DNS MX record lookup — a domain's mail servers with their hostnames and priorities as stru

[
  {
    "scheme": "exact",
    "network": "eip155:8453",
    "payTo": "0x446e51DeAb3aE656C99E65369e8eF1148d23d7f7",
    "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
    "amount": "5000",
    "maxTimeoutSeconds": 300
  },
  {
    "scheme": "exact",
    "network": "eip155:137",
    "payTo": "0x446e51DeAb3aE656C99E65369e8eF1148d23d7f7",
    "asset": "0x3c499c542cEF5E3811e1192ce70d8cC03d5c3359",
    "amount": "5000",
    "maxTimeoutSeconds": 300
  },
  {
    "scheme": "exact",
    "network": "eip155:42161",
    "payTo": "0x446e51DeAb3aE656C99E65369e8eF1148d23d7f7",
    "asset": "0xaf88d065e77c8cC2239327C5EDb3A432268e5831",
    "amount": "5000",
    "maxTimeoutSeconds": 300
  },
  {
    "scheme": "exact",
    "network": "solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp",
    "payTo": "ASt6xvRyQ7ntERsmcYVMdLqZvz1GEN8Fzexzq62tXrNQ",
    "asset": "EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v",
    "amount": "5000",
    "maxTimeoutSeconds": 300
  }
]

{
  "bazaar": {
    "category": "domain-intelligence",
    "info": {
      "input": {
        "method": "GET",
        "queryParams": {
          "host": "example.com"
        },
        "type": "http"
      },
      "output": {
        "example": {
          "host": "example.com",
          "queried_at": "2026-06-05T12:00:00Z",
          "records": [
            {
              "host": "mail.example.com.",
              "pref": 10
            }
          ]
        },
        "type": "json"
      }
    },
    "schema": {
      "$schema": "https://json-schema.org/draft/2020-12/schema",
      "properties": {
        "input": {
          "additionalProperties": false,
          "properties": {
            "method": {
              "enum": [
                "GET"
              ],
              "type": "string"
            },
            "queryParams": {
              "properties": {
                "host": {
                  "description": "Bare hostname to resolve (not an IP literal, not localhost, not under a reserved suffix like .local/.internal)",
                  "maxLength": 253,
                  "minLength": 1,
                  "type": "string"
                }
              },
              "required": [
                "host"
              ],
              "type": "object"
            },
            "type": {
              "const": "http",
              "type": "string"
            }
          },
          "required": [
            "type",
            "method"
          ],
          "type": "object"
        },
        "output": {
          "properties": {
            "example": {
              "properties": {
                "host": {
                  "description": "The queried hostname",
                  "type": "string"
                },
                "queried_at": {
                  "description": "UTC timestamp of the lookup",
                  "format": "date-time",
                  "type": "string"
                },
                "records": {
                  "items": {
                    "properties": {
                      "host": {
                        "description": "Mail server hostname, typically with a trailing dot",
                        "type": "string"
                      },
                      "pref": {
                        "description": "MX preference; lower values are tried first",
                        "type": "integer"
                      }
                    },
                    "required": [
                      "host",
                      "pref"
                    ],
                    "type": "object"
                  },
                  "type": "array"
                }
              },
              "required": [
                "host",
                "records",
                "queried_at"
              ],
              "type": "object"
            },
            "type": {
              "type": "string"
            }
          },
          "required": [
            "type"
          ],
          "type": "object"
        }
      },
      "required": [
        "input"
      ],
      "type": "object"
    },
    "tags": [
      "dns",
      "mx",
      "mail-server",
      "email",
      "deliverability",
      "domain",
      "lookup"
    ]
  }
}

curl "https://dns.use.x402atlas.com/mx"
# -> 402 Payment Required, accepts[] lists how to pay
# retry with a PAYMENT-SIGNATURE (or PAYMENT header) once paid

const res = await fetch("https://dns.use.x402atlas.com/mx");
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://dns.use.x402atlas.com/mx")
if res.status_code == 402:
    accepts = res.json()["accepts"]
    # pay one of accepts[] via an x402 client, then retry with the payment header