API Authorization

To access the ALTCHA API, you’ll need an API Key, which you can create free of charge using the API itself.

Note

Free API Keys are tied to a specific domain name and will only function on websites hosted on the provided domain name. The API verifies the Referer header, so ensure you always include a Referer even when sending requests from a server.

Using API Keys

After creating an API Key, include it with every API request using one of the following methods:

• As a URL parameter: ?apiKey=ckey_...
• As an HTTP header: Authorization: Bearer ckey_...

Troubleshooting

For assistance with authentication issues or API errors, consult the API errors documentation.