| API | Description | Category | Mashups |
|---|---|---|---|
| PayPal | Online payments | Payment | 35 |
| FreshBooks | Online invoicing and time tracking | Financial | 5 |
| Stripe | Online payment service | Payment | 5 |
| Blinksale | Online invoicing services | Financial | 3 |
| billomat | Online billing service | Financial | 2 |
| Tradeshift | Business Network and Invoice management service | Enterprise | 1 |
| 1DayLater | Business expense tracking tool | Enterprise | 0 |
| 360 Business Tool | Business management service | Enterprise | 0 |
| ActiveCollab | Collaboration & Project Management System | Tools | 0 |
| billFLO Seller | Invoice management service | Financial | 0 |
| BillingOrchard | Online billing system | Payment | 0 |
| Billy's Billing | Bookkeeping software for entrepreneurs | Office | 0 |
| BitPay Payment Gateway | Bitcoin Payment Service | Payment | 0 |
| Blesta | Billing Service | Financial | 0 |
| Bunker App | Project management platform | Project Management | 0 |
| Cashboard | Financial and time tracking service | Enterprise | 0 |
| CashFlows | Web and mobile payment platform | Payment | 0 |
| ClientBill | Online invoicing service | Office | 0 |
| CurdBee | Online billing software | Financial | 0 |
| e-conomic | Online accounting software | Financial | 0 |





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