Thursday, 6 p.m. The Monday client report still has an empty AI tab, and the account manager wants ChatGPT, Gemini and Perplexity mentions for twelve brands. You open a monitoring tool’s pricing page and see seats. Per client. That math breaks fast. So you start looking for an AI visibility API for SEO agencies instead: structured answers with citations, a feed into Looker Studio or a Google Sheet, and AI search visibility tracking across ChatGPT, Perplexity and Google AI Overviews under your own branding. I went through the documentation of the options I could find. I judged them on platform coverage, citation data, integration paths and cost at agency volume.
Quick orientation before the detail:
| Provider | Best for | Pricing tier |
| DataForSEO | Solo consultants, agencies, growth teams | mid-range |
| cloro | Teams pulling AI engine answers by API | mid-range |
| Bright Data | Large-scale web data collection needs | premium |
| MentionsAPI | Brand-mention focused monitoring via API | mid-range |
| Sellm | Purpose-built AI search visibility tracking | mid-range |
Filtering by Docs and Billing
I started from documentation, not marketing pages. A candidate stayed only if its docs showed which AI engines it covered for LLM brand monitoring, whether answers came back as structured data with citations rather than raw HTML, and whether the output could feed a client portal or SaaS dashboard without a middleman. That narrowed the field.
Billing model was the second filter. Seat-based or per-client charges punish an agency with a long client list, so I read how each vendor charges and where the cost grows. Integration options mattered too: connectors, no-code automation support, and any route for an analyst to query the data directly.
I also read user reviews on Trustpilot and G2, scanning for recurring complaints about reliability, support and onboarding friction. Everything here rests on public documentation and published reviews. No tool was stress-tested.
1. DataForSEO
Agencies that would rather build AI visibility reports from raw data than rent a dashboard get the most room to work here, because the AI Optimization API splits into four feeds: LLM Mentions for brand mentions and citations in ChatGPT and Google AI Overviews, LLM Scraper for ChatGPT and Gemini answers as a user sees them on screen, LLM Responses for custom prompts sent to ChatGPT, Claude, Gemini and Perplexity through a single interface, and AI Keyword Data for AI search volume with a 12-month trend.
DataForSEO works as an AI visibility API for SEO agencies that track many client brands, handing back raw structured output that drops into Google Sheets, n8n, Make, Zapier or Airtable and renders under the agency’s own branding, with an MCP server for Claude and ChatGPT on top. Trustpilot shows 4.5/5 from 67 reviews. One Trustpilot reviewer described building a dedicated web app on the API to watch keyword positions across websites, found the docs easy to follow, and liked checking usage and errors in the DataForSEO panel.
There is no monthly plan to outgrow: the bill follows the prompts and brands you query, not seats or client accounts, and SERP, keyword and backlink data come from the same account.
Best suited for: SEO and GEO agencies, solo consultants and growth teams with API skills, reporting one brand or many in their own dashboards.
2. cloro
cloro sells API access to what AI engines say about a brand, so the answers land in your own pipeline rather than behind a login. That fits agencies already piping data into Google Sheets or an internal client portal.
The product is built around the answer data itself, which keeps the integration story short. Teams weighing it against broader data platforms are choosing focus over range. Whether each answer also arrives with its citations is worth confirming in the documentation before a report template depends on it. cloro suits a team that wants the answers and will handle the reporting layer itself.
Best suited for: mid-sized agencies that want AI engine answers delivered through an API into their own reporting.
3. Bright Data
On G2, Bright Data is rated 4.7/5 from 339 reviews.
The company comes from web data infrastructure: proxy networks, a Web Scraper API and a SERP API. That heritage pays off when AI answer collection is one workload among many, because a single vendor can cover price monitoring, SERP collection and AI engine outputs. Enterprise-minded buyers get depth.
Agencies that only need AI visibility reports may find a premium-tier platform of this breadth more than the job requires. Teams already running large collection pipelines feel the opposite.
Best suited for: larger agencies and in-house teams already collecting web data at scale across several use cases.
4. MentionsAPI
Brand mentions are the whole pitch at MentionsAPI, and the name says so. For an agency whose client reports hinge on one question, whether and where a brand gets named in AI-generated answers, a focused mentions API is easier to reason about than a broad data platform.
It is a narrow tool by design. Agencies that also need AI search volume or classic SERP data should check whether it covers them or whether a second source joins the stack. The documentation is the place to confirm if citations arrive alongside each mention, since that decides how much a client report can say.
Best suited for: agencies whose client reports center on brand mentions in AI answers, nothing broader.
5. Sellm
Sellm’s product is an AI search visibility tracker: it reports where a brand appears when people ask AI engines about its category. That suits agencies that prefer a tool built for one job over a general data platform.
Raw-data flexibility is the thing to test. The way output reaches client dashboards decides how much reshaping your team does, so check the documentation for export and integration routes before it goes into a reporting stack. A tracker with a clear single purpose can be the faster route for a small roster.
Best suited for: agencies wanting a purpose-built AI search visibility tracker for a modest client roster.
Which Data Source Fits Your Client Roster
Three situations cover most agencies, and each points somewhere different.
If your team already runs web data collection at scale and wants AI answers inside that same infrastructure, weigh Bright Data.
If you want one account covering AI answers plus SERP, keyword and backlink data, with every client report rendered in your own Google Sheets or portal, weigh DataForSEO.
If you want a narrower API aimed at AI answers and mentions, weigh cloro, MentionsAPI and Sellm side by side. Push the same ten client prompts through each trial, then check whether citations come back inside the response.
Before you sign anything, count your clients, multiply by prompts, and ask what the invoice looks like at that number. Then ask who on your team will wire the output into the report your clients actually open.