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Dev.to
7/20/2026
How I scraped betting odds from 9 countries using hidden public APIs

How I scraped betting odds from 9 countries using hidden public APIs

Original: I scraped live betting odds from 9 countries and never once hit a real anti-bot wall

Short summary

A developer built a horse-racing odds tracker across 9 countries without paid proxies or headless browsers by finding public APIs hidden in plain sight. Key techniques include checking for server-side rendering, extracting __NEXT_DATA__ and JSON-LD blobs, and discovering GraphQL endpoints with embedded API keys in frontend JS. The article includes practical code snippets and lessons on quiet data failure modes.

  • •Scraped 9 countries' betting odds with zero CAPTCHAs or paid proxies by finding hidden public APIs
  • •Covers __NEXT_DATA__ extraction, brace-counting JSON parsing, and GraphQL introspection from frontend JS
  • •Includes real debugging lessons like silent fallback data causing country mislabeling

Generated with AI, which can make mistakes.

#ai-tools#open-source
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