Daily API RoundUp: Reverb, LeadSift, Netra, Handwriting.io, DocuSign

Every day, the ProgrammableWeb team is busy, updating its three primary directories for APIs, clients (language-specific libraries or SDKs for consuming or providing APIs), and source code samples. If you have new APIs, clients, or Source Code examples to add to ProgrammableWeb’s directories, we offer forms (APIs, Clients, Source Code) for submitting them to our API research team. If there’s a listing in one of our directories that you’d like to claim as the owner, please contact us at editor@programmableweb.com.

We’ve added 6 APIs to the ProgrammableWeb directory today in Writing, Customer Service, and Marketplace categories, among others. Also added were several SDKs and libraries for use with the DocuSign API.


Handwriting.io from Gracious Eloise is a Platform that transforms text into handwriting to be used for emails, invitations, notes, and other content. The Handwriting.io REST API allows developers to get lists of handwritings, render text into handwriting, and retrieve the renders.

Handwriting.io demonstration
image: Handwriting.io demonstration

We’ve primarily categorized the Handwriting.io API under the Writing category. See ProgrammableWeb’s complete list of Writing APIs.

Talkdesk is a platform for call centers that provide customer service over the phone. The Talkdesk REST API allows developers to integrate with the service, access data, manage calls, manage call workflows, and manage user accounts. We’ve primarily categorized the Talkdesk API under the Customer Service category. See ProgrammableWeb’s complete list of Customer Service APIs.

Reverb is an online marketplace where users can buy and sell used, vintage, and rare music equipment and instruments.

Reverb music marketplace
New, used, and vintage musical instruments are for sale on Reverb.com. Access the marketplace via their REST API.

With the Reverb REST API, developers can access and integrate the functionality of Reverb with other applications. This API is listed under the Marketplace category. See ProgrammableWeb’s complete list of Marketplace APIs.

LeadSift is a social intelligence platform that mines audiences to help brands reach consumers. Over 100 attributes about user habits, trends, preferences, and lifestyle are extracted and analyzed to create a view of a customer. The Consumer Insights API allows for easy Integration of real-time social insights into other business applications to enrich contact and profile data. We’ve listed the Consumer Insights API under the Social category. See ProgrammableWeb’s complete list of Social APIs.

Netra is a visual search platform that allows users to search images and videos for specific objects and keywords. The Netra REST API allows developers to access and integrate the functionality of Netra with other apps. Public Documentation is not available.

Netra API for search and organizing images
Search for objects of interest, manage, edit, and organize images with Netra.

We’ve primarily categorized the Netra API under the Images category. See ProgrammableWeb’s complete list of Images APIs.

Knotable is an application that allows teams to work together and collaborate without email and meetings. The Knotable REST API allows developers to access and integrate the functionality of Knotable with other applications. The main API method is creating a Knotable notepad. The Knotable API is listed in Collaboration APIs. See ProgrammableWeb’s complete list of Collaboration APIs.


DocuSign is a legally compliant online eSignature service with an API provided to developers for application integration. Several libraries for use with the DocuSign API have been added to the directory that were provided by DocuSign. They are:

DocuSign .NET Client Library is an official integration tool for the DocuSign API and apps and websites using the .NET programming language.

DocuSign PHP Client Library provides a Library to interact with the DocuSign API using JSON parsing through PHP's native json_encode() and json_decode() functions. This Client provides samples for frequent use scenarios.

DocuSign SOAP SDK Library provides an SDK library in JAVA, .NET, PHP, Ruby, and Salesforce to integrate DocuSign Web Services API into applications.

DocuSign Java Client Library provides a Java client library for use with the DocuSign REST API.

Several other libraries by independent developers were also added to the directory. They include:

DocuSign Ruby Library by Donald Piret offers a Savon-based library to allow communicating with the DocuSign API.

DocuSign Ruby Library by Texel allows communicating with the Docusign API via SOAP.

DocuSign REST API Ruby Wrapper by Jon Kinney provides a Ruby Gem that connects a Ruby Rails app to DocuSign API for signature services.

DocuSign Java Restful Client Library by techblue: This RESTful Client for DocuSign provides a Java REST Client for consuming RESTful services.

DocuSign iOS Objective-C SDK by Deyton allows developers to access DocuSign API through iOS apps, using the Objective-C programming language.

DocuSign REST API Docusigner Ruby Gem by Jeff Ching provides access to the DocuSign API through a Ruby Gem.

DocuSign SDK Ruby Gem by Nicholas Reed provides a Ruby wrapper for the DocuSign API.

DocuSign API Ruby Library by Leigh Caplan provides SOAP4R-generated proxy classes and extends additional useful classes through Ruby wrappers to interact with DocuSign API and associated objects.

Be sure to read the next Images article: Daily API RoundUp: Deepomatic, ImgServe, Receptiviti, U.S. Department of Labor