Sentinel

Sentinel is the audit and compliance layer for x402 payments. AI agents spend real money autonomously — Sentinel intercepts every payment, enforces budget limits, and logs a complete audit trail. One npm install. One line of code. Full visibility.

Quick Start

Install the SDK and wrap your first fetch in under 5 minutes.

SDK Reference

Budget policies, audit ledger, storage backends, error handling, and types.

Guides

Single agent setup, multi-agent fleets, enterprise deployment, proxy mode.

Dashboard

Overview, payments, agents, and policy management from the web UI.

API Reference

Authentication, events ingest, payments, analytics, and management endpoints.

Proxy Mode

Zero-code integration. Change one URL and every payment is tracked automatically.

Before & After

Plain x402

const response = await fetchWithPayment(
  "https://api.example.com/paid"
);

With Sentinel

const secureFetch = wrapWithSentinel(
  fetchWithPayment, {
    agentId: "researcher-01",
    budget: standardPolicy(),
  }
);

Same API. Budget enforcement + audit trail included.