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textCAPTCHA API

The service implements captcha to prevent bots and automated scripts from submitting forms and using other website resources, typically for the purpose of posting spam messages. Unlike services using distorted images, textCAPTCHA posts random, text-based questions, such as easy arithmetic problems or logic puzzles, which users must correctly solve to proceed. Bots unable to interpret the meaning of the text are prevented from continuing.

API methods support requests for questions and MD5 hashes of any permitted answers.

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textCAPTCHA: Highlights

Summary
Text-based captcha service
Category
Security
Tags
Protocols
REST
Data Formats
XML
API home
http://textcaptcha.com/how_it_works 

textCAPTCHA: Specifications

Functionality

Client Install Required
No  
Service Endpoint
http://api.textcaptcha.com/

Signup and Licensing

Signup Requirements
Yes, obtain API key  
Developer Key Required
Yes  
Account Required
No  
Commercial Licensing
Yes  
Provider
blog.rob.cx/  
Non-Commercial Lic.
Yes  
Data Licensing
 
Usage Fees
Free  
Program Fees
 
Certification Program
 
Usage Limits
 
Terms of Service
 

Security

Authentication Model
API Key 
SSL Support
No 
Read-only Without Login
No 

Support

Vendor API Kits
 
Community API Kits
 
API Blog
 
Site Blog
 
API Forum
 
Developer Support
 
Console URL
 

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Mashups, Developers & Source Code

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Executive Editor, ProgrammableWeb. Author, Map Scripting 101. Lover, APIs.