US Mortgage Rate Skill

Overview

Mortgage Rate provides current and historical mortgage rate data from 1971 to present. The data comes from Freddie Mac's Primary Mortgage Market Survey, which has tracked mortgage rates weekly since the early 1970s. Use this for mortgage calculations, market analysis, and financial planning.

Live Test US Mortgage Rate Skill Skill →

The tool

Once your client is connected to the VerveKit server, this appears in its tool list as USMortgageRateSkill. It is read-only and open-world — it fetches and never mutates anything on your side — so most clients call it without asking you to confirm.

Tool call

{
  "name": "USMortgageRateSkill",
  "arguments": {
    "type": "30year"
  }
}

You do not name the tool yourself; the model picks it. Asking about 30year in the terms this skill covers is enough for it to reach for USMortgageRateSkill on its own — naming it explicitly also works, and is the way to force the call.

Connecting

One server URL covers every skill in the catalog, including this one. Authorization is OAuth: the client opens a browser once, and there is no key to paste into a config file.

{
  "mcpServers": {
    "vervekit": {
      "url": "https://api.vervekit.com/v1/mcp"
    }
  }
}

Per-client setup — Claude, Cursor, VS Code, ChatGPT — is on the MCP setup page.

Arguments

These are the properties on the tool's inputSchema, so a well-behaved client validates them before the call is made. Premium arguments are accepted on every plan but only take effect on plans that include them.

Argument	Type	Description
`type`Required	string	The mortgage type `30year15year`
`year`OptionalPremium	integer	Year to retrieve rates for (1971-present). Requires month parameter. range 1971–2030
`month`OptionalPremium	integer	Month to retrieve rates for (1-12). Required when year is specified. range 1–12

What the model gets back

The result carries a structuredContent object matching the tool's declared outputSchema, so a client reads fields without parsing prose. status is "ok" and error is null on success; a null field means the value was not available for that input, not that the call failed.

Result

{
  "status": "ok",
  "error": null,
  "data": {
    "rateType": "30year",
    "name": "30-Year Fixed Rate Mortgage",
    "term": 30,
    "type": "fixed",
    "country": "US",
    "year": 2023,
    "month": 6,
    "count": 4,
    "rates": [
      {
        "week": "2023-06-01",
        "rate": 6.79
      },
      {
        "week": "2023-06-08",
        "rate": 6.71
      },
      {
        "week": "2023-06-15",
        "rate": 6.69
      },
      {
        "week": "2023-06-22",
        "rate": 6.67
      }
    ],
    "change1w": -0.02,
    "changeDirection": "down",
    "previousRate": 6.69,
    "previousDate": "2023-06-15"
  }
}

Response fields

Paths are relative to data. Premium fields are absent rather than zeroed on plans that do not include them, so check for presence instead of comparing to 0.

Field	Type	Example	Description
`rateType`	string	`30year`	Mortgage rate type identifier (30year or 15year)
`name`	string	`30-Year Fixed Rate Mortgage`	Human-readable description of mortgage type
`term`	number	`30`	Loan term in years (15 or 30)
`type`	string	`fixed`	Rate type classification (fixed or adjustable)
`country`	string	`US`	Country code where rates apply (US)
`year`	number	`2023`	Year of the mortgage rate data
`month`	number	`6`	Month of the mortgage rate data (1-12)
`count`	number	`4`	Number of weekly rate entries in response
`rates`	array[4]		Array of weekly mortgage rate data entries
`rates.0.week`	string	`2023-06-01`	Week date in YYYY-MM-DD format
`rates.0.rate`	number	`6.79`	Mortgage interest rate as percentage
`change1w`Premium	number	`-0.02`	Rate change from previous week in percentage points
`changeDirection`	string	`down`	Direction of weekly change: up, down, or unchanged
`previousRate`Premium	number	`6.69`	Previous week's mortgage interest rate
`previousDate`Premium	string	`2023-06-15`	Previous week's date in YYYY-MM-DD format

Failure modes

Errors come back as tool errors carrying a sentence the model can act on, not a bare status code. Error handling covers the full list.

Status	What it means
`400` / `422`	The arguments did not validate. The message names the offending one.
`401`	The OAuth session is invalid or expired — reconnect the server.
`403`	Blocked by a key restriction or an IP allow-list. Never a bad identity.
`404`	This skill is not part of VerveKit. Check the catalog.
`429`	Out of credits, or a brief rate limit. The message tells them apart.

A call costs 2 credits each time the tool actually runs; a model that reasons about the tool without calling it costs nothing.

Use cases

Home Listing Calculators: Populate monthly payment estimates across real estate portals by feeding current 30-year fixed rates into listing mortgage calculators.
Refinance Comparison Portals: When evaluating refinancing offers, mortgage brokers compare current 15-year and 30-year rates to highlight interest savings for homeowners.
Borrower Rate Alerts: To help homebuyers time their financing, personal finance platforms track weekly rate trend directions and notify borrowers when costs drop.
Housing Market Newsletters: Property investment newsletters graph weekly mortgage percentage changes against pending sales to assess shifts in buyer purchasing power.

Other ways to use US Mortgage Rate Skill

Set up US Mortgage Rate Skill on VerveKit, or reach the same source a different way. Your VerveKit account and credits work on all of them — one key, one balance.

Call it as a REST APIOne HTTPS endpoint and an x-api-key header, with SDKs for Node, Python and .NET.APIVerve →Reference →

Google Sheets or ExcelA =VERVE() formula fills a column — no script, no export, recalculates in place.VerveSheets →Reference →

Ground an agent on itA cited, machine-checkable fact your model can't produce on its own.VerveContext →Reference →