| API | Description | Category | Date |
|---|---|---|---|
| ChemSpider | Chemical structure database | Science | 2011-12-05 |
| China Historical GIS | Chinese history and geography information service | Reference | 2012-01-17 |
| Chinese PostalCodeSearch | Chinese postal code lookup service | Reference | 2012-03-02 |
| Chronicling America | Archive of US newspapers | News | 2009-10-22 |
| CitedIn | PubMed citation tracking service | Search | 2011-11-08 |
| CiteULike | Citation management service | Reference | 2011-11-08 |
| City and State by Zip Code | Address lookup service | Reference | 2006-11-19 |
| CityGroups | Local public directory | Reference | 2011-09-13 |
| ClinicalTrials.gov | Clinical trials database and registry | Medical | 2011-07-26 |
| Clodoc | Clojure programming documentation service | Reference | 2012-04-24 |
| ClojureDocs | Clojure programming language example repository | Reference | 2012-11-28 |
| Collins Dictionary | Online dictionary | Dictionary | 2013-05-02 |
| CommonDataHub | Universal data standards repository | Reference | 2012-08-15 |
| Complexity Intelligence Spell Checker | Spelling correction and recommendation service | Reference | 2010-11-11 |
| Comprehensive Knowledge Archive Network | Community driven open knowledge database | Reference | 2008-07-10 |
| Conversions | Online calculator and measurment converter | Reference | 2010-01-14 |
| Copac SALT recommender | Library resource recommendation service | Reference | 2012-10-31 |
| CoPub | Medical research text mining service | Science | 2012-09-28 |
| Cortera | Business information and research data | Reference | 2008-05-01 |
| Cortera Business Vitals | Basic company information web service | Reference | 2008-05-11 |
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