Agent Service · x402 · early usage

Validate an email address using syntax, MX, disposable-domain, role-account, and domain…

Validate an email address using syntax, MX, disposable-domain, role-account, and domain-risk checks. Returns structured validation data for agent workflows, signup hygiene, and lead-quality checks. Does not guarantee that an individual mailbox exists.

by agent-vending-production.up.railway.app · discovered, not yet claimed by its owner · updated 2026-10-06

30d calls6

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

Tags: email validate · email validation · validate email · email verification · email verify · bazaar

Call contract

Method: POST
Input: json
Output: json
Last paid call: 2026-10-06

Input example from Bazaar metadata

{
  "email": "[email protected]"
}

Output example

{
  "disposable_domain": false,
  "dmarc_present": true,
  "domain_exists": true,
  "email": "[email protected]",
  "mx_present": true,
  "note": "This assesses address/domain risk; it does not guarantee that a mailbox exists or will accept mail.",
  "reason_codes": [
    "role_address"
  ],
  "risk": "medium",
  "role_address": true,
  "spf_present": true,
  "syntax_valid": true
}

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/37812.json for the price and payment options.
Pay. Call GET https://agent-vending-production.up.railway.app/v1/email-risk. 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, and an x402-capable client (see the examples below). Call the endpoint unpaid first to see exactly what it asks for.

Pricing & payment

Price: $0.001 / request
Protocol: x402 v2
Auth: No account or API key. Pay per request.
Networks: Base
Demand: 6 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	$0.001	0x0b4242adf40726d9b09688030948176752d29924	300s

accepts[] (raw JSON)

[
  {
    "scheme": "exact",
    "network": "eip155:8453",
    "payTo": "0x0b4242adf40726d9b09688030948176752d29924",
    "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
    "amount": "1000",
    "amountUsd": 0.001,
    "maxTimeoutSeconds": 300
  }
]

Schemas

Output schema (JSON Schema)

{
  "properties": {
    "example": {
      "properties": {
        "disposable_domain": {
          "description": "True if domain is on a small known disposable list.",
          "type": "boolean"
        },
        "dmarc_present": {
          "description": "Whether _dmarc.<domain> has TXT records.",
          "type": "boolean"
        },
        "domain_exists": {
          "description": "Whether the domain resolves (A/AAAA/MX).",
          "type": "boolean"
        },
        "email": {
          "description": "Normalized email address assessed.",
          "type": "string"
        },
        "mx_present": {
          "description": "Whether MX records exist for the domain.",
          "type": "boolean"
        },
        "note": {
          "description": "Honesty note: does not prove mailbox existence.",
          "type": "string"
        },
        "reason_codes": {
          "description": "Machine-readable codes explaining the risk label.",
          "items": {
            "type": "string"
          },
          "type": "array"
        },
        "risk": {
          "description": "Aggregated risk label from the signals above.",
          "enum": [
            "low",
            "medium",
            "high"
          ],
          "type": "string"
        },
        "role_address": {
          "description": "True if local-part looks like a role account (info, admin, …).",
          "type": "boolean"
        },
        "spf_present": {
          "description": "Whether TXT records exist (proxy for SPF presence check).",
          "type": "boolean"
        },
        "syntax_valid": {
          "description": "Whether the address matches a basic RFC-ish syntax regex.",
          "type": "boolean"
        }
      },
      "type": "object"
    },
    "type": {
      "type": "string"
    }
  },
  "required": [
    "type"
  ],
  "type": "object"
}

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

{
  "example": {
    "disposable_domain": true,
    "dmarc_present": true,
    "domain_exists": true,
    "email": "string",
    "mx_present": true,
    "note": "string",
    "reason_codes": [
      "string"
    ],
    "risk": "low",
    "role_address": true,
    "spf_present": true,
    "syntax_valid": true
  },
  "type": "string"
}

Examples

curl

curl "https://agent-vending-production.up.railway.app/v1/email-risk"
# -> 402 Payment Required, accepts[] lists how to pay
# retry with a PAYMENT-SIGNATURE (or PAYMENT header) once paid

JavaScript

const res = await fetch("https://agent-vending-production.up.railway.app/v1/email-risk");
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://agent-vending-production.up.railway.app/v1/email-risk")
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: agent-vending-production.up.railway.app
Endpoint: https://agent-vending-production.up.railway.app/v1/email-risk
Machine-readable: /resources/37812.json