Sentinel + Arbex

Sentinel Finance

The control plane for AI spend and the execution runtime for approved SaaS actions. Sentinel decides what is allowed; Arbex runs it quietly with proof checks before money can move.

Request AccessSee the Platform
Chat-native requestsPolicy-verified executionQuiet background runsFinal-click guard
SentinelPolicy, approval, limits, audit.
ArbexSecure browser execution for approved work.
GuardrailsAmount, account, proof, and final-click checks.
HOW IT WORKS

Ask in chat. Execute under control.

Arbex feels conversational to the user, while Sentinel and deterministic guards handle approval, proof, and final-action safety behind the scenes.

CHAT-FIRST EXECUTION

No runbook. No special workflow. Just ask Arbex.

A finance teammate can request an action in plain language. Arbex turns the request into a governed execution plan, Sentinel checks the spend decision, and the browser runtime proceeds only when the proof matches.

  • + Natural-language SaaS requests.
  • + Tool calls and execution evidence stay visible in the conversation.
  • + The user is interrupted only when human action is required.
Arbex chat request and Sentinel tool execution inside Sentinel Finance
01

Ask

INTENT

A teammate asks for a SaaS action such as a credit top-up, seat change, or plan update.

02

Evaluate

SENTINEL

Sentinel checks vendor, amount, policy, approval threshold, budget, and risk context before execution starts.

03

Navigate

ARBEX

Arbex uses a managed secure browser and deterministic guards, with AI-assisted navigation only for bounded recovery.

04

Verify

FINAL CLICK

Local proof, amount, currency, account, and preconfirm evidence must match before a final action is allowed.

05

Record

EVIDENCE

The result separates automation outcome from financial outcome and stores the audit trail for review.

THE PROBLEM

The hard part is not clicking. It is controlled execution.

Sentinel and Arbex are built for the moment when AI moves from recommending software spend to actually operating SaaS billing surfaces.

01

AI spend needs a brake

Free-form browser agents can move faster than finance controls unless policy is enforced before execution.

02

SaaS billing UIs keep changing

Selector-only automation breaks when a vendor changes labels, modals, routes, or confirmation copy.

03

Receipts are not enough

Finance needs the approved intent, execution path, final evidence, and outcome state in one audit trail.

THE PLATFORM

Sentinel governs the intent. Arbex carries out the approved action.

Sentinel is the policy, approval, anomaly, and audit layer. Arbex is the controlled runtime that operates SaaS pages only after that governance path has produced trusted proof.

  • + Policy decisions happen before execution begins.
  • + Final-click checks run locally without new approval popups.
  • + Users are interrupted only for human verification, payment repair, policy review, or proof mismatch.
Sentinel governance console overview
SENTINEL CONTROLS

Governance that stays quiet until it matters.

Safety is enforced inside the execution path, not by asking the user to approve every small step.

P
BEFORE EXECUTION

Sentinel Decision

ALLOW, BLOCK, or REVIEW decisions based on vendor, action, amount, approval threshold, and organization policy.

R
WHEN REQUIRED

Human Review

Approvers are pulled in only when policy requires it or when the screen no longer matches the approved intent.

E
AFTER EXECUTION

Evidence Trail

Every run records preconfirm evidence, proof status, automation outcome, and financial outcome separately.

!
INCIDENT CONTROL

Freeze Switch

Operators can pause Arbex execution while preserving audit records and policy state for investigation.

OPERATING MODEL

AI-assisted navigation. Deterministic safety.

Arbex may ask AI to choose among bounded page candidates, but code guards own policy, proof, preconfirm, and final action safety.

Versioned rules for AI spend decisions

Policy authoring and rollout

  • +Define vendor, category, budget, and approval thresholds.
  • +Replay scenarios before moving rules into enforcement.
  • +Keep the policy decision tied to the Arbex execution record.
Policy authoring and rollout
A controlled runtime for approved SaaS work

Quiet Arbex operations

  • +Run approved actions in a managed browser profile.
  • +Use generic navigation recovery without vendor-specific final-click hacks.
  • +Stop only for MFA, CAPTCHA, payment repair, policy review, or mismatched proof.
Quiet Arbex operations
Separate automation success from financial success

Audit-ready outcomes

  • +Record whether the browser run completed, payment was accepted, declined, or not executed.
  • +Refresh and observe post-confirm state before summarizing the result.
  • +Keep heavy evidence packaging off the critical execution path.
Audit-ready outcomes
INTEGRATE IN MINUTES

One Sentinel decision before any agent spends.

Use Sentinel as the action authority for custom agents, internal tools, and Arbex-managed SaaS execution.

POST /api/action/evaluate
curl -X POST https://api.sentinelfinancehq.com/api/action/evaluate \
  -H "Authorization: Bearer $SENTINEL_AGENT_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "vendor": "OpenAI",
    "action_type": "saas.credit_topup",
    "amount": 5,
    "currency": "USD",
    "reason": "Restore API credit balance"
  }'
Trusted decision
{
  "decision": "ALLOW",
  "policy_version": 9,
  "trusted_decision": "attached_to_job",
  "execution_mode": "quiet_live_execute",
  "final_click_guard": "required"
}
Arbex does not need another Sentinel round trip at final click when trusted proof is already attached to the local job. The final guard is a local safety check.
EXTENSIBLE BY DESIGN

Start with prepared SaaS actions and add generic recovery where vendor interfaces change. The safety authority remains Sentinel and deterministic guards.

Credit top-upsSeat changesPlan upgradesSaaS billing consolesApproval queuesCustom agents
PRICING

Simple, transparent pricing

Every paid plan includes a monthly pool for policy evaluations, reviews, action requests, and Arbex execution events.

For early production teams

Starter

$29/mo
Includes 1,000 events, then $0.050 per event

Sentinel policy gating and audit records for teams preparing AI spend workflows.

  • + 1,000 included events / month
  • + $0.050 per additional event
  • + Sentinel decisions, approvals, and audit history
  • + Demo-ready Arbex setup path
Start Starter
Most Popular
Recommended for finance ops

Professional

$99/mo
Includes 10,000 events, then $0.020 per event

Higher included volume for teams running continuous policy checks and Arbex execution events.

  • + 10,000 included events / month
  • + $0.020 per additional event
  • + Quiet execution workflow support
  • + Priority onboarding for governed SaaS actions
Choose Professional
For heavy transaction throughput

Business

$299/mo
Includes 100,000 events, then $0.005 per event

Designed for multi-team deployments with high evaluation volume and controlled execution needs.

  • + 100,000 included events / month
  • + $0.005 per additional event
  • + Advanced evidence and reconciliation support
  • + Operational support for Arbex rollout
Go Business
Custom volume and controls

Enterprise

Custom

Annual terms, custom onboarding, and enterprise controls for regulated environments.

  • + Custom included event pool and pricing
  • + Dedicated onboarding and architecture review
  • + SSO / SAML and private deployment options
  • + Custom MSA, security review, and invoicing
Contact Sales
All plans include full API access, policy engine, and audit logs. Enterprise plans include custom SLAs and dedicated onboarding.
FAQ

Frequently asked questions

What is Sentinel Finance?

Sentinel is the governance layer for AI spend. It evaluates intent, applies policy, routes human review when required, and records the audit trail.

What is Arbex?

Arbex is the controlled SaaS execution runtime inside Sentinel. It uses a managed browser profile to carry out approved actions such as credit top-ups, seat changes, or plan updates.

Does AI decide final payment clicks?

No. AI may help choose among bounded page candidates when a SaaS UI changes, but code guards decide whether the action is allowed. Final-click proof, amount, account, and preconfirm checks remain deterministic.

When does Arbex interrupt the user?

Only when a person is truly required: MFA, CAPTCHA, card or payment method repair, explicit Sentinel REVIEW, or a mismatch between approved proof and the observed screen.

Do you replace Ramp, Stripe, or Brex?

No. Sentinel sits above existing cards, invoices, wallets, processors, and execution adapters. It governs and records the intent before money can move.

How is overage billing calculated?

We aggregate Sentinel decisions, reviews, action requests, and Arbex execution events into a monthly total. Overage beyond your plan is metered automatically.

What data do you store?

Policy configurations, Sentinel decision results, approval decisions, execution metadata, and audit records. We do not store payment card numbers, raw credentials, cookies, or session tokens.

Can we run in shadow or dry-run mode first?

Yes. Sentinel supports shadow evaluation, and Arbex can stop at preconfirm to capture evidence without submitting a final action.

GET STARTED

Ready to govern AI execution?

Start with Sentinel policy control, then add Arbex for quiet approved SaaS actions. Contact our team at hello@sentinelfinancehq.com for enterprise deployment and procurement support.

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