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ThinkFeel is available through the Curve Labs early access beta program.
1

Request access

Fill out the request access form with:
  • Your name and email
  • Company or project name
  • Intended use case and target audience
  • Expected usage volume
  • Desired persona characteristics
2

Join the onboarding call

The Curve Labs team reviews applications, typically within 2-5 days. After approval, the team schedules a 30-minute onboarding call to discuss your use case, craft a custom persona, define persona traits and communication style, whitelist your email for Playground access, and provide your unique personaId.
3

Create API keys

After onboarding, create API keys in one of these ways:
  • Use /keys in Playground for the browser UI
  • Run thinkfeel login --persona-id YOUR_THINKFEEL_PERSONA_ID for CLI setup
  • Use CLI + Agents for local login, profiles, non-interactive setup, and SKILL.md

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Install the SDK and CLI

npm i @curvelabs.org/thinkfeel

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Send your first request

curl -X POST https://playground.curvelabs.org/api/v1/generate \
  -H "Content-Type: application/json" \
  -H "x-api-key: YOUR_API_KEY_HERE" \
  -d '{
    "personaId": "YOUR_PERSONA_ID",
    "messages": [
      {
        "role": "user",
        "content": "Hello!"
      }
    ]
  }'

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What beta includes

Custom personas

Persona design is part of onboarding.

Jailbreak prevention

Personas are designed with explicit boundaries and safety behavior.

Near-cost beta pricing

Beta pricing stays close to the cost of the underlying models.

Direct support

Beta users get direct engineering support.
Ready to build? Start from Authentication, then choose either the ThinkFeel /generate endpoint or the OpenAI-compatible /completions endpoint.