Braintree - An all-in-one solution to accept, process, and split payments in your mobile app or online - from small business to large enterprise.

Camelcamelcamel - Easily monitor Amazon product prices and get alerts when they drop.

ProPay - ProPay is a multiple payment making service provider that lets its users to make payment to anyone in any part of the world.

Price Tracker by Relbis Labs - Price Tracker is a command-line tool for monitoring the prices of productsFeaturesTracking prices and availability of products.Tracking Amazon Kindle books.Displaying products information in a terminal.Exporting data into Excel and YAML files.

XE.com - XE.com Inc. (XE) is a Canadian online foreign exchange services company.

Pricy - Amazon price watch