Gas, Slippage, TVL — What Do These Words Actually Mean? A Quick Jargon Explainer
The first time you open any crypto group or any DeFi app, you get the “every sentence is in English but I followed none of it” feeling. Gas, Slippage, TVL, APR, APY, IL, LP — they appear in every sentence as if everyone assumed you knew.
This article picks the most common terms and explains them grouped by where you will meet them. For a fuller dictionary, see the crypto glossary; this article only covers the high-frequency words.
Group one: any on-chain action
Gas. Every transaction on a chain requires a fee paid to whichever miner or validator includes it. Not flat — it scales with the “amount of computation” your transaction consumes. See what is a gas fee.
Gwei. The unit gas is denominated in. 1 ETH = 10^9 Gwei. Higher numbers mean miners prioritize your transaction.
Slippage. On a DEX, the time between confirmation and on-chain execution may allow the price to move. Slippage is the maximum acceptable deviation. 0.5%–1% is common.
MEV / sandwich. Bots watch the pending transaction pool, front-run your large swap with their own buy, then sell into your fill. Mitigations: private RPC, smaller swap sizes.
Approve. Granting a smart contract the right to move one of your tokens. Neutral in itself, but the main vector for phishing. See approval phishing.
Group two: data in a DeFi app
TVL (Total Value Locked). Total dollar value of assets users have deposited. Often used as a proxy for usage. Easy to inflate (same money looped), so do not rely on it alone.
APR vs. APY. Both are annual rates with different math. APR is simple interest; APY assumes you reinvest. For the same yield, APY is slightly higher.
| Name | Meaning | Used for |
|---|---|---|
| APR | Annual simple interest | Lending, fixed yield |
| APY | Annual compound interest | DeFi yield, liquidity mining |
LP (Liquidity Provider). You deposit two tokens at a ratio into a DEX pool so others can swap. In return you take a share of the fees.
IL (Impermanent Loss). As an LP, if the two tokens’ price ratio changes, the final value you withdraw is less than just holding them separately. “Impermanent” because if the ratio returns, the loss disappears — in practice, it usually does not. See what is a liquidity pool.
Group three: markets and tokens
ATH / ATL. All-Time High / Low.
FDV (Fully Diluted Valuation). What the project would be worth if every token (including those not yet unlocked) was in circulation today.
Circulating market cap vs. FDV. Newer projects often have a 10x gap. “Market cap $100M, FDV $3B” means roughly $2.9B of tokens will gradually unlock — significant price pressure.
Rug pull. The team suddenly pulls liquidity, dumps their share, and disappears.
FOMO / FUD. FOMO — afraid of being late. FUD — pushed negative narrative. Both describe market emotion at extremes, often manufactured.
Group four: custody
Hot / cold wallet. Hot = key on an internet-connected device. Cold = key on an offline device.
Seed phrase / mnemonic. Usually 12 or 24 English words, the human-readable backup of your private key. Possessing it means controlling everything in that wallet.
Custodial / non-custodial. Custodial = someone else holds your key. Non-custodial = you hold the key. The line between “your coins are yours” and “your coins are an IOU.”
Bridge. A tool that moves assets between chains. Sounds plain, but bridges have been the most exploited piece of crypto infrastructure in recent years.
Group five: trading
Long / Short. Long = bet on up. Short = bet on down.
Leverage. 10x means $1 of margin controls $10 — 10% up doubles your money, 10% down wipes you out. See crypto leverage real risks.
Liquidation. When a leveraged position no longer has enough margin, the platform forcibly closes it.
Stop loss. A pre-set “sell automatically if price hits X” order.
DCA (Dollar-Cost Averaging). Buying a fixed amount on a fixed schedule without predicting price.
Easy-to-miss details
ETH / WETH. ETH is Ethereum’s native coin; many DeFi protocols wrap it into WETH for a uniform ERC-20 interface. 1:1 equivalent.
USDC / USDT. The two most-used dollar stablecoins, different issuers. Both quote at $1, but reserves and regulatory status differ.
Gas Limit vs. Gas Price. Gas Limit is the max compute allowed; Gas Price is the per-unit fee.
Nonce. Each address has an incrementing transaction counter. Prevents replay attacks and enforces order.
Slashing. On proof-of-stake chains, validators who misbehave get part of their stake forfeited. Mostly relevant when staking.
How to actually remember these
Memorizing alone is pointless. These words gain real meaning only after you have used the corresponding tool. Reading “what is LP” ten times is less useful than putting a real $5 into a pool and watching impermanent loss happen.
A workable rhythm: look up any word you do not recognize on the spot; run minimum-stakes experiments; build a personal terminology card deck grouped by scenario.
Crypto vocabulary has a property: about 80% of usage maps to roughly 30 high-frequency words, and every so often a few new concepts appear. Once basics are stable, ten minutes with the source docs is enough to absorb a new term. You will discover that “jargon” is neither mysterious nor deep — it is just shorthand a community uses for efficiency.
Informational only, not investment advice. Protocol parameters and operational details should be checked against official documentation.
This article is for education only and is not financial advice. Crypto is volatile and risky — only ever risk what you can afford to lose.