Foundations
AI assistant vs AI agent: what's the difference?
An assistant works with you; an agent works for you. A side-by-side on how they differ, when to use each, and how they compose on Sigrix.
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A working library for people building, buying, and selling AI blocks. Practical writing, no fluff—read what's relevant, skip the rest.
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Foundations
What is an AI agent?
An AI agent is an AI that completes a task for you autonomously — what it is, how it works, how it differs from an assistant, and how agents work on Sigrix.
Foundations
What is an AI assistant?
An AI assistant is a conversational AI you work with turn by turn — what it is, how it works, how it differs from an agent, and how assistants work on Sigrix.
For sellers
How to price an AI agent
A practical pricing guide for AI agents, prompts, and assistants — what buyers pay for and how to set a price that converts.
Foundations
Where to Learn About AI Agents in 2026
A curated, no-fluff path to learning AI agents in 2026: the concepts to read first, the best free and paid courses, the frameworks to build with, and the cost mistake almost everyone makes.
For sellers
How to earn from your AI expertise
If you can get AI to reliably do a job, that skill has value. The practical way to earn from it — package and sell the prompts, personas, skills, assistants, and agents buyers already want.
For buyers
How to choose an AI persona (a buyer's guide)
What makes a good AI persona, how to pick the right one for your job, and how to drop it into ChatGPT, Claude, or Gemini.
For buyers
How to buy an AI agent (what to check first)
A buyer's checklist for AI agents: the tested runbook, model, token cost, scope, reviews, and editability to check before you pay.
For buyers
Is there a marketplace for AI agents?
Yes — and here is how an AI agent marketplace works: what you can buy, how buying an agent works, and why it beats building one from scratch.
For sellers
How to sell AI agents and assistants
How to turn an AI agent or assistant into a premium listing — build something reliable, document the runbook, price for the job done, and publish it where buyers are looking.
For sellers
How to sell AI prompts (and get paid for them)
A step-by-step guide to turning a tested prompt into a listing that sells — what makes a prompt worth paying for, how to price it, and where to list it.
Foundations
How we count tokens
What a token is, how input and output costs add up, and where to read the estimate on any listing before you buy.
Foundations
The 5 AI building blocks of Sigrix
Prompts, skills, assistants, agents, and the products that bundle them — the vocabulary for everything Sigrix sells.
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