Been here. I'm currently going on 2 months without a phone, since Google is still processing my warranty replacement (they promised 3-5 business days at the outset).
As a friend of mine says "it's a monopoly issue. Usually if you're not well served you stop buying a service, not the case with Google." https://twitter.com/govind201/status/804559006551244800
Noted. I'm curious about the motivating factor though - would you like the graphs to validate the depth of the data, get you excited with potential possibilities? Or something else?
We don't have books yet. That's been a common request, so we'll be launching with books by the end of the month. If you'd like, I can notify you as soon as we do.
Please check out the Book Prices API from DataWeave here: http://www.dataweave.in/apis/dataset-Book-Price-Search-By-IS... (Full Disclosure: I am an employee of DataWeave). Currently, we are serving data from Indian eCommerce stores, but expansion to other geographies is in the pipeline. You can search by ISBN as well as many other fields.
1. Right now, we're focusing on the US. But we've made room for expanding internationally (the "currency" and "geo" fields are in place with this in mind).
2. We're analyzing used and refurbished products as well. Each offer is tagged with a "condition" field that conveys this.
3. The question of whether a price of a product is right or wrong is, we realized with time, subjective. Yes, $1,000,000,000,000.00 is very unlikely, but where does one drawn the line? Hence, we don't mark something as bad data and remove it from the database at the data layer. But we do handle this problem at the search layer - we internally rank products based on factors such as their (estimated) genuineness, popularity and so on. For the user, what this means is that when you query the API, only the most relevant products will be returned. The ranking system is constantly learning, so the vision is that it'll get better with time and data.
Thanks for your words about the pricing. Each API query returns upto 10 products; the free plan provides 1000 API queries a day. So you could retrieve upto 10000 products each day. Hope that clarifies. Glad you find the API useful - I'd love to know more about how you plan to use it!
The guideline behind the free plan was to provide enough calls and functionality for any developer to build, launch and maintain a moderately sized app. Shout-out aghi from Mashape for helping us with the pricing.