Marginalia: free-ish for non-commercial use https://about.marginalia-search.com/article/api/

Brave: free for first 1000/mth, 0.5c per search https://brave.com/search/api/

Mojeek: £0.001 - £0.003 (0.1p - 0.3p) per search https://www.mojeek.com/services/search/web-search-api/

Kagi: 2.5c per search https://help.kagi.com/kagi/api/search.html

https://programmablesearchengine.googleblog.com/2026/01/upda...

(Looks like the sentence following the suggestion addresses this somewhat.)

ps. Modern AI is in reality talking web search engine imo.