Add Wallet is for advanced API users. It lets you manually create and specify keys. The recommended (and simpler) method is Generate Wallet with the SDK or BitGo Express. You can also create wallets in the BitGo UI.
This API creates a new wallet for the user or enterprise. The keys to use with the new wallet (passed in the 'keys' parameter) must be registered with BitGo prior to using this API.
BitGo currently only supports 2-of-3 (e.g., m=2 and n=3) wallets. The third key, and only the third key, must be a BitGo key. The first key is by convention the user key, with its encrypted xprv stored on BitGo.
Ethereum and XRP wallets can only be created under an enterprise. Pass in the id of the enterprise to associate the wallet with. Your enterprise id can be seen by clicking on the "Manage Organization" link in the enterprise dropdown. Using the Add Wallet API, you can create a wallet using either the enterprise fee address (used by default for all wallets in the enterprise), or a unique fee address (created manually with the Keychains API). Pass the desired key as the third key ID in the 'keys' array. In either case, the fee address must be funded before creating the wallet.
You cannot generate a wallet by passing in a subtoken (i.e. ERC20 token) as the coin. Subtokens use the wallet of their parent coin and it is not possible to create a wallet specific to one token. For example, to create a wallet for an ERC20 token, create an Ethereum wallet. It can hold any ERC20 tokens as well as Ether.
BitGo Ethereum wallet is a smart-contract implementing multi-signature scheme. Because contracts itself can not initiate transactions, fee addresses are used for this purpose. Ethereum transactions initiated by a given address, are confirmed by the network in order of creation, so one lower fee transaction can potentially delay all subsequent transactions. To help lower network fee costs, two fee addresses are provided.
feeAddress is a main fee address usable for all operations.
lowPriorityFeeAddress is a secondary fee address that can be used to pay
lower fee for Create Address operations without risking delaying subsequent
higher-priority transactions initiated by main fee address.