Sumada Kaabaha: pay-per-article
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Creditable Paywall
Creditable Paywall integrates pay-per-article into your website. Easily monetize your website by allowing readers to pay with credits (micropayments)
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Creditable Leaky Paywall Addon
Add Creditable pay-per-article to Leaky Paywall, letting you earn by charging non-registered or non-subscribing readers with universal credits.
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Acta — Pay Per Article
A pay-per-post solution for WordPress publishers. Give casual visitors a simple way to pay for content, no subscription required.