{
  "page": "best/email-verification-api",
  "title": "Best email verification API for AI agents",
  "task_type": "verify_email",
  "question": "What is the best email verification API for AI agents?",
  "answer": "Early results only. ZeroBounce Validation (ZeroBounce) has the highest score for telling whether an email address is deliverable: 100.0 out of 100 in all regions, from 2 test results in the week of 2026-11-09. 3 tools were scored on the same cases. Arettic runs it with one key and charges only when the result passes the check. Scores firm up once each tool has 30 test results.",
  "indexable": false,
  "early": true,
  "region": "GLOBAL",
  "week": "2026-11-09",
  "samples": 5,
  "ranking": [
    {
      "tool_id": "zerobounce-verify-email",
      "name": "ZeroBounce Validation",
      "provider": "ZeroBounce",
      "task_type": "verify_email",
      "region": "GLOBAL",
      "score": 100,
      "week": "2026-11-09",
      "inputs": {
        "A": 1,
        "S": 1,
        "P": 1,
        "R": 1,
        "L": 1,
        "D": 0
      },
      "sample_size": 2,
      "on_sale": true
    },
    {
      "tool_id": "millionverifier-verify-email",
      "name": "MillionVerifier",
      "provider": "MillionVerifier",
      "task_type": "verify_email",
      "region": "GLOBAL",
      "score": 96.01,
      "week": "2026-11-09",
      "inputs": {
        "A": 1,
        "S": 1,
        "P": 1,
        "R": 1,
        "L": 0.2026,
        "D": 0
      },
      "sample_size": 1,
      "on_sale": true
    },
    {
      "tool_id": "abstract-verify-email",
      "name": "Abstract Email Validation",
      "provider": "Abstract",
      "task_type": "verify_email",
      "region": "GLOBAL",
      "score": 15,
      "week": "2026-11-09",
      "inputs": {
        "A": 0,
        "S": 0,
        "P": 0,
        "R": 1,
        "L": 1,
        "D": 0
      },
      "sample_size": 2,
      "on_sale": false
    }
  ],
  "picks": [
    {
      "label": "Highest score",
      "input": "score",
      "tool_id": "zerobounce-verify-email"
    },
    {
      "label": "Most accurate",
      "input": "A",
      "tool_id": "zerobounce-verify-email"
    },
    {
      "label": "Most reliable",
      "input": "R",
      "tool_id": "zerobounce-verify-email"
    },
    {
      "label": "Fastest",
      "input": "L",
      "tool_id": "zerobounce-verify-email"
    }
  ],
  "other_regions": [],
  "pass_rule": {
    "passes_if": "The verifier returns a definitive status (valid or invalid)",
    "partial_or_failed": "Unknown or timeout counts as a fail"
  },
  "faq": [
    {
      "q": "What is the best email verification API for AI agents?",
      "a": "Early results only. ZeroBounce Validation (ZeroBounce) has the highest score for telling whether an email address is deliverable: 100.0 out of 100 in all regions, from 2 test results in the week of 2026-11-09. 3 tools were scored on the same cases. Arettic runs it with one key and charges only when the result passes the check. Scores firm up once each tool has 30 test results."
    },
    {
      "q": "How is the score worked out?",
      "a": "Every tool runs the same test cases each week. The score combines accuracy, pass rate, audit precision, reliability, speed and upheld disputes. The formula and every input are public on the scores page. Paying never changes a score."
    },
    {
      "q": "Do I need an account with each provider?",
      "a": "No. One Arettic key runs every tool. Arettic holds the provider accounts and keys."
    },
    {
      "q": "What do I pay when a lookup fails?",
      "a": "You pay only for what passes the check. It passes if: the verifier returns a definitive status (valid or invalid). Unknown or timeout counts as a fail."
    },
    {
      "q": "Can my agent pick the tool itself?",
      "a": "Yes. Call recommend with task_type verify_email for the ranked list, then execute the tool you want. Both work over the HTTP API and the MCP server."
    }
  ],
  "license": {
    "id": "CC-BY-4.0",
    "url": "https://creativecommons.org/licenses/by/4.0/",
    "attribution": "Arettic (arettic.com)"
  }
}