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Subaccounts let a Direct account partition its balance and positions into independent buckets under one set of API credentials. Every account has a primary subaccount (number 0) and may use numbered subaccounts 1–63.
Subaccounts are currently an API-only feature — they are not yet supported in the Kalshi web or mobile app. Numbered-subaccount balances and positions are managed through the trade API.

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Numbering

NumberMeaning
0Primary subaccount (the default account)
1–63User-managed numbered subaccounts

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Transfers

You can move cash between your own subaccounts with POST /portfolio/subaccounts/transfer (amounts in cents). Transfers net to zero at the account level — nothing leaves your account. Transfers are idempotent on a client-supplied client_transfer_id: retrying with the same value returns 409 instead of applying the transfer twice.

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Listing transfers

GET /portfolio/subaccounts/transfers returns your subaccount transfers, paginated.