Validate email format, disposable-domain heuristics, and live DNS MX records via DoH for o

[
  {
    "scheme": "exact",
    "network": "eip155:8453",
    "payTo": "0xc648116b5deBE4AF7D78838AA468d07e0A9Ab697",
    "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
    "amount": "4000",
    "maxTimeoutSeconds": 120
  }
]

{
  "bazaar": {
    "info": {
      "input": {
        "method": "GET",
        "pathParams": {},
        "queryParams": {
          "email": "[email protected]"
        },
        "type": "http"
      },
      "output": {
        "example": {
          "email": "[email protected]",
          "has_mx": true,
          "mx": [
            {
              "host": "gmail-smtp-in.l.google.com",
              "priority": 5
            }
          ],
          "ok": true,
          "service": "email-validate",
          "valid_format": true
        },
        "type": "json"
      }
    },
    "routeTemplate": "/api/v/email-validate",
    "schema": {
      "$schema": "https://json-schema.org/draft/2020-12/schema",
      "properties": {
        "input": {
          "additionalProperties": false,
          "properties": {
            "method": {
              "enum": [
                "GET"
              ],
              "type": "string"
            },
            "pathParams": {
              "type": "object"
            },
            "queryParams": {
              "additionalProperties": false,
              "properties": {
                "email": {
                  "description": "Email address to validate",
                  "type": "string"
                }
              },
              "required": [
                "email"
              ],
              "type": "object"
            },
            "type": {
              "const": "http",
              "type": "string"
            }
          },
          "required": [
            "type",
            "method"
          ],
          "type": "object"
        },
        "output": {
          "properties": {
            "example": {
              "properties": {
                "email": {
                  "type": "string"
                },
                "has_mx": {
                  "type": "boolean"
                },
                "mx": {
                  "type": "array"
                },
                "ok": {
                  "type": "boolean"
                },
                "service": {
                  "type": "string"
                },
                "valid_format": {
                  "type": "boolean"
                }
              },
              "type": "object"
            },
            "type": {
              "type": "string"
            }
          },
          "required": [
            "type"
          ],
          "type": "object"
        }
      },
      "required": [
        "input"
      ],
      "type": "object"
    }
  }
}

curl "https://vendsdk.com/api/v/email-validate"
# -> 402 Payment Required, accepts[] lists how to pay
# retry with a PAYMENT-SIGNATURE (or PAYMENT header) once paid

const res = await fetch("https://vendsdk.com/api/v/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
}

import httpx
res = httpx.get("https://vendsdk.com/api/v/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