COMPANYPEOPLEFINANCIAL API MCP READY

NFX Signal Investor API

An investor data API built on the public Signal by NFX investor lists. Pull venture investors with their role, firm, investment locations and the minimum, target and maximum check they write, or switch to firm mode for a VC directory ready to import. Optional LinkedIn and Crunchbase enrichment attaches firmographics and funding data per firm. No login required, pay per result.

MEDIAN LAGon demand

PARAMETERS9

TOTAL RUNS32

SUCCESS (30D)100.0%

RATINGno ratings yet

LAST MODIFIED2026-08-24

PUBLISHED2026-08

Input parameters

PARAMETER	TYPE	REQ	DEFAULT	DESCRIPTION
mode	enum	no	investors	investors · firms · lists. Run lists first to discover the slugs the other two modes take.
listSlugs	string[]	no	—	Which lists to pull, for example fintech-seed or san-francisco-bay-area. Required for investors and firms mode.
maxItems	integer	no	0	Cap on rows returned. 0 means no limit, and a single list can hold more than 8,000 investors, so set it while exploring. — drives your bill
pageSize	integer	no	50	Investors requested per page. The default is a good balance for a full sweep.
includeFirms	boolean	no	false	In investors mode, also emit one deduplicated row per firm.
stage	enum	no	—	Filters the list catalog. pre_seed · seed · series_a · series_b
locationId	string	no	—	Optional location tag filter for the list catalog.
enrichWithLinkedIn	boolean	no	false	Attach LinkedIn firmographics per firm. Adds minutes to a run. — drives your bill
enrichWithCrunchbase	boolean	no	false	Attach Crunchbase funding data per firm. Adds minutes to a run. — drives your bill

Worked examples

Discover the catalog — every public list with its size, stage and sector

{ "mode": "lists" }

Find investors for a raise — investors with the check size each one writes

{
  "mode": "investors",
  "listSlugs": ["saas-seed"],
  "maxItems": 100
}

VC firms in one city — firm directory ready for a CRM import

{
  "mode": "firms",
  "listSlugs": ["san-francisco-bay-area"]
}

Enriched investor list — firmographics and funding attached per firm

{
  "mode": "investors",
  "listSlugs": ["ai-seed"],
  "maxItems": 25,
  "enrichWithCrunchbase": true
}

POWER-USER TIP

Run lists mode before anything else — The slugs are not guessable. A list is named sector-stage, for example fintech-seed or ai-series-a, and geography is modelled as a sector rather than a separate filter, so San Francisco is the list san-francisco-bay-area. Pull the catalog once, then pass the exact slug values you want.

POWER-USER TIP

Keep enrichment off until you need it — Enrichment resolves each firm by name, which takes minutes on a list with dozens of firms and bills per firm. Get the investor rows first, confirm the shape is right, then re-run with enrichment on a narrowed set.

POWER-USER TIP

Check size is published, not estimated — Investors who do not publish a range come back with empty check-size fields rather than a guess, so an empty value means unknown rather than zero.

Coverage

349

investor lists — 103 sectors across four stages, plus 14 geographies

103

sectors — FinTech · AI · SaaS · Enterprise · Health · ClimateTech +97

14

geographies — SF Bay Area · New York · London · Boston · LA · Israel +8

8,775

largest single list — fintech-seed

Tasks

Saved runs with the inputs already filled in — each one a standalone page and a working configuration example.

Request a task →

Code

curl

curl -X POST "https://api.apify.com/v2/acts/johnvc~nfx-signal-investor-api/run-sync-get-dataset-items" \
  -H "Authorization: Bearer $APIFY_TOKEN" \
  -H "Content-Type: application/json" \
  -d '{"mode":"investors","listSlugs":["fintech-seed"],"maxItems":50}'

Python

from apify_client import ApifyClient

client = ApifyClient("APIFY_TOKEN")
run = client.actor("johnvc/nfx-signal-investor-api").call(
    run_input={"mode": "investors", "listSlugs": ["ai-seed"], "maxItems": 50}
)
for inv in client.dataset(run.default_dataset_id).iterate_items():
    print(inv.get("name"), inv.get("firmName"), inv.get("targetInvestment"))

What people use it for

• Building a target investor list for a fundraise
• Finding pre-seed and early stage investors by sector
• Exporting a list of VC firms for one city
• Mapping which firms are active in a vertical
• Enriching an investor CRM with firmographics
• Tracking new investors entering a sector month over month

Alternatives

Startup Investor Database — a standing database of investor firms with contacts, rather than list membershipours Crunchbase Company API — company-centric funding data rather than investor-centric check sizesours PitchBook Company API — private company valuations and financials rather than investor listsours