The stampd Blockchain Time Stamping API creates notarized documents with a cryptographic hash. It is available with JSON objects and GET methods. Authentication is accessible with client_id and secret_key. Users can obtain a stamped document by investing EUR 0.09 (9 cents) via PayPal. To stamp a document, visit https://stampd.io/
This article is part of a series about interesting APIs that were added to our directory during 2017. Finance, Payments, Blockchain and Banking APIs are covered in this segment. The APIs were chosen by our researchers, by popularity according to website traffic, and by mentions on social media.
Fifteen APIs have been added to the ProgrammableWeb directory in categories including Internet of Things, Engagement, Chat, and Jobs. Highlights today include an API that can enable apps to monitor air quality and an API that can enable apps to count people. Here's a look at what is new.