MarketPlace

Overview

MarketPlace is the core protocol contract implementing the ERC-6909 multi-token standard for decentralized content publishing and monetization. Unlike traditional approaches that deploy a separate ERC-20 contract for each post, MarketPlace manages all posts within a single contract using unique token IDs, providing significant gas savings and architectural simplicity.

Contract Details

  • Type: Upgradeable (Initializable)

  • Inherits:

    • PausableUpgradeable - Emergency stop mechanism

    • ReentrancyGuardUpgradeable - Protection against reentrancy attacks

    • ERC6909Upgradeable - Multi-token standard implementation

    • ERC6909TokenSupplyUpgradeable - Token supply tracking

  • Standard: ERC-6909 Multi-Token

  • Solidity Version: ^0.8.21

ERC-6909 Multi-Token Standard

What is ERC-6909?

ERC-6909 is a minimal multi-token interface that allows a single contract to manage multiple token types. Each token type is identified by a unique uint256 token ID.

Key Differences from ERC-20:

Feature
ERC-20
ERC-6909

Tokens per Contract

1

Unlimited

Contract Deployment

Per token

Once

Gas Cost

~2-3M per token

~200k per token

Balance Query

balanceOf(address)

balanceOf(address, uint256)

Transfer

transfer(to, amount)

transfer(to, id, amount)

Implementation in MarketPlace

  • Each post is assigned a unique token ID

  • Token IDs start from 1 (0 is reserved/invalid)

  • Subscribers receive 1 unit of the corresponding token ID

  • Tokens are non-transferable (soul-bound to subscriber)

  • All posts managed in a single contract

Resources

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