Tool detail

HTTP Header Checker

Fetches one URL and returns its status code, redirect chain, response headers, and response time.

Categories: Website analysis

Use when

inspect response headers of a web page
check which security headers a site is missing
see the full redirect chain for a URL

Not for

not for retrieving page body content
not for checking more than one URL per call

Inputs

POST JSON body: { url: string } (required), method: 'GET'|'HEAD' (optional), follow_redirects: boolean (optional)

Admitted input schema

{
  "type": "object",
  "properties": {
    "follow_redirects": {
      "type": "boolean",
      "description": "Whether to follow redirects to their final destination or stop at the first one"
    },
    "method": {
      "type": "string",
      "minLength": 0,
      "maxLength": 4096,
      "description": "Either GET or HEAD; GET fetches the page normally, HEAD only asks for headers without the body"
    },
    "url": {
      "type": "string",
      "minLength": 0,
      "maxLength": 4096,
      "description": "The full web address to check, including http:// or https://"
    }
  },
  "required": [
    "url"
  ],
  "additionalProperties": false
}

Endpoint

Method: POST
URL: https://http-header-checker.underscoredone.com/check

Payment

Protocol: x402
Listed price: 0.01 USDC per call on Base
Payment method: exact
Network: eip155:8453
Asset: 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913

Listed terms are catalog metadata. The caller supplies inputs and calls the tool outside Onelayer. If payment is required, the caller uses a compatible wallet to pay.

Source

Directory: Coinbase x402 Bazaar
Record: POST https://http-header-checker.underscoredone.com/check
Retrieved: 2026-09-30T20:37:07.382Z
Catalog file SHA-256: 6837ccddf886f0007cf3727ea9d27faaa5047b51b4f425345c554ce1c271a524
Catalog built: 2026-09-30T22:31:58.034Z