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There are 2 key steps in performing an appraisal using the ValueChecker API. To get started, you will need an API key as described in the Authentication section. Here are the 2 steps needed to calculate an appraisal:
1

CP (Claimed Product)

Search by a query string and an optional category to identify the Claimed Product (CP). Example:
/query=iphone 11 64&client_category=Mobile%20Phones
Try it here: /product_search
response excerpt
2

RP (Replacement Product)

Search using a pid to return Replacement Product (RP) suggestions and prices.
/prices?pid=1032089319&country=nl
For locale pricing purposes, country is also a required variable.
Try it here: /prices
response excerpt