ZELF - Instant money in messengers
MonetizeJS - Modern payment platform, no server required.
Unlock - Monetize your content with a few lines of code
CoinPatron - Monetize your content for bitcoin
Stripe - Online payment processing for internet businesses. Stripe is a suite of payment APIs that powers commerce for online businesses of all sizes. Use Stripe’s payment platform to accept and process payments online for easy-to-use commerce solutions.
Kale - Kale helps nanoinfluencers (<10k followers) make a passive income.