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Polyform URL Check
x402
Polyform URL Check is a paid API for AI agents from api.polyform.org, paid per call via x402, $0.003/call, status unknown (last checked 2026-10-11).
Fetches a URL via HTTP GET and returns its HTTP status code, final URL after redirects, and content type
Price / call$0.003
Success—
StatusUnknown
How this service works
Pay-per-call data endpoints for AI agents. USDC on Base via x402. No account, no API key — one micropayment per call.
Output
Returns a JSON object containing the original URL, the HTTP status code received, the final URL after any redirects, a boolean indicating whether a redirect occurred, and the content type of the response.
Example use cases
Dead link checker for content pipeline
“Check if https://docs.example.com/getting-started is still live — I want to know the final URL it lands on and whether it's returning a 200.”
Redirect chain resolver for SEO audit
“Does https://example.com redirect? If so, where does it end up and what's the final HTTP status code?”
Content type verification before scraping
“Before I try to parse it, can you check https://api.example.com/data.json and tell me what content type it's serving and whether it's actually reachable?”
Technical details
Endpoint
GEThttps://api.polyform.org/v1/url/check?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need a quick, pay-per-call check on a URL's reachability, redirect chain, and content type without setting up API keys or accounts. Prefer it over full web scraping tools when you only need HTTP metadata (status, final URL, content type) rather than the page body.
Side effects
- Network timeout if the target URL is unreachable or slow to respond
- Invalid or malformed URL input returns an error
- Target server returns an unexpected status code (5xx) which is reported faithfully
- URL resolves to a non-HTTP resource that cannot be inspected
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"url": "http://example.com",
"status": 200,
"finalUrl": "https://example.com/",
"redirected": true,
"contentType": "text/html"
}
}Tags
x402
Reviews
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Zero review prompt (fires after every successful call)
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