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Handlescout - Get notified when a Twitter username becomes available

Cash App - The easy way to send, spend, bank, and invest.

Namechk - See if your username is available on 100+ social networks

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.

Stacky.me - Easily manage all your bio links in one place.