What is a Custodial Wallet?
A custodial wallet is a cryptocurrency wallet where a third-party service (exchange, provider, or institution) holds and manages the private keys on behalf of the user, controlling access to the funds.
WHY IT MATTERS
When you hold crypto on Coinbase, Binance, or any centralized exchange, you're using a custodial wallet. The exchange holds your keys and executes transactions on your behalf. It's convenient — no key management, no seed phrases to lose — but you don't truly control your funds.
'Not your keys, not your coins' is the crypto maxim that captures the risk. Custodial wallets mean trusting the custodian. FTX's collapse demonstrated the catastrophic failure mode: when the custodian fails or is dishonest, users lose everything.
For AI agents, custodial wallets add counterparty risk on top of agent risk. If the custodian goes down, every agent using that service stops functioning. Non-custodial approaches — where the operator holds keys and uses smart contracts for controls — eliminate this dependency.
HOW POLICYLAYER USES THIS
Unlike custodial solutions, PolicyLayer never holds your private keys. Spending controls are enforced through smart contracts and policy validation — the operator retains full custody while agents operate within defined limits.