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Venali is a provider of enterprise Internet fax messaging. The Venali Fax Web Service API provides integration between the Venali Global IP Fax Network and applications such as enterprise software applications, ERP, CRM and HR systems, to corporate portals and desktop applications. The API uses SOAP protocol and responses are formatted in XML. Full documentation is not publicly available.

Use the RingCentral FaxOut API to pass fax data to RingCentral so that your fax can be sent. The response tells you whether the fax was accepted or not. In the request, you can include a recipient's phone number, coverpage, resolution, send time, and attachment containing the document to fax. The FaxOut API is related to the RingCentral Fax product, which has features of toll free or local numbers, receiving faxes as emails, faxing from an application, electronic editing and signatures, secure faxes, and fax alerts and history logs.

The Popfax Machine-to-Machine API supports SM, voice mail, fax sending and receiving functions for registered end users, moreover it offers a super user set of functions enabling third party integrators to administrate a group of end users accounts. The Popfax API uses SOAP protocol and responses are formatted in XML. For documentation, see links on right side of page.

Phaxio lets developers build faxing capabilities into systems with a simple API. The API exposes functionality such as sending and receiving faxes, get fax and account status and list faxes in a date range. The API uses RESTful calls and responses are formatted in JSON. The site is currently in Beta, and v2 of the API is coming soon.

PamFax is an internet faxing service. PamFax is available for Windows, Macintosh, Linux and Android with built in support for Dropbox, Box.net and Google Documents. The API provides full control of PamFax features. It uses HTTPS protocol and returns responses formatted in XML.

OneOutBox offers Web Service integration with outbound FAX for the transmission of invoices, correspondence, order confirmation, status reporting, workflow updates, and more. The API uses SOAP protocol and responses are formatted in XML.

Mutltiple methods give developers control of outbound fax transmission, inbound fax reception, and administrative control (add users, set preferences, etc.). Secure access is accessible via SSL.

FAXAGE offers API-based fax sending and receiving, automated number provisioning, and call-detail record collection. The FAXAGE Internet Fax API allows for the FAXAGE service to be used as a fax back end, integrated into user systems or software. The API can be used to fax-enable ERP and other back-office systems that need the capability to fax. It can also be used to create a white label fax service. It also provides call detail record gathering for accounting or downstream billing and allows for automated fax number provisioning. The API uses RESTful calls and responses are formatted in XML.

Fax Desk is a service to send and receive faxes online. Features include 24-hour fax numbers, faxes delivered as emails, and international faxing. The Fax Desk API is a post-only API that allows users to access Fax Desk functionality. The API methods are sending a fax and receiving a fax.

From their site: The Zvents Developer API provides programmatic access to objects stored in Zvents. These objects include events, venues, groups, users and tags. The API currently supports a REST interface meaning that all interaction with the API is performed over the HTTP protocol. All API calls support a number of output formats including XML, RSS and JSON.