> For the complete documentation index, see [llms.txt](https://docs.usetrickle.xyz/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.usetrickle.xyz/core-concepts/security-and-custody.md).

# Security & Custody

Trickle is built around one principle: the protocol can only ever move your savings to an address you have registered. It cannot send your funds anywhere else. Ever.

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**One approval, chain-native protection**\
On HyperEVM, Trickle uses Permit2 to collect the savings slice from eligible ERC-20 swaps. On Solana, it uses SPL delegate approval on the specific token accounts you choose, so the permission model stays native to the chain.

**Pause any time**\
You can stop future collections whenever you want. Pausing does not trap funds, and pending balances can still be resumed or withdrawn through the on-chain flow.

**Non-custodial by design**\
Trickle is not a pooled vault or operator-managed account. It only collects the savings slice after eligible swaps and routes the result through a chain-specific contract flow with user-controlled withdrawal paths.

**Security by architecture**\
HyperEVM uses Permit2, keeper gating, SafeERC20, ReentrancyGuard, and allow-listed execution targets. Solana uses SPL delegate authority, PDA constraints, destination checks, and fail-soft collection logic to keep the protocol narrow, automated, and user-directed.


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