{
  "page": "https://x402-list.com/apis/email-validation-api",
  "title": "Email validation APIs you can pay per call",
  "answer": "As of October 26, 2026, x402-list compares 5 email validation services with task-matched endpoints. The median selected call costs $0.005. DNS checks and domain authentication do not establish mailbox ownership.",
  "date_modified": "2026-10-26",
  "license": "https://creativecommons.org/licenses/by/4.0/",
  "cite_as": "x402-list, \"Email validation APIs you can pay per call\", https://x402-list.com/apis/email-validation-api, data as of 2026-10-26. Licensed CC BY 4.0.",
  "how_to_cite": "Quote the number with its date and link the page URL. Data is CC BY 4.0: attribution to x402-list is required.",
  "methodology": "https://x402-list.com/methodology",
  "criteria": {
    "listed": "online, payment-ready, 30-day uptime >= 90%, known price, description >= 80 characters",
    "price": "cheapest current email validation endpoint of each service, USD per call (not its cheapest tool of any kind); services without one are left out",
    "generalist": "a gateway matching more than three unrelated capabilities: listed, never called the cheapest",
    "buyers_30d": "distinct wallets that paid the service on-chain in the last 30 days (measured floor)",
    "best": "most distinct buyers in 30 days; ties go to higher 30-day uptime"
  },
  "in_index": true,
  "stats": {
    "services": 5,
    "with_buyers_30d": 4,
    "median_price_usd": 0.005,
    "min_price_usd": 0.004,
    "max_price_usd": 0.1,
    "generalists": 1,
    "left_out_no_task_endpoint": 2
  },
  "faq": [
    {
      "question": "Is a zero-price option available?",
      "answer": "The 5 listed services have positive per-call prices for their task endpoints. Check the exact input shape and provider terms; promotional credits or a free sample do not establish a zero-price paid route."
    },
    {
      "question": "What do 100,000 calls cost?",
      "answer": "At the median selected quote, 100,000 calls total $500.00 at $0.005 per call. This reference calculation assumes the same request shape and excludes additional products, pagination and retries."
    },
    {
      "question": "Does HTTP 402 establish a correct paid answer?",
      "answer": "It establishes a payment requirement for the request. A stored challenge, an observed payment and an accurate response are different evidence. Inspect the resource and request schema before using payment terms."
    },
    {
      "question": "Does a valid syntax result prove the inbox exists?",
      "answer": "Syntax evaluates a string's structure. Domain DNS and MX observations describe infrastructure. Individual mailbox existence and ownership require different evidence."
    },
    {
      "question": "Does DNS validation guarantee delivery?",
      "answer": "A mail-domain observation does not determine whether a future message reaches a particular recipient. Preserve the observation time, unknown states and the provider's explicit method limits."
    },
    {
      "question": "Is grading an email draft address validation?",
      "answer": "Draft grading examines message content, such as spam-risk phrases or structure. It does not evaluate the supplied recipient and should be priced as a separate output."
    },
    {
      "question": "Can a typo suggestion overwrite a contact?",
      "answer": "Store it as a suggestion alongside the original input. A domain correction can change the recipient, so apply a deliberate acceptance policy rather than silently replacing the address."
    },
    {
      "question": "How do batch prices compare with single-address prices?",
      "answer": "Check the maximum inputs and per-item outcome behavior. A fixed request quote for a bounded batch and a single-address request are different paid units; calculate the calls required for your actual list."
    }
  ],
  "services": [
    {
      "name": "AgentBIT",
      "reseller_of_brand_via": null,
      "url": "https://x402-list.com/services/agentbit",
      "price_usd_per_call": 0.03,
      "networks": [
        "ARB",
        "Base",
        "POL",
        "SOL"
      ],
      "uptime_30d": 100,
      "latency_ms": 131,
      "buyers_30d": 71,
      "last_checked_at": "2026-10-26T19:10:29.372Z",
      "what_it_does": "Provider describes live DNS and address-risk checks without mailbox pinging.",
      "generalist": true,
      "price_endpoint": {
        "method": "GET",
        "path": "/v1/email/deliverability"
      },
      "task_endpoints": [
        {
          "method": "GET",
          "path": "/v1/email/deliverability",
          "price_usd_per_call": 0.03
        }
      ],
      "endpoints_listed": 25
    },
    {
      "name": "IPIntel.ai x402 Tools",
      "reseller_of_brand_via": null,
      "url": "https://x402-list.com/services/ipintel-ai-x402-tools",
      "price_usd_per_call": 0.004,
      "networks": [
        "Base"
      ],
      "uptime_30d": 100,
      "latency_ms": 255,
      "buyers_30d": 25,
      "last_checked_at": "2026-10-26T19:03:44.996Z",
      "what_it_does": "Provider separates recipient validation from domain mail-configuration health.",
      "generalist": false,
      "price_endpoint": {
        "method": "POST",
        "path": "/email-validate"
      },
      "task_endpoints": [
        {
          "method": "POST",
          "path": "/domain-health",
          "price_usd_per_call": 0.001
        },
        {
          "method": "POST",
          "path": "/email-validate",
          "price_usd_per_call": 0.004
        }
      ],
      "endpoints_listed": 10
    },
    {
      "name": "Straelo Relay",
      "reseller_of_brand_via": null,
      "url": "https://x402-list.com/services/straelo-relay",
      "price_usd_per_call": 0.005,
      "networks": [
        "Base"
      ],
      "uptime_30d": 100,
      "latency_ms": 229,
      "buyers_30d": 17,
      "last_checked_at": "2026-10-26T19:03:41.163Z",
      "what_it_does": "Provider explicitly limits the basic validator to syntax, domain and MX evidence without SMTP verification.",
      "generalist": false,
      "price_endpoint": {
        "method": "GET",
        "path": "/email-validator/basic"
      },
      "task_endpoints": [
        {
          "method": "GET",
          "path": "/email-validator/basic",
          "price_usd_per_call": 0.005
        }
      ],
      "endpoints_listed": 10
    },
    {
      "name": "RallyLive Intel",
      "reseller_of_brand_via": null,
      "url": "https://x402-list.com/services/rallylive-intel",
      "price_usd_per_call": 0.1,
      "networks": [
        "Base",
        "BSP"
      ],
      "uptime_30d": 100,
      "latency_ms": 218,
      "buyers_30d": 5,
      "last_checked_at": "2026-10-26T19:03:27.271Z",
      "what_it_does": "Provider separates batch recipient checks from sending-domain authentication reports.",
      "generalist": false,
      "price_endpoint": {
        "method": "POST",
        "path": "/bulk/email-verify"
      },
      "task_endpoints": [
        {
          "method": "POST",
          "path": "/bulk/email-verify",
          "price_usd_per_call": 0.1
        },
        {
          "method": "POST",
          "path": "/email/deliverability-report",
          "price_usd_per_call": 0.05
        }
      ],
      "endpoints_listed": 10
    },
    {
      "name": "M0 Email Verification",
      "reseller_of_brand_via": null,
      "url": "https://x402-list.com/services/m0-email-verification",
      "price_usd_per_call": 0.005,
      "networks": [
        "Base"
      ],
      "uptime_30d": 94.2,
      "latency_ms": 434,
      "buyers_30d": 0,
      "last_checked_at": "2026-10-26T19:10:02.555Z",
      "what_it_does": "Provider describes syntax and DNS checks plus a lead-validation bundle, without proof of mailbox existence.",
      "generalist": false,
      "price_endpoint": {
        "method": "POST",
        "path": "/v1/verify-email"
      },
      "task_endpoints": [
        {
          "method": "POST",
          "path": "/v1/lead-validate",
          "price_usd_per_call": 0.015
        },
        {
          "method": "POST",
          "path": "/v1/verify-email",
          "price_usd_per_call": 0.005
        }
      ],
      "endpoints_listed": 3
    }
  ]
}