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Sentinel Documentation

Enterprise audit & compliance for x402 payments

Sentinel provides enterprise audit and compliance for x402 payments. AI agents spend real money autonomously via the x402 protocol — Sentinel tells you where it went.

Features

SDK

Drop-in wrapper for any x402 fetch. Budget enforcement, audit logging, spike detection — all configurable. Same fetch interface. Zero breaking changes.

Dashboard

Query spend by agent, team, endpoint, and time range. Export to CSV/JSON for compliance reviews. Alerts for violations and anomalies.

Policies

Per-call, hourly, daily, and lifetime spend limits. Endpoint allowlists/blocklists. Human approval workflows above configurable thresholds.

Before & After

Before (plain x402)

import { x402Client, wrapFetchWithPayment } from "@x402/fetch";
import { registerExactEvmScheme } from "@x402/evm/exact/client";

const client = new x402Client();
registerExactEvmScheme(client, { signer });
const fetchWithPayment = wrapFetchWithPayment(fetch, client);

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

After (with Sentinel)

import { x402Client, wrapFetchWithPayment } from "@x402/fetch";
import { registerExactEvmScheme } from "@x402/evm/exact/client";
import { wrapWithSentinel, standardPolicy } from "@valeo/x402";

const client = new x402Client();
registerExactEvmScheme(client, { signer });
const fetchWithPayment = wrapFetchWithPayment(fetch, client);

const secureFetch = wrapWithSentinel(fetchWithPayment, {
  agentId: "agent-weather-001",
  budget: standardPolicy(),
});

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

Same API. Budget enforcement + audit trail included.

Get Started

Quick Start

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