Number of server requests
A single user (API key owner) can send up to 10 requests per second.
If this threshold is exceeded, the API key is blocked. The server returns the error “ Rate limit exceeded ”. API access will be restored automatically in one second.
API access requires a key. You can get a free API key in the Developer's Dashboard.
Site owners can restrict Validator API access to their websites:
Prohibit downloading pages in the robots.txt file. The server returns the error “ IO error while downloading document ”.
Add special semantic markup to a page. In this case, the page is indexed by search robots.
<meta property="ya:disallow_api" content="semantic"/>
The server returns the error “ Validation is prohibited by site owner ”.