Impermanent loss

Hold vs pool: two different bets

When you deposit into an AMM liquidity pool, you supply two assets (for example ETH and USDC). The pool enforces a pricing curve—classically x·y=k—so reserves rebalance as traders swap. If one asset moons relative to the other, your inventory ends up heavier in the lagging asset versus simply **holding** the same starting amounts. That divergence is impermanent loss (IL)—“impermanent” until you withdraw and crystallize the difference.

Trading fees paid to LPs can offset IL when volume is high and price moves are modest. Marketing APY often counts fees without showing IL under realistic volatility—especially on correlated pairs vs exotic alts.

Mechanics primer: Explaining Liquidity Pools and Automated Market Makers. Practical entry: How to Provide Liquidity to an AMM Pool.

Numeric intuition without hype

If ETH doubles in price vs USDC while you LP ETH/USDC in a constant-product pool, your ETH share shrinks as arbitrageurs buy cheap ETH from the pool. You participated in upside, but less than hold. If ETH reverts to the entry price, IL “disappears” before fees—you are back near hold plus accumulated fees.

One-way trends hurt LP inventory the most. Stable-stable pools lower IL but carry peg/smart-contract risk—How Stablecoins Maintain Their Peg.

Concentrated liquidity designs (Uniswap v3-style) amplify fee capture **and** IL if price exits your range—you can end up 100% in one token sitting idle.

MEV, gas, and reward tokens

Entering and exiting pools costs gas; small LPs lose to fixed costs. MEV and toxic flow can extract value from passive pools during volatility. Some farms emit reward tokens that temporarily mask IL—when emissions drop, reality appears.

Calculate **net**: fees + rewards + IL + gas. If you cannot estimate IL for a 2× move in either asset, you are not ready to size the position.

Revoke token approvals when exiting—How to Revoke Token Approvals.

When LP still makes sense

High-volume pairs you want to hold long-term anyway, stable pairs you understand, or professional market-making with hedges off-chain. Not “100% APY” screenshots on thin pairs.

Micro-earners routing faucet proceeds should usually **swap or hold**, not LP exotic alts—fee income rarely beats IL on random offerwall tokens.

Bottom line: IL is inventory drift, not a bug. Fees may pay you to provide liquidity, but they do not delete directional risk—model both before you deposit.

A pre-deposit checklist for GetFreeBit operators

Before you deposit, write the pair, fee tier, expected hold horizon, and the IL you would accept if one asset doubles while the other is flat. If you cannot state that number, you are guessing. Cross-check current volume and fee APR from the pool UI—not a farm aggregator screenshot that mixes emissions with trading fees. Emissions can vanish overnight; IL does not wait for your exit.

Prefer pools where you already want both assets for non-LP reasons (for example ETH you hold long-term plus a stablecoin buffer). That framing turns residual inventory drift into a cost of earning fees on holdings you keep anyway—not a leveraged bet on a random alt. Micro-earners sweeping faucet coins should usually swap to a destination asset, not LP thin pairs that look high-APY because nobody trades them.

Operational hygiene: use a dedicated hot wallet, verify the pool contract from official docs, and reject unlimited approvals when a finite allowance works. After exit, revoke leftover allowances and record entry/exit prices for tax lots. Gas to enter, rebalance, and exit belongs in the ROI line—small LPs often lose to fixed costs before IL even matters.

If price leaves a concentrated range, treat the position as idle inventory plus opportunity cost—not “set and forget yield.” Either widen/re-enter with eyes open or withdraw. Passive LP without monitoring is how fee income quietly turns into a worse bag than holding.