aiagents.org

System One API

Hosted models that classify, score and gate decisions for agents.

  • AI tool
  • Freemium

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Pricing

100 free credits on sign-up; prepaid packs $5.99 (5,000 credits), $19.99 (20,000) or $99.99 (120,000); credits do not expire.

Overview

System One API is a hosted API that returns structured decisions for software and AI agents. You send some context and one or more questions, and its own models answer each as a choice between options with probabilities, a score, or a yes/no check, leaving your code to decide what to do. It has a playground, documentation and an open-source SDK, and you are not billed for calls that fail.

Key features

  • Choice, Score and yes/no question types
  • Several questions per request
  • Playground and SDK
  • Prepaid credits, failed calls free

Use cases

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Last updated 2026-10-25

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