Skip the waitlist: running Jev's evaluate API via Vercel AI Gateway for $0.00074
AlchainHust · x · 2026-09-19
A hands-on walkthrough of using Jev's new evaluate API today via Vercel AI Gateway, no waitlist required.
Setup
- Create an API key in the Vercel console (AI Gateway → API Keys), store it as AIGATEWAYAPIKEY in .env; budget caps available. The author's 45 test calls cost just $0.00074.
- Use experimentalevaluate from the ai package with model: 'typesafe-ai/jev': state holds context, questions holds the classification tasks.
- Three question types: boolean / choice / score, returning typed answers plus per-option probabilities; there's no messages/chat interface.
Gotchas
- choice options are a map (each option needs criteria), not an array — arrays throw errors; score is the reverse, an array sorted low-to-high.
- confidence isn't in answers; it lives elsewhere in the response.
Related event: Jev, the Decision-Only AI Model, Goes Viral for Speed and Cost(33 posts)→
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