Has anyone explored adding a daily (or per-epoch) spending limit to a proxy account — effectively creating a “hot wallet tier” that doesn’t require signing for every small transaction?
The idea
Polkadot’s proxy pallet already supports delegating specific call types to a sub-account. The missing piece is a value-bounded proxy: one that can submit balances::transfer calls autonomously up to a configured limit per time window, without prompting the parent account for a signature each time.
The parent account configures the limit and window once. After that, the sub-account spends freely within the allowance — any call exceeding the remaining balance is rejected at the proxy layer, not by the parent key.
Why this matters
For mobile and dapp use cases, requiring a signature on every micro-payment causes friction — but exposing the full account key to a less-secure environment isn’t acceptable either. A spending-limited proxy splits the difference: the parent key stays cold, the proxy key lives in browser storage or in mobile wallet app which could skip the pin prompt for it’s usage, and the worst-case exposure is bounded by the daily limit.