Why Do Crypto Prices Move? The Machine Behind the Number

The day before the US Securities and Exchange Commission approved the first spot bitcoin ETFs, somebody broke into the regulator's account on X and posted the announcement early. The price jumped, then snapped back, all inside an hour, on news that was not real yet. The real approval came the next afternoon, 10 January 2024: eleven ETFs cleared at once, after a decade of rejections, and ordinary brokerage accounts could suddenly hold bitcoin the way they hold index funds.

Both moves are worth sitting with for a second. The market repriced a rumour in minutes, then repriced the real thing the next day. Crypto prices move because information, access and mood keep hitting a market that never closes and that, on the supply side, often cannot respond at all. This piece walks through those forces as an explainer, not financial advice, and it contains no forecasts.

Start with supply, because supply often cannot move

Most markets balance two flexible sides: if coffee gets expensive, growers plant more coffee. Crypto is unusual in that the supply side is frequently rigid. Bitcoin's schedule was written into its code in 2009: 21 million coins in total, with the flow of new ones cut in half at each halving. The fourth halving happened on 20 April 2024. Demand can double in a month and the drip of new bitcoin will not change by a single coin.

So the price does the adjusting, all of it. A surge of buying cannot be met with extra production, and a rush for the exit cannot be softened by anyone holding supply back. That one design choice explains more of the chart than most people expect.

Not every coin is built this way, and Ethereum has no hard cap. Plenty of newer tokens have the opposite problem: vesting schedules that release large batches of coins to insiders and early backers on dates published well in advance. A token can look scarce right up until a cliff tips several months of new supply onto a thin market. Those calendars are public, and people still get caught out by them.

Demand tends to arrive in shocks

January 2024 was the clean kind of demand shock, an access event. The ETFs changed nothing about bitcoin itself, what changed was who could reach it without opening an exchange account, and that turned out to matter a great deal.

Macro is the heavier force, and the murkier one. The US Federal Reserve raised rates seven times through 2022, and bitcoin spent that year falling alongside tech stocks, trading like exactly the kind of speculative asset its early advocates had insisted it was not. When money gets expensive, speculation gets sold, and in 2022 the market filed crypto under speculation without asking anyone's opinion.

Policy can also slam a door: in May and June 2021 China ordered bitcoin mining shut down and pushed its financial institutions away from crypto altogether, and prices took months to digest it. Softer things count too, because a major exchange listing puts a coin in front of millions of new buyers overnight, and a narrative that catches on can do the same job with no listing at all.

The plumbing amplifies everything

Crypto trades 24 hours a day, seven days a week, across hundreds of venues. There is no closing bell, and there are none of the circuit breakers that halt a stock exchange when prices fall too fast. A move that begins at 3am on a Sunday keeps going until the other side shows up. Arbitrage traders keep the price on different venues within a whisker of one another, so there is effectively one global number, but nobody controls how quickly that number changes. The fourth halving fell on a Saturday, and nothing paused.

The practical corollary: price moves while you are typing your card number. It is why quoted purchase prices have a shelf life. Banxa, an on-ramp that has run fiat-to-crypto plumbing since 2014, locks its quote for roughly 3 minutes, so the number you approve is the number you pay, however jumpy that minute is.

Under every exchange price sits an order book, the standing offers to buy and sell at set prices. Crypto's books are shallow compared with the markets that trade Apple shares or US government debt. Ask for more than the book holds near the current price and the rest of your order fills at worse levels, rung by rung, and traders call the gap slippage. Shallow depth is also why the same headline that barely dents bitcoin can send a coin ranked 300th up 40% by dinner. Liquidity varies wildly from coin to coin, and for the same coin between a Tuesday afternoon and a Sunday night.

Borrowed money turns the volume up further: positions built on credit are forcibly closed when the price moves against them, and those forced sales push the price further still, which closes more positions. Most of crypto's famous worst days have a cascade like that somewhere in the middle. How they unwind belongs to the crash explainer rather than this one.

Mood, measured daily

Sentiment is easy to dismiss as fuzzy, but in crypto it is unusually visible. Fear-and-greed indices compress momentum, volatility and social chatter into a single figure published every day, and a lot of market participants glance at it before doing anything. Whether the index causes moves is hard to prove, that people act on it is not in much doubt, and for practical purposes the second thing matters more.

Smaller coins feel mood hardest: Dogecoin spent early 2021 converting tweets into double-digit moves, and it was never the only one. A coin with a shallow order book and a loud community can double on narrative alone, and it can halve the same way.

The quiet version shows up in stablecoin balances. Traders who want out of the volatility without cashing out to a bank park money in dollar-pegged coins and wait there. Rising stablecoin balances usually mean money waiting near the exit rather than money gone.

Knowing the forces is not the same as calling the winner

Here is the uncomfortable part: nearly everything above was public in advance. The ETF decision had a deadline, the halving had been in the code since 2009, and the Fed publishes its meeting calendar a year ahead. The market still wrong-footed people: bitcoin fell for a fortnight after the ETF launch, then set a record above $73,000 in March 2024, weeks before the halving that was supposedly the bullish trigger.

Supply schedules, demand shocks, thin order books, borrowed money, mood. Reciting the list is easy, and most traders can. Weighing the forces against one another next month is the part nobody has managed reliably, and the honest ones admit it. Treat this article as a description of the machine. If somebody also offers you the weather forecast, check what they are selling. It is usually a course.