HCS Score
Red Line Violations
Research Opinion, Not a Fatwa
These are absolute prohibitions in Islamic finance. If any red line is triggered, the asset is automatically classified as HARAM.
Ecosystem Riba Exposure
Not directly or indirectly connected to interest generating mechanisms
Gambling / Betting
No gambling or betting mechanism
Haram Industry
Not involved in haram industry
Based on Red Line Screening and HCS Scoring.
Haram / Non Compliant
This cryptocurrency is evaluated as Haram for investment and use because the asset demonstrates material Sharia compliance concerns within the CoinStudy HCS framework.
Explanation
This asset shows significant concerns related to Sharia compliance, financial structure, or speculative design.
Reviewed by
CoinStudy Shariah Board
The DeFi space has spent years trying to solve a fundamental inefficiency: capital sitting in lending pools earns nothing while the same capital could simultaneously be powering a decentralized exchange. Fluid, formerly known as Instadapp, solved this problem in 2024 by introducing a unified liquidity layer where the same deposited capital simultaneously earns lending interest and DEX trading fees. The result is one of the most capital-efficient protocols in DeFi. By Q1 2026, Fluid had crossed $4 billion in total value locked and become the second-largest lending protocol on Ethereum behind only Aave according to Dextools’ 2026 research.
For Muslim investors, that capital efficiency innovation contains the core compliance problem. When lenders in Fluid deposit USDC or ETH and earn yield from interest paid by borrowers, they are participating in an interest-based lending relationship that CoinStudy’s HCS framework identifies as a Riba structure. This is not a peripheral feature of the protocol. It is the foundational economic design of Fluid’s Liquidity Layer and the primary mechanism that drives all yield earned by depositors.
FLUID fails two Layer 1 red-line checks independently. The Fluid protocol’s core architecture is an interest-bearing lending market where borrowers pay interest and depositors receive it as yield through the Liquidity Layer. This is established in Fluid’s own documentation and independent technical research. The two independent failures are sufficient for an automatic Haram classification under HCS. No HCS score is assigned because Layer 1 failure produces an automatic Haram classification.
Fluid (formerly Instadapp) is a unified DeFi liquidity layer built on Ethereum by founders Samyak Jain, CEO, who won the Ethereum Hackathon and began building Instadapp from 2018, and Sowmay Jain. The INST token migrated to FLUID with the same total supply of 100 million tokens and the same token address per the Fluid governance rebrand proposal.
Fluid’s architecture centers on a Liquidity Layer, a core smart contract pool that holds deposited funds and connects three protocol modules built on top of it: the Lending Protocol, the Vault Protocol, and the DEX Protocol. The Liquidity Layer is the economic engine: funds flow in from depositors, flow out to borrowers, and the interest differential is distributed back to depositors according to their fToken share of the pool.
The Lending Protocol is Fluid’s basic deposit-and-earn product. Users supply assets including USDC, USDT, ETH, and wstETH. Borrowers pay interest to borrow against collateral. That interest flows back to the Liquidity Layer and distributes to depositors proportional to their share per Eco.com’s technical documentation of the protocol.
The Vault Protocol extends this with Smart Collateral and Smart Debt mechanisms. Smart Collateral allows collateral to simultaneously function as LP liquidity in the Fluid DEX while backing a borrow position. Smart Debt allows borrowed assets to simultaneously function as LP liquidity. In some configurations, the Vault Protocol enables recursive leverage: depositing wstETH and looping borrow-and-redeposit through Fluid Lending to produce 4x exposure to ETH staking yield, with net APY calculated as staking yield multiplied by four minus borrow rate multiplied by three per Eco.com’s April 2026 protocol documentation. These mechanisms amplify the depth of exposure to the Liquidity Layer’s interest-bearing relationships.
The DEX Protocol integrates with the same Liquidity Layer. Fluid became the second-largest DEX on Ethereum by volume in 2025, facilitating over 50% of Ethereum volumes for specific correlated asset pairs per the Fluid Q4 2025 update document. Daily DEX volume above $400 million was documented in Q1 2026 per Dextools research.
The FLUID token is the governance token of the Fluid DAO. According to Fluid’s MiCA whitepaper filed November 2025, FLUID holders vote on protocol upgrades, risk parameters, fee settings, treasury spending, and revenue allocation. Fluid’s Blockworks token transparency filing confirms that FLUID token holders currently have no direct value accrual mechanism: no direct revenue share, no interest income distributed to token holders, and no staking mechanism for additional economic rights as of the filing date.
According to CoinMarketCap research as of October 16, 2026, FLUID trades at approximately $2.30 with a market capitalization of approximately $193 million, a rank of approximately number 142, a circulating supply of approximately 83.7 million FLUID, a total supply of 100 million FLUID, and an FDV of approximately $231 million. These figures are time-sensitive.
The Riba analysis for Fluid requires precision about the participation route, the mechanism, and why it constitutes a Riba structure rather than a permissible fee-for-service arrangement.
CoinStudy’s framework defines a Riba-triggering mechanism as one where a lender holds a protocol-defined and programmatically enforceable entitlement to excess over principal, paid by a borrower who returns more than they received. The question is whether Fluid’s lending mechanism satisfies this definition, and the answer based on available documentation is yes.
When a user deposits USDC into Fluid’s Lending Protocol, they receive an ERC4626 fToken (fUSDC) representing their claim on the pool. Borrowers access USDC from this pool and are charged an interest rate that varies with utilization. Per Dextools’ 2026 research: “suppliers deposit assets like USDC, USDT, ETH, and wstETH to earn interest, and borrowers pay that interest in exchange for borrowing.” Per Eco.com’s technical documentation: “Interest paid by Fluid Lending borrowers flows back to the Liquidity Layer and gets distributed to depositors proportional to their share.”
This is the classical structure of an interest-based loan: the depositor provides capital, the borrower returns the principal plus an interest differential, and the excess flows back to the lender through the protocol mechanism. It is not analogous to an Ijarah service fee, a Musharaka profit-sharing arrangement, or a fee-for-computational-work model. It is a money-for-money-with-excess arrangement. The entitlement is contractual and programmatically enforced through the fToken mechanism. The interest rate varies with utilization rather than being fixed in advance, but a variable rate does not make the entitlement less contractual. What the HCS red line tests is whether the lender holds a protocol-defined and enforceable entitlement to excess over principal, and the fToken is precisely such an entitlement.
Route A is using Fluid’s DEX to swap tokens without depositing into the protocol. A user who simply executes a token swap pays a swap fee for the exchange service. They do not deposit into the Liquidity Layer, do not receive fTokens, and do not earn interest income from borrowers. This activity does not directly place the user in the position of a lender earning interest. CoinStudy assesses this route as requiring individual scholarly assessment rather than an automatic Haram ruling.
Route B is providing liquidity to the Fluid DEX. Liquidity providers deposit assets into the same Liquidity Layer via fTokens. Per Staking Rewards’ documentation, “lenders in Fluid earn yield from multiple sources, including interest paid by borrowers, fees generated from trading on the Fluid DEX, and revenue generated from other protocols built on top of Fluid.” The Liquidity Layer is a single pool: a depositor who enters it to provide DEX liquidity receives the same blended income stream of interest plus DEX fees as a depositor who enters it to lend. There is no mechanism within the current protocol architecture that permits a depositor to receive only the DEX fee component of the yield and exclude the interest income component. This route carries the same Riba concern as Route C.
Route C is depositing directly into Fluid Lending to earn yield. This is the clearest case. The depositor receives fTokens representing a claim on the Liquidity Layer, earns interest paid by borrowers, and receives DEX fee income alongside it. The Riba concern is fully established.
The core Riba finding therefore applies to Routes B and C, which are the participation routes where the depositor enters the Liquidity Layer and receives its blended yield. Route A requires individual assessment separately.
CoinStudy applies principles relevant to AAOIFI Sharia Standards using the “principles relevant to” framing rather than asserting direct applicability. CoinStudy notes that the Chairman’s review is pending and that the application of specific standards to this mechanism will be confirmed upon receipt of that ruling.
The principles relevant to AAOIFI Sharia Standards on lending and interest establish the baseline for the core Riba analysis: a loan that entitles the lender to a return greater than principal is Riba regardless of the label applied to it or the decentralized mechanism through which it operates. Fluid’s lending mechanism, where depositors receive interest income from borrowers through the Liquidity Layer, falls within this prohibition under CoinStudy’s methodology-based assessment.
The principles relevant to AAOIFI Sharia Standards on partnership and profit-sharing are noted because Fluid’s DEX trading fee income, if completely isolated, would resemble a permissible fee for liquidity provision services. The technical architecture of the unified Liquidity Layer does not permit this isolation at the depositor level under the current protocol design. Both income streams are distributed through the same fToken mechanism to the same depositors from the same pool. CoinStudy acknowledges this is a technical architecture fact rather than a documented scholarly ruling, and the Chairman’s review will address how these standards apply.
The principles relevant to AAOIFI Sharia Standards on Ijarah are considered for the DEX trading fee component in isolation. Swap fees represent compensation for genuine liquidity provision services and do not structurally resemble Riba. This is the basis for CoinStudy’s assessment that Route A, pure DEX swapping without depositing, requires individual scholarly assessment rather than automatic Haram classification.
Not scored due to Layer 1 failure. For documentation: Fluid’s core protocol architecture generates income from two streams, namely interest charged on loans through the Lending Protocol, and swap fees on DEX trades through the DEX Protocol. Both streams flow through and out of the same Liquidity Layer to depositors via fTokens. The interest stream is a programmatically enforceable entitlement to excess over principal paid by borrowers. This satisfies CoinStudy’s definition of a Riba-bearing mechanism in the core protocol architecture. The Smart Debt and Smart Collateral mechanisms amplify this exposure through recursive leveraged loops but do not constitute separate Synthetic Interest Products in the HCS sense, since they operate within the existing lending relationship rather than creating a new instrument designed to replicate interest for non-lenders.
Not scored due to Layer 1 failure. For documentation: Fluid has an identifiable founding team, a published Blockworks token transparency filing, a MiCA whitepaper filed November 2025, and a CertiK security score of 4.2 per CoinMarketCap. A March 2026 Resolv incident generated material bad debt at Fluid after a stale oracle allowed sharply depegged collateral to be borrowed against per Staking Rewards research. The compliance issue is structural, not informational.
Not scored due to Layer 1 failure. No wagering mechanism exists in Fluid’s core protocol.
Not scored due to Layer 1 failure. For documentation: Fluid’s underlying business activities are DeFi lending at interest and decentralized exchange. Lending at interest is a prohibited business activity under Islamic commercial law. The DEX activity in isolation would be permissible. The unified Liquidity Layer architecture means these two activities share the same capital pool and the same income distribution mechanism for depositors.
Not scored due to Layer 1 failure. For documentation: Fluid demonstrated genuine and substantial real-world DeFi adoption. By Q1 2026 it crossed $4 billion TVL and became the second-largest lending protocol on Ethereum per Dextools research. It was the second-largest DEX on Ethereum by volume per the Q4 2025 update, with daily DEX volume above $400 million documented in Q1 2026. The compliance issue is not with Fluid’s utility or adoption.
Not scored due to Layer 1 failure. For documentation: total supply is 100 million FLUID with no new minting. The vesting schedule ended in 2025 per Tokenomist research. As of October 16, 2026, approximately 83.7 million FLUID (83.7%) is in circulation per CoinMarketCap. Allocation per Tokenomist: 55% community, 23.79% current team members, 12.09% investors, 7.85% future team and ecosystem partnerships, and 1.27% advisors. These figures should be verified against primary sources before publication.
Not scored due to Layer 1 failure. For documentation: Fluid has publicly identified founders, a Blockworks token transparency filing, a MiCA whitepaper, on-chain DAO governance by FLUID token holders, and a CertiK security score of 4.2. Governance documentation is among the more comprehensive in DeFi.
Because the protocol-level Haram classification and the token-level classification are distinct questions, CoinStudy addresses them separately and presents the token-level reasoning explicitly.
The Fluid protocol’s core architecture is an interest-bearing lending market. That protocol-level finding is established above. The separate question is whether holding FLUID and participating in governance makes a token holder a party to the Haram mechanism, and if so through what reasoning.
CoinStudy’s methodology-based assessment rests on two documented facts. First, FLUID holders vote on the specific parameters of the interest-bearing Lending Protocol: interest rate configurations, asset listings, vault parameters, fee settings, and risk parameters per the MiCA whitepaper and Blockworks filing. This means a FLUID holder who participates in governance votes is actively directing the operational parameters of a Riba-bearing mechanism. Second, governance is not merely symbolic: the DAO controls treasury, IP, and protocol-controlled resources per the Blockworks filing. Governance participation is substantive and consequential.
CoinStudy’s assessment is that voting on the parameters of a Riba-bearing lending protocol constitutes a form of participation in directing that prohibited mechanism, even when the token holder does not directly lend money or receive interest income. This is analogous to a classical principle that assisting in or facilitating a prohibited transaction carries its own prohibition.
However, two important qualifications must be stated. First, FLUID currently has no direct value accrual from protocol lending interest income per the Blockworks filing and MiCA whitepaper. The Haram classification of holding FLUID rests on the governance participation concern, not on financial benefit from Riba income. Second, this is a genuinely contested area in Islamic finance, and the degree to which governance token ownership constitutes prohibited participation may depend on whether the holder actually votes, the nature of what they vote on, and individual scholarly views on corporate governance analogies in an Islamic framework. CoinStudy presents this as a methodology-based assessment explicitly marked for Chairman review rather than as a settled scholarly ruling.
Overall Classification: Haram ❌. No HCS score is assigned.
Scholar Question 1: Does the DEX fee component of Fluid’s Liquidity Layer income redeem FLUID from a Riba classification, given that DEX swap fees are permissible in isolation?
CoinStudy’s response: The DEX trading fee income in isolation is permissible compensation for genuine liquidity provision services and does not structurally resemble Riba. The compliance concern is specific to participation routes B and C where depositors enter the Liquidity Layer via fTokens. When a depositor enters the Liquidity Layer, they receive a blended income stream of interest paid by borrowers plus DEX fees from the same pool. Per Staking Rewards documentation, lenders earn from “interest paid by borrowers, fees generated from trading on the Fluid DEX, and revenue from other protocols built on top of Fluid.” No current mechanism permits a depositor to elect to receive only the DEX fee component. The inseparability is a documented technical architecture fact, not merely a general description. Route A users who simply swap tokens through the DEX without depositing are assessed separately in the activity matrix.
Scholar Question 2: Is the interest entitlement in Fluid’s fToken mechanism truly “contractual” given that the interest rate varies with utilization?
CoinStudy’s response: The HCS red line tests whether a lender holds a protocol-defined and programmatically enforceable entitlement to excess over principal. It does not require the entitlement to be at a fixed rate. The relevant distinction is between a service fee, which is compensation for a defined service regardless of capital deployed, and an interest entitlement, which is a right to share in the excess return generated by lending capital. Fluid’s fToken represents the latter: the depositor’s claim on the pool’s accumulated interest income, regardless of what the utilization-driven rate happens to be at any given time. A variable interest rate is still an interest entitlement. Classical Riba prohibitions apply to the structure of the relationship, not to whether the rate is fixed or floating.
Scholar Question 3: Is holding FLUID as a governance token Haram even when FLUID currently has no direct value accrual from lending interest income?
CoinStudy’s response: CoinStudy’s methodology-based assessment is that voting on the specific operational parameters of a Riba-bearing lending protocol, including interest rate configurations, asset listings, and vault parameters, constitutes a form of directing participation in that prohibited mechanism even without financial benefit from the Riba income directly. The prohibition on Riba extends in classical Islamic jurisprudence to parties who facilitate or assist in Riba transactions, not only to those who personally receive the interest. Governance voting on lending parameters is assessed as a form of facilitation and direction. However, CoinStudy explicitly marks this as a methodology-based assessment rather than a settled scholarly ruling and flags it for Chairman review. The degree of culpability in governance token ownership is a genuinely contested area that may depend on individual voting behavior, the nature of what is voted on, and individual scholarly views.
Scholar Question 4: Could a Muslim investor interact only with Fluid’s DEX to swap tokens without any lending participation, and would that be permissible?
CoinStudy’s response: A user who executes token swaps through Fluid’s DEX without depositing into the Liquidity Layer is not directly placing themselves in the position of a lender earning interest. They pay a swap fee for the exchange service, which is itself permissible. CoinStudy assesses Route A, pure DEX swap use with no deposit, as requiring individual scholarly assessment rather than automatic Haram classification. The residual question for scholarly consideration is whether the fact that the counterparty liquidity is provided by depositors earning interest income creates an indirect prohibited connection for the swap user. CoinStudy does not resolve this question at the protocol classification level. Muslim investors who use Fluid solely as a DEX for token swapping, without depositing into any lending or liquidity provision role, should seek individual scholarly guidance on this specific residual question.
Scholar Question 5: How does Fluid’s interest income differ structurally from ETH staking yield, which CoinStudy has assessed separately as permissible?
CoinStudy’s response: The distinction is structural and important. ETH staking yield is earned by validators who provide a genuine and specific service to the Ethereum network, namely block proposal, attestation, and network security. The staked ETH is not lent to another party who returns more than they received: there is no borrower, no loan, and no entitlement to excess over deployed capital. The income is a service reward from the protocol for work performed. In Fluid Lending, depositors lend assets to borrowers who use them and pay back more than they received. This is a direct loan relationship with an enforceable entitlement to excess over principal. The presence of a smart contract intermediary and a variable utilization-based rate does not change the economic substance of the relationship from loan-with-interest to service-fee. The two mechanisms are structurally and economically distinct.
Ecosystem Riba Exposure: ❌ Failed. Fluid’s Liquidity Layer is an interest-bearing lending market in the core protocol architecture. Depositors who enter the Liquidity Layer via fTokens receive interest paid by borrowers as yield, distributed proportionally from the pool. Per Eco.com’s technical documentation, “interest paid by Fluid Lending borrowers flows back to the Liquidity Layer and gets distributed to depositors proportional to their share.” This is a protocol-defined and programmatically enforceable entitlement to excess over principal. The lending mechanism is the primary economic product of the protocol, not a peripheral third-party activity.
Gambling and Betting: ✅ Passed. No wagering mechanism in the core protocol.
Haram Industry: ✅ Passed. DeFi infrastructure is not an inherently prohibited industry.
Guaranteed / Contractual Interest Return: ❌ Failed. The fToken mechanism represents a protocol-defined, programmatically enforceable entitlement to interest income generated by borrowers paying back more than they received. The interest rate varies with utilization rather than being fixed in advance, but a variable rate does not make the entitlement less contractual. The HCS red line tests for a protocol-defined and enforceable entitlement to excess over principal, which the fToken represents regardless of the rate’s variability.
Synthetic Interest Products: ✅ Passed. The Smart Debt and Smart Collateral vault mechanisms run recursive leverage through the existing Fluid Lending protocol and amplify the depth of Riba exposure documented above. They do not constitute separate synthetic interest products in the HCS sense, which covers instruments specifically designed to replicate interest income for parties who would otherwise not access a lending relationship. Smart Debt operates within an existing lending relationship rather than creating a new synthetic instrument. The Riba concern from these mechanisms is fully captured within the two red lines that have already failed.
Two red lines fail independently. Either alone produces automatic Haram classification.
Overall Classification: Haram ❌. No HCS score is assigned.
Requires individual scholarly assessment:
Using Fluid’s DEX to swap tokens without depositing into the Liquidity Layer = Requires individual scholarly assessment ⚠️ a pure swap user pays a fee for an exchange service and does not directly enter the lender position earning interest; the residual question of whether the counterparty liquidity’s interest-bearing origin creates a prohibited connection for the swap user is not resolved at the protocol classification level and requires individual scholarly guidance
FLUID perpetual futures and leveraged derivative products = Requires separate contract-level assessment ⚠️ such products must be assessed based on their specific contractual structure including leverage, funding, and settlement mechanisms; this coin analysis covers the FLUID governance token and Fluid protocol participation only and does not constitute a ruling on derivative products referencing FLUID
Haram based on specific prohibited mechanisms:
Depositing assets into Fluid’s Lending Protocol to earn yield = Haram ❌ depositors receive blended yield including interest paid by borrowers through the Liquidity Layer; this is a direct Riba-bearing participation route
Providing liquidity to the Fluid DEX through the Liquidity Layer = Haram ❌ liquidity providers deposit into the same fToken-based Liquidity Layer that distributes interest plus DEX fees together; no current mechanism permits the depositor to receive only the DEX fee component and exclude the interest income
Using Fluid’s Smart Collateral and Smart Debt vault mechanisms = Haram ❌ these mechanisms run recursive leveraged positions through the interest-bearing Lending Protocol, deepening the Riba-bearing exposure
Holding FLUID as a governance token and participating in governance votes on lending parameters = Haram ❌ under CoinStudy’s methodology-based assessment, voting on the operational parameters of a Riba-bearing lending protocol including interest rate configurations, asset listings, and vault parameters constitutes a form of directing participation in that prohibited mechanism; this assessment is explicitly marked for Chairman review as the question of governance token ownership in relation to prohibited protocols is a contested scholarly area
Do I understand that the Haram classification is based on the interest-bearing lending mechanism being the core protocol architecture of Fluid, and that this covers depositing into the Lending Protocol and providing liquidity through the Liquidity Layer but does not automatically extend to all possible interactions with the Fluid DEX? Do I understand that the DEX fee component of Fluid’s yield is permissible in isolation but that the Liquidity Layer architecture distributes interest and DEX fees together to depositors with no current mechanism to separate them? Do I understand that CoinStudy’s classification of FLUID governance token holding as Haram rests on the governance participation concern rather than on direct financial benefit from interest income, and that this specific question is pending Chairman review? Am I aware that Route A, using Fluid’s DEX solely to swap tokens without depositing, requires individual scholarly assessment rather than automatic Haram classification?
CoinStudy’s Chairman, Dr. Usman Quddus, PhD in Islamic Studies & Finance, has not yet reviewed this specific analysis. This section will be updated with the Chairman’s direct ruling upon completion of the review. CoinStudy’s Haram classification is based on the Riba analysis of Fluid’s Liquidity Layer mechanism in the core protocol architecture. The specific question of FLUID governance token ownership in relation to a Riba-bearing protocol is explicitly flagged for the Chairman’s attention.
Fluid (FLUID) is classified as Haram under the CoinStudy Halal Crypto Standard.
Two Layer 1 red lines fail independently. The first is Ecosystem Riba Exposure: depositors who enter Fluid’s Liquidity Layer via fTokens earn interest paid by borrowers as yield distributed proportionally from the pool. The second is Contractual Interest Entitlement: the fToken represents a protocol-defined, programmatically enforceable entitlement to that interest income, with the variability of the rate not affecting the contractual nature of the entitlement.
The Haram classification applies specifically to the participation routes where a user deposits into the Liquidity Layer: directly via the Lending Protocol, or as a liquidity provider via the DEX, since both routes enter the same fToken pool that distributes blended interest plus DEX fee income with no separation mechanism for depositors. Pure DEX swap use without depositing is assessed as requiring individual scholarly assessment. The FLUID governance token is assessed as Haram under CoinStudy’s methodology, specifically because FLUID holders vote on the operational parameters of the interest-bearing Lending Protocol, with this specific conclusion marked explicitly for Chairman review.
Fluid is technically innovative and has demonstrated genuine DeFi adoption at substantial scale. The compliance issue is with the economic substance of the depositor relationship in the Liquidity Layer, not with the quality of the technology or team.
Read detailed analysis and concepts here:
Understanding Gharar in Crypto
Disclaimer: This analysis is provided for educational and research purposes only based on CoinStudy’s HCS methodology. The Haram classification reflects CoinStudy’s framework-based assessment of Fluid’s documented mechanisms and does not constitute a fatwa or personal scholarly ruling. The classification of FLUID governance token ownership is explicitly marked for Chairman review. The Chairman’s ruling is pending and will update this page when received. CoinStudy does not issue personal fatwas or financial advice. Please consult a qualified Islamic scholar for individual guidance.
Guaranteed Interest
No guaranteed interest obligations
Synthetic Interest Products
No synthetic interest instruments
2 Red Lines Failed
This asset is automatically classified as HARAM.
Is Rain halal?
RAIN · HCS 0 · Haram
