For massive sites, leverage Indexing APIs for automated, high-volume...

https://www.4shared.com/office/mg3w3V-sge/pdf-29834-5493.html

For massive sites, leverage Indexing APIs for automated, high-volume submissions. For niche link-building campaigns, manual submission or specialized tools—often verifying status in under two minutes—work best. Avoid relying solely on these tools, however