How to give Claude access to SEC filings (free MCP server)

Why Claude can’t just read EDGAR

The SEC’s EDGAR system is public and free, which makes it tempting to assume any capable model can simply read it. In practice there are three walls.

It can’t browse. Out of the box, Claude has no live internet access to fetch a filing index, walk to the right accession number, and download the document. Even with browsing enabled, EDGAR is a thicket of raw HTML, SGML headers and XBRL instance documents that is hostile to ad-hoc scraping.

It hallucinates specifics. Ask a model what items were in a company’s most recent 8-K, or what an insider’s last Form 4 transaction price was, and it will answer fluently. The answer is frequently wrong, because the model is reconstructing a plausible filing rather than retrieving the real one. For research where the number matters, plausible is worse than nothing.

Filings are structured, not prose. A 13F is a table of holdings. A Form 4 is a set of transaction rows. Squeezing those through a chat window as pasted text loses the structure that makes them queryable. You want Claude to be able to ask “which managers added this name last quarter” — that is a database question, not a reading-comprehension question.

What MCP is, briefly

The Model Context Protocol (MCP) is an open standard from Anthropic for connecting AI assistants to external tools and data. An MCP server exposes a set of tools; an MCP client (Claude Desktop, Claude Code, Cursor, ChatGPT’s developer mode) lets the model discover and call them. The model decides when to call a tool and with what arguments; the server does the actual work and returns structured results.

For SEC data, this means you register one server once. From then on, whenever you ask Claude a markets question, it can reach for the right tool — search filings, pull fundamentals, list insider trades — and answer from real data. We cover what makes a good markets MCP server in a separate post; here we focus on getting Claude wired up.

Step 1 — get a free key

ClawTerminal is a markets-research MCP server: SEC filings, fundamentals, prices, macro, crypto and more, behind a single endpoint. It is in free closed beta. Sign in with a magic link — email only, no password — and your personal sk-live-... key is shown after you verify. That key is the credential; the same key works in every client below. The placeholder sk-live-... below stands in for your real key.

Step 2a — connect Claude Desktop

Open your Claude Desktop config file and add a clawterminal entry under mcpServers. The file lives at:

// macOS:    ~/Library/Application Support/Claude/claude_desktop_config.json
// Windows:  %APPDATA%\Claude\claude_desktop_config.json
{
  "mcpServers": {
    "clawterminal": {
      "type": "http",
      "url": "https://mcp.clawterminal.ai",
      "headers": {
        "Authorization": "Bearer sk-live-..."
      }
    }
  }
}

Replace sk-live-... with your key, save, and restart Claude Desktop. The tools appear in the connector list.

Step 2b — connect Claude Code

If you live in the terminal, Claude Code takes a single command — no JSON editing:

# Adds the server project-wide
claude mcp add --transport http clawterminal \
  https://mcp.clawterminal.ai \
  --header "Authorization: Bearer sk-live-..."

# Verify it registered
claude mcp list

That writes the server to your Claude Code config. The next session can call every tool the server exposes.

Step 3 — ask in plain English

Now you talk to Claude normally. When a question needs SEC data, it picks the matching tool and queries the live database. A few examples, and what fires under the hood:

You don’t memorize tool names. ClawTerminal also ships a resolve_entity tool that turns any ticker, CIK, company name, CUSIP or accession number into a canonical id first, plus a search_tools meta-tool so the model can find the right capability by intent. Claude chains them itself.

What Claude can reach once connected

The SEC surface alone covers the forms that actually move research:

• 8-K — current reports, semantically searchable, with price-reaction studies around the event.
• 10-K / 10-Q — section-aware narrative search across risk factors, MD&A and business descriptions.
• Form 4 — insider transactions, with cluster-buy detection and top-buyer/seller rankings.
• Schedule 13D / 13G — beneficial ownership and activist stakes.
• 13F-HR — institutional holdings and quarter-over-quarter changes.
• N-PORT — fund holdings, returns and debt exposure.
• DEF 14A — proxy statements and executive compensation.
• S-1 / 424B — IPO prospectuses.

And because it is a full markets terminal, the same connection also gives Claude XBRL fundamentals, split-adjusted prices and dividends, FRED macro series, crypto perps and prediction markets — so a filings question can flow straight into a valuation or a price-reaction check without switching tools.

That’s it

Two minutes of setup converts Claude from a model that describes filings from memory into one that retrieves them. The model stays the same; you’ve simply stopped asking it to be the database. Once the data is real, the interesting work begins — which is what the rest of this blog is about.