SecondSign is the independent authorization and evidence layer for AI agents executing high-consequence transactions — a deterministic boundary on the execution path, in front of every irreversible action. Agent wallets are the first rail, not the product boundary.
Request accessThe decision path
Every action an agent takes to move money passes through one path, fail-closed, monotonic, and re-verified at the exact moment of execution.
Each action becomes a digest-bound intent. Raw account data never crosses the trust boundary.
One monotonic verdict. Uncertainty always resolves to the strictest available path.
Every decision leaves a redacted, hash-chained receipt. No raw financial data, ever.
Actions above a policy threshold route to a one-shot, TTL-bound maker-checker before they can execute. Nothing moves until it is signed off.
Rules and providers evaluate every intent. Combining their judgements can only tighten the outcome, never widen what an agent is allowed to do.
The decided value is bound to an intent digest and re-checked the instant before the gateway executes. Decided value equals executed value.
The agent holds no rail credential and has no network route to the rail. Stop SecondSign and it simply cannot move money.
A hash-chained, redacted receipt records what was decided and why, without ever storing raw financial or customer data.
Guardrails
SecondSign decides, deterministically, whether an agent's action is allowed, and re-checks it the instant before any money actually leaves.
Where it fits
Wherever an agent can move funds, SecondSign sits in front of it, the same deterministic checkpoint, whatever the rail or the workflow.
Agents that pay vendors and settle invoices, held the moment an amount crosses a policy threshold.
Buying agents bound to approved vendors and spend limits - anything off the allowlist stops.
Movement between accounts and rails, with a human required the instant a move gets large.
What your team gets
Every decision leaves a hash-chained, redacted receipt - prove what happened without ever storing raw financial data.
Agents never hold a rail credential or a route to the rail. Stop SecondSign and money simply cannot move.
High-value actions wait for a real, TTL-bound signature before anything executes. Agents act; people stay accountable.
Agents reach the rails only through SecondSign. Humans own the policies and the approvals, through the API, the CLI, or the console.
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