An Instant Answer API exist. The fucking manual has gone and I don't know why it still exist. Probably because someone still use them and Duckduckgo just simply can't let it go.
https://api.duckduckgo.com/?q={QUERY}&format=json
- https://stackoverflow.com/questions/37012469/duckduckgo-api-getting-search-results
- https://stackoverflow.com/questions/11722465/duckduckgo-api-not-returning-results
- Use HTML page and get it by a crawler.
- Bing API since they use Bing API as their result? https://news.ycombinator.com/item?id=21725906https://help.duckduckgo.com/results/sources