Slippage is the difference between the expected and the actual execution price of an order on a cryptocurrency exchange. It arises from market movement and a lack of liquidity.

A payment service provider (Payment Service Provider, PSP) is a service that allows payments to be accepted and sent by various methods, combining many payment methods in a single interface for businesses and users.

A private key (private key) is a secret string that gives control over a cryptocurrency wallet and allows transactions to be signed. Its loss or disclosure means the loss of access to funds.

Premining (premine) is the mining of part of the coins by a cryptocurrency's creators before its public launch. It can be used transparently to fund the project or serve as a tool for abuse and manipulation.

A Pre-ICO (token presale) is a preliminary stage of token sales before the main ICO round. It helps a project raise starting funds for marketing, development and the preparation of a full-fledged campaign.