Email address verification: deliverability signals without sending mail

$0.01 per call · failed calls are never charged · no account or subscription: pay per call with a card key or USDC

Verify an email address without sending mail: syntax, domain and MX records, disposable and free providers, role addresses, SPF and DMARC presence, with a verdict (likely-deliverable, risky, undeliverable, invalid) and reasons. DNS and syntax signals only: the mailbox itself is not contacted, so this is not proof that a mailbox exists. Use before sending mail, saving a signup or scoring a lead.

Run it free (25 free calls) Buy credits by card (from $1) Example result (JSON)

Try it with your own inputs

The email address to verify

Uses one of your 25 free calls. Nothing is charged, and a call that fails is not counted.

Inputs

NameTypeDescription
address (required)stringThe email address to verify

Request

Over HTTP, with a card key from /credits:

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

Or one of your 25 free calls, no key:

curl "https://agent-data-tools.revmesh2074.workers.dev/email/verify?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 or Solana over x402; Base or Tempo over MPP) 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_verify, and the first 25 successful calls are free:

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

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