Minimum trade size

Exchanges publish the floor separately from their terms of use, which keeps it changeable without a contract amendment. Bitstamp's Terms of Use for Bitstamp Ltd, last updated May 30, 2025, state no figure, saying only that "the minimum trade size is defined by the Bitstamp Fee Schedule". Anyone buying small amounts should read that schedule before funding an account.

How it works

A minimum trade size lives in a document the exchange can revise on its own, and the contract you accept merely points at it. Bitstamp runs that delegation across six separate entity terms documents. Bitstamp Ltd and Bitstamp Global Ltd each carry a short "Minimum Trade Size" heading inside their trading section; Bitstamp USA Inc repeats it as clause 13.9; Bitstamp UK Limited, the separate UK terms written for the Robinhood channel, and Bitstamp Asia Pte. Ltd. all place it in clause 11 under a different name, the "minimum order size requirement". A seventh set, Bitstamp Europe S.A., carries no such clause at all. Not one of the six states a figure, and their version dates run from May 30, 2025 to August 10, 2026.

The Bitstamp Ltd terms go further and list "Requiring minimum trade sizes" among the events the operator may undertake under the agency authority you grant it, in the same bullet list as suspending or terminating the relationship, "Prohibiting wash trading and other activities" and "Blocking Accounts in certain circumstances". Read that way, the floor is a discretionary control rather than a fixed market parameter, so a number you memorized a year ago may not be the one the order form enforces today.

A rejected small order is not the same thing as a rejected underfunded one. Bitstamp's USA Inc terms handle insufficient balance separately, at clause 13.8: if your wallet cannot cover the order, the exchange may cancel the whole thing or fill only the portion your balance does cover. Its clause 13.9, the size floor, does nothing but name the Fee Schedule. The UK Limited and Asia Pte. Ltd. terms both state the size requirement inside clause 11, the clause that also reserves the right to refuse an order for a breach of the terms, severe market volatility, technical issues or a manifest error in the displayed price.

Where you see it

The minimum trade size surfaces the first time an exchange refuses an order your balance could comfortably pay for. Three moments produce it most often: a first test purchase kept deliberately tiny, a recurring buy set to an amount that once cleared the floor and no longer does, and the tail end of a sell, where the leftover balance is worth less than the smallest order the market will take.

Bitstamp UK Limited states the requirement under a clause 11 heading called "Transaction requirements and order refusal rights", and the same clause then describes Basic Trading, the request-for-quote flow through its simplified user interface where the spread sits inside the execution price, and Recurring Buy and Recurring Sell, whose later transactions are priced at the time of each one rather than at the quote shown when you set them up. Our exchange reviews record each operator's fee structure; the live floor itself always comes from the operator's own fee schedule, which is the document its terms of use hand the question to.

Minimum trade size vs Dust limit

A minimum trade size is an exchange rule, while the dust limit is a bitcoin network relay policy. The first is enforced by an order form before anything reaches the blockchain, and it can change on the day an operator updates a fee schedule. The second is enforced by the nodes that relay transactions, applies to on-chain outputs whoever creates them, and no exchange can waive it. A trade that clears an exchange floor usually never touches the chain at all: it moves balances on the operator's internal ledger, and only a withdrawal turns it into a bitcoin transaction that the dust rules can judge.