When making API requests, you must send an lmnt-version request header. For example, lmnt-version: 2025-09-25. If you're using one of our Client SDKs, this is handled for you automatically.
For any given version, we will preserve:
- Existing input parameters
- Existing output fields
However, we may do the following:
- Add additional optional inputs
- Add additional fields to outputs
- Change conditions for specific error types
- Add new variants to enum-like output values (for example, new streaming event types or new
formatvalues)
Generally, if you are using the API as documented in this reference, we will not break your usage.
Version history
We always recommend using the latest API version whenever possible. Previous versions are considered deprecated and may be unavailable to new users.
2025-09-25: Initial version.