API registry / Splitwise
Splitwise
Splitwise's spec (github.com/splitwise/api-docs, splitwise.yaml) is split across relative $ref files (paths/, schemas/, responses/), so it isn't a self-contained file the registry can read. API reference: https://dev.splitwise.com
Apideck doesn't connect Splitwise yet, so its tools aren't available to your agent here. It's listed for its spec.
Splitwise publishes no machine-readable API spec.