LAYDAY auto-assembles the per-container evidence that wins demurrage and detention disputes, before the 30-day window closes. This is dispute-preparation support, not legal advice.
For a judge who has never heard the word:
Demurrage is the fee an ocean carrier charges when your full container sits at the terminal too long. Detention is the fee for keeping the carrier's empty equipment past its allowed time. Both are charged per container, per day — and importers pay them constantly, often without the records needed to contest them.
Under the FMC's billing rule, 46 CFR Part 541 (effective May 28, 2024):
These are verified FMC figures — penalties paid to the U.S. Treasury and adjudicated outcomes, not marketing estimates.
In DK Butterfly-1 (f/k/a Bed Bath & Beyond) v. OOCL, FMC Dkt 23-02 (ALJ Initial Decision, Apr 24, 2026), the company was awarded $45,600,599.25 on its service-contract and refusal-to-deal claims — and its D&D claims were dismissed. The ALJ found "no violations… for detention and demurrage" because a sophisticated, fully-documented party could not marshal per-container proof of unreasonableness. If they couldn't assemble it, few can. That gap is the product.
Not "find a missing field." LAYDAY auto-assembles the per-container evidence pack that wins a D&D dispute.
For each billed container, LAYDAY reconstructs free time against the real event record — vessel discharge, container availability, gate-in/gate-out timestamps, appointment windows, and terminal closures — and lines it up against the carrier's stated free-time window and the actual charge. The output is a source-cited, per-container dossier showing exactly which days were billed when the required action was physically impossible.
That is the argument that carried every on-the-merits D&D matter in the record: the terminal was closed (TCW), no return location was given (Wan Hai), no appointments existed during free time (ONE), the wrong rate tier was applied (MSC overcharge count). It is jurisdiction-independent — it survives regulatory churn.
Every dispute LAYDAY supports is logged with its outcome, defect type, and the evidence that carried it — each tied to a primary FMC source, independently checkable. The seed is 9 high-fidelity, primary-sourced FMC decisions encoding precisely which arguments win on which facts.
We will not show you a roadmap dressed up as shipped features. Here is exactly what works today and what does not.
POST /invoices, GET /invoices/{id}/findings/findings as recomputedPOST /invoices/{id}/dossier (always draft)GET /invoices/{id}/deadlinedraft and stays draft; transition to sent is a human action, out of band. Nothing is transmitted to any carrier or the FMC by this system.We state these before you have to ask.
We are looking for 20–50 real, consented D&D invoices from forwarders and NVOCCs to measure the actual defect rate. Leave an email and we will send the pilot one-pager.