Short answer: a GEO agency works so that your company appears, is described correctly and is cited in the answers of ChatGPT, Gemini, Claude, Perplexity or Google AI Overviews. It does that by measuring what AI answers to the buying questions in your category, fixing what depends on your website and your sources, and measuring again. In Spain you will find closed diagnoses under €200, fixed-scope projects of a few hundred to a few thousand euros and monthly retainers from several hundred euros upwards. What separates a good agency from a bad one is not the price: it is whether you can see the original answer, the date and the source behind every figure, and whether it promises something nobody controls.
What you buy when you buy GEO
Behind the acronym there are four concrete jobs. When you evaluate a proposal, look for all four:
- Question research. What people ask AI before buying in your category: discovery, comparison, decision. Without this, everything else is guessing.
- Measurement. Running those questions on the agreed platforms and saving every answer with date, brands mentioned, order and sources. With competitors. Repeatable.
- Changes to what you control. Crawling and indexing, missing pages (pricing, FAQ, comparisons), content that answers, a coherent entity everywhere, truthful structured data.
- Measuring again. The same questions, on a later date, compared one by one with the baseline. Without this you will never know whether the work helped.
Some agencies add a fifth: earning mentions in external sources (media, directories, communities). Legitimate when done with a real identity and disclosure. A risk when it means buying reviews, votes or undisclosed links.
What no agency can do
No agency controls an AI's answers. It cannot guarantee that ChatGPT will mention you, nor a position, nor that today's answer will hold tomorrow. It cannot prove that a specific page caused a mention either: it can observe that they coincide in time, which is not the same thing.
If a proposal says "we will get you into ChatGPT in 30 days" or "we guarantee recommendations", ask how it is measured and what happens if it does not occur. You will usually find the guarantee covers delivered work, not outcomes, or that it does not exist.
What it costs in Spain
| Model | What it usually includes | When it makes sense |
|---|---|---|
| Closed diagnosis or audit, one-time | Agreed questions, measurements on two or three platforms, competitors, a report and priorities | To know where you stand before spending on implementation |
| Fixed-scope project (sprint), one-time | Diagnosis plus concrete website changes and a final measurement | To act with a known scope and date |
| Monthly retainer | Periodic measurements, content, competitor tracking, reports and meetings | Once you know what works and want to keep the pace |
Monthly retainers of GEO agencies in Spain usually start at several hundred euros and exceed a thousand at established agencies or those with broad execution. Many offer a "free audit" that is, in practice, a sales door: useful as a first orientation, not as a full diagnosis. Our scale, for comparison: a free three-question review, an AI diagnosis for €149, a visibility sprint for €690 and a monthly partnership from €590, all excluding VAT and with no minimum term.
What really drives cost is not the platform: it is the senior time needed to turn volatile answers into a plan your team can execute.
What a proposal must include
In writing: which questions will be measured and how they were chosen; platforms, market and language; how many observations and on how many dates; which competitors; what you receive (report, full matrix, original answers, sources, export); which website changes will be made and who approves them; when it will be measured again; what is guaranteed (scope, delivery) and what is not (mentions, rankings, traffic, sales); total price, taxes, timing and cancellation terms.
If half of that list is missing, it is not a proposal. It is bait.
Ten questions to ask any GEO agency
- Can I see the original answer, the date and the source behind each figure in the report?
- How do you choose the questions and how do you keep my brand name out of them?
- How many times do you measure and how do you show what changed between rounds?
- Do you separate being mentioned, being recommended and being cited?
- What exactly does each metric mean and what is its denominator?
- Which part of the work depends on me and which on third parties?
- How do you treat errors, empty answers and platform changes?
- Can I export my data and take it with me if I leave?
- What do you not guarantee?
- Do you buy reviews, mentions or links? Under which identity do you publish?
A serious agency answers all ten without discomfort. If the answer to the first is "we have a proprietary score", you already know enough.
An SEO agency with GEO, or a 100% GEO agency
Many SEO agencies have added GEO to their catalogue. That is not bad: crawling and indexing fundamentals are shared. The practical difference lies in two things. First, the yardstick: an SEO agency shows you rankings and traffic; a GEO agency shows you what AI answered before and after. Second, what it has to defend: whoever lives off a link-building retainer or mass content tends to recommend more of the same.
We only do GEO, which is why our offer starts small: a free review, a €149 diagnosis and a two-week sprint. There is nothing to defend except the measurement.
How to choose, in three steps
- Measure first yourself. Twenty minutes with six unbranded questions give you a real starting point and let you check whether the agency's diagnosis matches what you saw.
- Ask for the smallest diagnosis they offer, with closed scope and price. Evaluate the deliverable: original answers, sources, priorities with an owner.
- Decide with the report in hand. If the diagnosis lets you make decisions without them, that is a good sign to continue with them.
Next step
The free review looks at three questions in your category on two platforms and tells you by email what we saw and what we would do first. It is the cheapest way to check whether this makes sense for your company.