Yellowkey in Claude
The Yellowkey connector lets Claude, and any assistant that speaks the Model Context Protocol, read Yellowkey's research data while it works on your question: more than 10,000 listed companies worldwide and about 7,000 ETFs. It reads only. It cannot change your account, place orders or act on your behalf anywhere.
Set it up
- In Claude, open Settings, then Connectors, and choose Add custom connector.
- Paste this address:
https://mcp.yellowkey.ai/mcp - Claude sends you to yellowkey.ai. Sign in with Google (a free account is created if you have none) and choose Allow.
- Back in Claude, the Yellowkey tools are available in your conversations.
In Claude Code: claude mcp add --transport http yellowkey https://mcp.yellowkey.ai/mcp
What it can do
| Tool | What it returns | Allowance |
|---|---|---|
| Find a company or ETF | Looks up a name or ticker and returns the identifiers. | Free |
| Company sheet | What a company does, what it said at its latest results, its figures against peers, its sector, its documents. | 1 call |
| ETF sheet | Index, cost, size, holdings, exposures, performance and rank in its category. | 1 call |
| Screen stocks | Companies by geography, sector, any metric, guidance direction, or what they said. | 1 call |
| Screen ETFs | Funds by theme, asset class, region, issuer, cost, size and structure. | 1 call |
| Metric catalogue | The list of metrics, with units and definitions. | Free |
| Results calendar | Who reports between two dates. | 1 call |
| Results call transcript | A call, speaker by speaker. On plans that include company documents. | 1 call |
Things to ask
- “Using Yellowkey, what did Kongsberg Gruppen say about its order backlog at its latest results, and did guidance change?”
- “With Yellowkey, find European industrial companies with a return on capital above 15% that raised guidance at their latest results.”
- “Compare the cheapest European defence ETFs in Yellowkey: cost, size, top holdings.”
- “Which large German companies report results next week, according to Yellowkey?”
Allowance
Free and Basic accounts include 3 calls a month through the connector, enough to try it. Pro and API plans include a daily allowance for regular use. Finding a security and reading the metric catalogue are always free, and a call that fails is not counted. When the allowance is used up, the tool says so in the conversation, with the date it restarts and a link to the plans; a new plan applies at once.
What Yellowkey does not do
Yellowkey reports facts and what companies said. It does not give investment advice, price targets or opinions on valuation, and neither do its tools.
Privacy and security
Sign-in uses OAuth with PKCE; Claude never sees your Yellowkey sign-in, and Yellowkey never sees your Claude password. Yellowkey receives only the tool calls made for you (for example a company identifier or screening filters), not the rest of your conversation. Disconnect at any time from Claude's connector settings. Details in the privacy policy and the terms.
If something does not work
- “Not signed in” or repeated sign-in prompts: remove the connector in Claude and add it again.
- “Allowance reached”: wait for the date shown, or change plan; the new allowance applies at once.
- A company is not found: ask Claude to search by name first, then use the ISIN it returns.
Support: hello@yellowkey.ai.