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Find answers across identity, developers, billing, and security.
Getting Started
New to KAKR? Start here.
- Why passwordless: the problem PTERI is solving
- Creating a developer account and your first API key
Identity & MFA
How passwordless sign-in, MFA, and device verification work.
- How authentication works
- MFA and device verification
AI Agent Security
Giving AI agents their own verifiable, scoped identity and authority.
- PTERI's model for AI agent authority
MCP Security
PTERI Intelligence's planned tool-namespace model for MCP clients.
- PTERI Intelligence and MCP
API & Integrations
Quickstart, authentication headers, SDKs, response formats, and connecting KAKR to your app.
- Getting started with the API
- SDKs and supported languages
PTERI
What PTERI is and how it fits into KAKR's identity and authorization platform.
- What is PTERI?
- The PTERI Wallet app
Troubleshooting
Common API and authentication errors and how to resolve them.
- Common API errors and how to resolve them
- "Challenge expired" or "invalid signature" during sign-in
Security & Trust
What KAKR protects against, key custody, service status, and reporting a vulnerability.
- PTERI's threat model — what's protected and what isn't
- Key custody and biometrics — who holds your keys?
Account & Enterprise Support
Managing your account, recovering access, and enterprise plans and support.
- Setting up and managing your account
- Recovering account access
Billing & Plans
Plan tiers, usage limits, and managing your subscription.
- Plan tiers and usage limits
- Managing, upgrading, or cancelling your subscription
Start here
What is PTERI?
Identity and authorization for humans and AI agents — no passwords, no shared secrets.
Setting up and managing your account
Create a free account at pteri.org — no credit card needed — then manage everything from your Developer Dashboard.
How authentication works
A signed challenge from your device key, gated by biometrics — not a password.
Getting started with the API
Your first few calls: create an identity, create an address, check a balance.
Still need help?
Kai answers instantly from this knowledge base. If it can't resolve your issue, it hands you to the Kakr Labs support team.