Email address validation without sending mail

$0.003 per call · failed calls are never charged · no account or API key needed

Check email syntax, DNS and MX records, disposable providers, role addresses, free providers and SPF/DMARC presence. Returns likely-deliverable, risky, undeliverable or invalid with reasons. No message is sent and the mail server is not contacted. These are DNS and syntax signals, not proof that a mailbox exists or accepts delivery. Use before sending mail or saving a signup.

Run it free (25 free calls) Buy credits by card (from $5) Example result (JSON)

Inputs

NameTypeDescription
address (required)stringThe email address to check

Request

Over HTTP, with a card key from /credits:

curl -H "Authorization: Bearer adt_…" "https://agent-data-tools.revmesh2074.workers.dev/email?address=support%40cloudflare.com"

Or one of your 25 free calls, no key:

curl "https://agent-data-tools.revmesh2074.workers.dev/email?address=support%40cloudflare.com&trial=1"

Without a key, the same URL answers 402 Payment Required with x402 and MPP terms, so an agent with a wallet pays per call in USDC (Base, Polygon, Arbitrum, Monad, World Chain or Tempo) and retries.

Example result

{
  "address": "support@cloudflare.com",
  "validSyntax": true,
  "domain": "cloudflare.com",
  "domainExists": true,
  "acceptsMail": true,
  "disposable": false,
  "roleAddress": true,
  "freeProvider": false,
  "hasSpf": true,
  "hasDmarc": true,
  "verdict": "likely-deliverable",
  "reasons": [
    "role address, not a person"
  ]
}

From an AI agent (MCP)

Add the MCP server to Claude, Cursor or any MCP client. This tool is email, and the first 25 successful calls are free:

https://agent-data-tools.revmesh2074.workers.dev/mcp

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