Liquidity Pools in DeFi: How They Work and What Can Go Wrong
Originally published 5 March 2023; substantially updated 8 November 2026. The earlier Binance-specific walkthrough, crypto-referral promotion and income claim have been removed. This is an educational explanation, not a recommendation to deposit assets or financial advice.
A liquidity pool is a set of digital assets made available to a decentralized trading protocol. Instead of matching every buyer with a seller through a conventional order book, some decentralized exchanges use an automated market maker (AMM) and pool reserves to execute swaps. The basic mechanism is useful to understand even if you never provide liquidity yourself.
How does a liquidity pool work?
In a common two-token pool, people called liquidity providers deposit a pair of assets into a smart contract. Traders swap against those reserves. The pool’s formula and current balances determine the swap price, while trades and other participants change the mix of assets over time. A provider holds a position representing a share of the pool and may receive a portion of trading fees under that protocol’s rules. The exact accounting varies: a position may be represented by pool tokens, an NFT, or another mechanism.
These are DeFi protocol mechanics, not a universal feature of a centralized exchange account. Uniswap’s developer documentation explains the pool and share model for one specific protocol version; newer versions and other protocols can work differently. Never assume a tutorial for one interface or year is still applicable.
Why are fees not guaranteed earnings?
Fees depend on the protocol, trading activity, your share or active price range, and the time your position is in the pool. You may also pay network fees to enter, adjust and exit. A quoted annualized rate can change rapidly and is not a promise of a future return. Compare the value of your position after all costs with the value of simply holding the assets; looking only at fees can hide a poor outcome.
One important comparison is impermanent loss, also called divergence loss: when the relative prices of the assets change, an AMM can leave a provider with a different mix than if they had held the assets outside the pool. The loss is measured against that hold-only comparison, and fees may or may not offset it. Binance’s updated explanation notes that a reversal of price divergence is not guaranteed. The term “impermanent” should not be read as “harmless.”
Other risks to understand
- Smart-contract and operational risk: code bugs, compromised keys or permissions, and failures in interfaces or connected services can cause losses. An audit is useful evidence but not a guarantee.
- Token and market risk: either asset can fall in value; a stablecoin can lose its peg, and a thin market can make exits difficult or expensive.
- Protocol design risk: fee tiers, reward tokens, concentrated price ranges and withdrawal rules differ. A position may stop earning fees when its price range is inactive.
- Network costs and taxes: transaction fees and local reporting obligations can materially affect the result. Rules vary by jurisdiction.
Uniswap’s documentation on returns illustrates why fees and changes in the underlying assets must be considered together. That example is educational, not a forecast for another pool or protocol.
What changed since the original Binance article?
The 2023 version presented a fixed route through “Binance DEX” as if it were a current, general way to access liquidity pools. That conflated different products. Binance announced the end of its named Liquidity Mining service in January 2024. This does not mean all DeFi liquidity pools ceased to exist; it means the old product instructions should not be followed as a live checklist. The old embedded video is dated and its spoken instructions have not been checked against current products, so it is not presented here as current instruction.
A cautious research checklist
- Identify the exact protocol, network, pool and contract from official documentation. Similar names and copied websites are not proof of authenticity.
- Read how that specific position handles deposits, fees, rewards, withdrawals and approvals. Check whether the product is available where you live.
- Compare several scenarios, including both tokens falling, one token moving sharply, fees dropping and network costs rising. Consider the hold-only alternative.
- Understand what you would need to do to exit, revoke permissions and keep records. If you cannot explain the mechanics and downside, do not treat a displayed yield as an answer.
A liquidity pool is trading infrastructure, not a home business, a savings account or a guaranteed income stream. The question to ask is not “How much can I earn?” but “What exactly could change the value of this position, and what evidence do I have for each assumption?”
