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Introduction
Concepts

Concepts

Hyperliquid has a few rules that every integration runs into: actions are signed, markets are addressed by numeric asset IDs, prices must fit a tick grid, and every action carries a nonce. These pages explain how the SDK maps them.

Signing and keys
Signers, API wallets, L1 vs user-signed actions, KMS keys and networks.
Markets and numbers
Asset IDs, spot and builder-dex names, Decimal, tick and lot sizes.
Errors
APIError, per-item StatusError, WebSocket errors and ambiguous outcomes.
Nonces, vaults and expiry
How nonces are drawn, trading for vaults and sub-accounts, expiring actions.
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