SEC filings & market structure

Money Market Funds (N-MFP)

Monthly Form N-MFP3 reports from every SEC money-market fund — one record per fund per month with net assets, weighted average maturity and life, the fund's DAILY daily/weekly liquid-asset percentages, daily market-based shadow NAV (the breaking-the-buck series), daily 7-day gross yield, and monthly gross subscriptions/redemptions. Coverage: the N-MFP3 era, June 2024-present (~350 fund-months per month). The adviser file number joins the Form ADV registry.

EndpointGET /v1/money-market-funds

SourceSEC Form N-MFP3 (EDGAR)

Authx-api-key — a free key works

What it returns

One record per (fund series, month). Daily series (liquidity, shadow NAV, yield) are nested arrays, verbatim from the filing. See the live example below for the full field set.

Filters

accession_number	Direct lookup by EDGAR accession number.
cik	Registrant CIK (any zero-padding).
series_id	EDGAR series ID (e.g. 'S000096464') — one fund's monthly history.
fund_name	Case-insensitive substring against registrant or series name.
fund_category	Verbatim N-MFP category: 'Government', 'Prime', 'Single State', 'Other Tax Exempt', …
is_retail_fund	Filter to retail (true) / institutional (false) funds.
since	report_date lower bound (YYYY-MM-DD inclusive).
until	report_date upper bound (YYYY-MM-DD inclusive).
sort_by	Default report_date (newest month first).
sort_order	Default desc.
limit	Maximum records. Default 50, max 500.

Example request

curl "https://api.keyvex.com/v1/money-market-funds?limit=1" \
  -H "x-api-key: YOUR_KEY"

Response

{
  "results": [
    {
      "gross_subscriptions_month": null,
      "cik": "0000888129",
      "series_lei": "549300PDG2ZFF5RRB446",
      "adviser_file_number": "801-37706",
      "shares_outstanding": 5586392384.387,
      "wal_days": 61,
      "source_url": "https://www.sec.gov/Archives/edgar/data/888129/0001193125-26-293654.txt",
      "liquidity_daily": [
        {
          "date": "2026-06-01",
          "pct_daily_liquid_assets": 0.9991,
          "pct_weekly_liquid_assets": 0.9991
        },
        {
          "date": "2026-06-02",
          "pct_daily_liquid_assets": 0.9992,
          "pct_weekly_liquid_assets": 0.9992
        },
        {
          "date": "2026-06-03",
          "pct_daily_liquid_assets": 0.999,
          "pct_weekly_liquid_assets": 0.999
        },
        {
          "date": "2026-06-04",
          "pct_daily_liquid_assets": 0.9993,
          "pct_weekly_liquid_assets": 0.9993
        },
        {
          "date": "2026-06-05",
          "pct_daily_liquid_assets": 0.9989,
          "pct_weekly_liquid_assets": 0.9989
        },
        {
          "date": "2026-06-08",
          "pct_daily_liquid_assets": 0.9988,
          "pct_weekly_liquid_assets": 0.9988
        },
        {
          "date": "2026-06-09",
          "pct_daily_liquid_assets": 0.9994,
          "pct_weekly_liquid_assets": 0.9994
        },
        {
          "date": "2026-06-10",
          "pct_daily_liquid_assets": 0.9992,
          "pct_weekly_liquid_assets": 0.9992
        },
        {
          "date": "2026-06-11",
          "pct_daily_liquid_assets": 0.9992,
          "pct_weekly_liquid_assets": 0.9992
        },
        {
          "date": "2026-06-12",
          "pct_daily_liquid_assets": 0.9991,
          "pct_weekly_liquid_assets": 0.9991
        },
        {
          "date": "2026-06-15",
          "pct_daily_liquid_assets": 0.9993,
          "pct_weekly_liquid_assets": 0.9993
        },
        {
          "date": "2026-06-16",
          "pct_daily_liquid_assets": 0.9998,
          "pct_weekly_liquid_assets": 0.9998
        },
        {
          "date": "2026-06-17",
          "pct_daily_liquid_assets": 0.9995,
          "pct_weekly_liquid_assets": 0.9995
        },
        {
          "date": "2026-06-18",
          "pct_daily_liquid_assets": 0.9993,
          "pct_weekly_liquid_assets": 0.9993
        },
        {
          "date": "2026-06-22",
          "pct_daily_liquid_assets": 0.999,
          "pct_weekly_liquid_assets": 0.999
        },
        {
          "date": "2026-06-23",
          "pct_daily_liquid_assets": 0.9996,
          "pct_weekly_liquid_assets": 0.9996
        },
        {
          "date": "2026-06-24",
          "pct_daily_liquid_assets": 0.9987,
          "pct_weekly_liquid_assets": 0.9987
        },
        {
          "date": "2026-06-25",
          "pct_daily_liquid_assets": 0.9996,
          "pct_weekly_liquid_assets": 0.9996
        },
        {
          "date": "2026-06-26",
          "pct_daily_liquid_assets": 0.9995,
          "pct_weekly_liquid_assets": 0.9995
        },
        {
          "date": "2026-06-29",
          "pct_daily_liquid_assets": 0.9995,
          "pct_weekly_liquid_assets": 0.9995
        },
        {
          "date": "2026-06-30",
          "pct_daily_liquid_assets": 0.9996,
          "pct_weekly_liquid_assets": 0.9996
        }
      ],
      "filing_index_url": "https://www.sec.gov/Archives/edgar/data/888129/000119312526293654/0001193125-26-293654-index.htm",
  
  …

Example questions you can answer

Money-market fund assets and flows by fund family.
A fund's daily liquidity percentages through a stress month.
Shadow-NAV deviation from the stable $1.00 price.
Prime vs Government fund positioning; WAM as a rates signal.

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