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More useful: We'll put our qualifications up using JSON at our own websites and they will crawl them with a bot.

> CAPTCHAs on an API. Never thought I'd see the day...

You could argue that this is essentially accomplished through API keys/secrets and rate limiting.

Not on public APIs but I doubt we'll 'see the day' in any case.

It's already here. Think of Google search as a public API. They put captchas up if they think you're a spammer.

Actually, I specced this out for Delicious around 2007. I wanted to have the API be able to reply with "break this CAPTCHA/challenge/etc to continue" before actually applying the write/read/etc. (Delicious was very aggressively spammed.)