Snapshots: Aug 26 launch 7.4 Aug 26 discovery –

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PairBook: Stock & ETF Correlation and Overlap Database

Correlation, covariance, beta and holdings overlap for 4755 US stocks and ETFs. 52,358 pair analyses, free JSON API. Updated 2026-08-25.

Finance

Added August 26, 2026 · Last analysed August 26, 2026 · via StackScope Discovery · also on Hacker News

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Screenshot of PairBook: Stock & ETF Correlation and Overlap Database

StackScope is a free public catalogue of indie launches. We find launches on Product Hunt, Hacker News and similar feeds, then crawl each site to detect its tech stack and score it for launch readiness: DNS, security headers, SEO basics. This page is what we saw on 26 August 2026; the live site may have changed since.

PairBook: Stock & ETF Correlation and Overlap Database is largely in shape, with a complete set of security headers, a thorough launch checklist, and clean crawl signals. Worth fixing first: incomplete legal pages and no email security records.

The site is hosted on Vercel. The crawl picked up 4 technologies on this site, covering DNS providers, hosting, security, and seo. The stack includes Google Search Console, HSTS, and Vercel.

For context, it's running the same core stack as 4,000 other launches and tighter on security headers than most StackScope Discovery launches.

If you own this site, refresh the snapshot and see the full fix list any time →

7.4
StackScope Score
Good
84/100 Launch Readiness
Well prepared
6/6 Security Headers
Strong
0/3 Legal
Missing
2/2 Crawl files
Complete
100/100 Performance
Fast
Vibe Score 0 · No AI signals
How much the site looks AI-generated. Informational pattern-match signal, not a verdict. Does not feed the StackScope Score. See which fingerprints fired →

Tech Stack (4)

Infrastructure
DNS Vercel DNS
Hosting Vercel
Security HSTS
Analytics & Marketing
SEO Google Search Console

Infrastructure

Network
AMAZON-02 - Amazon.com, Inc., US
AS16509 · US
DNS
Vercel DNS
Authoritative nameserver
DNSSEC
Not enabled
DNS responses unsigned. Cache-poisoning vulnerable.
Green hosting
Not green hosted
No green-energy record. Data from The Green Web Foundation.
SSL Certificate
Let's Encrypt
Valid 26 Aug 2026 to 24 Nov 2026
Certificate as captured in this snapshot, not a live check.

Email Security

✗
SPF Not published. Your domain can be spoofed in phishing emails.
?
DKIM Not detected at common selectors. Your provider may use a custom one.
✗
DMARC Not published. Receivers fall back to permissive defaults.
?
MTA-STS Not deployed. Mail to your domain can be downgraded to plaintext en route.
?
TLS-RPT Not configured. You won't hear about silent SMTP TLS handshake failures.

Storage (0)

This site uses no client-side storage we could detect on page load.

Readiness Breakdown How?

✓ Custom title and meta description
⚠
Open Graph tags (title, image, description) (partial) missing og:image
✓ Canonical URL declared
✓ Responsive viewport meta tag
✓ Favicon present
✓ Semantic HTML (nav, main, article)
- Twitter card meta tags

Performance How?

297 ms Server response
54% Faster than peers
180 ms Largest contentful paint
0.00 Cumulative layout shift
7 KB Page weight
1 KB Image weight
1 Third-party domains
0 Console errors
0 Failed requests

Indicative grade from a single automated render, not a substitute for Lighthouse or field data, and not part of the StackScope score.

AI Stance

No AI stance declared
✗ llms.txt published
✓ No AI bots blocked in robots.txt
Content-Signal
? No directive declared
Link headers
? None advertised

Well-Known Files

✓ robots.txt
✓ sitemap.xml (4 URLs)
✗ security.txt
✗ llms.txt
✗ ads.txt
✗ humans.txt

Legal

? Privacy Policy not detected
? Terms of Service not detected
Detection works best on English language sites.

Security Headers (6/6)

✓
Referrer-Policy
✓
X-Frame-Options
✓
Permissions-Policy experimental (check browser support)
✓
X-Content-Type-Options
✓
Content-Security-Policy
✓
Strict-Transport-Security
–
X-XSS-Protection deprecated (use Content-Security-Policy)

Build

0 JS files
0 CSS files
1 Third-party domains

Brand Colours

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