Monitoranywebsite.Knowwhenitchanges.
API-first change detection for developers and AI agents. One API call. Real-time webhooks.
$ Built for developers
Everything you need to monitor websites — anti-bot bypass, smart diffs, real-time webhooks, and a fully programmable API.
Bot Bypass
WatchTower engine
Handles JavaScript rendering, CAPTCHAs, and anti-bot protections automatically. Cloudflare, Akamai, DataDome — we bypass them all.
Smart Diff Engine
Intelligent change detection that ignores noise — timestamps, ads, session tokens. Get meaningful diffs only.
Webhooks
Real-time HTTP webhooks with HMAC signatures. Bring your own endpoint — Slack, Discord, or custom.
MCP Ready
First-class Model Context Protocol support. Let your AI agents monitor and react to web changes natively.
CSS Selectors
Target specific page elements. Monitor only the content that matters to you — prices, stock, text.
API-First
REST + OpenAPI + TypeScript SDK
Full REST API with OpenAPI spec and a type-safe TypeScript SDK. Create monitors, query changes, manage webhooks — all programmatically. Zero dashboard required.
How it works
Three steps to start monitoring
- 0101
Create a Monitor
Point us at any URL. Set your check interval, CSS selector, and webhook endpoint via API or dashboard.
curl -X POST /v1/monitors \ -d '{ "url": "https://..." }' - 0202
We Watch
WatchTower renders the page, extracts content, and runs our diff engine against the previous snapshot.
cron → scrape → diff → store
- 0303
You Get Notified
When content changes, we fire a webhook with the diff payload. Your agent or app reacts instantly.
POST webhook_url { "type": "change", "diff": ... }
Pricing
Simple, transparent pricing
Start free. Scale as you grow. No hidden fees.
- Popular
FAQ
Frequently asked questions
Start monitoring in
30 seconds
Create your free account, grab an API key, and make your first call. No credit card required.