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Stock MCP server for Claude, ChatGPT and more

The calculated fair value for your AI, instead of a guessed number

Ask an AI what a stock is worth and it estimates. With Fair Value Calculator it fetches the answer from us: calculated daily, for 40,000+ stocks worldwide.

Connect Claude Connect ChatGPT Another assistant

Free. An account is enough, no card.

More than 3 full verdicts a day? Pro works in your AI too: Try Pro: first month $1 · Free and Pro

40,000+stocks worldwide
26valuation models per stock
69criteria per stock
Dailyrecalculated

Why this makes a difference

Without the connection

The AI answers from memory. Its fair value is an estimate, and each time you ask you get a different number.

With Fair Value Calculator

The AI fetches the current valuation and names the source. The same number as on our site, calculated from 26 models and audited financials.

What an answer looks like

Is Apple over- or undervalued right now?
According to Fair Value Calculator, Apple's fair value is $391.90 per share. The range runs from $240.87 (cautious) to $509.46 (optimistic). The stock counts as near fair value (distance in 10-point bands: upside 10 to 20%). Quality: 83 out of 100.Uptrend: one month ago the price was 25.3% higher than twelve months ago.Buy rules of the strategy: met quality score of at least 50 and uptrend, not met fair value upside of at least 30%.Main risk: Ongoing antitrust actions in the EU, China and elsewhere could force lower App Store fees or alternative stores and payments, hitting high-margin services revenue.Full analysis: fairvalue-calculator.com/stock/AAPL.US Today's fields exactly as the connection delivers them. It does not deliver the share price. The wording comes from the AI. Not investment advice.

In three steps

Pick your AI assistantClaude, ChatGPT, Perplexity, Mistral Vibe (Le Chat), Google Gemini, Claude Code, Cursor, VS Code or Codex. Each has its own short guide.
Sign in onceWith your Fair Value Calculator account. A free one is enough, you confirm with one click.
Just askThe AI recognises by itself when it needs Fair Value Calculator and names it as the source.

Connect your AI assistant

Claude In the Claude directory, one click Guide → ChatGPT In a browser on a computer, about 2 minutes Guide → Perplexity In a browser on a computer, about 2 minutes Guide → Mistral Vibe (Le Chat) In a browser on a computer, about 2 minutes Guide → Google Gemini In a browser on a computer, about 2 minutes Guide → Claude Code One command, then sign in Guide → Cursor One click, then sign in Guide → VS Code One click, then sign in Guide → Codex One command, then sign in Guide →
Another program with MCP? Enter this server URL and sign in with your account. https://www.fairvalue-calculator.com/mcp

Portfolio at Scalable Capital or Interactive Brokers? Check it in Claude like this →

Also listed in the official MCP Registry (entry com.fairvalue-calculator/fair-value). The server description is public on GitHub.

What you can ask

Is Apple over- or undervalued right now?
Compare Microsoft, Alphabet and Meta by fair value and quality.
Which European tech stocks are undervalued with high quality?
Which US software stocks are undervalued and in an uptrend?
Which Swiss stocks meet all three buy rules right now?
What is Nestlé worth, and what is the main risk?
Which stock on my watchlist is overvalued by now?
Put Microsoft and Alphabet on my watchlist and turn the alert on.

One workflow, four sentences

From the first question to the alert, without opening the website. Tap a sentence to copy it.

Check a stockFree
Fair value with its range, verdict, distance in 10-point bands, quality, trend and the three buy rules in one answer.
Compare with alternativesFree
The same values side by side. You see which stock looks better right now.
Put it on your watchlistFree
One sentence is enough. The stock then also shows in your watchlist on the website.
Have it monitoredPro
You get an email when one of your stocks changes from On track to Review.

Eleven functions, explained exactly

You do not need to know any of them. You ask in your own words and your AI picks the right function.

Ask for valuations

Find a stockFree
A name, ticker or ISIN becomes the right listing, in the same order as the search on the site. Up to five matches. You ask: „Find Siemens."
Fair value verdictFree
The fair value per share with its currency and its range (cautious to optimistic), the verdict (under-, fairly or overvalued), the distance to fair value in 10-point bands, the quality score, the data level, the uptrend and the three buy rules of the strategy (fair value, quality, uptrend). Plus the reasoning: strengths and weak points, the AI conclusion and the main risk, with the link to the full analysis. You ask: „What is Apple worth?"
Quick snapshotFree
Verdict, distance in 10-point bands and quality of one stock, without the fair value as a number. For a quick look at many stocks. You ask: „Is Nestlé roughly expensive or cheap?"
Screen for undervalued stocksFree
Stocks that match your criteria right now: minimum distance to fair value, minimum quality, sector or industry (for example technology, semiconductors, banks, insurance or gold), region or country (US, Europe, UK and 27 more countries such as Germany, Switzerland, Canada, Hong Kong or India), only in an uptrend or exactly the stocks with all three buy rules of the strategy. Sorted by quality, with the buy rules like the strategy. You ask: „Which European tech stocks are undervalued?"
Compare stocksFree
Several stocks side by side with the same values. Free: 2 stocks as snapshots, with Pro up to 5 with fair value. You ask: „Compare Microsoft, Alphabet and Meta."
Check a portfolioFree
Your whole portfolio in one request: every holding with verdict, distance in 10-point bands, quality and the three buy rules, plus the share below, near and above fair value (by weight when you give shares of the portfolio, values or numbers of shares), the median distance, the largest positions and sectors and which holdings are overvalued. Free: 10 different holdings a day as snapshots, the largest first; with Pro up to 50 holdings per request with fair value. Also works with the holdings from a connected broker account, for example Scalable Capital or Interactive Brokers. You ask: „Check my portfolio with the Fair Value Calculator: Apple 20%, SAP 15%, Allianz 10%, Novo Nordisk 8%."

Your watchlist and your alert

These functions work on your account. Your AI only changes something when you explicitly ask for it, and tells you afterwards what it did. You agree to this separately when connecting.

Show my watchlistFree
Your saved watchlist with today's verdict, distance in 10-point bands and quality of each stock, plus whether your email alert is on. With Pro each stock also says whether it is on track or should be reviewed. You ask: „How does my watchlist look right now?"
Add stocks to the watchlistFree
Adds up to 10 stocks per request to your watchlist. What is already on it stays unchanged. From then on the alert and the weekly briefing follow these stocks. For each added stock the answer says which of the three buy rules it meets. You ask: „Put Coca-Cola and PepsiCo on my watchlist."
Remove stocks from the watchlistFree
Removes up to 10 stocks per request from your watchlist. The previous list is kept on our side as a backup. You ask: „Take Intel off my watchlist."
Turn the email alert on or offPro
Turns the email alert for your whole watchlist on or off. The alert comes when one of your stocks changes from On track to Review: the price has reached the optimistic fair value, the Quality Score has fallen below 50 (the minimum of the buy rule) or the stock has been on it for five years. There are no price-target alerts. You ask: „Turn on my watchlist alert."
Stocks that fit my portfolioPro
Suggests up to 8 stocks that fit your watchlist: below their fair value, high quality, and ranked by their measured correlation with your stocks. On request as a replacement for one particular stock in a matching size, or aimed at a new country, a new sector or a different company size. The same optimizer as on the site. Free accounts can try it once every 30 days. You ask: „What would diversify my watchlist?"

Not available in ChatGPT yet: Check a portfolio, Stocks that fit my portfolio.

What an answer contains

Every field your AI gets from us, in one sentence. The full verdict carries all of them; snapshot, comparison, screen and watchlist carry verdict, distance, quality, evidence level, trend and buy rules. Not included are the share price, market capitalisation, single metrics and the values of the individual models: they are on the linked analysis page.

Fair valueThe calculated value per share, in the currency of the listing, from up to 26 valuation models.
RangeThe cautious and the optimistic case of the fair value.
VerdictUndervalued, near fair value or overvalued. Undervalued means the price is at least 10% below fair value, overvalued at least 10% above it.
Distance in 10-point bandsHow far price and fair value are apart, in bands of ten percentage points (for example 10 to 20%). The connection does not deliver the exact percentage or the share price.
Quality ScoreThe quality of the business from 0 to 100.
Evidence levelHow much audited data backs the value: high, medium or low.
Twelve-month trendUptrend yes or no (the price one month ago was higher than twelve months ago), plus the change in percent and an arrow: up, sideways (a decline of up to 10%) or down.
Three buy rulesFor each rule of the strategy and for all three together: fair value upside of at least 30%, quality score of at least 50, uptrend. The strategy only buys stocks that meet all three.
ReasonsStrengths and weak points as keywords on growth, profitability, debt, cash flow and competitive advantage, each marked as a strength, to watch or a weakness.
AI conclusion and focusOne sentence on the quality of the business and one on what currently matters for the company, with the date of the note.
Main riskThe biggest risk to the business in one sentence.
Last change of the fair valueOnly when the fair value changed by 15% or more within the last 30 days: date, value before and after, and the reason (new fiscal-year figures, a peak or trough year of a cyclical business, new shares, or an updated calculation for all stocks).
Caution flagWhen the website shows the fair value with a caution badge, the answer says so too: capped (the models arrive at a very high value, the value shown is deliberately lower) or extreme value (the fair value sits far below the price, outside the range where the models are reliable).
EstimateWhen no valuation model carries, usually because of losses or heavy investment, the fair value is an estimate and less precise than a model-based value. The answer marks it, and the verdict is then never "undervalued".
As ofThe date of the share price the verdict refers to and the date the models last ran.
Other listingWhen we carry the stock you asked for under another listing of the same company, the answer says which listing the value and currency refer to.
Link to the analysisThe analysis page of the stock on our site: the fair value history and the result of each valuation model with its cautious, base and optimistic case.

Free and Pro

Per day and functionFreePro
Full verdicts with fair value350
Quick snapshots30300
Find a stockno limitno limit
Comparisons and screens (counted together with the AI chat on the website)550
Stocks per comparison25
Matches per screen320
Holdings per portfolio check10 different a day, without fair valueup to 50 per request, with fair value
Show the watchlist✓✓
Change the watchlistup to 10 stocks✓
Switch the email alertno✓
Suggestions for the watchlistonce every 30 days✓

With a free account each stock counts only once a day: asking again about the same stock does not use another verdict. Every answer says how many verdicts are left today.

One Pro for the site and your AI, no separate plan. Buy it with the account you connected your AI with: it applies right away, no need to reconnect. After the first month $9.90/month or $99/year, cancel any time.

Try Pro: first month $1 All about Pro

Your plan with us is what counts. A ChatGPT or Claude subscription does not change it.

What some of our 4,421 users say

★ 4.3 on Trustpilot →
  • Trustpilot ★★★★★
    “extensive data in format that is easy to understand”

    Martin Grovdahl, USAOct 2026

  • Trustpilot · translated ★★★★★
    “I appreciate the good overview and the wealth of metrics when you want to look at a stock more closely. The fair value estimate is sometimes more cautious than elsewhere, which I see as a positive. There is even personal contact: a human replies, not a bot. Very satisfied, and I recommend this portal.”

    Andreas J., SwitzerlandOct 2026

  • Trustpilot ★★★★★
    “This tool is great. I use it every time I want to buy a stock or study a stock. You get a valid calculation if you're buying an over- or undervalued stock. A perfect tool.”

    Samad Golzari, GermanyAug 2026

  • Email · translated
    “Impressive how quickly you implemented that. Thank you, that really helps me.”

    DanielAug 2026

  • Instagram
    “That was a super quick fix, Peter. Amazing. Your application is a gem for a beginner like me.”

    Hemant P., IndiaAug 2026

  • Forum
    “The interface is really well done, despite all the information it holds.”

    MatthesAug 2026

  • Forum
    “Cool tool, I hadn't come across it before. Impressive.”

    Lever H.Aug 2026

  • Forum
    “Even with a great deal of information available, it comes across as quite clear and easy to understand.”

    hattifnattJul 2026

Frequently asked

What is this exactly?

A stock MCP server: a connection between your AI assistant and Fair Value Calculator. When you ask your AI about a stock, it fetches the fair value, quality and verdict from us instead of estimating something itself.

How do I get stock fair values in Claude?

Open our listing in the Claude connector directory (https://claude.ai/directory/connectors/fair-value-calculator), click "Connect" and sign in with a free Fair Value Calculator account. Then ask Claude what a stock is worth, and Claude fetches the calculated fair value from our MCP server at https://www.fairvalue-calculator.com/mcp.

Can Claude value stocks?

Without a connection Claude answers from memory and estimates. With Fair Value Calculator as a connector (directory: https://claude.ai/directory/connectors/fair-value-calculator, server address https://www.fairvalue-calculator.com/mcp) Claude fetches the calculated fair value, the verdict and the Quality Score from us and names the source.

Which MCP servers give stock valuations?

Fair Value Calculator runs an MCP server at https://www.fairvalue-calculator.com/mcp: it returns the calculated fair value, the verdict and the Quality Score of 40,000+ stocks worldwide. It works in Claude, ChatGPT, Perplexity, Mistral Vibe (Le Chat), Google Gemini, Claude Code, Cursor, VS Code and Codex and in any other program with MCP; in Claude it is one click from the directory: https://claude.ai/directory/connectors/fair-value-calculator.

Is there a free stock MCP server?

Yes. The Fair Value Calculator MCP server (https://www.fairvalue-calculator.com/mcp) works with a free account and without a card. The free limits are 3 full verdicts and 30 quick snapshots a day. In Claude you add it from the connector directory: https://claude.ai/directory/connectors/fair-value-calculator.

What does it cost?

Nothing. A free account is enough and gives you 3 full verdicts a day. Pro raises the limit to 50 a day.

Is there a separate Pro plan for the AI?

No. It is the same Pro as on the website and covers both: the site and your AI. Buy it with the account you connected your AI with; it applies right away, no need to reconnect. First month $1, then $9.90/month or $99/year, cancel any time.

Does the AI compute the fair value itself?

No. It receives the number from us and explains it. The calculation runs on our side, daily, from 26 valuation models.

Which assistants work?

Claude, ChatGPT, Perplexity, Mistral Vibe (Le Chat), Google Gemini, Claude Code, Cursor, VS Code and Codex each have their own guide. Any other program with MCP works with the server URL.

What data goes to the AI?

Only the result for your question. No raw data and no model weights. Your AI sees your watchlist only if you allow it when connecting, and then without share counts, entry prices and notes.

What does the connection not deliver?

The share price, the market capitalisation, single metrics such as P/E or margins, and the values of the individual valuation models. Your AI gets the distance to fair value in 10-point bands (for example 10 to 20%), not as an exact percentage. Everything else is on the analysis page of the stock, which every answer links to.

Can the AI change my watchlist?

Yes, with a free account up to 10 stocks as on the website, with Pro without this limit. Only if you allow it when connecting and only on your explicit request. It can add and remove stocks. Before every removal we back up the previous list.

What exactly does the alert do?

It covers your whole watchlist. You get an email when one of your stocks changes from On track to Review: the price has reached the optimistic fair value, the Quality Score has fallen below 50 (the minimum of the buy rule) or the stock has been on it for five years. Your AI can turn it on and off. There are no price-target alerts.

I am already connected. What do I need to do?

Nothing for valuations. For watchlist and alert, disconnect once and connect again, because you have to agree to the new permissions.

Can I disconnect again?

Yes, any time in your account under "Connected AI assistants".

Does the AI know the buy rules of the strategy?

Yes. For every stock it gets the three checks as on the site: fair value upside of at least 30%, quality score of at least 50 and an uptrend (price one month ago higher than twelve months ago). The strategy only buys stocks with all three.

Is this investment advice?

No. It is a valuation by fixed rules, not a recommendation.

Give your AI the right number

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