Foundations,
tutorials & patterns.
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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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.
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.
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.
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.
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.
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.
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.
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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Patterns, sample listings, and short essays from the Sigrix editorial team. One-click unsubscribe, no noise.