> For the complete documentation index, see [llms.txt](https://docs.ensemble.io/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.ensemble.io/data-and-transparency/data-and-transparency.md).

# Data and transparency

Read vault performance with its source, timing, and limitations.

A useful number tells you what it measures, where it came from, and how old it is. These guides explain how to read vault values and performance without confusing earlier observations with current transaction availability.

* [Sources of truth](/data-and-transparency/sources-of-truth.md) explains which record answers each question.
* [Performance methodology](/data-and-transparency/performance-methodology.md) explains how returns and costs are measured.
* [Status and data quality](/data-and-transparency/status-and-data-quality.md) explains stale, partial, and unavailable data.

Unknown, stale, or partial data should remain labeled as such. It must not be silently converted to zero or a complete performance claim.