Fundz Agent API — buying signals API for GTM agents

Every signal links to the filing it came from.

Fundz is a buying signals API and MCP server for sales agents: dated funding rounds and SEC 8-K events, each one carrying the source document. It is a company event API rather than a contact database — the trigger data for AI SDRs that tells an agent why now, with a link a human can open before anything gets sent.

Two lanes, both primary-filed:

• SEC 8-K API — material events filed with the SEC, linked to the filing on sec.gov.

• Form D funding data API — private-offering filings parsed from EDGAR, plus funding announcements, with the offering amount normalised to USD.

Nothing is inferred. If Fundz has no dated event for a company in your window, it says so instead of guessing — an empty answer is a real answer, and it is the reason the evidence is quotable.

curl -s https://api.fundz.net/v1/agent/why_now \
  -H "X-Fundz-Key: $FUNDZ_KEY" \
  -H 'Content-Type: application/json' \
  -d '{"domain":"databricks.com"}'

{
  "company": { "name": "Databricks", "domain": "databricks.com", "resolution_confidence": 1.0 },
  "evidence": [
    { "type": "funding", "date": "2026-08-12",
      "summary": "Databricks raised $1B Series K.",
      "source_url": "https://www.sec.gov/Archives/edgar/data/1587468/.../primary_doc.xml",
      "source_kind": "sec_form_d" }
  ]
}

What it returns

Dated evidence with a source URL on every item, the resolved company, and a resolution_confidence score so you can refuse to act on an uncertain match. Usage comes back in X-Fundz-Units headers on every response.

What it does not return

No contacts. No emails. No phone numbers. Fundz answers which companies just did something worth calling about, not who to call. Pair it with your own contact source.

It is also not a prediction product. predicted_next is explicitly experimental — treat lift as a ranking aid, not a validated rate.

Pricing

Unit costs: why_now 1 · events_for_icp 1 · predicted_next 1 · watchlist_diff 0.1 per company checked. A 400-company book costs 40 units to diff.

Quickstart

export FUNDZ_KEY=fundz_ak_live_...                       # 1. your key, from the welcome email
BASE=https://api.fundz.net/v1/agent                      # 2. base URL

curl -s $BASE/why_now      -H "X-Fundz-Key: $FUNDZ_KEY" \
  -H 'Content-Type: application/json' -d '{"domain":"stripe.com"}'          # 3. one company

curl -s $BASE/events_for_icp -H "X-Fundz-Key: $FUNDZ_KEY" \
  -H 'Content-Type: application/json' \
  -d '{"industries":["software"],"lookback_days":30}'                        # 4. an ICP

curl -s $BASE/watchlist_diff -H "X-Fundz-Key: $FUNDZ_KEY" \
  -H 'Content-Type: application/json' \
  -d '{"domains":["stripe.com","databricks.com"],"since":"2026-08-01"}'      # 5. your book

Full reference: QUICKSTART.md · openapi/

MCP

Streamable HTTP at https://api.fundz.net/v1/agent/mcp. initialize and tools/list need no key; tools/call does.

⛔ That is a subpath, not the REST prefix. /v1/agent reads its last path segment as a tool name, so an MCP handshake posted there is answered 404 unknown tool 'agent'.

Claude Desktop — claude_desktop_config.json:

{
  "mcpServers": {
    "fundz": {
      "url": "https://api.fundz.net/v1/agent/mcp",
      "headers": { "X-Fundz-Key": "fundz_ak_live_..." }
    }
  }
}

Cursor — .cursor/mcp.json:

{
  "mcpServers": {
    "fundz": {
      "url": "https://api.fundz.net/v1/agent/mcp",
      "headers": { "X-Fundz-Key": "fundz_ak_live_..." }
    }
  }
}

More: examples/claude-desktop.md · examples/langgraph_agent.py · examples/clay-http-column.md

FAQ

What is a buying signals API?

An API that returns events — a company raised money, filed an 8-K, changed leadership — rather than static firmographics. The event is the reason to reach out, and the date is what makes it timely. Fundz returns the event plus the document it came from.

How is this different from Crunchbase or PitchBook?

Those are databases you search. This is an API an agent calls per company, per run, and every item comes back with a source URL. Fundz is also priced per unit rather than per seat.

Can I get contact data from the Fundz API?

No. Fundz has no contacts, emails, or phone numbers. It tells you which companies just did something; you bring your own contact source.

What SEC data does the Form D funding data API cover?

Form D private-offering filings parsed from EDGAR — filing entity, offering amount normalised to USD, state, and a sec.gov source URL per record — alongside funding announcements from news.

Does the SEC 8-K API link to the actual filing?

Yes. Every 8-K item carries the sec.gov document URL. That is the point: a rep can open the filing before quoting it to a prospect.

How do I use this as trigger data for AI SDRs?

Call watchlist_diff with your account book on a schedule and act only on companies that come back changed. It bills 0.1 units per company checked, so a 400-company book costs 40 units — the same whether you send it whole or in chunks.

Is there an MCP server for sales agents?

Yes — this one. Streamable HTTP, four tools, works in Claude Desktop, Cursor, and any client that speaks MCP over HTTP. Discovery (initialize, tools/list) is keyless so a client can inspect it before you hand over a credential.

What happens when there is no event?

You get an empty evidence array and a last_event telling you when the most recent one actually was. Fundz does not manufacture a reason to call.

How large can a watchlist_diff request be?

400 domains per request. The limit is the edge, not the API: bodies over 8,192 bytes are refused before they reach us.

Support

support@fundz.net · fundz.net · per-company pages at app.fundz.net/signals · llms.txt