Choosing an AEO agency comes down to one test: make them show you, live, a client being cited in ChatGPT, Perplexity, or Google AI Overviews. Not a screenshot, not a case study PDF, a live query on a call. Then check that their reporting tracks citations and share of voice rather than keyword rankings, and that their timeline claims match how AI engines actually refresh. That filter eliminates most of the market, because the AEO industry in 2026 has a pretender problem: traditional SEO agencies that rebranded overnight with new landing pages and the same old playbook.
This post gives you the full vetting framework: the red flags, the five questions, the pricing sanity checks, and the contract structure that protects your firm if you choose wrong.
Why the AEO agency market is full of pretenders
The demand showed up faster than the expertise. AI referral traffic is still small in volume, around 1 percent of total web traffic, but it is growing at 340 percent year over year, and it converts like nothing else. A 12-month GA4 analysis of 94 brands found ChatGPT referral traffic converting at 1.81 percent against 1.39 percent for non-branded organic, a 31 percent gap. Similarweb clickstream data from spring 2026 is more dramatic: ChatGPT referrals converted at 7.1 percent, second only to paid search at 7.8 percent and ahead of organic, direct, email, and social. Other studies put AI-referred visitors at 4.4 times the conversion rate of standard organic traffic.
Numbers like that pull every marketing agency in the country toward the word “AEO.” Most of them changed their pitch deck and nothing else. For law firms the stakes are higher than average, because legal queries trigger AI answers at the highest rate of any industry, and because legal client values mean one missed quarter of visibility is real money.
The structural problem to understand before any sales call: a large legacy SEO firm that sells AEO as an add-on has its overhead built around link building and high-volume blogging. It cannot pivot without breaking its own business model. If you hire one, your AEO budget quietly funds traditional SEO deliverables with new labels.
The five questions that expose a fake AEO agency
Ask these in order on the first call. Strong agencies enjoy them. Weak ones improvise.
1. “Show me a client being cited, live, right now.”
The single highest-signal request in the vetting process. A real AEO agency can open ChatGPT or Perplexity on a screen share, run a buyer-intent query, and show a client’s name in the answer. An agency that offers a PDF instead is showing you marketing, not proof. This one request will cut your shortlist in half.
2. “Which AI platforms do you track, and how does each one pick citations?”
The minimum acceptable answer names ChatGPT, Perplexity, Claude, and Google AI Overviews. Stronger agencies also cover Gemini and Microsoft Copilot. Then probe the second half: each engine retrieves differently. ChatGPT leans on Bing’s index and brand mentions, Perplexity reranks its own live index, Google’s surfaces follow the organic index, and Gemini grounds local answers in Google Maps. An agency that cannot explain those differences without preparation does not have platform-specific process, and platform-specific process is the entire job.
3. “What exactly is in your monthly report?”
The right answer: citation rate, mention rate, average position within AI answers, and share of voice against named competitor firms. The red flag answer: organic traffic and keyword rankings. Traffic is a byproduct of AEO, not proof of it. A case study that says “organic traffic up 40 percent” with no citation data is a traditional SEO case study wearing a costume. Ask to see a sample report before signing anything.
4. “How long until we see results, and in which engine first?”
The honest answer has structure: schema and entity fixes can show movement in two to four weeks after reindexing, first citation movement lands around 60 to 90 days, and meaningful share of voice growth takes three to six months. Perplexity moves first, ChatGPT lags by weeks, Google follows the organic index. An agency promising AI dominance in 30 days is overselling; one quoting 12 months before any signal is underbuilding. Cross-check their claims against the actual engine-by-engine timeline.
5. “Where does the budget go?”
When a vendor quotes a five-figure monthly retainer “for AEO” but cannot break down how much goes to content, technical work, tracking, and reporting, walk. The same applies to vague scope language: if the answer to “what will you actually do” stays at the level of “we make sure your content works for AI,” you are hearing marketing language papering over the absence of process.
Red flags that end the conversation
A few patterns justify walking immediately, whatever else sounds good.
The rebranded package. The agency pitches link building, technical fixes, and blog content as their complete AEO strategy. That is an SEO retainer with a new name. Real AEO work includes entity and schema buildout, citation tracking infrastructure, answer-first content restructuring, review and directory signal work, and press placements that create the third-party mentions engines weight.
Guaranteed citations. No one controls what an AI engine says. Agencies can move probability, not guarantee outcomes. A guarantee in the pitch means the agency either does not understand the system or assumes you do not.
No legal vertical experience. Law firm AEO has its own terrain: bar advertising rules, Avvo and Martindale signal weight, jurisdiction-specific content requirements, YMYL trust thresholds. An agency that has never worked legal will spend your first three months learning it on your budget.
Tool-only delivery. Some agencies resell a dashboard subscription with a markup and call it a program. Visibility tracking tools like Searchable or Peec are inputs to the work, not the work.
What a fair engagement looks like
Pricing first. Specialist law firm AEO retainers in 2026 cluster between $2,000 and $6,000 per month depending on market and practice area competitiveness, with full-stack programs that include PR running higher. The full breakdown is in our AEO cost post. Below roughly $1,500 a month, real platform-specific work is not economical to deliver; far above $10,000, demand the line-item budget from question five.
Structure second. Start with an 8 to 12 week trial or a fixed-scope pilot instead of a 12-month contract. The deliverables of a competent first quarter are concrete: baseline citation snapshot across engines, schema and entity buildout, the first batch of restructured content, and a report showing movement in at least one engine (Perplexity, if the work is sound). Put a no-penalty exit after the trial in writing. Agencies confident in their process accept this readily. Agencies that need twelve guaranteed months to show anything are telling you what their first three look like.
Measurement third. Before signing, agree on the query panel: 20 to 30 buyer-intent questions for your practice areas and cities that both sides will track monthly. This kills ambiguity later. Either your firm shows up in more of those answers over two quarters or it does not.
FAQ: hiring an AEO agency
Should my law firm just have its current SEO agency add AEO?
Only if they pass the same five questions a new vendor would. Some SEO shops have built real AEO capability; most have built a slide. The live demo test applies regardless of how long you have worked together.
Can we do AEO in-house instead?
The foundations, yes: Business Profile hygiene, FAQ content, schema, review workflows. The 2026 AEO checklist covers what a motivated marketing coordinator can ship. Where agencies earn their fee is press placement networks, citation tracking infrastructure, and engine-specific content systems running at volume.
How do we verify an agency’s case studies are real?
Ask for the live demo on the case study client, or ask for a reference call where you run the queries yourself. Citation claims are checkable in 30 seconds, which is exactly why honest agencies do not mind.
What if we hire wrong?
The trial structure is the insurance. The losses from a bad AEO agency are mostly opportunity cost, and an 8 to 12 week pilot caps it at one quarter. The baseline snapshot from week one also transfers: whoever you hire next starts from data, not zero.
The bottom line
Vetting an AEO agency takes one call and five questions, and the live citation demo does most of the work. Firms get burned when they buy the pitch instead of the proof. If you want to see how we answer these questions, book a call and ask us all five, live demo included. Or start with the free GSC analysis and see your current AI visibility baseline before talking to anyone.
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