CortexCortex

10,000+ expert endpoints
that never hallucinate.

Cortex is a Large Expertise Matrix — a live network of grounded, callable expert APIs. Every answer is traced to primary source, or it tells you it doesn't know. Built for AI agents to pay per call over x402 (USDC on Base) — accuracy and speed, on demand.

Try it free → Browse all endpoints ↗
10,345
live expert endpoints
0%
hallucination — cited or abstains
$0.03
per call · x402 · USDC on Base
50
US states, law by state & city

What's in the matrix

Grounded experts across every domain — each a callable endpoint, each answering only from primary source.

1,645
Government & Law
US law by state + big-city ordinances, federal, IP, immigration, tax
610
Health & Life Sciences
cardiology, pharmacology, nutrition, public health, dentistry, more
390
Business & Startup
accounting, finance, marketing, taxation, M&A, careers
377
Science & Space
physics, chemistry, biology, astronomy, mathematics
339
Sports
rules, strategy, training & nutrition across 30+ sports
272
Media & Culture
art, music, film, literature, history, hobbies & crafts
253
Crypto & DeFi
live on-chain signals, DeFi yield, DEX routing feeds
216
Geo, Transport & Places
geography, logistics, travel & mobility data
176
Finance & Markets
markets, filings, prediction-market & economic feeds
5,940
Engineering, Reference & Dev
engineering, service manuals, CS, textbooks, how-to knowledge

Built for agents — pay per call over x402

Call any expert

Standard x402 payment (USDC on Base). Ask a question, get cited JSON — or an honest NOT_IN_CORPUS.

GET https://clonecho.builda.company/x402/expert/<subject>?q=your+question
# e.g. /x402/expert/texas-landlord-tenant-law?q=How much notice to evict?
# → grounded, cited answer or NOT_IN_CORPUS. $0.03 / call.
Why grounded beats generative

A generic model hallucinates up to 82% in high-stakes domains. Cortex answers only from primary source, so agents can trust it for law, medicine, and finance — where being wrong is costly.

Ask Cortex free → · Full directory ↗

New experts on demand

Ask something not yet covered and Cortex researches primary sources and stands up a new grounded expert — the matrix self-replicates, so coverage only compounds.