What is a Hot Wallet?
A hot wallet is a cryptocurrency wallet whose private keys are stored on an internet-connected device, enabling instant transaction signing and execution but exposing the keys to online attack vectors.
WHY IT MATTERS
Every AI agent wallet is inherently a hot wallet. Agents need to sign and submit transactions programmatically, which requires the private key to be accessible to software running on internet-connected infrastructure. There's no 'cold' option for autonomous operations.
This creates a fundamental security challenge. Hot wallets are convenient but vulnerable — malware, server compromises, insider access, and API exploits can all expose keys. Exchanges and services have lost billions through hot wallet compromises.
The traditional mitigation is minimizing hot wallet balances — keeping most funds in cold storage and only loading what's needed for operations. For agents, this means funding wallets with just enough for planned operations rather than maintaining large balances.
HOW POLICYLAYER USES THIS
Agent wallets are hot by nature — PolicyLayer adds the control layer that hot wallets lack. Per-transaction limits, rolling budgets, and recipient whitelists ensure that even if a hot wallet key is compromised, the damage is bounded.