Castle
YC Winter 2016 ActiveBlock bots & bad behavior
https://castle.io ↗Thesis fit
Off-thesis
Outside your stated focus; easy to skip unless something exceptional.
Below your usual filter (40+)
Idea match
Moderate
How close the company’s idea is to your thesis statement
Sector
None
Overlap with sectors you care about
Geography
Unknown
Location unknown — scores 0
Your thesis: “We back exceptional technical founders building AI-first products and infrastructure, deploying $100K checks within 24 hours.”
Founder → stable
Traction → stable
Idea vs market ↑ improving
▸ Add / edit details
Correct facts used on the next screening or memo.
People
No founders linked yet.
YC company pages list founders in page JSON, but we only scrape a capped slice
of the directory. Pull this slug with
.venv/bin/python run_sourcing.py --sources yc_founders --slugs castle-2
then re-ingest.
Open on YC ↗
Activity & evidence
Similar baseline plays (YC · idea space)
Keyri
· Acquired
Secure fraud prevention and authentication platform for developers
Zain Azeem
Saif Malik
Smyte
· Acquired
Smyte stops bad actors on social networks and marketplaces.
Pete Hunt
Julian Tempelsman
Josh Yudaken
Bjoern Zinssmeister