BLEXbot and DataForSeoBot: What They Are and Why They Matter
Key takeaways
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After Googlebot, Bingbot, and the big four SEO platforms, server logs get into the long tail. BLEXBot and DataForSeoBot live there. Neither is large enough to be a problem on its own. Both are common enough that you'll eventually ask what they are.
Short version: they're SEO-data crawlers for tools your buyers have never heard of, they behave well, and most B2B sites can block them without a second thought.
What is BLEXBot?
BLEXBot is the web crawler operated by WebMeUp, a backlink index provider. Its data powers SEO SpyGlass, the backlink analysis tool inside SEO PowerSuite, a desktop SEO software bundle. It identifies as BLEXBot in the user agent string and links to webmeup.com for documentation. |
WebMeUp is the smallest link index of the crawlers in this cluster. Its primary customer is Link-Assistant.com, the company behind SEO PowerSuite, a desktop toolkit popular with freelancers and small agencies. If you've never heard of it, that's normal in enterprise B2B marketing, where Semrush and Ahrefs dominate.
BLEXBot crawls the way MJ12bot and DotBot do, following links to build a graph. Its request volume is usually modest. It's rarely a performance concern. It's simply another crawler taking your content to a database you're not a customer of.
What is DataForSeoBot?
DataForSeoBot is the web crawler operated by DataForSEO, a company that sells SEO datasets and SERP data through APIs. Rather than a consumer-facing tool, DataForSEO supplies the data behind other companies' SEO software. Its crawler builds backlink and on-page datasets that those customers query. It identifies as DataForSeoBot. |
DataForSEO is a wholesaler. Dozens of SEO tools, rank trackers, and marketing dashboards buy their backlink and SERP data from DataForSEO's API rather than running their own crawlers. So when DataForSeoBot crawls your site, the data can surface in any number of downstream tools, none of which you can identify from the log line.
That makes the "do I use this tool" test harder to apply. You might be using a product built on DataForSEO without knowing it. In practice, the crawl footprint is small enough that this rarely matters. DataForSEO's SERP API, the product most marketing teams would encounter, works by querying search engines, not by crawling your site.
Do BLEXBot and DataForSeoBot respect robots.txt?
Yes, both. WebMeUp and DataForSEO each document that their crawlers honor robots.txt Disallow directives and the Crawl-delay directive. A named Disallow block is sufficient for either. Neither requires a network-edge rule. |
Both operators publish crawler pages explaining what the bot does and how to stop it, which is the baseline I hold every crawler to in the bad bots hub. They pass. Bytespider doesn't.
Should you block BLEXBot and DataForSeoBot?
For most B2B technology brands, yes. Neither feeds a tool your team is likely to use, neither affects search or AI visibility, and both consume crawl resources. Keep BLEXBot only if you use SEO PowerSuite. Keep DataForSeoBot only if you know your rank tracker or SEO dashboard is built on DataForSEO's backlink API. |
I block both on mqlmagnet.com. The reasoning is the same as for PetalBot. Legitimate operator, polite behavior, zero return for my market.
The one nuance is the wholesale model. If your team uses a niche SEO dashboard or an agency reporting tool and you're not sure where its backlink data comes from, ask the vendor before blocking DataForSeoBot. Most will tell you. If they say DataForSEO, allow it and move on. If they say Semrush or Ahrefs, which is more common, block it.
Keep in mind how small this decision is in the overall picture. Imperva's 2025 Bad Bot Report put automated traffic at 51% of all web traffic in 2024. BLEXBot and DataForSeoBot together are a fraction of a percent of that on any given site. The point of blocking them is tidiness and a cleaner log, not performance.
How do you block BLEXBot and DataForSeoBot?
Add both user agents to a named block in robots.txt: User-agent: BLEXBot, User-agent: DataForSeoBot, then Disallow: /. Keep the block separate from your User-agent: * group. Publish, verify at yourdomain.com/robots.txt, and check logs after a week. |
User-agent: BLEXBot
User-agent: DataForSeoBot
Disallow: /
Or fold them into the larger stacked block with the rest of the SEO-data crawlers. The complete paste-ready version for Wix is in the Wix walkthrough. No Cloudflare rule needed for either.
Do BLEXBot or DataForSeoBot affect AI visibility?
No. Both feed SEO datasets and nothing else. Neither has any relationship with Google, Bing, OpenAI, Anthropic, or Perplexity. Blocking them has no effect on rankings, AI Overviews, or citations in any generative engine. |
They sit outside the Engine Optimization Matrix, like every other measurement crawler in this cluster. The bots that occupy the matrix's Distribution cells are the ones in the AI crawlers overview, and the argument for keeping them is in the GPTBot and ClaudeBot posts.
If you've got a long-tail user agent in your logs that isn't covered anywhere in this cluster, the server log analysis guide has the identification process, or book 30 minutes and I'll look at it with you.
About the author
Harold Bell is Founder and CEO of MQL Magnet, a B2B content marketing agency serving enterprise technology brands. He's the creator of the Engine Optimization Matrix (EOM), author of Partner Over Product, and a Forbes Communications Council member.
Frequently asked questions
What is BLEXBot?
BLEXBot is the web crawler operated by WebMeUp. It builds the backlink index behind SEO SpyGlass, part of the SEO PowerSuite desktop toolkit.
What is DataForSeoBot?
DataForSeoBot is the web crawler operated by DataForSEO, a company that sells SEO datasets through APIs to other software vendors. It builds backlink and on-page data those customers query.
Does BLEXBot obey robots.txt?
Yes. WebMeUp documents that BLEXBot honors Disallow and Crawl-delay directives.
Does DataForSeoBot obey robots.txt?
Yes. DataForSEO documents that its crawler honors Disallow and Crawl-delay directives.
Should I block BLEXBot?
Yes, unless you use SEO PowerSuite. It has no effect on search or AI visibility and its data feeds a tool most enterprise B2B teams don't use.
Should I block DataForSeoBot?
Yes, unless you know your rank tracker or SEO dashboard is built on DataForSEO's backlink API. Ask your vendor if unsure.
How do I block BLEXBot and DataForSeoBot?
Add both user agents to a named block in robots.txt above a single Disallow: /. Keep it separate from your User-agent: * group.
Do these bots affect Google rankings?
No. Neither has any connection to Google, Bing, or any AI engine.
Are BLEXBot and DataForSeoBot malicious?
No. Both are documented, robots.txt-compliant commercial crawlers. They're low-value for most B2B sites, not malicious.
Why does DataForSEO crawl my site if I don't use it?
DataForSEO is a data wholesaler. Its crawler builds datasets that many third-party SEO tools purchase via API, so your site is crawled for those tools' customers regardless of whether you use any of them.
