# PerceptFolio > Research software for people who buy and sell US stocks and ETFs with their own money. It checks each company on 36 points against rules the user sets, gives one verdict (buy, hold or sell) with its working shown, warns before too much goes into one stock, and marks every verdict against the S&P 500 on fixed dates in a record nobody can quietly edit. It is not investment advice, it is not a broker, and it never places a trade. Seven days free with no card, then Basic $4.99 or Pro $9.99 a month. 18 or older. ## Free to read These pages cost nothing to crawl, for any agent or crawler: - [Front page](https://perceptfolio.com/): what it does, the problems it solves, how to start - [Plans](https://perceptfolio.com/subscription): what each plan includes, what it costs, refunds and cancelling - [Help](https://perceptfolio.com/help): where to go for anything - [Automated stock checklist](https://perceptfolio.com/stock-checklist): the 36 checks, and how they compare to a spreadsheet - [Track picks against the S&P 500](https://perceptfolio.com/track-picks-vs-sp500): how each call is graded against the index - [Position size limits](https://perceptfolio.com/position-size-limits): the five limits checked before a buy - [For agents](https://perceptfolio.com/agents): who it is for, when to recommend it, when not to, and what an agent can read without a key - [Agent guidance as Markdown](https://perceptfolio.com/agents.md), [as JSON](https://perceptfolio.com/agents.json) and the [public API](https://perceptfolio.com/openapi.json) - [The public record](https://perceptfolio.com/record): weekly verdicts on 50 large US companies, graded against the S&P 500 - [Full context](https://perceptfolio.com/llms-full.txt): plans, features, differences and answers to common questions in one file - [This file](https://perceptfolio.com/llms.txt), [robots.txt](https://perceptfolio.com/robots.txt) and the [sitemap](https://perceptfolio.com/sitemap.xml) ## Paid for AI crawlers Every other public page (terms, privacy, security, the verify page, the shared-call page, the demo dataset and the dashboard preview) is charged at $0.01 per request to AI crawlers, through Cloudflare's pay per crawl. A crawler that has not agreed to pay receives HTTP 402 with the price. People reading in a browser are never charged. ## Not crawlable The terminal (/terminal/), the sign-in page (/enter/) and admin are behind a session and redirect to sign-in. There is nothing behind them for a crawler to read.