For high-velocity link building, API-based services (typically around $29 for...

https://stateofseo.com/what-is-feed-injection-and-why-does-it-matter-for-indexing-tools/

For high-velocity link building, API-based services (typically around $29 for 60 credits) help surface URLs faster. However, for core site content, stick to optimized XML sitemaps and improved internal linking