Risks in SI Quotations That Include Crawling/Automation -- Blocking, Login, and CAPTCHA Response
A guide to the technical risks and quotation considerations you must be aware of when outsourcing crawling and business automation development.
- •Crawling difficulty and cost vary significantly depending on the target site's blocking policies.
- •Login-required crawling, CAPTCHA bypass, and dynamic pages (SPA) each increase effort by 2-3x.
- •Legal risks (data protection laws, terms of service) must be verified in advance.
Crawling Difficulty Classification
| Difficulty | Target | Estimated Effort | Cost Range |
|---|---|---|---|
| Easy | Static HTML, public data | 1-3 days | $400-$1,200 |
| Moderate | Dynamic pages (JS rendering) | 3-7 days | $1,200-$3,200 |
| Difficult | Login required, rate limits | 5-14 days | $2,400-$6,500 |
| Very Difficult | CAPTCHA, IP blocking, anti-bot | 2-4+ weeks | $4,000-$12,000+ |
Without analyzing the target site in advance, quotations can be off by 2-5x.
Risk Factors That Drive Costs
1. IP Blocking
High-volume requests trigger IP blocks. A proxy pool and IP rotation are needed, adding infrastructure costs.
2. CAPTCHA
When reCAPTCHA, hCaptcha, or similar systems are in place, a CAPTCHA-solving service integration is required (recurring monthly cost).
3. Login/Session Management
Pages requiring login significantly increase complexity due to session persistence, cookie management, and 2FA handling.
4. Dynamic Rendering (SPA)
Sites built with React/Vue require browser automation tools like Puppeteer or Playwright.
5. Structural Change Response
When the target site changes its HTML structure, the crawler stops working. Maintenance contracts should include "structural change response" provisions.
6. Data Cleansing
The effort to cleanse raw data (parsing/cleaning/normalization) can be equal to or greater than the collection effort itself.
Crawling Requirements Checklist
Legal Considerations
Crawling may raise legal issues even when technically feasible.
Items to verify:
The target site's robots.txt policy
Terms of service clauses prohibiting automated collection
Data protection laws (when collecting personal information)
Copyright law (when reproducing content without authorization)
Telecommunications laws (when interfering with service operations)
Collecting publicly available data for personal use is generally permitted, but commercial use or large-scale collection requires legal review.
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