Get XML and JSON results of relationships between websites that show what sites are linked together, by what and for how long.
The general access method is as follows -
You must provide your API key in each lookup. See the examples for how this works.
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Get Domain Example
XML Get Single Domain
JSON Get Single Domain
The following GET parameters can be supplied for lookups
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Domains and sub-domains work with the Relationship API (not internal pages)
When doing RAW domain lookups, you can parse up to 16 domains at once as a CSV. For example cnn.com,about.com,builtwith.com - this dramatically improves throughput.
The Relationship API will respond with a document in the format -
Results is the top level response that identifies the lookup.
||The domain that was looked up.
||Identifier explained below
Identifiers are the unique codes that are found on the domain and other domains that also have it.
||The type of identifier See all Types
||The value of the identifier - typically the code of the identifier like an IP address or an account id.
||The date we first detected this identifier
||The date we last detected this identifier
||Match explained below
Matches are other domains that have this identifier.
||The domain name of the match
||The date we first detected this on the matched domain
||The date we last detected this on the matched domain
||If this domain used the identifier at the same time as the lookup Domain
JSON/XML have integrations in all modern programming languages. Here's some StackOverflow topics for various languages - Python, C#, Java, PHP, C++, TSQL and Ruby.
Note error messages in this format cannot be guaranteed, your implementation should also consider non-200 response codes as errors. The Lookup property will be null (json) or not provided (xml) if the error is server related. View all potential well-formed error codes.
Our standard terms cover the use all of our APIs.
In general, you can use the API to enhance your product in many ways. The only limitation is you cannot resell the data as-is or provide duplicate functionality to builtwith.com and its associated services.