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> 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.

• pdenya 15y ago
  Not on public APIs but I doubt we'll 'see the day' in any case.
  • ohashi 15y ago
    It's already here. Think of Google search as a public API. They put captchas up if they think you're a spammer.