# Campaign Monitor SOAP API (legacy createsend)

**Canonical:** https://apis.io/apis/campaignmonitor/createsend-soap-api/  
**Provider:** Campaign Monitor — https://apis.io/providers/campaignmonitor/  
**Base URL:** https://api.createsend.com/api/api.asmx  
**Documentation:** https://api.createsend.com/api/api.asmx

Campaign Monitor SOAP API (legacy createsend) is one of 3 APIs that [Campaign Monitor](https://apis.io/providers/campaignmonitor/) publishes on the [APIs.io](https://apis.io/) network. Tagged areas include Email Marketing, Subscribers, and SOAP.

Legacy ASP.NET SOAP web service still served at api.createsend.com/api/api.asmx, the same host as the REST v3.3 API. Its WSDL (targetNamespace http://api.createsend.com/api/) declares 50 SOAP operations (plus HTTP GET/POST bindings) for subscribers, lists, clients and campaigns, such as AddSubscriberWithCustomFields, Unsubscribe and GetSubscribers. The current developer docs describe only the REST API; the WSDL is saved verbatim as served.

## Machine-readable artifacts (2)

- **WSDL** — https://raw.githubusercontent.com/api-evangelist/campaignmonitor/refs/heads/main/wsdl/campaignmonitor-createsend-api.wsdl
- **WSDL** — https://api.createsend.com/api/api.asmx?wsdl

## Other Campaign Monitor APIs (2)

- [Campaign Monitor API](https://apis.io/apis/campaignmonitor/campaign-monitor-api/)
- [Campaign Monitor API](https://apis.io/apis/campaignmonitor/campaignmonitor-api/)

## Tags

Email Marketing, Subscribers, SOAP

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Profiled by [API Evangelist](https://apievangelist.com) and published on [APIs.io](https://apis.io/apis/campaignmonitor/createsend-soap-api/). The API's provider profile, Kin Score and agent-readiness rating are at https://apis.io/providers/campaignmonitor/.