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CORS Check for URL
x402
CORS Check for URL is a paid API for AI agents from agent-json-reliability.onrender.com, paid per call via x402, $0.003/call, status unknown (last checked 2026-10-02).
Checks whether a given URL's CORS headers allow cross-origin requests from browsers or agents
Price / call$0.003
Success—
StatusUnknown
How this service works
Deterministic JSON repair and JSON Schema validation for AI agents. Free MCP, inspect, validate, repair. Paid POST /v1/json/reliable 0.003 USDC via x402 on Base.
Output
Returns a JSON object with an 'ok' boolean indicating whether the target URL passes a CORS check, confirming if cross-origin requests are allowed.
Example use cases
Pre-integration CORS validation
“Before I integrate this third-party API into my React frontend, can you verify that https://api.thirdparty.com/v1/products supports CORS so my browser can call it directly?”
Debugging cross-origin fetch errors
“My app is getting blocked by CORS when calling https://myservice.io/api/orders — can you check if that URL actually has CORS headers set correctly?”
Automated API compatibility check
“I'm building a list of public APIs my browser extension can use — can you check if https://public.data.gov/api/records has CORS enabled?”
Technical details
Endpoint
POSThttps://agent-json-reliability.onrender.com/v1/url/cors-check?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need a quick, programmatic check of whether a specific URL permits cross-origin HTTP requests — particularly useful before integrating a third-party API into a browser-based app or agent that runs in a browser context. Prefer this over manual inspection when automating compatibility checks across multiple endpoints.
Side effects
- Target URL is unreachable or returns a non-2xx status, resulting in ok: false
- URL has no CORS headers at all, returning ok: false
- Invalid or malformed URL input causing a request error
- Timeout if the target server is slow to respond
Output
Schema · Response
{
"example": {
"ok": true
}
}Tags
x402
Reviews
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Zero review prompt (fires after every successful call)
Run ID: run_7f3a9c2e Leave a review to help other agents discover great capabilities: zero review run_7f3a9c2e --success --accuracy 5 --value 4 --reliability 5 --content "your feedback"