Demurrage & Detention: Hedge Port Fees with Event Contracts

Between April 2020 and March 2025, nine of the largest ocean carriers collected an estimated $15.4 billion in demurrage and detention (D&D) fees from U.S. shippers (FMC Detention & Demurrage, fmc.gov). Billing on that scale has kept D&D practices under close FMC scrutiny and led to the landmark 2024 billing rule. Good operations help, but they can’t remove the rare large hits. Port congestion, vessel delays, customs holds and equipment shortages are built into the system, and better scheduling doesn’t fix them.

For freight traders, ship agents and cargo owners moving containers at scale, D&D is a concentrated cost: rare, but large when it hits. Below is how event contracts on Gaduin work as a financial hedge against D&D exposure, and how they differ from cargo insurance and parametric cover.

What Are Demurrage and Detention Fees?

Demurrage: When Your Container Overstays at the Terminal

Demurrage builds up when an import container stays at the terminal past the carrier’s free time. The shipping line bills it. The port and terminal don’t. Free time varies by carrier and trade lane. It’s usually five to seven calendar days for US West Coast imports and four to five for many European trades.

Once free time runs out, daily charges start. Major carriers (Hapag-Lloyd, Maersk, CMA CGM) publish their tariffs on their websites, and the rates step up the longer the box stays. Illustrative ranges run from $75–$150 per container per day in the first tier to $200–$300 or more in later tiers. Always check the carrier tariff that applies to your shipment.

Detention: When You Hold the Box Too Long

Detention covers the time after a container leaves the terminal and before it’s returned empty to the carrier’s depot. Demurrage and detention run on two separate clocks.

A shipper can owe both: demurrage while the box sits at the terminal, then detention once it’s picked up and not returned quickly. Carrier tariffs publish detention free days and rate tiers the same way as demurrage.

How Free Days Work and When the Clock Starts

Free time is the number of days your contract lets you use the terminal or the container without extra charge. For import demurrage, the clock usually starts when the container is unloaded from the vessel and available for pickup at the terminal.

Demurrage and detention free days can’t be swapped. A shipper with seven free demurrage days and five free detention days has two separate allowances. Not picking up by day eight starts demurrage. Not returning the empty by day six starts detention.

Why D&D Costs Are Hard to Predict

Port Congestion, Equipment Shortages, and Events Outside Your Control

Demurrage and detention build up whether or not the shipper caused the delay. In 2020–2022, congestion at Los Angeles/Long Beach left vessels at anchor for weeks, and shippers got demurrage bills they disputed but often paid. The same happened at Rotterdam, Singapore and Felixstowe. Equipment shortages made it worse. Even shippers ready to collect containers couldn’t always find drayage capacity or chassis.

The FMC’s investigation found widespread billing for periods when shippers had no reasonable way to pick up or return equipment (FMC D&D Rulemaking, fmc.gov). Shippers paid regardless of who was at fault.

The FMC Rule (2024): More Transparency, Same Exposure

In February 2024, the FMC published its final rule on demurrage and detention billing requirements under the Ocean Shipping Reform Act of 2022 (OSRA-22), effective May 2024. The rule imposed:

Invoice content requirements (vessel name, container number, free-time dates, rate applied)
A 30-calendar-day maximum between the last free-time day and invoice issuance
A dispute resolution timeline obligating carriers to respond within 30 days

The U.S. Court of Appeals for the D.C. Circuit vacated one provision (§541.4, governing who may be billed) in September 2025, but the billing-transparency and dispute-timeline provisions remain in force.

In practice, shippers now have better records and more leverage in disputes. The fees still build up.

Typical D&D Rate Tiers

D&D rates vary widely by carrier, trade lane and contract. The table below shows an illustrative structure typical of US West Coast imports. Always check your carrier’s tariff.

Period	Illustrative Demurrage Rate	Illustrative Detention Rate
Free days	$0	$0
Days 1–5 over free time	$75–$150/container/day	$75–$125/container/day
Days 6–10 over free time	$150–$200/container/day	$125–$175/container/day
Day 11+ over free time	$200–$350/container/day	$175–$250/container/day

Illustrative only. Check the applicable carrier tariff for your shipment.

The Traditional Playbook and Its Limits

Operational Mitigation

The usual steps are booking drayage early, tracking vessel and terminal status with cargo visibility tools (such as FourKites, VIZION or Portcast), negotiating extra free time into carrier contracts and pre-clearing customs. These cut D&D exposure but leave the rare large delays in place. Once a vessel arrives ten days late, no operational step can undo it.

Cargo Insurance: What It Covers and What It Does Not

Standard marine cargo policies (Institute Cargo Clauses A, B and C) cover physical loss of and damage to goods in transit. Delay costs, including D&D, are usually excluded. ICC Clause 4.5 explicitly excludes loss, damage or expense caused by delay. Some specialist products offer delay extensions, but D&D is often excluded or capped by sublimits well below what you’d owe at a congested port.

For a side-by-side look at what cargo insurance covers and what event contracts cover, see Cargo Insurance vs Event Contracts.

Parametric Solutions: Closer, But Different

Parametric delay cover uses an objective trigger, usually actual vessel arrival against scheduled ETA, to pay a fixed amount without proof of loss. It pays faster than indemnity insurance, usually in days instead of the weeks or months an indemnity claim takes.

It differs from event contracts in important ways:

Insurance framework: parametric cover is an insurance product. It’s subject to underwriting and to the insurer’s own credit risk.
Fixed amount: the parametric payment is set in advance and isn’t sized to the D&D you actually owe. Basis risk can be large.
Fiat settlement: payment is in fiat currency. It’s faster than indemnity insurance but still takes days to weeks.

For a broader comparison of parametric products and event contracts, see Parametric Insurance vs Prediction Markets.

How Event Contracts Work as a D&D Hedge

The Core Mechanics: An Objective Metric and a Fixed Threshold

An event contract on Gaduin is a position on how one named vessel’s arrival goes: on time, delayed or cancelled. The terms are fixed when the market opens and can’t change after that. They name the vessel, the destination port and how far past the arrival estimate set at the open counts as delayed. In Gaduin voyage markets that threshold is 24 hours. The market settles on the destination port’s published arrival record, compared with that estimate. A share pays $1 if its outcome is the one that happens and $0 if it isn’t.

An outcome’s price is the chance the market gives it. An outcome at 40¢ has a 40% chance, and the three outcome prices in one market add up to 100%. Traders who think congestion risk is underpriced buy Delayed. Those who think it’s overpriced buy On time. Neither needs a logistics relationship or a shipping document to trade.

Settling Against the Record vs Claiming Against a Carrier

A D&D claim is settled by argument: who held the box, who was ready to collect it and whose fault the congestion was. An event contract is settled by measurement. Settlement never asks what caused the delay, and nobody at Gaduin decides the outcome. The terms were fixed when the market opened, the published arrival record is compared with the estimate set at that same moment, and the market settles on that comparison. Before it closes, the price moves as people trade.

That’s a different process from filing a D&D dispute with a carrier under the FMC rule or making an indemnity claim. You don’t need proof of loss, evidence of the delay’s cause or a negotiation with the shipping line. For more on how these markets work, see Market Structure Explained.

USDT Settlement: Why Speed Matters When Fees Accrue Daily

D&D fees add up every day. A ten-day overstay on twenty containers at $200 per container per day comes to $40,000 on a known schedule. A hedge needs to pay before the next freight invoice cycle.

Gaduin settles event contracts in USDT automatically, once the destination port’s published arrival record is in and the market’s tracking window has closed. A parametric product takes days to weeks, an indemnity claim takes weeks to months, and the FMC rule gives carriers 30 days to respond to a dispute. That speed fits the daily build-up of D&D charges. Gaduin accepts USDT (ERC-20) deposits only. See the deposits FAQ.

Example Scenario

The following is illustrative and does not represent any specific Gaduin contract, threshold, or settlement amount.

A cargo owner has 20 containers inbound to Los Angeles/Long Beach. From current congestion data and past arrival patterns, the trader sees a real chance that the vessel arrives far enough behind its set arrival estimate to push the boxes past free time, where the higher demurrage tiers start.

The trader checks the Gaduin markets open on that vessel’s arrival. Delayed is priced below the trader’s own estimate of the chance, which suggests the market may be underpricing congestion risk. The trader buys Delayed, sized to offset part of the expected D&D cost.

If the vessel arrives more than 24 hours past its set estimate, the threshold in Gaduin voyage markets, the Delayed shares pay out in USDT. If it arrives within free time, no D&D builds up, and the trader’s loss is the known cost of the position. The contract doesn’t cover D&D dollar for dollar. It pays on the delay itself, whatever charges are actually billed.

Who Can Use D&D Event Contracts?

Importers and Beneficial Cargo Owners

Importers who hold containers in their own name or as named consignees on the bill of lading carry D&D costs directly. For BCOs moving large container volumes through congestion-prone ports, D&D is a recurring P&L line. A position taken before the vessel arrives pays out if the delay happens.

Ship Agents and NVOCCs

Non-vessel-operating common carriers (NVOCCs) and ship agents are often contractually liable for D&D under their master bills of lading, even when terminal or vessel problems outside their control caused the delay. Across a full book of shipments, that can add up to a lot. Event contracts let NVOCCs take positions on congestion at their key terminals across the whole book.

Commodity Traders with Regular Port Exposure

Commodity traders running monthly or quarterly cargo programs through major ports, such as grain through the Gulf, base metals through Rotterdam or energy at Singapore, build up predictable D&D costs in line with their volumes. Because that exposure repeats, it suits a regular hedging program, the way forward freight agreements (FFAs) are used to hedge freight rates. For vessel delays at specific chokepoints, see Strait of Hormuz Vessel Delay Contracts.

Event Contracts vs. D&D Coverage: Side by Side

	Cargo Insurance	Parametric Cover	Gaduin Event Contract
Covers D&D directly?	Rarely (ICC delay exclusion)	Partial (fixed notional)	No. It pays on the arrival threshold
Settlement speed	Weeks to months	Days to weeks	Automatic, on the published record
Who decides the payout	The insurer’s adjuster	The insurer’s trigger calculation	No one. The published arrival record decides
Requires loss proof?	Yes	No (parametric)	No
Settlement currency	Fiat	Fiat	USDT
Regulatory framework	Insurance license (onshore)	Insurance license (onshore)	Offshore event-contract platform
Basis risk	High (D&D often excluded or capped)	Medium (fixed vs actual)	Medium (threshold vs actual D&D)

Getting Started

To decide whether a D&D hedge makes sense for a shipment or a portfolio:

Find your D&D exposure window: which vessel arrivals in the next 30–90 days carry the most congestion risk?
Check available contracts: see which vessel arrival markets Gaduin lists for your trade lanes and ports.
Check the price: an outcome’s price is the chance the market gives it right now. Compare it with your own estimate.
Size the position: event contracts are financial instruments and don’t indemnify you. Size the position against your D&D exposure and don’t expect it to replace charges dollar for dollar.

For how settlement works on the platform, see how settlement works.

Gaduin is an offshore transport event-contracts platform. Event contracts on Gaduin are financial instruments settled in USDT against the official published arrival record for the journey the market names. They are not insurance policies, not cargo claims, and not demurrage or detention waivers. Gaduin is not a freight forwarder, shipping line, or licensed insurer. Trading event contracts involves financial risk; settlement outcomes depend on the published arrival record, not on actual D&D charges billed. This article is for informational purposes only and does not constitute financial, legal, or logistics advice. Gaduin is not available to US persons or residents of restricted jurisdictions.