The compliance API that powers X3 — now open to your product.
Every X3 Fleet Safety product runs on one engine: verbatim 49 CFR, a 67,000-document compliance knowledge base, 200+ grounded compliance agents, and live carrier safety data by USDOT. Now you can build on the same engine — no regulation team required.
Four capabilities. One key.
The regulation, verbatim — and cited.
Query the exact controlling text of 49 CFR (and growing state coverage). Every response ties back to the section it came from, refreshed as the eCFR changes. No hallucinated rules, no stale citations.
200+ compliance agents, on tap.
Call the same specialist agents that power X3 HazMat, CSA, HOS, DataQ, Drug & Alcohol and more — each grounded in the verified corpus and scoped to a real compliance job. Ask a question, get a cited, decision-support answer.
Pull a carrier's safety picture by USDOT.
One call returns a carrier's authority, safety-rating factors, and inspection signals — perfect for TMS, insurers, brokers, and factoring platforms that need to vet carriers or embed compliance intelligence without building it themselves.
Every X3 compliance domain, one key.
The 200+ grounded agents are organized into specialist domains — the same crews that power each X3 Fleet Safety product. Call any of them by name over verbatim 49 CFR and live carrier data.
CSA & SMS Agents
Decompose all seven BASICs, score roadside inspections and model percentile movement over verified SMS methodology.
Hours of Service Agents
Interpret §395 duty-status, exemptions and ELD edge cases, then validate logs and flag violations.
HazMat Agents
Classification, packaging, placarding, segregation and shipping papers grounded in 49 CFR Parts 171–180.
Drug & Alcohol Agents
Part 40 and Part 382 program rules, testing pools, Clearinghouse and return-to-duty logic.
Driver Qualification Agents
Read MVRs and build driver-qualification files against §391 — endorsements, medical cards and gaps.
Permits Agents
Operating authority, state permits, IRP and IFTA requirements resolved by jurisdiction.
Audit Agents
New-entrant and DOT audit readiness — the six factors, document checklists and corrective actions.
DataQ Agents
Score whether an inspection is worth challenging and assemble the grounded RDR evidence.
Live in an afternoon.
Get a key
Request an API key and pick a plan. Free dev tier to start — no card.
Call the endpoint
Simple REST + JSON. Search the CFR, ask an agent, or pull a carrier by USDOT.
Ship it
Embed cited compliance intelligence in your product. Meter by call; scale as you grow.
{
"question": "What are the HOS 14-hour rule limits?",
"domain": "hos"
}
→ 200 OK
{
"answer": "The 14-hour limit under §395.3(a)(2) ...",
"citations": ["49 CFR 395.3"],
"grounded": true
}
Search the verified 49 CFR.
This is the same corpus search behind the API. Try "hours of service" or "drug testing pool".
Not for fleets — for the software fleets use.
TMS & ELD platforms
Add cited HOS, DVIR, and compliance answers inside your dispatch product.
Insurers & MGAs
Pull carrier safety factors by USDOT to price and monitor risk.
Brokers & shippers
Vet authority and catch fraud signals at onboarding, programmatically.
Factoring & fintech
Score carrier reliability inside your credit and payment flows.
Consultants & tooling
Build compliance apps on verified law without a regulation team.
Internal teams
Ground your own copilots and workflows in a source you can trust.
Metered by usage. Start free.
Pay for the calls you make — not per seat, not per truck.
- Free key, no card
- 1,000 CFR/corpus calls a month
- Agent & carrier calls to test
- Community docs
- Included call bucket, then metered per call
- All 200+ agents & live carrier pulls
- Higher rate limits
- Email support & SLAs
- Volume pricing & committed use
- White-label & dedicated support
- Custom domains & data feeds
- Security review & DPA
Frequently Asked Questions
Is this the same engine behind X3 products?
Yes. X3 HazMat, CSA, HOS, DataQ and the rest all call this engine. X3 API opens it to your product.
How is it grounded?
Answers are tied to the verified, current CFR text and a curated 67k-document corpus, with citations. It’s decision support — always verify against the controlling regulation.
What data can I pull on a carrier?
Authority status, safety-rating factors, and inspection signals by USDOT number — the inputs behind X3’s carrier vetting.
What are the rate limits and latency?
The free developer tier includes 1,000 calls a month at standard limits. Paid plans raise the ceiling and add higher rate limits and SLAs. Most CFR and corpus calls return in well under a second; live carrier pulls depend on the upstream source.
How do you handle security and data?
Keys are scoped per project and calls are served over HTTPS. Enterprise plans add a security review, a DPA, and volume/committed-use terms. We don’t sell your query data.
How do I get started?
Email us for a free developer key and start calling the endpoints today — see the Docs for a quickstart.
X3 API is even stronger inside X3 Compass
X3 API is one of 18+ FMCSA compliance tools built into X3 Compass — your all-in-one virtual safety director. One login runs your entire safety department from a single dashboard, with one shared driver & vehicle record across every tool.
One login, every tool
DataQ, CSA, DQ files, drug & alcohol, hazmat, permits and more — no juggling separate logins or vendors.
One driver & vehicle record
Every tool reads the same fleet data, so a driver or truck is entered once and shared everywhere.
One safety picture
See your whole fleet's compliance, scores and risk in a single command center — not ten dashboards.
One subscription for the platform. Pass-through items — MVR & background pulls, state & permit fees, and optional continuous monitoring — are billed at cost on top.