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A merchant is a trade or service business that accepts payment cards and, in many cases, cryptocurrencies. The term comes from the English word merchant.

A merchant account is a special trade account for a business used to accept non-cash payments by cards and over the internet. It links the seller to the payment infrastructure and the acquiring bank.

A microtransaction is a payment of a very small amount, often less than the minimum monetary unit. Such operations are unprofitable for traditional payment systems because of fees, while cryptocurrencies make them feasible.

A millibitcoin (mBTC) is one thousandth of a bitcoin, that is, 0.001 BTC. This fractional unit is used to conveniently display small amounts in this cryptocurrency.

Mt. Gox is one of the first and largest Bitcoin exchanges, based in Japan. Its closure after a major loss of funds became one of the most famous events in the history of cryptocurrencies.

Multisignature is a technology in which carrying out a transaction requires not one but several signatures with different private keys. It noticeably increases the security of storing crypto assets.

Instamine is an unfair distribution of coins at the very earliest stage of a project's launch, when a large share of the issuance ends up with a narrow circle of participants. This undermines trust in the currency.

An API is a software interface that allows developers to use the ready-made functions of one service inside another application. In the crypto industry, APIs are used to connect data from exchanges, wallets, and analytics.

Chop is short-term price swings within a narrow price range that, as a rule, do not lead to a sustained move up or down. The price seems to "dangle" between nearby levels.

Ether (Ether, ETH) is the native cryptocurrency of the Ethereum blockchain platform, the second most important in the industry. In traders' jargon there are playful distortions of the name — "kefir," "efir," "zemfir" — but they always refer to one asset.