Beauty & Personal Care · x402 · early usage

Use when you need to know if an email address is real and deliverable before signup, ou…

Use when you need to know if an email address is real and deliverable before signup, outreach or onboarding: syntax, live MX routing, 9,000+ disposable domains, role addresses, free providers, typo suggestions (gmial.com to gmail.com) and SPF/DMARC. One verdi…

by factline.dev · discovered, not yet claimed by its owner · updated 2026-10-12

30d calls6

30d payers3

MethodGET

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 · verification · validation · deliverability · disposable · bazaar · payment-identifier

Call contract

Method: GET
Input: query parameters
Output: json
Last paid call: 2026-10-12

Input example from Bazaar metadata

{
  "email": "[email protected]"
}

Output example

{
  "disposable": true,
  "domain": "gmial.com",
  "domain_security": {
    "dmarc_policy": null,
    "spf": false
  },
  "email": "[email protected]",
  "explain": {
    "disposable_list": "disposable-email-domains blocklist (CC0), 2026-10-07",
    "limits": "No SMTP mailbox probe: this confirms the domain can receive mail, not that this exact mailbox exists.",
    "verdict": "deliverable: domain receives mail and nothing suspicious; deliverable_role: same but a shared inbox; risky: disposable domain or likely typo; undeliverable: bad syntax or the domain cannot receive mail."
  },
  "free_provider": false,
  "mail_routing": {
    "accepts_mail": true,
    "domain_exists": true,
    "implicit_mx": true,
    "mx": [],
    "null_mx": false
  },
  "reasons": [
    "disposable (throwaway) email domain",
    "possible typo of gmail.com"
  ],
  "role_account": false,
  "source": "DNS via Cloudflare 1.1.1.1 (DNS-over-HTTPS); disposable-email-domains (CC0)",
  "suggestion": "[email protected]",
  "syntax_valid": 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/34918.json for the price and payment options.
Pay. Call GET https://factline.dev/v1/email/verify. 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: $0.002 / request
Protocol: x402 v2
Auth: No account or API key. Pay per request.
Networks: Base, Solana
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	$0.002	0xb58dd178abac67f6d4894437a7fc725cbddb2075	120s
exact	Solana solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp	USDC	$0.002	fyqifu7otDYanhqr84B9YzZfA5LwRTJ1uFLqDJinMTK	120s

accepts[] (raw JSON)

[
  {
    "scheme": "exact",
    "network": "eip155:8453",
    "payTo": "0xb58dd178abac67f6d4894437a7fc725cbddb2075",
    "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
    "amount": "2000",
    "amountUsd": 0.002,
    "maxTimeoutSeconds": 120
  },
  {
    "scheme": "exact",
    "network": "solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp",
    "payTo": "fyqifu7otDYanhqr84B9YzZfA5LwRTJ1uFLqDJinMTK",
    "asset": "EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v",
    "amount": "2000",
    "amountUsd": 0.002,
    "maxTimeoutSeconds": 120
  }
]

Schemas

Output schema (JSON Schema)

{
  "properties": {
    "example": {
      "type": "object"
    },
    "type": {
      "type": "string"
    }
  },
  "required": [
    "type"
  ],
  "type": "object"
}

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

{
  "example": {},
  "type": "string"
}

Examples

curl

curl "https://factline.dev/v1/email/verify"
# -> 402 Payment Required, accepts[] lists how to pay
# retry with a PAYMENT-SIGNATURE (or PAYMENT header) once paid

JavaScript

const res = await fetch("https://factline.dev/v1/email/verify");
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://factline.dev/v1/email/verify")
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: factline.dev
Endpoint: https://factline.dev/v1/email/verify
Machine-readable: /resources/34918.json