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The Groundwork - The API for building modern movements
Swapstack - Swapstack, now acquired by beehiiv! Check out what we're doing over at beehiiv's incredible ad network: https://www.beehiiv.com/features/ad-network/brands and come thrive with the hiiv!
PayRequest - SImple Fast Payment Links
PEAR - Connecting newsletters and advertisers 🍐
LetterWell - Buy and sell ad space in email newsletters
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.