Dev.to
7/3/2026

The original title is "Anatomy of an API scrape: reading 251 requests like a crime scene"
Original: Anatomy of an API scrape: reading 251 requests like a crime scene
Short summary
An API scraper left 251 requests trying to copy a visa database—taking only 0.6% before being blocked. The attacker's timing patterns (25 req/min), parameter choices (throwaway email, test calls), and request sequencing revealed systematic extraction. The lesson: data-product teams must instrument logging and rate-limiting on day one, because these are security boundaries, not just cost controls.
- •Attacker scraped 0.6% of a visa API database (249 of 39,585 pairs) in 251 requests before being blocked
- •Forensic patterns revealed methodology: passport-by-passport sweep, 2.4-second intervals, throwaway email, test calls—a feasibility check, not a full dump
- •Key lesson: rate limits and IP logging are security controls, not just usage limits; teams must instrument these on day one
Generated with AI, which can make mistakes.
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