We build our GUI on top of a GraphQL API. If you want to integrate 21 Travel Rule with your own IT infrastructure, you can use the same GraphQL API.
The API is self-documenting. The documentation linked is running on a server of ours with fake data and is periodically reset. No guarantees are made about uptime and stability. It can be used for exploring and testing only. You need to run our software on your IT infrastructure. Find the 'Docs' link in the upper left corner to view additional documentation.