source
cc | deltaFilters by crawl provenance: the batch corpus, or the delta crawler.
Every passage records how it entered the index. cc means it was selected and extracted from a batch snapshot; delta means the delta crawler fetched it for freshness, gap-fill, or in response to a query miss.
Filtering to delta is the fastest way to see what the index has learned recently. Filtering to cc gives you the stable, broad backbone.
Accepted values
- cc
- delta
The live vocabulary is served by /describe — read it rather than hardcoding this list.
Example
curl -H "x-api-key: $UNLOB_API_KEY" \
"https://api.unlob.com/search?q=ai+regulation&source=delta"Common questions
What does the source filter do?
Filters by crawl provenance: the batch corpus, or the delta crawler.
When should I use source?
You need to reason about how fresh or how broad your evidence base is.
How does source behave in practice?
Filtering to `delta` is the fastest way to see what the index has learned recently. Filtering to `cc` gives you the stable, broad backbone.
Filters are free
Every filter is evaluated against a stored field, so it narrows the candidate set before scoring — a filtered query is often faster than an unfiltered one.