Question 1

What is a ROSCA?

Accepted Answer

A ROSCA (Rotating Savings and Credit Association) is a traditional group savings mechanism where a circle of participants pools money each period and each member receives the pooled funds in turn until everyone has been paid. Known as njangi in Cameroon, tontine in Francophone Africa, susu in Ghana, or chama in East Africa — it is one of the oldest forms of community finance, dating back over 2,000 years across Africa.

Question 2

How does Njangi House work?

Accepted Answer

Njangi House digitizes the ROSCA process on Polygon blockchain. A group of 2–20 members creates a House and sets a contribution amount, frequency (weekly, bi-weekly, or monthly), and payout order. Each round, one member receives the full pooled amount on-chain. Smart contracts automate contributions, tracking, and payouts — no manual coordination needed. On-time contributors earn $NKAP governance tokens and optional yield via Aave v3.

Question 3

Do I need a crypto wallet to participate?

Accepted Answer

No. The Mobile Money bridge (launching Q3 2026) allows participants to contribute via MTN Mobile Money or Orange Money with no crypto wallet required. The oracle bridge converts local currency (XAF, GHS, NGN, KES) to USDC on-chain at live FX rates. For users who prefer direct on-chain participation, MetaMask, WalletConnect, or Coinbase Wallet is supported.

Question 4

How does the Mobile Money bridge work?

Accepted Answer

The oracle bridge connects Mobile Money accounts to Polygon smart contracts. A user dials *126# (MTN) or uses the Orange Money app to send local currency to a Njangi House MOMO number. The oracle detects the payment via webhook within 30 seconds, converts the amount to USDC at a live FX rate (locked for 30 minutes) via Yellow Card API, and credits the on-chain house. Payouts can be sent back to a MOMO number in the same currency.

Question 5

What is the $NKAP token and what is it used for?

Accepted Answer

$NKAP is the utility and governance token of the Njangi House ecosystem. Total supply is 100 million. Utilities include: fee reduction (holding 0–999 NKAP = 0.5% fee, 1K–9.9K = 0.3%, 10K+ = 0.1%), governance voting on protocol changes and grant allocations, 100 NKAP reward per on-time contribution, 500 NKAP referral bonus, and a quarterly burn mechanism where 20% of platform fees are destroyed to reduce supply.

Question 6

Is Njangi House currently live on mainnet?

Accepted Answer

Njangi House is currently live on the Polygon Amoy testnet, allowing users to create houses, invite members, and simulate the full contribution cycle with test funds. The mainnet launch is targeted after a formal smart contract audit. The platform fee is 0% during the testnet period. Subscribe to updates on the blog or join the Discord for mainnet launch announcements.

Question 7

How are smart contract funds protected?

Accepted Answer

Njangi House smart contracts use OpenZeppelin ReentrancyGuard on all state-changing functions, ECDSA signature verification to authenticate off-chain oracle messages, nonce-based anti-replay protection to prevent transaction duplication, and pull-based payout patterns to avoid reentrancy vectors. All contracts are open-source, deployed on Polygonscan, and will undergo a formal audit before mainnet deployment.

NKAP / USDC

Token List