Paste your own key
Create a key in your OpenRouter account and paste the complete value here. Use “Check key only” to verify authentication without sending a prompt to a model. A successful check confirms that OpenRouter accepts the key.
DEVELOPER TOOLS / API CONNECTIVITY
OpenRouter API Tester
A quick way to check your API key and make a real model call. Paste your key, send a short message, and see exactly what comes back.
Configure request
Test result
API key authenticationNot tested
Model responseNot tested
- HTTP status
- —
- Total time
- —
- Total tokens
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Your response will appear here
Run a test to see the model reply, connection details, or a helpful error message.
Results stay in this tab only.
Your browserDirect HTTPS requestOpenRouter API
From API key to first response
No SDK, terminal, or installation required.
Make a small test call
Start with the free model router and the short default message. “Send test request” first checks your key, then sends one chat completion request. To test a particular integration, choose a custom model ID from OpenRouter’s catalog.
Understand the result
Read the model reply or switch to JSON for the response body. The status code belongs to the latest API response; total time covers the whole test. Token usage includes input and output when reported. Clear the session when finished.
PRIVACY BY DESIGN
A webpage, with no testing backend
This is a static browser utility for convenient OpenRouter API
testing. Caitty serves the page files, but does not receive or relay
your API key, prompt, or API response. Requests go directly from
your browser to https://openrouter.ai/api/v1/.
- Your key is held only in the current page’s memory and input field. This tool never writes it to localStorage, sessionStorage, cookies, a URL, or a database.
- This page is supported by Google AdSense ads only. It does not include Google Analytics or other standalone analytics. Our testing code does not send your key, prompt, or response to the advertising service.
- Reloading, leaving the page, or choosing “Clear session” removes the key and results from this tool. Copying a result is optional; recognizable OpenRouter keys are redacted from displayed responses.
Ads load third-party scripts. Google and its advertising partners may use cookies or similar technologies to serve and measure ads. This is not a claim that the page has no third-party requests or tracking. See Google’s advertising privacy information.
OpenRouter receives your key to authenticate the request and routes the prompt to a model provider. Their privacy policies still apply. Browser extensions and your device are outside this page’s control, so no webpage can promise absolute security. Use a trusted browser and a limited testing key.
You can inspect this page’s request code and check the destination in your browser’s Network panel. This tool is independent of OpenRouter and is intended for quick connection checks.
TROUBLESHOOTING
What does an API error mean?
| Status | What to check |
|---|---|
| 400 / 404 | Check the model ID and request settings. The selected model may have changed or become unavailable. |
| 401 | OpenRouter rejected authentication. Check for an incomplete, mistyped, expired, or revoked key. |
| 402 | Review account credits, the key’s spending limit, and in-flight request budgets. A smaller token limit may help. |
| 403 | Check account permissions, model access, regional restrictions, or content rules. |
| 429 | Wait before retrying. Free models and providers have request limits, even when a key is valid. |
| 5xx | OpenRouter or a model provider may be temporarily unavailable. Check service status or try another model. |
| Network | A network, VPN, extension, or CORS restriction can prevent the browser from reading a response. No HTTP response does not prove the key is invalid. |
The test stops waiting after 60 seconds. Cancelling a request does not guarantee that the provider stops processing it or reverses any charge.
Before you test
Does a valid key guarantee that a model call will work?
No. Authentication and model generation are separate checks. A key can be valid while a call fails because of account credits, model permissions, rate limits, or provider availability. This tester keeps both results visible so you can tell where the request stopped.
Is the OpenRouter API test free?
Caitty does not charge for this tool. The default
openrouter/free router selects a free model, subject to
OpenRouter’s availability and limits. A custom model can incur
charges on your OpenRouter account. “Check key only” does not
request a model generation. See the
official free router guide
for details.
Why might a successful response contain no text?
Some models spend their output budget on reasoning before producing visible text. A short token limit can therefore return an empty answer or a response with a length finish reason. This page identifies those results separately; increase the token limit or try another model to check the visible output.
Is this a chat app or a performance benchmark?
No. Each test sends one message and keeps no conversation history. Timing includes your network connection, key validation, routing, and generation, so it is useful for basic troubleshooting rather than comparing model speed. Consult the OpenRouter quickstart and API limits documentation when integrating an application.