// GLOSSARY -- DEFI

What is Composability?

1 min read Updated

Composability is the ability of DeFi protocols to interact with and build on each other like Lego blocks — enabling complex financial products from combinations of simple, interoperable components.

WHY IT MATTERS

Composability is DeFi's superpower. Because protocols share the same blockchain state and standard interfaces (ERC-20, etc.), they can be combined freely. Deposit ETH in Lido → get stETH → deposit in Aave as collateral → borrow USDC → provide liquidity on Curve → stake LP tokens for CRV rewards. Each step builds on the previous one.

This enables permissionless innovation. New protocols can integrate existing ones without permission or partnership agreements. A startup can build on Uniswap's liquidity and Aave's lending from day one.

The risk: composability creates interdependencies. A bug in one protocol can cascade through connected protocols. The 2022 stETH depeg affected every protocol using stETH as collateral.

FREQUENTLY ASKED QUESTIONS

Why is composability called 'money Legos'?
Like Lego blocks, DeFi protocols snap together through standard interfaces. Each protocol is a building block; combining them creates structures more complex than any individual piece.
What enables composability?
Shared blockchain state, standard interfaces (ERC-20), open-source code, and permissionless access. Anyone can call any public contract function without approval.
What are the risks of composability?
Cascading failures across connected protocols, increased attack surface (exploit one protocol to drain another), and hidden dependencies that aren't obvious until something breaks.

FURTHER READING

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