Essentially, a mainnet swap consists of switching from one blockchain network to another. In most cases, the swap takes place when a cryptocurrency project migrates from a third party platform (e.g., Ethereum) to their own native blockchain network. At this point, their cryptocurrency tokens are gradually replaced by newly issued coins and all blockchain activity is moved to the new chain.
Let’s take BNB as an example. After the main net launch of Binance Chain, users were encouraged to migrate from the Ethereum blockchain to the Binance Chain.
Therefore, ERC-20 BNB token holders started to replace their tokens with the newly issued BEP2 BNB coin (the native coin of Binance Chain). The mainnet swap followed a 1:1 ratio so that 1 ERC-20 BNB had the same value as 1 BEP2 BNB. After the swap, all remaining ERC-20 BNB tokens were burned, so now only the BNB of the new chain can be used.
Therefore, a mainnet swap takes place when a blockchain project replaces previously issued tokens with their new cryptocurrency, which is typically running on their own blockchain network. This process may also be referred to as “token migration”. Usually, the mainnet swap begins right after the mainnet launch.
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