Composability

What is Composability?

Composability is the ability of different smart contracts and protocols to interact with one another. It allows developers to use existing applications as "building blocks" to create more complex systems.

How does Composability work?

1. Smart contracts are deployed with public, standardized interfaces (e.g., ERC-20).
2. One contract can call the functions of another contract in a single transaction.
3. For example, a yield aggregator can automatically move funds between different lending protocols.
4. This "interlocking" of code happens permissionlessly, without needing a formal partnership.
5. The result is a highly integrated ecosystem often referred to as "Money LEGOs."

Why does Composability matter?

Composability accelerates innovation by allowing developers to build on top of existing liquidity and infrastructure instead of starting from scratch. It leads to a richer and more efficient financial ecosystem where services are deeply interconnected.

Key features of Composability

• Modular design
• Permissionless integration
• High speed of development
• Standards-based (e.g., ERC-721, ERC-20)
• Shared liquidity across protocols

Examples of Composability

• Using a "flash loan" from Aave to trade on Uniswap and repay the loan in one block.
• An NFT that can be used as collateral for a loan in a DeFi protocol.
• Yearn Finance automatically routing deposits to the highest-yielding lending market.