| API | Description | Category | Date |
|---|---|---|---|
| Click.st | Social Media Marketing platform | Social | 2011-07-14 |
| ClickAider | PPC ad tracking service | Advertising | 2009-12-04 |
| ClientRocket | Business loyalty solutions | Enterprise | 2012-05-29 |
| CoffeeBean | Social media sales prospecting and relationship management service | Enterprise | 2012-01-05 |
| Commission Factory | Affiliate network services | Advertising | 2013-04-18 |
| Compendium | Content marketing service | Media Management | 2012-08-17 |
| ConstantContact | Email marketing service | 2009-02-14 | |
| Contactology | Best Email Marketing API | 2008-12-07 | |
| Contactually | Customer relationship management (CRM) service | Enterprise | 2013-04-03 |
| Converser | Customer engagement service | Enterprise | 2013-06-11 |
| Curebit | Customer sales referral service | Retail | 2011-09-22 |
| Customer.io | Email campaign optimization service | 2013-06-12 | |
| Dialect Premailer | HTML email preparation service | 2012-03-16 | |
| Direct Mail Manager | Direct mail marketing service | 2012-07-03 | |
| E-goi | Multichannel marketing service | Advertising | 2013-01-21 |
| Email Data Source | Email marketing campaign management | 2009-05-10 | |
| EmailBrain | Email marketing campaign management service | 2012-06-20 | |
| EmailDirect | Email marketing campaign management service | 2012-02-23 | |
| Emailloop | Email marketing service | 2011-09-13 | |
| EmailOnAcid | Email Testing Service | 2013-03-20 |
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