Terms of Service

The terms governing use of HallucinX, the citation verification service operated by Z-Labs, LLC.

Effective date: May 18, 2026 Last updated: May 28, 2026

These Terms of Service ("Terms") govern your use of HallucinX, a citation verification service operated by Z-Labs, LLC. By creating an account or paying for a subscription, you agree to these Terms.

If you do not agree, do not use the service.

The product

HallucinX extracts citations from a legal brief and verifies each one against CourtListener's public database of judicial opinions. It returns a structured report identifying citations that are verified, unverified, or otherwise flagged for attorney review.

HallucinX is an audit aid, not a substitute for attorney review.

The service does not provide legal advice, does not constitute legal representation, and does not create an attorney-client relationship between Z-Labs, LLC and any subscriber, attorney, client, or other person. Output is informational. Every flag is a prompt for review, not a finding of fabrication. Every verification is a database match, not an opinion on legal sufficiency.

Subscription

HallucinX is offered as a single monthly subscription tier at launch.

Price. $29 per month, billed monthly in advance via Stripe.
Usage cap. 100 brief-units per calendar month. A brief-unit is defined in the Usage limits section below. The cap is a hard ceiling — there are no overage charges, no usage-based billing, and no rollover of unused brief-units to the following month.
Auto-renewal. Subscriptions renew monthly until canceled. Cancellation takes effect at the end of the current billing period; the service remains available through that period.
Billing region. US billing only at launch. Subscribers outside the United States are not supported.
Firm accounts. A firm tier covering multiple named attorneys is planned but not offered at launch.

Usage limits

A subscription includes processing of up to 100 brief-units per calendar month.

A brief-unit is defined by character count, not by document count. Each 100,000 characters of extracted text from an uploaded document counts as one brief-unit, rounded up. A document of any length up to 100,000 characters counts as one brief-unit. A document of 100,001 to 200,000 characters counts as two brief-units. A document of 200,001 to 300,000 characters counts as three brief-units, and so on.

Character count is measured against the text extracted from the document by HallucinX's verification engine — the same text that is sent through the citation extraction and verification pipeline. This means scanned PDFs are measured by the text recovered through OCR, not by file size or page count.

Federal appellate principal briefs are capped by court rule at approximately 80,000 characters. The 100,000-character brief-unit threshold is intended to accommodate substantially all single-brief submissions as one unit. Submissions exceeding the threshold typically reflect either unusually long filings or multiple briefs combined into a single upload; in both cases, the brief-unit count reflects the verification work performed.

Brief-unit counts reset on the first day of each calendar month. Submissions exceeding the monthly cap will be queued until the next month or, at subscriber's election, addressed by contacting support.

Submission throughput

To ensure consistent service quality and respect rate limits imposed by upstream data providers, HallucinX may queue submissions when a subscriber submits multiple briefs in rapid succession or during periods of unusually high concurrent demand across the platform, and may apply platform-level limits on submission rate and per-brief processing time. These platform limits are enforced at the engine level and may be adjusted to manage capacity. Queuing and these limits do not consume the subscriber's monthly brief-unit allowance. Queued submissions complete in standard order; status is visible from the verification page while queued. A submission that cannot be processed within the engine's per-brief time limit is rejected with an explanatory error and does not consume a brief-unit.

Platform limits

The service imposes the following limits on individual submissions and on submission rate:

Per-submission limits. Submissions must be PDF or DOCX format, may not exceed 25 megabytes in file size, and may not exceed approximately 250,000 characters of extracted text. Documents exceeding the character limit are rejected at intake.

Splitting a single brief into multiple uploads to work around the per-submission limit is technically possible but produces lower-quality verification: short-form citations (such as "Brown at 495") that reference a full citation across the split boundary cannot be linked to their antecedent, and the table-of-authorities analysis runs against only the portion of the document in each upload. Subscribers with regularly large submissions should contact support@hallucinx.com to discuss whether a future firm tier or processing-capacity adjustment fits their needs.

Per-account submission rate. To preserve consistent service quality, individual subscribers are limited to one submission per minute and twelve submissions per hour. Submissions exceeding these rates are queued and complete when capacity is available, without consuming the subscriber's monthly brief-unit allowance.

These limits may be adjusted from time to time and are not part of the material-change category requiring 14-day notice under the Modifications section, unless the adjustment is to reduce capacity below the levels stated here.

Acceptable use

Each HallucinX subscription authorizes one named attorney to use the service.

Named attorney. The subscription is bound to a single attorney whose name is provided at signup. That attorney is the responsible party for all use of the account.
Staff submission. Paralegals, legal secretaries, associates assisting on a matter, and other staff may submit briefs to HallucinX on behalf of the named attorney. This reflects the realistic workflow of a law practice and is permitted.
Credential sharing across attorneys is prohibited. A subscription may not be used to verify briefs filed under the name of any attorney other than the named attorney on the account. Firms with multiple attorneys filing under their own names need a subscription per attorney until the firm tier is offered.
Lawful use. Subscribers may not use the service for any unlawful purpose, to upload material they do not have the right to upload, or to attempt to disrupt or reverse-engineer the service.

Violation of this section is grounds for termination under the Termination section below.

Professional responsibility

Use of HallucinX does not change the professional-responsibility duties of the named attorney.

Verification remains the attorney's duty. ABA Model Rule 1.1 (competence), Rule 3.3 (candor toward the tribunal), and Federal Rule of Civil Procedure 11 obligations remain with the attorney regardless of any tool, including this one. The attorney must independently verify every citation in any brief filed in court.
UNVERIFIED is not fabricated. A citation marked UNVERIFIED means the citation could not be located in CourtListener's coverage at the time of the lookup. It does not mean the citation is fabricated. The attorney must investigate flagged citations against primary sources.
Coverage gaps are real. CourtListener's coverage is broad but not complete. State court coverage varies by jurisdiction, and very recent opinions may not yet be indexed. The service does not represent that a citation it cannot locate is invalid.

The service is designed to support the verification step required by professional responsibility rules. It does not replace it. HallucinX is an audit aid, not a substitute for attorney review.

Data handling

Documents submitted to HallucinX are processed in memory and discarded after the verification report is generated. Only citation strings — for example, "Smith v. Jones, 123 F.3d 456" — and structural metadata about where each citation appears in the document (such as whether the citation sits in a table of authorities or in the body of the brief) transit to HallucinX's verification engine and, for citation strings only, onward to CourtListener's public Citation Lookup API. No part of the document content other than the citation strings and their structural metadata leaves the user's browser, and nothing about the document is written to a database, log file, or other persistent storage.

This is an architectural property of the service, not a discretionary policy. The verification engine runs on third-party cloud infrastructure operated under Z-Labs, LLC's account; it receives only citation strings and structural metadata from the user's browser, processes them in memory, and discards them. Z-Labs, LLC could not produce stored copies of subscriber documents in response to a subpoena, discovery request, or any other demand, because no such copies exist.

For the full data posture, including subprocessors, retention periods, and subscriber rights, see the Privacy Policy.

30-day money-back guarantee

Z-Labs, LLC offers a full refund of the initial subscription payment for any reason, requested within 30 days of the date the subscription begins.

Eligibility. Available to first-time subscribers within 30 days of initial subscription. Not available on resubscription after a prior cancellation.
No usage condition. The refund is not contingent on usage volume. A subscriber who used the service to verify briefs during the period — including up to the full 100-brief monthly cap — remains entitled to the refund.
How to request. Email support@hallucinx.com within the 30-day window. The refund is issued via Stripe to the original payment method.
After the 30-day window. Standard monthly cancellation applies. Cancellation may be initiated at any time and takes effect at the end of the current billing period; fees already paid for the current period are not refunded.

Disclaimers and liability

The service is provided "as is" and "as available." Z-Labs, LLC makes no warranties, express or implied, including no warranty of merchantability, fitness for a particular purpose, or non-infringement. Z-Labs, LLC does not warrant that the service will be uninterrupted, error-free, or free of harmful components, or that any verification result is accurate, complete, or suitable for any particular legal use.

To the maximum extent permitted by law, Z-Labs, LLC is not liable for any sanctions, professional discipline, malpractice claim, judgment, settlement, lost matter, or other consequence arising from the use of, or failure to use, HallucinX output. The professional-responsibility duties of the named attorney are unaffected by use of any tool, including this one.

Liability cap. Z-Labs, LLC's total aggregate liability under these Terms, whether in contract, tort, or otherwise, is limited to the total fees paid by the subscriber to Z-Labs, LLC in the twelve months preceding the claim. This cap applies in the aggregate to all claims arising from the same or related events.

Some jurisdictions do not allow the exclusion of certain warranties or the limitation of certain liabilities. In those jurisdictions, the exclusions and limitations apply to the maximum extent permitted by applicable law.

Termination

Either party may terminate this agreement.

Subscriber-initiated. A subscriber may cancel at any time from the account page. Access continues through the end of the current billing period. No partial-month refunds, except as expressly provided under the 30-day money-back guarantee above.
Z-Labs, LLC-initiated. Z-Labs, LLC may suspend or terminate access for violation of these Terms, including credential sharing across attorneys, attempted abuse of the service, or use for any unlawful purpose. Termination for cause does not entitle the subscriber to a refund of fees already paid.
Effect of termination. On termination, the subscription ends and account data is deleted within 30 days, consistent with the retention schedule in the Privacy Policy. Billing records required for tax and accounting purposes are retained as required by law.

Sections that by their nature should survive termination — including Disclaimers and liability, Governing law and disputes, and any accrued payment obligations — survive.

Modifications

Z-Labs, LLC may update these Terms from time to time.

Material changes — including changes to the subscription price, the usage cap, or the liability or arbitration provisions — will be communicated to active subscribers by email at least 14 days before the effective date.
Continued use of the service after the effective date constitutes acceptance of the updated Terms.
A subscriber who objects to a material change may cancel before the effective date and receive a prorated refund of the current billing period.
Non-material changes — typographic corrections, formatting, contact-information updates — take effect when posted, with a corresponding update to the "Last updated" date above.

Governing law and disputes

These Terms are governed by the laws of the State of Colorado, without regard to its conflict-of-laws principles.

Informal resolution first. Before filing any formal proceeding, the subscriber agrees to contact legal@hallucinx.com and attempt to resolve the dispute in good faith for at least 30 days.
Arbitration. Disputes that cannot be resolved informally and that exceed the small-claims jurisdictional threshold will be resolved by binding arbitration administered by the American Arbitration Association under its Commercial Arbitration Rules. Arbitration takes place in the State of Colorado or by remote proceeding.
Small claims preserved. Either party retains the right to bring an individual claim in small-claims court for any matter within that court's jurisdiction.
No class actions. Disputes are resolved on an individual basis. Class arbitrations and class actions are not permitted.

Nothing in this section limits a subscriber's right to bring a complaint to a state attorney general or other government regulator.

Contact

For legal notices under these Terms — including service of process, notices of objection to modifications, and termination notices — contact:

legal@hallucinx.com

For refund requests, account questions, and billing issues, contact support@hallucinx.com. For privacy questions and data subject requests, see the contact information in the Privacy Policy.

Ask your bar association if HallucinX is right for you.