How to set a spend budget for an AI agent wallet without touching its keys
GetAgentCap team · published 9/19/2026
You set a budget by telling AgentCap a ceiling and a public address — nothing about the agent's keys, signing logic, or wallet software changes. The budget is a read-side alert, not a spending limit the chain enforces, and that gap is the thing to understand before you rely on it.
What "setting a budget" actually configures
You register a wallet address under an agent name and set a ceiling in USDC. We watch outbound Transfer events from that address and compare the running total against your ceiling. Nothing on the agent's side changes — no new signing key, no spending-limit contract, no wallet-connect handshake.
That means setup is genuinely two fields: an address and a number. If your agent already has a wallet and is already transacting, there's no code change on the agent's side to get a budget watching it.
The gap this leaves
Because we're reading, not gating, an agent can still send a transaction that blows through the ceiling before we ever see it — we alert after the fact, on the next poll, not before the transfer confirms. If you need a hard, on-chain-enforced cap that blocks the transaction itself, that's a smart-contract wallet or a programmable spending-limit module, and it's a different (and more invasive) integration than this.
We haven't found a way to close that gap without asking for exactly the kind of access — a signing key, a session key, a wallet-connect grant — that we've decided not to ask for. That's the trade we're making, not a limitation we're hiding.
What this means for your fleet
If "budget" means "get paged when an agent overspends," this covers it with zero key exposure. If "budget" means "physically cannot overspend," you need an on-chain spending-limit mechanism in addition to this, and the two aren't a replacement for each other.