Disposable Email Grounding Data

Overview

Send a complete email address to check it against a list of over 100,000 throwaway domains updated daily. The check extracts the domain and tests both exact matches and parent domains. The response returns the parsed domain along with a boolean flag indicating if the address is disposable.

Live Test Disposable Email Grounding Data Source →

The tool

Once your client is connected to the VerveContext server, this appears in its tool list as DisposableEmailGroundingData. 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.

{
  "name": "DisposableEmailGroundingData",
  "arguments": {
    "email": "[email protected]"
  }
}

You do not name the tool yourself; the model picks it. Asking about [email protected] in the terms this source covers is enough for it to reach for DisposableEmailGroundingData on its own — naming it explicitly also works, and is the way to force the call.

Connecting

One server URL covers every source 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": {
    "vervecontext": {
      "url": "https://api.vervecontext.com/v1/mcp"
    }
  }
}

https://api.vervecontext.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.

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.

1
2
3
4
5
6
7
8
9

{
  "status": "ok",
  "error": null,
  "data": {
    "isDisposable": false,
    "email": "[email protected]",
    "domain": "myspace.com"
  }
}

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.

Why ground on it

A model can produce something that looks like this answer from its training data, and be confidently out of date or simply wrong. This source returns the current value in a shape you can check, which is the difference between an answer you can cite and one you have to hedge.

Point an evaluation at isDisposable: it is the field most worth pinning a claim to, and it is either present and current or absent — never plausibly invented.

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.

A call costs 6 credits each time the tool actually runs; a model that reasons about the tool without calling it costs nothing.

Use cases

User Registration Screening

To stop fake signups, SaaS apps check user email addresses at registration and reject submissions matching temporary domain lists.

Mailing List Cleaning

Filter out temporary inboxes from marketing contact databases before scheduling newsletter campaigns to protect sender reputation and delivery rates.

Gated Content Verification

When visitors request whitepapers or trial access, verify their email domain immediately to require a genuine corporate or personal inbox.

Promo Abuse Prevention

E-commerce stores evaluate customer emails during checkout to prevent shoppers from repeatedly claiming first-order discounts with burner accounts.

Other ways to use Disposable Email Grounding Data

Set up Disposable Email Grounding Data on VerveContext, or reach the same source a different way. Your VerveContext account and credits work on all of them — one key, one balance.

Related

More in Data Validation: