Bitstamp is a Luxembourg-based cryptocurrency exchange founded in 2011. Considered the world’s longest-running cryptocurrency exchange, its business operations are conducted from its registered headquarters in Luxembourg City, with a satellite office in Ljubljana.

It allows trading between fiat currency, bitcoin and other cryptocurrencies, such as the U.S. dollar, the euro, the pound sterling, Ethereum, Litecoin, Ripple, Bitcoin Cash, Algorand, Stellar, and USD Coin.

Bitstamp was founded as a European-focused alternative to then-dominant bitcoin exchange Mt. Gox. While the firm trades in US dollars, it accepts fiat money deposits for free only via the European Union's Single Euro Payments Area, a mechanism for transferring money between European bank accounts.

Nejc Kodrič, a widely known member of the bitcoin community, co-founded the company in August 2011 with Damijan Merlak in his native Slovenia, but later moved its registration to the UK in April 2013, then to Luxembourg in 2016. Bitstamp outsourced certain operations to the UK due to the lack of adequate financial and legal services in Slovenia. It was backed by the United States hedge fund Pantera Capital.

When incorporating in the United Kingdom, the company approached the UK's Financial Conduct Authority for guidance, but was told that bitcoin was not classed as a currency, so the exchange was not subject to regulation. Bitstamp says that it instead regulates itself, following a set of best practices to authenticate customers and deter money laundering.

In February 2014, the company suspended withdrawals for several days in the face of a distributed denial-of-service. Bitcoin Magazine reported that people behind the attack sent a ransom demand of 75 bitcoins to Kodrič, who refused due to a company policy against negotiating with “terrorists”.

In January 2015, Bitstamp suspended its service after a hack during which less than 19,000 bitcoins were stolen, reopening nearly a week later.

In September 2018 the New York Attorney General office produced a 42-page "Virtual Markets Integrity Initiative Report", after requesting fourteen virtual currency exchanges to participate in a survey. The report aimed to create greater transparency regarding security, anti-hacking measures and business practices.

Bitstamp was among ten platforms that responded; it is noted that of these ten, Bitstamp was among the seven that confirmed that they had sought approval, directly or through a subsidiary, from the New York State Department of Financial Services (“DFS”) to operate a virtual currency business in New York State. The report goes on to say that such approval implies an agreement to actively protect deposited funds, prevent money laundering and illegal activity, and respond to other risks. Bitstamp was one of two exchanges that claimed to block access to their exchange by VPNs.

In addition to providing fee policies, Bitstamp also claimed to conduct audits of their virtual currency holdings.