Built on x402 Protocol

Audit & compliance infrastructure for x402

Real-time transaction monitoring, budget enforcement, and audit trails for AI agent micropayments.

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notary — bash
Click to launch dashboard →@notary402/x402

What is Notary?

Notary is the audit and compliance layer for x402 payments. AI agents spend real money via the x402 protocol — Notary intercepts every payment, enforces budget limits, and logs a complete audit trail. One npm install. One line of code. Full visibility into where every dollar goes. 

Notary dashboard on MacBook

How it works

Every payment tracked. Every budget enforced. Full audit trail from agent to endpoint.

01

Install the SDK

npm install @notary402/x402
02

Wrap your fetch

One function call. No code changes to your agents.

03

Budgets enforced automatically

Per-call, hourly, daily limits. Blocked before payment.

04

Full audit trail

Every payment logged. Dashboard, filters, CSV export.

terminal
$ npm install @notary402/x402
added 1 package in 0.8s
$ node agent.js
[notary] agent researcher-01 initialized
[notary] budget: $25.00/hr enforced
→ GET https://api.example.com/data
← 402 Payment Required
→ x402 payment initiated $0.002
← 200 OK
✓ payment logged tx: 0x3a9f...c2e1
✓ audit record created rec_7kQ3mXvB9pLw
✓ budget remaining $24.998 / $25.00

Our products

@notary402/x402

SDK

Drop-in wrapper for x402 fetch. Budget enforcement, audit logging, spike detection. npm install and go.

Dashboard

Real-time spend analytics. Agent monitoring. Drill down by endpoint, category, network. CSV export for compliance.

Soon

Proxy

Zero-code integration. Change one URL. Every payment tracked. No SDK, no npm install, no code changes.

Budget Policies

Per-call, hourly, daily, total limits. Spike detection. Endpoint allowlists/blocklists. Preset or custom.

Audit Trails

Structured records for every payment. Agent, endpoint, amount, tx hash, timing, context. Queryable. Exportable.

Explorer

Public x402 payment explorer. Endpoint rankings, network stats, volume charts. Real transaction data.

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