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Synthetic African Currency Exchange (SACE) — Whitepaper

Ticker: SACE
Creator: Simon Kapenda
Version: 1.0
Date: October 6, 2025

1. Abstract

The Synthetic African Currency Exchange (SACE) is a blockchain-native BEP-20 token engineered to represent a weighted basket of Africa’s top-performing currencies. By creating a synthetic currency index for Africa, SACE delivers a unified benchmark for tracking the continent’s currency strength. Inspired by the proven model of the U.S. Dollar Index (DXY), SACE offers a transparent, tradable instrument that reflects Africa’s collective economic performance, facilitates cross-border trade, and provides traders and investors a powerful tool for exposure and hedging within the African forex landscape.

SACE is a development brand of Abba Platforms Inc., created by Simon Kapenda, the creator of CillarCoin (CILLAR) — a utility token — and NADD, Namibia's first blockchain-native stablecoin pegged 1:1 to the Namibian Dollar. Simon Kapenda holds a Bachelor of Science degree in Economics from The Ohio State University in Columbus, Ohio, USA, where he graduated in 2008 alongside JD Vance, Vice President of the United States.

SACE will serve as:

  • A tradable synthetic index paired against USD or other basket currencies.
  • A transparent liquidity instrument for African currencies.
  • A governance-driven financial infrastructure to track Africa’s economic strength.

2. Project Vision

Africa is home to 54 countries with over 40 active currencies, each with unique macroeconomic drivers. SACE aggregates the top 21 most valuable currencies, creating a stable and transparent synthetic index to:

  • Increase intra-African trade efficiency.
  • Provide a unified reference point for African forex.
  • Empower financial products and derivatives.
  • Enable investors to hedge or gain exposure to African currency movements.

3. SACE Currency Basket

As of September 25, 2025, SACE’s initial basket includes:

# Currency
1 Tunisian Dinar (TND)
2 Libyan Dinar (LYD)
3 Moroccan Dirham (MAD)
4 Ghanaian Cedi (GHS)
5 Botswana Pula (BWP)
6 Seychelles Rupee (SCR)
7 Eritrean Nakfa (ERN)
8 Namibian Dollar (NAD)
9 Swazi Lilangeni (SZL)
10 South African Rand (ZAR)
11 Lesotho Loti (LSL)
12 São Tomé and Príncipe Dobra (STN)
13 Zambian Kwacha (ZMW)
14 Mauritanian Ouguiya (MRU)
15 Egyptian Pound (EGP)
16 Algerian Dinar (DZD)
17 Mauritian Rupee (MUR)
18 West African CFA Franc (XOF)
19 Central African CFA Franc (XAF)
20 Kenyan Shilling (KES)
21 Rwandan Franc (RWF)

4. Tokenomics

  • Token Name: Smart African Currency Exchange
  • Ticker: SACE
  • Total Supply: 10,000,000,000 SACE
  • Decimals: 18
  • Token Type: BEP-20 Upgradeable
  • Initial Mint: All tokens minted to Treasury Wallet upon deployment.

Treasury Wallet:

A single wallet address provided at deployment will hold the entire supply. The treasury manages distribution, liquidity, and governance.

5. Technical Design

SACE uses OpenZeppelin’s Upgradeable BEP-20 implementation, UUPS upgrade pattern, and integrates Chainlink Oracles for real-time currency rate feeds.

Key Features:

  1. Currency Basket Management — Dynamic add/remove currency logic.
  2. Weighted Index Calculation — Based on currency weights and rates.
  3. Deviation Protection — Ensures feed prices do not deviate beyond a configurable threshold.
  4. Oracle Heartbeat — Ensures price feeds are current.
  5. Upgradeable Contract — Governance controlled updates.
  6. Transparent Events — Logs all changes and updates.

6. Oracle Integration

SACE integrates Chainlink price feeds for all currencies.

Key features:

  • Heartbeat Check: Rejects stale feeds older than configurable time (default: 1 hour).
  • Deviation Check: Rejects sudden feed deviations beyond 5% by default.
  • Last Valid Price Storage: Maintains resilience against faulty or malicious feeds.
  • Feed Validation: Ensures valid feed addresses before updates.

7. Governance

SACE is governance-controlled via an ownership model with recommendations for:

  • Timelock mechanisms for sensitive operations.
  • Multi-sig wallets for treasury and upgrade control.
  • Basket rebalancing governance to adjust weights and currencies.
  • Deviation parameter control for Oracle protection.

8. Economic Impact

SACE creates a unified currency index for Africa with significant incentives:

  • Market Efficiency: Single tradable instrument for African forex exposure.
  • Hedging: Enables investors and institutions to hedge against African currency volatility.
  • Liquidity: Increases cross-border liquidity for African currencies.
  • Transparency: Provides clear tracking of African currency movements.

9. Conclusion

SACE is positioned to redefine African forex by introducing a single tradable synthetic currency representing Africa’s collective currency strength. It provides a powerful tool for traders, investors, and governments alike to measure, hedge, and trade African currencies in a standardized way.

Author: Simon Kapenda