If you have written an ebook (or plan to) and want to sell it, these are the top platforms:
Amazon KDP (Kindle Direct Publishing): The absolute biggest market. You upload your book, and it appears on Amazon worldwide.
Royalties: Up to 70% per sale.
Cost: Free to sign up.
Gumroad: Best if you want to sell directly to people on social media (Instagram, Twitter/X). It gives you a simple link to a checkout page.
Royalties: You keep ~90% (minus transaction fees).
Feature: Very easy to set up; no approval process needed.
Payhip: Similar to Gumroad but often has lower fees for beginners. It also handles EU VAT taxes automatically.
Cost: Free plan available (5% transaction fee).
Google Play Books: Great for reaching Android users. It is less competitive than Amazon, so it can be easier to get noticed.
2. To Buy Content to Resell (PLR Ebooks)
If you don't want to write a book but want to sell one, you need Private Label Rights (PLR). These sites let you buy a book once and resell it as your own.
PLR.me: High-quality, non-spammy content. They use a "credit" system. It is excellent for self-help and finance topics.
Content Sparks: Best for business and coaching content. It is more expensive but very professional.
Big Product Store: A membership site where you pay a monthly fee to download unlimited ebooks to resell.
IDPLR: A massive database of older, cheaper PLR products. Good for quantity, but quality varies.
3. To Earn by Referring Others (Affiliate)
If you want to earn money by sharing links to other people's ebooks:
ClickBank: The most famous marketplace for selling other people's ebooks. You can earn 50% to 75% commission on every sale. Look for "E-business" or "Health" categories.
Amazon Associates: You earn a small commission (approx. 4%) if someone buys a Kindle book through your link. Low pay, but people trust Amazon.
eBooks.com Affiliate: They pay decent commissions (8%–15%) for referring customers to their massive store of mainstream books.
4. To Download Free Ebooks (For Reading)
If you just want to read for free:
Project Gutenberg: Best for classics (Sherlock Holmes, Pride and Prejudice). Completely legal and free.
Open Library: A massive digital library where you can "borrow" modern books for free.
PDF Drive: A popular search engine for PDF files (use with caution, as copyright status varies).
Recommendation
If your goal is the $0.30 sign-up or income style you mentioned earlier:
Go to ClickBank, find a high-gravity ebook on "Make Money Online" or "Weight Loss," and promote that link. You will earn $20–$30 per sale, which is much faster than chasing small sign-up fees.