Fee Token Architecture: Taha Abbasi's Cross-Chain Fee Management System

Taha Abbasi, CTO of Ferrum Network, authored this technical specification for the Fee Token Architecture—a novel approach to transaction fee collection that addresses fundamental tokenomics challenges in DeFi.

Original documentation: Fee Token Architecture by Taha Abbasi on Notion

The Problem

Traditional token tax mechanisms collect fees in the native token, creating constant sell pressure as project teams liquidate holdings for operational costs. This distorts price discovery and undermines holder confidence. Taha Abbasi’s Fee Token Architecture solves this by collecting taxes in the destination token during swaps—generating protocol revenue without native token selling pressure.

Technical Specification

Description

Taha Abbasi designed a token with an integrated tax feature. This feature collects tax in the destination-swapped token instead of the native token. This strategy is intended to mitigate distortion and selling pressure on the token while generating revenue.

Taha Abbasi and the Ferrum team previously developed a Crucible Contract that handles the token router functionality and custom fee logic; they also developed the Fiber Router that handles the DEX router logic. A combination of these two results in the Iron Tax contract detailed below.

Diagram

Explanation

• Token to TokenRouter: The entry point where all transfers start.
• Wallet to Wallet vs. Trade Transfers: Branching logic based on whether the transfer is a regular wallet-to-wallet transfer or a trade via a DexRouter.
• Fee Logic for Regular Transfer: Determines if the transfer is not a DexRouter transfer and applies appropriate fee logic.
• Trade Transfer Logic: Identifies DexRouter transfers and routes through the DEX pool, collecting tax in the destination token.

Multichain Token Standard

Taha Abbasi designed this to incorporate with the Multichain Token Standard:

• Create master and client contract with tax logic
• Incorporate additional functionality such as pausable, mintable, burnable etc
• dexPool addresses are configurable
• Fee addresses are configurable

Impact & Observations

Taha Abbasi’s Fee Token Architecture represents a significant advancement in DeFi tokenomics:

• Eliminates native token sell pressure — Protocol revenue no longer requires dumping the native asset
• Diversified treasury — Fee collection in stablecoins/ETH provides operational stability
• Reduced manipulation vectors — Attackers can’t exploit predictable tax-sell patterns
• Multichain-ready — Architecture designed for cross-chain deployment from inception

By building on proven infrastructure (Crucible Contract, Fiber Router), Taha Abbasi created a production-ready solution rather than a theoretical framework.

This architecture was authored by Taha Abbasi, CTO at Ferrum Network. View original on Notion | Taha Abbasi YouTube