Zip Code Lookup Skill

Overview

Zip Codes Lookup works by querying a large database of zip codes to retrieve the zip codes of a city. It returns the zip codes in a structured format.

Live Test Zip Code Lookup Skill Skill →

The tool

Once your client is connected to the VerveKit server, this appears in its tool list as ZipCodeLookupSkill. 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": "ZipCodeLookupSkill",
  "arguments": {
    "zip": "64082"
  }
}

You do not name the tool yourself; the model picks it. Asking about 64082 in the terms this skill covers is enough for it to reach for ZipCodeLookupSkill 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
`zip`Required	string	The zip code for which you want to get the data length 5–5

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": {
    "zipcode": "64082",
    "state_abbr": "MO",
    "latitude": "38.850243",
    "longitude": "-94.39570",
    "city": "Lees Summit",
    "state": "Missouri"
  }
}

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
`zipcode`	string	`64082`	The ZIP code for the requested location
`state_abbr`	string	`MO`	Two-letter state abbreviation code
`latitude`Premium	string	`38.850243`	Geographic latitude coordinate of the location
`longitude`Premium	string	`-94.39570`	Geographic longitude coordinate of the location
`city`	string	`Lees Summit`	City name associated with the ZIP code
`state`	string	`Missouri`	Full state name corresponding to the abbreviation

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

Checkout Address Autofill: Fill in city and state names automatically when an online shopper types their five-digit postal code during checkout.
Delivery Zone Assignment: Dispatch software queries a target city and state to collect every valid postal code before assigning regional courier routes.
Territory Sales Mapping: When sorting sales leads, CRM systems look up postal codes to group prospects under the correct state and municipal account reps.
Shipping Address Verification: To prevent delivery exceptions, order management systems check customer-entered postal codes against returned state codes before processing fulfillment.

Other ways to use Zip Code Lookup Skill

Set up Zip Code Lookup 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 →