> For the complete documentation index, see [llms.txt](https://developer.salesintel.io/salesintel-api-documentation/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://developer.salesintel.io/salesintel-api-documentation/getting-started-with-salesintel-apis/use-cases/a-note-on-data-quality-tiers.md).

# A Note on Data Quality Tiers

SalesIntel exposes two tiers of data via our APIs - human-verified and machine-verified. Human-verified data has each data point assessed by our researches. Machine-verified data is based on layering signals and data science. Both tiers of data are valuable for different purposes. Please connect with the SalesIntel team about your use case and we can advise when to use what data.

All of the APIs allow for filtering of quality tiers based on the `verified` parameter, which can be helpful based on what you are trying to accomplish and can help eliminate overlap or duplication between records. Your contract may support different rates between different tiers of data, as well.