Verified verbatim eCFR plus a proprietary FMCSA-compliance strategy corpus, in one fast JSON API. It powers every X3 product — and now you can build on it: compliance software, brokers, TMS, insurers, AI agents.
This box calls the real API. Try brakes, hours of service, 393.9, hazmat placard.
Real, verified regulation text pulled from the official eCFR — the only thing you'd ever quote as law. Look it up by citation: /api/cfr?c=49 CFR 393.9. If a section isn't verified, the API says so instead of guessing.
A proprietary, X3-authored knowledge base of 65,000+ compliance plays — DataQ defenses, CSA BASIC strategy, hazmat, HOS, drug & alcohol, audit prep. Clearly labeled as guidance, never as law. This is the part you can't get anywhere else.
Why it's defensible: the regulation text is public, but the strategy corpus is ours — authored, structured, and maintained by X3. You're licensing knowledge that doesn't exist anywhere else, not reselling public government data.
The knowledge API is free to start — verbatim 49 CFR plus the proprietary strategy corpus. Need higher volume, bulk export, or live carrier safety data piped into your product? That's an enterprise conversation.
Generous fair-use
Higher limits
SLA + carrier data feed
Base URL https://x3dotskills.com. Auth via the x-api-key header or ?key=. Light use works with no key.
Verbatim eCFR section. Also accepts ?part=393§ion=9.
curl "https://x3dotskills.com/api/cfr?c=49%20CFR%20393.9" \ -H "x-api-key: x3k_your_key"
Full-text search across verbatim eCFR + the strategy corpus. type = all | cfr | skills.
curl "https://x3dotskills.com/api/search?q=hours+of+service&type=cfr"
A single strategy document (guidance, not law).
curl "https://x3dotskills.com/api/skill?slug=dataq-citation-format-0017" \ -H "x-api-key: x3k_your_key"
Your plan, quota, and usage this period.
Verbatim CFR is served from verified eCFR. Strategy-corpus content is informational and AI-assisted — not legal advice. © 2026 X3 Fleet Safety LLC.
