URL Health Check

Check whether a URL is alive: status code, response time, redirects, SSL validity, content type and server.

Pay by wallet (x402) url-health-check

Example

Input

{
  "url": "https://strale.dev"
}

Answer

{
  "url": "https://strale.dev",
  "is_up": true,
  "server": "cloudflare",
  "final_url": "https://strale.dev",
  "ssl_valid": true,
  "status_code": 200,
  "content_type": "text/html",
  "redirect_chain": [],
  "response_time_ms": 37
}

Inputs

Field	Type	Required	What it is
`url`	string	Yes	URL to check
`timeout`	integer	No	—
`follow_redirects`	boolean	No	—

Output fields

How reliably each field appears in a successful answer.

Field	Type	Appears
`is_up`	boolean	Always (present in every successful answer)
`ssl_valid`	boolean	Always (present in every successful answer)
`status_code`	integer	Always (present in every successful answer)
`redirect_chain`	array	Always (present in every successful answer)
`response_time_ms`	integer	Always (present in every successful answer)

How to call it

The same tool through each route. MCP clients reach it through Strale’s server at https://api.strale.io/mcp; the call below is what the agent sends.

# Needs an API key. max_price_cents caps what this call may cost.
curl -X POST https://api.strale.io/v1/do \
  -H "Authorization: Bearer $STRALE_API_KEY" \
  -H 'Content-Type: application/json' \
  -d '{
    "capability_slug": "url-health-check",
    "inputs": {
      "url": "https://strale.dev"
    },
    "max_price_cents": 3
  }'

{
  "tool": "strale_execute",
  "arguments": {
    "slug": "url-health-check",
    "inputs": {
      "url": "https://strale.dev"
    },
    "max_price_cents": 3
  }
}

import { Strale } from "straleio";

const strale = new Strale({ apiKey: process.env.STRALE_API_KEY! });
const result = await strale.do({
  capability_slug: "url-health-check",
  inputs: {
    "url": "https://strale.dev"
  },
  max_price_cents: 3,
});

import os
from straleio import Strale, DoRequest

strale = Strale(api_key=os.environ["STRALE_API_KEY"])
result = strale.do(DoRequest(
    capability_slug="url-health-check",
    inputs={
        "url": "https://strale.dev",
    },
    max_price_cents=3,
))

# No account. The first request answers 402 with the price in USDC;
# an x402 client pays it from your wallet and repeats the request.
curl -i 'https://api.strale.io/x402/v2/url-health-check?url=https%3A%2F%2Fstrale.dev'

Limitations

Page content and rendering are not checked
Checks HTTP response status and basic connectivity — does not assess content correctness or page rendering
What to do instead: Use page-exists for content-level existence (soft-404 detection), or screenshot-url for visual verification

Bundled checks that include it

Page SEO Check €0.30