- Twilio: Communication - SMS, Whatsapp, Voice, etc
- MailChimp: Marketing/Email
- SignalWire: Advanced Communication (SMS)
- Pusher: Realtime communication, Push Notifications, and Chat
- SendGrid: Email communications
- Slack: Workplace communication
- Plaid: Banking & Financial Data
- Teller: Banking
- Stripe: Payments & Billing
- Square: Payments, Billing
- Quid: Payments (7% flat rate, good for micro transactions)
- Paddle: Subscriptions & Payments
- Root: Banking & Insurance
- Alpaca: Commission-free Stock Trading
- TangoCard: Rewards & Fulfillment
- Printful: Custom Products - TShirts, etc
- Blackbox: Shipping/Fulfillment (doesn't appear to be an API)
- Lightrail: Your own gift cards
- Auth0: Authentication, User Management
- SportsData: Sports Betting
- Skyscanner: Travel and Trip Planning
- Otreeba: Cannabis
- Ticketmaster: Events/Tickets
- Lemonade: Insurance Products
- Postmates: Delivery Dispatch
- Email Verifier: Validates Email accounts are legitimate