto-expiry
On-chain feature flag checking
Ownable2Step governance
Full Foundry test suite with upgrade/downgrade scenarios

tiered-access-contract.sol

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.24;

import "@openzeppelin/contracts/token/ERC20/IERC20.sol";

/// @title Tiered Access Contract
/// @notice Smart contract for bronze/silver/gold tier access with upgrades.
contract TieredAccessContract {
    address public immutable owner;
    uint256 public constant VERSION = 1;

    event Initialized(address indexed deployer);

    constructor() {
        owner = msg.sender;
        emit Initialized(msg.sender);
    }

    // ... full implementation in purchased package
}