How does Islamic finance work on the blockchain?

Islamic finance on the blockchain replaces traditional financial intermediaries (banks, brokers) with smart contracts that enforce Sharia principles in code. For Murabaha specifically: (1) The seller deposits a real asset, (2) a buyer provides collateral and agrees to a fixed total price, (3) the smart contract immediately transfers the asset to the buyer, and (4) the buyer repays in scheduled stablecoin installments. No interest, no uncertainty (gharar), and surplus collateral always returns to the buyer.

Is DeFi halal? Can decentralized finance be Sharia-compliant?

Standard DeFi (lending protocols, liquidity pools with APY) is generally not Sharia-compliant because it involves interest (riba) and sometimes excessive uncertainty (gharar). However, Islamic DeFi - built specifically to implement contracts like Murabaha, Ijarah, or Musharakah on-chain - can be halal. Qist implements Murabaha: the buyer receives a real asset at a fixed, pre-agreed price paid in installments, with no interest, no compounding penalties, and a grace period before any liquidation.

What blockchain does Qist's Murabaha smart contract run on?

Qist runs on Base Mainnet (Chain ID 8453), an Ethereum Layer-2 blockchain by Coinbase. Base offers low transaction fees and high throughput, making small installment payments economically viable. The contract address is 0xb2275E4aA2724D875a1a00206b40dD0fF188DEd5 - verified and open-source on BaseScan.

What Sharia principles are enforced in Qist's smart contract?

Qist's smart contract enforces five core Sharia principles: (1) Real ownership - the seller must hold the asset before selling it (no short-selling). (2) Known price - the total cost and profit margin are fixed at contract creation; no hidden fees. (3) Riba-free - profit is calculated proportionally to the installment term, not as compound interest. (4) No penalty interest - late payments trigger only a grace period, not additional charges. (5) Fair collateral - any surplus collateral after liquidation is returned to the buyer, as taking it would be unjust (haram).

What assets can be purchased via Qist's Murabaha contract?

Currently ETH (Ether) and cbBTC (Coinbase Wrapped Bitcoin on Base). Installment payments are made in USDC stablecoin to avoid price uncertainty (gharar). The smart contract proxy address is permanent: 0xb2275E4aA2724D875a1a00206b40dD0fF188DEd5.

How is Qist different from other DeFi lending protocols?

Standard DeFi lending (Aave, Compound, MakerDAO) charges variable interest rates - riba. Qist is not a lending protocol; it is a sale protocol. The buyer receives the asset (ETH/BTC) immediately and owns it outright, while repaying a fixed, pre-agreed total price in installments. There is no interest rate, no APY, no liquidation threshold based on price decline (only on payment default). This structure mirrors traditional Islamic banking's Murabaha home finance, but on a permissionless blockchain.

⛓️ On-Chain Islamic Finance · Base Blockchain

The first Murabaha Smart Contract
on Blockchain

Qist implements the Islamic Murabaha installment sale entirely on the Base blockchain. Buy ETH or BTC at a fixed, halal markup - paid monthly in USDC. No bank. No riba. No intermediary.

Start Buying in Installments Islamic DeFi Explained

Smart Contract (permanent proxy)

0xb2275E4aA2724D875a1a00206b40dD0fF188DEd5

Base Mainnet · Chain ID 8453 View on BaseScan ↗

Concept

What is a Murabaha Smart Contract?

Murabaha (Arabic: مرابحة) is an Islamic finance contract in which a seller discloses the cost of an asset and adds a transparent, pre-agreed profit margin. The buyer repays the total in installments - no interest, no compounding, no riba.

Qist moves this centuries-old contract onto the blockchain. Instead of a bank or Islamic finance institution as intermediary, a UUPS upgradeable smart contract on Base handles every step: asset custody, instant delivery to the buyer, payment scheduling, and collateral management. Everything is immutable, auditable, and permissionless.

// Simplified Qist Murabaha contract logic
function buyOffer(uint256 offerId, uint256 quantity, uint256 installments) external {
    Offer storage offer = offers[offerId];

    // Seller must own the asset - no short-selling (Islamic requirement)
    require(offer.assetAmount >= quantity, "seller must hold asset");

    // Fixed total price known upfront - no variable interest
    uint256 totalPrice = computeTotalPrice(offer, quantity, installments);

    // Transfer asset to buyer immediately - real possession (qabd)
    _transferAsset(offer.asset, msg.sender, quantity);

    // Lock USDC collateral (110-200%) - surplus always returns to buyer
    _lockCollateral(msg.sender, totalPrice * collateralRatio / 10000);
}
      

Sharia Compliance

Five Sharia Principles Enforced in Code

These are not policies - they are hard-coded constraints the contract cannot violate:

Real Ownership (Milkiyyah)

The seller's asset balance is checked on-chain. No selling what you don't own.

Known Price (No Gharar)

Total price and all installments are fixed at contract creation. Zero hidden fees or variable rates.

Instant Delivery (Qabd)

ETH or BTC transfers to the buyer's wallet in the same transaction as the contract signing.

No Penalty Interest (Rifq)

Late payments trigger a 3-day grace period - never additional interest or compounding charges.

Fair Collateral (Adl)

Any collateral surplus after liquidation is always returned to the buyer. Taking the excess is prohibited.

Comparison

Qist vs. Standard DeFi Lending

Standard DeFi Lending
(Aave, Compound)

Variable interest rate (APY) = riba
Loan in cash - no asset sale
Liquidation based on price drop
Compounding penalties on late payment
Not Sharia-compliant

Qist Murabaha Smart Contract

Fixed profit margin - agreed upfront
Asset sale - buyer receives ETH/BTC
Liquidation only on payment default
Grace period before any liquidation
Sharia-compliant (Murabaha)

Technical Architecture

How the Smart Contract Works

Network: Base Blockchain (Ethereum L2)

Base is an Ethereum Layer-2 by Coinbase, offering gas fees under $0.01 per transaction. Low fees make monthly USDC installments economically viable - a critical requirement for micro-finance use cases that would be cost-prohibitive on Ethereum mainnet.

Contract Architecture: UUPS Proxy

The contract uses a UUPS (Universal Upgradeable Proxy Standard) pattern from OpenZeppelin. The proxy address 0xb2275E4aA2724D875a1a00206b40dD0fF188DEd5 is permanent - users always interact with the same address. The implementation can be upgraded by the owner (a 2-of-3 Safe multisig) to fix bugs or add features, without disrupting active positions.

Price Oracles: Chainlink

Collateral ratios and liquidation thresholds are computed using Chainlink price feeds for ETH/USD and BTC/USD. This ensures collateral assessment is based on tamper-proof, decentralized market prices.

Payment Token: USDC Stablecoin

Installments are denominated in USDC, not ETH, to eliminate price uncertainty (gharar) in the payment amount - a core Sharia requirement that the repayment value be known at contract inception.

Automation: Chainlink Automation

Sellers can optionally enable automatic installment collection and auto-liquidation via Chainlink Automation, removing the need for manual intervention while keeping every action transparent and on-chain.

FAQ

Frequently Asked Questions

What is a Murabaha smart contract?

A Murabaha smart contract is an on-chain implementation of the Islamic cost-plus financing contract. A seller deposits a real asset (ETH/BTC), a buyer agrees to a fixed total price paid in USDC installments, and the smart contract handles custody, delivery, payment scheduling, and collateral - replacing the role of an Islamic bank with transparent, open-source code on the Base blockchain.

How is Qist different from conventional DeFi lending?

DeFi lending (Aave, Compound) gives you a cash loan with an interest rate (riba). Qist is a sale protocol: you buy a real asset at a pre-agreed fixed markup. No interest rate, no APY, no compounding. The buyer receives ETH/BTC immediately upon contract signing - not cash. This structural difference is why Murabaha is halal and conventional DeFi lending is not.

Is Qist's contract audited and open source?

The contract is deployed and verified on BaseScan at 0xb2275E4aA2724D875a1a00206b40dD0fF188DEd5. The source code is open-source on GitHub. A formal security audit is planned before the public launch. The contract uses audited OpenZeppelin libraries (UUPS proxy, ReentrancyGuard, SafeERC20).

Who controls the Qist smart contract?

Governance is a 2-of-3 Safe multisig wallet at 0x64D738021BAe4cb9a7fd82529C2F94f61d404064. Any upgrade to the implementation contract or change to protocol parameters requires 2 of 3 key holders to sign. This prevents single-key compromise from affecting user funds.

Can Qist be used without a bank account or KYC?

Yes. Qist is a fully permissionless DeFi protocol. Any wallet on Base can interact with the smart contract - no KYC, no account creation, no approval required. You need ETH for gas (~$0.01/tx) and USDC for installments. This makes Sharia-compliant financing accessible to the 1.8 billion Muslims globally, including those without access to Islamic banking.

Learn More

Islamic DeFi Explained

Complete guide to halal DeFi, what makes it different, and why it matters

Buy BTC/ETH in Installments

Step-by-step guide to buying crypto in halal installments on Qist

كيف تعمل المرابحة؟

Arabic: detailed explanation of how the Murabaha contract works

الاستثمار الحلال

Arabic: complete guide to halal investing in crypto

التمويل اللامركزي الإسلامي

Arabic: Islamic DeFi concept and Qist platform overview

Qist Platform