# Verid

> Verid is a developer-first web change-detection API. Monitor any URL and receive structured webhook notifications when content changes.

Append `.md` to any blog post, use-case, guide, or curated marketing page to get the raw Markdown source. The technical docs (REST API, SDK, predicates, extraction, webhooks) live at docs.verid.dev - see docs.verid.dev/llms.txt.

## Marketing

- [Verid (home)](https://verid.dev/index.md): Overview, fetching strategy, and tiers at a glance.
- [Pricing](https://verid.dev/pricing.md): Free, Starter ($19), Pro ($79), Scale ($299). Limits per plan.
- [About](https://verid.dev/about.md): Why we built Verid and what we focus on.
- [Contact](https://verid.dev/contact.md): Support, security disclosure, partnerships.
- [Features overview](https://verid.dev/features.md): Change detection, extraction, notifications, API.
- [Feature: Change detection](https://verid.dev/features/change-detection.md): Predicate-based diffing - fire only on meaningful changes.
- [Feature: Extraction methods](https://verid.dev/features/extractors.md): CSS, XPath, JSONPath, regex, full-page hashing, LLM prompts.
- [Feature: Notifications](https://verid.dev/features/notifications.md): Webhooks (HMAC-signed), Slack, Discord, email. Retries + replay.
- [Feature: REST API + SDK](https://verid.dev/features/api.md): OpenAPI 3.1 spec, @verid.dev/sdk Node.js client.

## Blog

- [Best SERP Analysis Tools in 2026 (Rank Trackers + Change Detection)](https://verid.dev/blog/best-serp-analysis-tools.md): The 10 best SERP analysis tools in 2026 - from rank trackers to change-detection monitors. Compare features, pricing, and AI Overview support to find the right fit.
- [Introducing Verid: Monitor Any URL, Get Notified When Things Change](https://verid.dev/blog/introducing-watchtower.md): Verid is a developer-first API for web change detection. Here's why we built it, how it works, and how to get started in under 5 minutes.

## Use cases

- [Competitor Price Tracking](https://verid.dev/use-cases/competitor-price-tracking.md): Watch every competitor SKU you care about and get notified the moment a price moves - without scraping infrastructure or daily manual checks.
- [GitHub Release Monitoring](https://verid.dev/use-cases/github-release-monitoring.md): Get notified the moment a tracked repository publishes a new release - and only the real ones, not prereleases or tag spam.
- [SERP Monitoring](https://verid.dev/use-cases/serp-monitoring.md): Track how your business and your competitors appear on Google - rank position, AI Overviews, featured snippets, People Also Ask - and get notified the moment the page shifts.
- [Appointment and Calendar Slot Availability](https://verid.dev/use-cases/appointment-and-calendar-slot-availability.md): Get notified the moment an appointment, reservation, or event slot opens up - for medical visits, restaurants, classes, and ticketed events.
- [Competitor Tech Stack Change Detection](https://verid.dev/use-cases/competitor-tech-stack-changes.md): Get notified when a competitor swaps their analytics, payments, or CMS - a strong leading indicator of strategy and engineering direction.
- [Crypto Price Alerts via CoinGecko](https://verid.dev/use-cases/crypto-price-alerts.md): Track any coin's price and fire an alert on percent moves - cleaner than exchange-side alerts and integrated with your own infrastructure.
- [Regulatory Filings and Policy Page Monitoring](https://verid.dev/use-cases/regulatory-filings-and-policy-pages.md): Catch policy and regulatory updates on government and agency pages - without staffing someone to refresh those pages daily.
- [Scholarship and Grant Deadline Tracking](https://verid.dev/use-cases/scholarship-and-grant-deadlines.md): Watch funding-opportunity pages so deadline changes, new postings, and reopened cycles don't slip past your team.
- [Academic Journal and Paper Update Alerts](https://verid.dev/use-cases/academic-journal-and-paper-updates.md): Watch journal issue pages and preprint servers for new papers matching your interests - without waiting for the weekly digest.
- [Competitor Ad and Landing Page Copy Tracking](https://verid.dev/use-cases/competitor-ad-and-landing-copy-changes.md): Watch competitor landing pages for headline, CTA, and positioning changes - early signal that a campaign or product launch is coming.
- [NPM Package Version Tracking](https://verid.dev/use-cases/npm-package-version-tracking.md): Detect new versions of any npm package the moment they're published - useful for security patches, dependency upgrades, and ecosystem watch.
- [Shopify Product Stock & Price Monitoring](https://verid.dev/use-cases/shopify-product-stock-and-price.md): Track price and stock changes on any Shopify product page - competitors, suppliers, or your own catalog after a redeploy.
- [Stock Price Drop Alerts](https://verid.dev/use-cases/stock-price-drop-alerts.md): Get an alert when a watched ticker moves past a threshold - without paying for a real-time market data feed.
- [WHOIS and Domain Ownership Change Detection](https://verid.dev/use-cases/whois-and-domain-ownership-changes.md): Track domain registration, registrar, and nameserver changes - useful for brand protection, M&A signal, and incident response.
- [Etsy Shop New Listings Monitor](https://verid.dev/use-cases/etsy-shop-new-listings.md): Get notified the moment a favorite Etsy seller posts a new listing - useful for collectors, resellers, and merch buyers tracking limited drops.
- [Job Listings Watch for Keywords](https://verid.dev/use-cases/job-listings-for-keywords.md): Get alerted the moment a job board posts a listing matching your filters - for recruiters, candidates, or competitive intelligence.
- [Mortgage and Loan Rate Tracking](https://verid.dev/use-cases/mortgage-and-loan-rate-tracking.md): Watch published mortgage, auto, and personal loan rates and fire an alert when they move enough to be worth refinancing or locking in.
- [PyPI Package Update Alerts](https://verid.dev/use-cases/pypi-package-updates.md): Watch any PyPI package and get notified the moment a new version is published - for security patches, version pinning, or upstream tracking.
- [SaaS Competitor Pricing and Plan Monitoring](https://verid.dev/use-cases/saas-competitor-monitoring.md): Track when a SaaS competitor changes plan names, tier prices, feature inclusions, or annual discounts - the first signal of a strategic pricing move.
- [Terms of Service and Privacy Policy Drift Detection](https://verid.dev/use-cases/terms-of-service-and-privacy-policy-drift.md): Watch vendor ToS and Privacy Policy pages for any update - automatically - so your legal team isn't blindsided by silent revisions.
- [Currency and FX Rate Monitoring](https://verid.dev/use-cases/currency-fx-rate-monitoring.md): Track exchange-rate moves between any pair and get notified when crossing a threshold worth acting on - for travel, remittance, or treasury.
- [Government Contract and Tender Posting Alerts](https://verid.dev/use-cases/government-contract-and-tender-postings.md): Watch public procurement portals for new RFPs and tender postings matching your keywords - without daily portal logins.
- [Restock Alerts for Out-of-Stock Products](https://verid.dev/use-cases/restock-alerts.md): Catch the exact moment a sold-out product becomes available again - for concert merch, limited drops, or any high-demand SKU.
- [SEO Title and Meta Description Drift Detection](https://verid.dev/use-cases/seo-title-and-meta-description-drift.md): Catch silent SEO-critical metadata changes on your own pages or a competitor's - the kind of drift that explains last week's traffic dip.
- [Status Page Incident Detection](https://verid.dev/use-cases/status-page-incident-detection.md): Watch AWS, Stripe, GitHub, and any other vendor's status page and route incidents into your own incident-response channels - faster than email subscriptions.
- [Amazon Product Watch - Price, Availability, Reviews](https://verid.dev/use-cases/amazon-product-watch.md): Track price drops, stock state, and review counts on any Amazon listing without building a scraping stack or relying on extension-based tools.
- [JSON API Field Monitoring](https://verid.dev/use-cases/json-api-field-monitoring.md): Watch any JSON endpoint for changes to a specific field - feature flags, internal counters, third-party APIs, anything that returns JSON over HTTP.
- [Airline and Hotel Fare Drop Alerts](https://verid.dev/use-cases/airline-and-hotel-fare-drops.md): Watch specific routes and properties for price drops and fire an alert only when the drop crosses a threshold worth acting on.
- [MAP Pricing Compliance Monitoring](https://verid.dev/use-cases/map-pricing-compliance.md): Catch resellers advertising your product below your Minimum Advertised Price - per listing, within hours, before it erodes your channel pricing.
- [RSS Feed New Item Alerts](https://verid.dev/use-cases/rss-feed-new-items.md): Catch the moment any RSS or Atom feed gets a new entry - for blogs, podcasts, security advisories, news, or vendor changelogs.
- [Sitemap.xml New URL Detection](https://verid.dev/use-cases/sitemap-new-urls.md): Get notified when a site adds new URLs to its sitemap - useful for SEO competitive watch, content discovery, and catching new product pages.

## Guides

- [How to Use CSS Selector Extraction](https://verid.dev/guides/css-selector.md): Target HTML elements by class, ID, or attribute and pull out their text. The fastest method for well-structured pages.
- [How to Use XPath Extraction](https://verid.dev/guides/xpath.md): Navigate the full document tree with XPath expressions. More powerful than CSS selectors for complex conditions, attribute access, and partial text matching.
- [How to Use JSONPath Extraction](https://verid.dev/guides/jsonpath.md): Query JSON API responses and embedded JSON data using JSONPath expressions - the JSON equivalent of XPath.
- [How to Use Regex Extraction](https://verid.dev/guides/regex.md): Run regular expressions against raw page source to extract versioned strings, counts, prices, or any pattern that appears in the HTML or text.
- [How to Use Full Page Hash](https://verid.dev/guides/full-page-hash.md): Detect any meaningful change on a page without configuring selectors. Verid normalizes the HTML and computes a hash - if anything changes, you hear about it.
- [How to Use AI (LLM) Extraction](https://verid.dev/guides/llm-ai-extraction.md): Describe what you want to extract in plain English and let the AI figure out the rest. Works on any page, including JavaScript-heavy and unstructured content.

## Optional

- [Technical docs](docs.verid.dev/llms.txt)
- [Combined technical docs](docs.verid.dev/docs.md)
- [OpenAPI 3.1 spec](https://api.verid.dev/api/openapi.json)