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A bitcoin ATM is an internet machine that allows a person to exchange bitcoins and cash. Some Bitcoin ATMs offer bi-directional functionality enabling both the purchase of Bitcoin as well as the redemption of Bitcoin for cash. In some cases, Bitcoin ATM providers require users to have an existing account to transact on the machine.
Bitcoin machines are not ATMs in the traditional sense and probably use the wording ATM as a neologism. Bitcoin kiosks are machines which are connected to the Internet, allowing the insertion of cash in exchange for bitcoins given as a paper receipt or by moving money to a public key on the blockchain. They look like traditional ATMs, but Bitcoin kiosks do not connect to a bank account and instead connect the user directly to a Bitcoin exchange. According to an advisory issued by the Consumer Financial Protection Bureau, "they may also charge high transaction fees – media reports describe transaction fees as high as 7% and exchange rates $50 over rates you could get elsewhere".:3
On October 29, 2013, a Robocoin machine opened in the Waves coffee shop in downtown Vancouver, Canada. This machine is understood to be the world's first publicly available bitcoin machine. Robocoin ceased operations in January 2016. Some Robocoin machines have since then been converted to run other software. The first machine in the United States went online on February 18, 2014, in a cigar bar in Albuquerque, New Mexico. It was removed 30 days later. In late 2013, The D Casino install the first Bitcoin ATM in a casino in Las Vegas.  A New Zealand bitcoin machine operator announced in 2014 they had to shut-down operations due to interference with banks. In 2014 a former Robocoin operator in the UK hacked its bitcoin ATMs to run on software from rival manufacturer Lamassu.
Bitcoin machines are not yet regulated in Canada, however regulations have been officially proposed for all bitcoin exchangers. In February, 2014, the Canadian Finance Minister mentioned plans to introduce anti-money laundering and anti-terrorist financing regulations for virtual currencies such as Bitcoin.
According to Coin ATM Radar, there are more than 800 Bitcoin ATMs in the United States as of 2017, with small shop owners earning a reported $300 a month for rental space. Transactions fees for ATM use are approximately 16 percent, while online transaction fees run about 7.5 percent. Part of the bitcoin ATMs operating in the US is imported from all over the world, for example from Prague. Czech company General Bytes has placed its machines in Las Vegas among other american cities.
Bitcoin ATM operators need to adjust the limits on deposits and withdrawals according to AML/KYC standards applicable in the jurisdiction where their ATMs are placed.  In some countries / states this requires a money transmitter license.
Media related to Bitcoin ATMs at Wikimedia Commons