Market order
A market order is an instruction to trade immediately at the best price currently available. It almost always fills, but you do not control the price, so in thin or fast markets you can pay noticeably more than the price you saw.
Speed over price
The SEC's Investor.gov explains that a market order guarantees execution but not the execution price. You are asking for the next available fill, whatever it is. In deep markets that is usually close to the displayed price. In thin ones it may not be.
Why crypto fills can surprise you
Binance Academy notes that wider spreads raise the cost of entering and exiting a position and are often linked to higher slippage on larger orders. Low-volume markets tend to have wider spreads because there are fewer participants and larger gaps between orders.
Swap buttons on decentralized venues behave like market orders: you sign a swap and it executes against the pool at whatever price the pool offers when your transaction lands. A slippage setting is the only cap on how far that price can move before the transaction fails.
Practical habits
Before a market order, look at the spread, the pool or book depth, and the size of your trade relative to it. Split large orders if the price impact is meaningful. If you need a price ceiling, use a limit order instead and accept that it may not fill. Nothing here is a recommendation to trade any asset.
Common mistakes
The most common mistake is sizing a market order to the money you have rather than to the liquidity available. A buy that is large relative to the pool will walk the price up as it fills, and you pay each higher level. Checking the quoted price impact before you confirm shows how far your own order moves the price.
Another is using a very wide slippage cap as a way to guarantee the fill. The cap is a ceiling on how bad the price can get, so setting it very high means you accept a very bad price. Choose a number you would be willing to live with.
Where this shows up
- Jupiter — Solana traders who want aggregated routing across DEXes with low or zero fees on major and stable pairs.
- Uniswap — Traders and liquidity providers who want direct access to Uniswap pools across many EVM chains without an interface fee.
- Raydium — Solana traders and LPs who want direct access to Raydium pools, and token creators launching through LaunchLab.
- Phantom — Solana-first users who want one self-custodial app for swaps, cross-chain swaps, Hyperliquid perps and predictions.
- Axiom — Desktop Solana and BNB Chain memecoin traders who want spot, Hyperliquid perps and wallet tracking in one web terminal.
- Trojan — Solana memecoin traders outside the US and EU who want one account across a Telegram bot and a web terminal.
Sources
Last checked . Fees and terms change often; the venue's own page wins if it disagrees with ours.
- Types of Orders (Investor.gov, SEC) — checked 2026-10-17
- Bid-ask spread (Binance Academy) — checked 2026-10-17