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PapaCasper CORS Policy Check
x402
PapaCasper CORS Policy Check is a paid API for AI agents from papacasper.com, paid per call via x402, $0.01/call, status unknown (last checked 2026-09-14).
Probes a given URL and returns its CORS (Cross-Origin Resource Sharing) policy configuration and headers
Price / call$0.01
Success—
StatusUnknown
How this service works
A hosted MCP server exposing utility tools any AI agent can call over HTTP — page-to-markdown, SEO audits, robots/sitemap checks, and more.
Output
Returns an object describing the CORS policy of the probed URL, including response headers such as Access-Control-Allow-Origin, Access-Control-Allow-Methods, Access-Control-Allow-Headers, and other CORS-related configuration details observed from the server's response.
Example use cases
Debugging cross-origin API access
“I'm getting CORS errors when my frontend tries to call https://api.myservice.com/data — can you check what CORS headers that endpoint returns so I can figure out what's blocking it?”
Security audit of third-party API
“Before we integrate with https://partner-api.com/v1/endpoint, can you inspect its CORS policy to see if it's overly permissive — like if it allows any origin?”
Verifying CORS fix after deployment
“We just pushed a fix to enable CORS on https://staging.ourapp.com/api/users — can you probe that URL and confirm it's now returning the correct Access-Control-Allow-Origin headers?”
Technical details
Endpoint
POSThttps://papacasper.com/mcp/pay/cors_policy_checkWhen to prefer
Use this endpoint when you need a quick, hosted probe of a URL's CORS configuration without running your own tooling. It's ideal for agents that need to audit, debug, or validate CORS policies as part of a web security check, integration readiness assessment, or deployment verification workflow. Prefer it over manual header inspection when operating in an automated pipeline.
Side effects
- URL is unreachable or returns a network error — empty or error object returned
- URL does not set any CORS headers — result will indicate absence of CORS policy
- Invalid or malformed URL provided — request may fail with a validation error
- Target server blocks automated requests or returns 403 — may yield incomplete CORS data
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| urlrequired | string | The URL to probe |
Output
Schema · Response
{
"type": "object"
}Tags
x402
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