What is the current good indexing service for 100-500K links

What is the current good indexing service for 100-500K links or say 50 k links a day

what you will do this with so much indexing

GSASER build links and index

How this works?

50k links a day with current working indexing services, considering they can easily range between $0.01 - $0.50 per link, would cost you upwards of $500 per day before discounts. I'd recommend you go through those links with some serious filters to work out whether they're worth indexing in the first place. For example, you're talking about GSA links, and the majority of GSA links from a full engine blast will be useless 'indexer' and 'url shortner' links which are never going to index and serve only to bulk out reports. Sending those to any indexing service would be a waste of your time and money. Filter down to the link types that stand a chance of providing benefit, ie anything contextual and/or allowing 200+ words of unique content posted.

You can go with GSA SEO indexer for bulk link submission it's Software-based, integrates with GSA Search Engine Ranker
There is no recurring fees for this its One-time purchase.

7th Sense said:

You can go with GSA SEO indexer for bulk link submission it's Software-based, integrates with GSA Search Engine Ranker
There is no recurring fees for this its One-time purchase.

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hate to say it, but GSA SEO indexer isnt going to index anything nowadays. OP, speed-links is still working to a point for bulk, but much lower success rate than it used to be