Uptime Check

Check whether a URL is up: status code, latency, redirects, TLS and server headers.

Pay by wallet (x402) uptime-check

Example

Example answer

{
  "tls": true,
  "url": "https://example.com",
  "error": "fetch failed",
  "status": "down",
  "checked_at": "2026-03-09T20:03:13.819Z",
  "latency_ms": 22,
  "status_code": null
}

Inputs

Field	Type	Required	What it is
`url`	string	Yes	—
`method`	string	No	—
`timeout_ms`	integer	No	—

Output fields

How reliably each field appears in a successful answer.

Field	Type	Appears
`status`	string	Always (present in every successful answer)
`latency_ms`	integer	Always (present in every successful answer)
`redirected`	boolean	Always (present in every successful answer)
`status_code`	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": "uptime-check",
    "inputs": {
      "url": "https://strale.dev"
    },
    "max_price_cents": 2
  }'

{
  "tool": "strale_execute",
  "arguments": {
    "slug": "uptime-check",
    "inputs": {
      "url": "https://strale.dev"
    },
    "max_price_cents": 2
  }
}

import { Strale } from "straleio";

const strale = new Strale({ apiKey: process.env.STRALE_API_KEY! });
const result = await strale.do({
  capability_slug: "uptime-check",
  inputs: {
    "url": "https://strale.dev"
  },
  max_price_cents: 2,
});

import os
from straleio import Strale, DoRequest

strale = Strale(api_key=os.environ["STRALE_API_KEY"])
result = strale.do(DoRequest(
    capability_slug="uptime-check",
    inputs={
        "url": "https://strale.dev",
    },
    max_price_cents=2,
))

# 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/uptime-check?url=https%3A%2F%2Fstrale.dev'

Limitations

One check does not measure historical or regional uptime
Single point-in-time check from one server location — does not represent historical uptime or multi-region availability
What to do instead: Schedule periodic checks and compute uptime percentage over time rather than relying on a single probe
HTTP 200 can mask missing pages
Only the HTTP status code is inspected. A removed listing or soft-404 page served with HTTP 200 (or even a literal 404 response) is reported as status "up" — this capability answers "does the server respond?", not "does this page still exist?".
What to do instead: Use page-exists to check whether a specific page still resolves to real content.