Grok's API "free tier" is unusual enough to describe precisely: xAI offers $150/month in credits to teams that opt into data sharing — your API prompts and completions become training data, and you get paid in compute.
That's a different deal from every other free tier, where the quota is marketing spend. Here the quota is procurement: your production traffic has training value, and $150/month is the price they put on it.
Which makes the decision framework unusually clean. Generic traffic (public data, synthetic workloads, testing)? The trade is nearly free money. Anything with user data, proprietary prompts, or contractual confidentiality? The credits are irrelevant because the sharing is disqualifying. The mistake is treating it as a normal free tier and discovering the terms later.
The current terms, caps and what "sharing" covers: https://toolfreebie.com/grok-api-free-credits/
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