Terms of Service

Plain-language rules for using Proseify. By creating an account or buying a plan you agree to them.

Last updated: 17 September 2026

The short version. Pay for a plan, get an API key, use it with your AI tools to write books. Don't abuse it, don't share keys, don't use it to break laws — and don't blame us if an AI-written book isn't a masterpiece. Cancel any time from your account page.

1. Who we are

"Proseify" (referred to as "we", "us" or "our") operates the book-writing service at proseify.xyz — an MCP (Model Context Protocol) server that exposes a curated corpus of public-domain literature and a guided book-writing pipeline to AI clients such as Claude Code, Cursor or Codex. Questions about these terms: support@proseify.xyz.

2. Your account

One person, one account. You sign in with Google, GitHub, or a one-time email link; the email attached to that identity identifies your account.
You're responsible for keeping your signing-in method secure. Whoever controls your Google/GitHub account controls your Proseify account.
Your API key is secret. It grants billed access to the service. Don't publish it, paste it into shared code, screenshots, or support tickets. Treat a leaked key like a leaked password — tell us and we'll rotate it.
We may suspend or terminate accounts that abuse the service (see §5), fail to pay after proper notice, or put the service or other customers at risk.

3. Subscriptions, billing and cancellation

Recurring plans (MCP, Pro) renew automatically at the interval you picked — monthly — until cancelled. Prices are shown before checkout and exclude any tax Polar adds for your jurisdiction.
Cancelling: you can cancel any time from your account page under Manage subscription (opens our payment provider, Polar). Cancellation stops future renewals; your access continues to the end of the period you already paid for. If you'd rather not self-serve, email support@proseify.xyz and we'll do it for you within one business day.
Refunds: first 14 days of a brand-new recurring subscription are refundable on request. Beyond that we refund only where the law requires; we do not offer "changed my mind" refunds on used subscriptions. Polar is our merchant of record and their receipt is your proof of payment.
Price changes: if we ever change pricing for existing subscribers, we'll give at least 30 days' notice by email before the new price applies, and you can cancel before then without charge.

4. What you get — and what you don't

Your plan buys API access: the number of requests per minute your plan allows, to the tools described on the site (corpus search, chapter analysis, outline and drafting tools). The writing itself runs on your own model key, so no plan includes hosted book generation — you bring your own model key.
Fair use. The rate limit per key is the boundary. Tail of it: don't run twenty clients round-the-clock on one Pro-plan key, don't resell access, don't build a competing product on top of our API, don't try to bypass rate limits.
One key per customer is issued automatically. Keys propagate to the server on a short cycle — allow up to a minute after purchase before your first call.
You keep everything you write. Proseify is a tool. The prose your AI produces with our guidance is yours — you own it, including commercially, subject to whatever your own AI provider's terms say about model output. Nothing you write is stored by us.

5. The library and line-boundary materials

Search results, style statistics, chapter text and prompts are drawn from public-domain literature (largely Project Gutenberg and similar sources), plus our own short analytical extras.
Public-domain material belongs to everyone; you may use output built on it freely. We make no claim of ownership over the source texts.

6. Acceptable use

Don't use Proseify to produce content that is illegal where you live, incites violence, targets people with harassment, sexual content involving minors, malware, or deliberate disinformation.
Don't probe, scrape or attack our endpoints, try to break authentication, or hammer the service to make it slow for everyone else.
Don't upload unlawfully obtained text (e.g. current copyrighted novels) and ask us to style-match it. The corpus is public domain; stick to it.
We may throttle, suspend or terminate access that breaks these rules. If the underlying cause can be fixed, we'll try to tell you before we suspend.

7. Intellectual property

Your writing is yours. We claim no ownership of the books or passages you produce.
Our stuff stays ours. The Proseify name, pilcrow logo, site design, the API and the service itself are ours. Don't copy them into a competing product.
Book texts come from public-domain sources; metadata and statistics we produce are provided to you for use with the service.

8. Availability, changes and mistakes

We aim for the service to be available and useful but we don't promise it will never break. Planned maintenance, upstream outages (Cloudflare, our VPS, your AI provider) and internet-scale events can interrupt it. If something breaks for more than a day, we'll have posted about it on the site or emailed you.
We may change, add or retire features. If we retire something significant that you're actively using, we'll give reasonable notice first.
Corpus may grow or be reorganised. If a specific text matters to your workflow, don't assume it'll stay forever — but we won't remove anything without a reason.

9. Disclaimers — read this one

The service is provided "AS IS" and "AS AVAILABLE". We don't promise it'll be uninterrupted, bug-free or fit any particular purpose. We don't guarantee that AI-written output will be good, accurate, original, non-offensive or publishable, or that it'll clear someone else's plagiarism or copyright review — that's your job, like any editing pass. AI output can look confident and still be wrong.

10. Limitation of liability

To the maximum extent permitted by law, our total liability to you for any claim — however it arises — is limited to the greater of (a) the amount you paid us in the 12 months before the claim, or (b) €50. We're not liable for indirect or consequential losses (lost profits, lost manuscripts, lost goodwill, data you deleted, your AI provider's outages, or missed publishing deadlines). Nothing in these terms limits liability for fraud, gross negligence, or anything else that the law doesn't allow you to disclaim.

11. Indemnity

If you use Proseify in a way that breaks these terms or the law, and someone sues us because of it, you'll cover our reasonable costs and losses arising from that use.

12. Changes to these terms

We may update these terms. If a change is material, we'll email the account holder at least 14 days before it takes effect, and continuing to use the service after that counts as accepting the new terms. Historic versions are available on request.

13. Governing law

These terms are governed by the laws of the Republic of Albania (the operator's place of business), without regard to conflict-of-law rules. Nothing here removes consumer protections you have under the mandatory law of your own country. If you're a consumer in the EU, you may also use your local consumer-protection channels.

14. Contact

Questions, disputes, or a key you need rotated: support@proseify.xyz. We aim to reply within one business day.

Related: Privacy Policy · Refund Policy