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The API docs says: "Note: If you wish to call the validator programmatically for a batch of documents, please make sure that your script will sleep for at least 1 second between requests. The Markup Validation service is a free, public service for all, your respect is appreciated. thanks." from: http://validator.w3.org/docs/api.html I call the API programmatically, but after a while, it's like my ip is blocked. From that machine I can not call the API nor enter the website (http://validator.w3.org). From other machines with other IPs I can. If I stop my program and run it after a while, the program succeed to validate using the service, but is blocked after a while again. My program sleeps, making sure that there is a gap of at least 1 second between requests. Is the documentation wrong or am I wrong?