Price & availability changes
Price moves, discounts, stock and out-of-stock flips, plan and packaging changes, across listings and pricing pages.
Services — monitoring
Know the moment it changes. Not three weeks later.
Crawlify watches the sources that matter to you and catches the moment something changes — a price, a listing, a filing, a posting, a policy. But a change alert is only worth acting on if it's real. Every change we detect is verified to 99.5% field accuracy, with the before and after and a source you can open. Watching is layer one. Knowing the change is real, and what it means, is the point.
Monitor
LiveTimeSourceEventStatus
- 12:21 PMTodayCompetitor Pricingcompetitor.com/pricingNo changeChecked price, stock, and availabilityVerified
- 11:43 AMRecentlyProduct Listing Pageexample.com/products/123Change detectedPrice $29.99 $24.99Verified
- 10:18 AMTodayGovernment Filingsec.gov/filing/abc123No changeDocument structure unchangedVerified
- 09:42 AMTodayIndustry Newsnews.example.com/articleChange detectedHeadline updatedVerified
- 08:07 AMTodayPolicy Pagewebsite.com/policyNo changeContent verifiedVerified
Change detected
We detected a change on the source.
Before12:41 PM
Acme Pro Headphones
example.com/product/acme-pro
- Price
- $49.99
- Stock
- 42
- Rating
- 4.7
- Availability
- In stock
After12:42 PM
Acme Pro Headphones
example.com/product/acme-pro
- Price
- $39.99
- Stock
- 42
- Rating
- 4.7
- Availability
- In stock
Real Signal generatedThis verified change is now ready for you to act on.
12:42 PM TodayAcme Pro Headphones
Price changed
$49.99$39.99
VERIFIEDThe reframe
The problem was never getting the data once. It's knowing when it changes — and trusting the alert.
Most teams find out about the thing that mattered too late. A competitor repriced on Tuesday and you saw it the following Monday. A filing dropped and you heard about it from someone else. A listing changed and your data still showed the old version. By the time a one-time pull is delivered, the web has already moved.
Monitoring closes that gap but only if two things are true. The change has to be caught quickly, and the alert has to be real. Most monitoring tools fail the second test: they fire on every trivial pixel change and bury the one that matters under noise, or they flag a change that turns out to be a rendering glitch. Crawlify monitors continuously, then verifies every change before it reaches you, with the before and after attached. Fewer alerts. Real ones. Traceable.
Capability
Watch any source. Catch any change.
Monitoring is configured per source — what counts as a change, how often we look, and what's worth surfacing to you.
Content & status changes
Page content, terms, policy, status, and directory changes, with the before and after captured.
Threshold & event triggers
Only surface a change when it crosses a threshold you set, so you get the moves that matter, not every micro-edit.
New & removed items
New listings, postings, filings, or products appearing; existing ones disappearing. The appearance and the removal both matter.
Scheduled & incremental checks
Re-check on your cadence, near-real-time to periodic, catching only what changed since the last run, per source.
Multi-source watch
Monitor many sources at once against one watchlist, normalized so a change anywhere reaches you the same way.
Provenance
An Alert, Or A Change You Can Act On.
Every change we surface carries the before, the after, when it happened, and a source you can open. That’s a change you can act on, not just an alert that something moved.
Talk to uschange_record.json
{
"change_id": "CHG-772104",
"monitored_source": "competitor_pricing_page",
"signal_type": "price_change",
"field": "price",
"before": "8999.00",
"after": "7499.00",
"currency": "INR",
"pct_change": -16.7,
"correlated_signals": ["stock_status_in_stock"],
"detected_at": "2026-08-12T04:02:19Z",
"verifier_id": "hv-6612",
"source_url": "https://example-competitor.com/p/wireless-headphones",
"confidence": 0.997,
"verified_fields": ["before", "after", "source_url", "detected_at"]
}How It Works
A managed service, not a tool you rent by the request.
- 01
Scope
You bring the sources and the target schema. We confirm what's public, what's feasible, and the cadence.
- 02
Deliver
Project-based verified pulls into your stack.
- 03
Graduate to feeds
As volume and cadence grow, one-time pulls become continuous feeds. Projects first, feeds as you scale.
Fit
Where managed, verified monitoring fits versus change-alert tools.
Two honest alternatives: a homegrown cron scraper, or an off-the-shelf change-detection widget. Both stop at “something changed.”
| Capability | DIY cron scraperyour own scheduled job | Change-alert toolsVisualping, Distill, Hexowatch | Crawlify |
|---|---|---|---|
| Detects that a page changed | Partial — you build it | core strength | |
| Verifies the change is real (not a glitch or trivial edit) | fires on any diff | 99.5% SLA | |
| Structured before/after at the field level | Partial — visual/text diff | ||
| Threshold logic (only surface changes that matter) | You build it | Limited | |
| Correlation (change becomes a signal joined to others) | |||
| Delivered into your stack, managed | You build it | Email / Slack alerts only | |
| Model | Your engineers' time | Per-page subscription |
Case Study
Academic event data pipeline — ScholarMeet
Crawlify powers the data pipeline behind ScholarMeet. What would have taken our team weeks of manual work now runs continuously with verified accuracy.
www.scholarmeet.com
Read Full Case Study
Use cases
What teams use managed extraction for.
Compliance
Public data, collected responsibly.
We work from public sources, at respectful request rates, in line with the rules that apply. Compliance isn’t an afterthought bolted on at the end — it’s part of how the data is collected and verified, which is also why it holds up when someone asks where it came from.
Frequently asked questions
No. Change-detection widgets tell you a page changed — including trivial and false changes. Crawlify monitoring verifies every change is real, captures the structured before and after, applies your thresholds so you only get changes that matter, and delivers them into your systems. It's a managed service, not an alert widget you configure and babysit.
Have a watchlist in mind?
Tell us the sources and what counts as a change worth knowing, and we'll tell you what's feasible, what's verifiable, and how we'd deliver it. Scoping call, not a sales pitch.
Talk to us
Become a data partner
Working with us on a vertical where verified change data becomes a shared dataset? That's the data-partner track.
Become Data Partner