Agent Service · x402 · active demand

Audit a URL's HTTP security headers over a single body-free (HEAD) request

Audit a URL's HTTP security headers over a single body-free (HEAD) request. Grades Strict-Transport-Security, Content-Security-Policy, X-Frame-Options, X-Content-Type-Options, Referrer-Policy and Permissions-Policy, flags information-leak headers (Server, X-P…

by headers.use.x402atlas.com · discovered, not yet claimed by its owner · updated 2026-10-12

30d calls26

30d payers12

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: http · headers · security · hsts · csp · bazaar

Call contract

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

Input example from Bazaar metadata

{
  "url": "https://example.com/"
}

Output example

{
  "headers": {
    "content_security_policy": "default-src 'self'",
    "permissions_policy": null,
    "referrer_policy": "strict-origin-when-cross-origin",
    "server": null,
    "strict_transport_security": {
      "include_subdomains": true,
      "max_age": 31536000,
      "preload": false,
      "value": "max-age=31536000; includeSubDomains"
    },
    "x_content_type_options": "nosniff",
    "x_frame_options": "DENY",
    "x_powered_by": null
  },
  "queried_at": "2026-07-03T12:00:00Z",
  "status_code": 200,
  "url": "https://example.com/",
  "warnings": [
    "no Permissions-Policy header (powerful browser features are not restricted)"
  ]
}

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/26528.json for the price and payment options.
Pay. Call GET https://headers.use.x402atlas.com/. 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, Polygon, Arbitrum One, 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: $0.01 / request
Protocol: x402 v2
Auth: No account or API key. Pay per request.
Networks: Base, Polygon, Arbitrum One, Solana
Demand: 26 calls · 12 unique payers in 30d (public x402 Bazaar data)

x402 payment requirements

Scheme	Network	Asset	Amount	Pay to	Timeout
exact	Base eip155:8453	USDC	$0.01	0x7f8043c400799643bcb62B41B84b297a8Ecb7b9c	300s
exact	Polygon eip155:137	USDC	$0.01	0x7f8043c400799643bcb62B41B84b297a8Ecb7b9c	300s
exact	Arbitrum One eip155:42161	USDC	$0.01	0x7f8043c400799643bcb62B41B84b297a8Ecb7b9c	300s
exact	Solana solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp	USDC	$0.01	ASt6xvRyQ7ntERsmcYVMdLqZvz1GEN8Fzexzq62tXrNQ	300s

accepts[] (raw JSON)

[
  {
    "scheme": "exact",
    "network": "eip155:8453",
    "payTo": "0x7f8043c400799643bcb62B41B84b297a8Ecb7b9c",
    "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
    "amount": "10000",
    "amountUsd": 0.01,
    "maxTimeoutSeconds": 300
  },
  {
    "scheme": "exact",
    "network": "eip155:137",
    "payTo": "0x7f8043c400799643bcb62B41B84b297a8Ecb7b9c",
    "asset": "0x3c499c542cEF5E3811e1192ce70d8cC03d5c3359",
    "amount": "10000",
    "amountUsd": 0.01,
    "maxTimeoutSeconds": 300
  },
  {
    "scheme": "exact",
    "network": "eip155:42161",
    "payTo": "0x7f8043c400799643bcb62B41B84b297a8Ecb7b9c",
    "asset": "0xaf88d065e77c8cC2239327C5EDb3A432268e5831",
    "amount": "10000",
    "amountUsd": 0.01,
    "maxTimeoutSeconds": 300
  },
  {
    "scheme": "exact",
    "network": "solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp",
    "payTo": "ASt6xvRyQ7ntERsmcYVMdLqZvz1GEN8Fzexzq62tXrNQ",
    "asset": "EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v",
    "amount": "10000",
    "amountUsd": 0.01,
    "maxTimeoutSeconds": 300
  }
]

Schemas

Output schema (JSON Schema)

{
  "properties": {
    "example": {
      "properties": {
        "headers": {
          "description": "Graded, normalized security headers. Each field is null when the header is absent from the response",
          "properties": {
            "content_security_policy": {
              "type": [
                "string",
                "null"
              ]
            },
            "permissions_policy": {
              "type": [
                "string",
                "null"
              ]
            },
            "referrer_policy": {
              "type": [
                "string",
                "null"
              ]
            },
            "server": {
              "description": "Server header value, if disclosed by the target",
              "type": [
                "string",
                "null"
              ]
            },
            "strict_transport_security": {
              "properties": {
                "include_subdomains": {
                  "type": "boolean"
                },
                "max_age": {
                  "description": "Parsed max-age in seconds; null if absent or unparseable",
                  "type": [
                    "integer",
                    "null"
                  ]
                },
                "preload": {
                  "type": "boolean"
                },
                "value": {
                  "description": "Raw Strict-Transport-Security header value",
                  "type": "string"
                }
              },
              "type": [
                "object",
                "null"
              ]
            },
            "x_content_type_options": {
              "type": [
                "string",
                "null"
              ]
            },
            "x_frame_options": {
              "type": [
                "string",
                "null"
              ]
            },
            "x_powered_by": {
              "description": "X-Powered-By header value, if disclosed by the target",
              "type": [
                "string",
                "null"
              ]
            }
          },
          "type": "object"
        },
        "queried_at": {
          "description": "UTC timestamp the audit was performed",
          "format": "date-time",
          "type": "string"
        },
        "status_code": {
          "description": "HTTP status code returned by the target for the HEAD request",
          "type": "integer"
        },
        "url": {
          "description": "The audited URL, exactly as given",
          "type": "string"
        },
        "warnings": {
          "description": "Human-readable posture advisories, e.g. missing or weak headers",
          "items": {
            "type": "string"
          },
          "type": "array"
        }
      },
      "required": [
        "url",
        "status_code",
        "queried_at",
        "headers",
        "warnings"
      ],
      "type": "object"
    },
    "type": {
      "type": "string"
    }
  },
  "required": [
    "type"
  ],
  "type": "object"
}

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

{
  "example": {
    "headers": {
      "content_security_policy": "string",
      "permissions_policy": "string",
      "referrer_policy": "string",
      "server": "string",
      "strict_transport_security": {
        "include_subdomains": true,
        "max_age": 0,
        "preload": true,
        "value": "string"
      },
      "x_content_type_options": "string",
      "x_frame_options": "string",
      "x_powered_by": "string"
    },
    "queried_at": "2026-01-01T00:00:00Z",
    "status_code": 0,
    "url": "string",
    "warnings": [
      "string"
    ]
  },
  "type": "string"
}

Examples

curl

curl -X GET 'https://headers.use.x402atlas.com/'
# -> 402 Payment Required; read PAYMENT-REQUIRED
# retry the identical request with PAYMENT-SIGNATURE

JavaScript

const res = await fetch("https://headers.use.x402atlas.com/", {
  "method": "GET"
});
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.request("GET", "https://headers.use.x402atlas.com/")
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: headers.use.x402atlas.com
Endpoint: https://headers.use.x402atlas.com/
Machine-readable: /resources/26528.json