Stablecoins have become a core part of the global crypto economy, but not all of them are built the same. Stability, decentralization, and capital efficiency are all important factors, and how they’re prioritized changes from one coin to another. The stablecoin trilemma is a good way to understand how design choices balance these attributes and why no model can maximize all three.

Below, we’ll explore the stablecoin trilemma, the design trade-offs behind each type of stablecoin, and how to use the trilemma to evaluate stablecoins.

What’s in this article?

• What is the stablecoin trilemma?
  
• How do technical choices affect trade-offs?
  
• How does stability affect decentralization?
  
• What risks appear across trilemma dimensions?
  
• How can users evaluate stablecoins using the trilemma?
  
• How Stripe Payments can help
  

What is the stablecoin trilemma?

The stablecoin trilemma is the challenge of designing a stablecoin model that meets three goals: capital efficiency, price stability, and decentralization. Stablecoins can efficiently achieve only two of the three simultaneously.

Stablecoin use is growing globally, with the total value of all stablecoins issued projected to reach $2 trillion by 2028. While stablecoins can be a reliable alternative to more volatile kinds of crypto, each of the different stablecoin types comes with its own risks and benefits. The stablecoin trilemma is a simple way to understand why no stablecoin has managed to be fully stable, fully decentralized, and fully capital-efficient at the same time.

Here’s a closer look at these three attributes:

• Stability: Stability is the purpose of a stablecoin. The cryptocurrency is designed to hold a predictable value, usually tied to a fiat currency such as the US dollar.

• Decentralization: Decentralization is the purpose of cryptocurrency in general. Decentralized protocols mean that no one institution decides how the system runs or who can use it.

• Capital efficiency: Capital efficiency is how much backing a stablecoin needs to function. A capital-efficient design is one-to-one, which means users and issuers need to lock away only collateral that’s equivalent in value to the stablecoins they create.

These traits can’t all exist together, because solving for one of them undermines at least one of the others:

• More stability but less decentralization: If you want nearly perfect price stability, the easiest solution is to keep things centralized and fully backed by cash or highly liquid assets.

• More decentralization but less stability: If you want total decentralization, you often need to rely on crypto collateral and automated market systems, which are harder to keep perfectly stable.

• More capital efficiency but less stability: If you maximize capital efficiency, you’ll have a smaller safety buffer when markets are turbulent.

How do technical choices affect trade-offs?

The design decisions behind a stablecoin also determine which two elements of the trilemma it prioritizes. The more efficient a stablecoin becomes, the smaller cushion it has against volatility; the bigger cushion it builds, the more capital it traps.

Here are the different stablecoin models and how they approach the trilemma.

Fiat-backed designs

Fiat-backed stablecoins are pegged to cash or short-term, highly liquid assets. Backing is held by an issuer and has equivalent value to every token in circulation. This setup can reliably offer strong price stability and capital efficiency. The reserves keep the peg steady, and every dollar of backing produces a dollar of stablecoin.

But this model can’t support decentralization; in fact, it’s centralized by definition. Users depend on the issuer’s banking partners, reporting practices, and regulatory posture, and the issuer’s decisions directly affect the user.

Crypto-collateralized designs

Stablecoins backed by on-chain collateral (including assets on blockchains like Ethereum) prioritize decentralization. The collateral sits in smart contracts, not in a bank account, so anyone can verify it. This removes the need for a single authority, but it introduces volatility.

To manage volatility, these systems use overcollateralization to maintain the peg. This achieves decentralization and stability at the expense of capital efficiency. Producing a dollar of stablecoin requires locking up more than a dollar of other assets, which creates an opportunity cost for businesses and investors.

Algorithmic designs

Some stablecoins skip collateral altogether and rely on algorithms to fine-tune supply or on a secondary token to absorb volatility. These designs achieve both decentralization and capital efficiency, but the resulting stablecoins lack stability. When markets are calm, they’re fine. But when confidence falls, they can unwind quickly. Without deep reserves, redemption pressure accelerates instability, and the peg might slip. In 2022, the algorithmic stablecoin TerraUSD failed when depositors lost confidence. That erased nearly half a trillion dollars of value from the crypto markets.

How does stability affect decentralization?

Stablecoins are meant to hold steady when markets move. How they achieve that stability often determines how decentralized they are. The more control a system requires, the harder it is to distribute that control widely.

Here are the trade-offs.

Centralized stablecoins

With centralized stablecoins, a set authority (the issuer) is in control. The issuer has reserves and banking access, and can keep the peg in place by making decisions that mitigate volatility. This setup is stable, but it’s not decentralized: that issuing authority can freeze funds, change rules, or face regulatory requirements that affect all users.

Decentralized stablecoins

In a decentralized stablecoin, no single operator keeps the currency pegged to the dollar. Instead, the token depends on smart contracts, collateral, and incentives. User-contributed collateral is the foundation of the system, and the code enforces rules that encourage the market to keep the token near its target value. In this more open model, stability relies on careful design and healthy market dynamics, and it can’t be enforced through active intervention.

In turbulent markets, decentralized systems often need wider collateral buffers, faster liquidations, or temporary governance adjustments to protect the peg. Those moves can keep the system operating, but they show how difficult it is to maintain both strong decentralization and firm stability at the same time. Some decentralized designs reinforce the peg by including other stablecoins in their collateral mix, a practical choice that also introduces indirect reliance on centralized assets.

What risks appear across trilemma dimensions?

Every stablecoin carries different risks based on which two sides of the trilemma it emphasizes. This makes potential weak points somewhat predictable.

Here’s where to find them:

• Centralization and counterparty exposure: Centralized models depend on their issuers’ operational and banking stability so the issuer deserves scrutiny. If reserves are frozen or access to banking networks is disrupted, users can feel the impact immediately.

• Collateral and market volatility: Crypto-backed systems bring the risks of quickly moving collateral. Sharp price drops can start a liquidation rush that allows the peg to drift.

• Crisis in confidence: Undercollateralized or algorithmic designs depend heavily on trust in the system. When confidence decreases, redemptions accelerate and can overwhelm the system before incentives have any effect.

• Governance and contract vulnerabilities: Decentralized systems rely on smart contracts, price feeds, and collective decision-making. Coding flaws, oracle failures, or slow governance responses can destabilize the system.

• Regulatory shifts: Centralized issuers face compliance requirements that can affect user access, redemption mechanics, or continuity.

How can users evaluate stablecoins using the trilemma?

The trilemma is a helpful framework for understanding what a stablecoin can deliver. Seeing how a stablecoin leans and why shows you its priorities.

Here’s how to evaluate stablecoins using it:

• Identify the design model: Start by determining whether the stablecoin is fiat-backed, crypto-collateralized, algorithmic, or a hybrid model. Each structure naturally leans toward two sides of the trilemma and away from the third.

• Review peg performance: Check how well the stablecoin has held its value, both in normal conditions and in moments of stress. Consistent pricing and deep liquidity are strong indicators of resiliency.

• Gauge decentralization: Clarify who or what is in charge. A fiat-backed coin depends on an issuer, while a decentralized one depends on collateral mechanics, governance, and code.

• Assess efficiency: Identify what backs the stablecoin and at what ratio. Overcollateralized systems offer stability while tying up capital. Efficient systems grow faster but might have thinner buffers.

• Assess governance and transparency: The system or issuer behind the stablecoin needs to earn your trust. With decentralized designs, look for active governance, clear parameter decisions, and well-audited contracts. With centralized designs, prioritize regular reserve disclosures and regulatory clarity.

• Match the stablecoin to your use case: Developers and crypto-native users might value decentralization or programmable collateral more than perfect efficiency. Businesses might prioritize stability and liquidity.

How Stripe Payments can help

Stripe Payments provides a unified, global payment solution that helps any business – from scaling startups to global enterprises – accept payments online, in person, and around the world. Businesses can accept stablecoin payments from almost anywhere in the world that settle as fiat in their Stripe balances.

Stripe Payments can help you:

• Optimise your checkout experience: Create a frictionless customer experience and save thousands of engineering hours with prebuilt payment UIs and access to 125+ payment methods, including stablecoins and crypto.

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Learn more about how Stripe Payments can power your online and in-person payments or get started today.