Security · x402 · early usage

Email Validate ($0.006): syntax + live MX/A-fallback deliverability + disposable-domain…

by draconic21-x402-api.onrender.com · discovered, not yet claimed by its owner · updated 2026-10-09

30d calls3

30d payers3

MethodPOST

Outputjson

Mirrored from Coinbase's public x402 Bazaar. The description is the provider's own text and has not been reviewed here; the payment requirements are copied as published.

What it does

Email Validate ($0.006): syntax + live MX/A-fallback deliverability + disposable-domain + role-address + free-webmail-provider + SPF/DMARC, with no third-party validation vendor at all -- syntax is RFC 5321/5322 grammar, MX/A/SPF/DMARC are live DNS via this server's own resolver (the same protocol-level sourcing as domain_intel), and disposable-domain detection is a static self-maintained list. Never opens an SMTP connection to the mailbox or confirms one specific inbox exists. Body { email }…

Tags: email-validation · email-verification · mx-lookup · disposable-email · deliverability · bazaar

Call contract

Method: POST
Input: json
Output: json
Last paid call: 2026-10-09

Input example from Bazaar metadata

{
  "email": "[email protected]"
}

Output example

{
  "caveats": [
    "This never opens an SMTP connection to the mailbox and never confirms a specific inbox exi…"
  ],
  "disposable": false,
  "dmarc_policy": null,
  "dmarc_present": false,
  "domain": "example.com",
  "domain_exists": true,
  "email": "[email protected]",
  "free_provider": false,
  "has_mx": false,
  "mx": [],
  "reason": "domain has no MX records; falls back to its A/AAAA record (RFC 5321 implicit MX) -- mail d…",
  "role_address": true,
  "spf_present": false,
  "valid_syntax": true,
  "verdict": "risky"
}

Use with an agent

Discover. Agents find this listing with GET https://bazaar.saylorinnovations.com/discovery/search?query=…, the MCP tool search_resources, or /discovery/resources.
Inspect. Fetch /resources/36078.json for the price and payment options.
Pay. Call GET https://draconic21-x402-api.onrender.com/v1/email_validate. The provider answers 402 with its payment requirements. An x402 client signs one of the options below and retries with PAYMENT-SIGNATURE.
Execute. The provider returns 200 with the data. Agent Bazaar is not in the request path and never sees your payment.

For humans

You don't need an account or an API key; you need a wallet holding a small amount of USDC on Base, Solana, and an x402-capable client (see the examples below). Call the endpoint unpaid first to see exactly what it asks for.

Pricing & payment

Price: $0.006 / request
Protocol: x402 v2
Auth: No account or API key. Pay per request.
Networks: Base, Solana
Demand: 3 calls · 3 unique payers in 30d (public x402 Bazaar data)

x402 payment requirements

Scheme	Network	Asset	Amount	Pay to	Timeout
exact	Base eip155:8453	USDC	$0.006	0x1520Ef5530AA71350049BE2903Cf078B38c40AE5	300s
exact	Solana solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp	USDC	$0.006	6mc4GhWFyNcMh7gAVDWrKeYjDqFtEKWKQuZ9RTw2VkfM	300s

accepts[] (raw JSON)

[
  {
    "scheme": "exact",
    "network": "eip155:8453",
    "payTo": "0x1520Ef5530AA71350049BE2903Cf078B38c40AE5",
    "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
    "amount": "6000",
    "amountUsd": 0.006,
    "maxTimeoutSeconds": 300
  },
  {
    "scheme": "exact",
    "network": "solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp",
    "payTo": "6mc4GhWFyNcMh7gAVDWrKeYjDqFtEKWKQuZ9RTw2VkfM",
    "asset": "EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v",
    "amount": "6000",
    "amountUsd": 0.006,
    "maxTimeoutSeconds": 300
  }
]

Schemas

Output schema (JSON Schema)

{
  "properties": {
    "example": {
      "properties": {
        "caveats": {
          "items": {
            "type": "string"
          },
          "type": "array"
        },
        "disposable": {
          "type": [
            "boolean",
            "null"
          ]
        },
        "dmarc_policy": {
          "type": [
            "string",
            "null"
          ]
        },
        "dmarc_present": {
          "type": [
            "boolean",
            "null"
          ]
        },
        "domain": {
          "type": "string"
        },
        "domain_exists": {
          "type": [
            "boolean",
            "null"
          ]
        },
        "email": {
          "type": "string"
        },
        "free_provider": {
          "type": [
            "boolean",
            "null"
          ]
        },
        "has_mx": {
          "type": [
            "boolean",
            "null"
          ]
        },
        "mx": {
          "items": {
            "properties": {
              "exchange": {
                "type": "string"
              },
              "priority": {
                "type": "number"
              }
            },
            "type": "object"
          },
          "type": "array"
        },
        "reason": {
          "type": "string"
        },
        "role_address": {
          "type": [
            "boolean",
            "null"
          ]
        },
        "spf_present": {
          "type": [
            "boolean",
            "null"
          ]
        },
        "valid_syntax": {
          "type": "boolean"
        },
        "verdict": {
          "enum": [
            "deliverable",
            "risky",
            "undeliverable"
          ],
          "type": "string"
        }
      },
      "required": [
        "email",
        "valid_syntax",
        "verdict",
        "reason",
        "caveats"
      ],
      "type": "object"
    },
    "type": {
      "type": "string"
    }
  },
  "required": [
    "type"
  ],
  "type": "object"
}

Example shape — generated from the schema, not a captured live response

{
  "example": {
    "caveats": [
      "string"
    ],
    "disposable": true,
    "dmarc_policy": "string",
    "dmarc_present": true,
    "domain": "string",
    "domain_exists": true,
    "email": "string",
    "free_provider": true,
    "has_mx": true,
    "mx": [
      {
        "exchange": "string",
        "priority": 0
      }
    ],
    "reason": "string",
    "role_address": true,
    "spf_present": true,
    "valid_syntax": true,
    "verdict": "deliverable"
  },
  "type": "string"
}

Examples

curl

curl "https://draconic21-x402-api.onrender.com/v1/email_validate"
# -> 402 Payment Required, accepts[] lists how to pay
# retry with a PAYMENT-SIGNATURE (or PAYMENT header) once paid

JavaScript

const res = await fetch("https://draconic21-x402-api.onrender.com/v1/email_validate");
if (res.status === 402) {
  const { accepts } = await res.json();
  // pay one of accepts[] via an x402 client, then retry with the payment header
}

Python

import httpx
res = httpx.get("https://draconic21-x402-api.onrender.com/v1/email_validate")
if res.status_code == 402:
    accepts = res.json()["accepts"]
    # pay one of accepts[] via an x402 client, then retry with the payment header

Details

Provider: draconic21-x402-api.onrender.com
Endpoint: https://draconic21-x402-api.onrender.com/v1/email_validate
Machine-readable: /resources/36078.json