For manual, high-intent pages, Google’s Indexing API remains the gold standard....

https://www.ranktracker.com/blog/best-website-indexing-tools-for-seo/

For manual, high-intent pages, Google’s Indexing API remains the gold standard. When managing mass-scale link campaigns, third-party indexers often provide the necessary lift, with some services costing around $29 for 60 credits