TL;DR
1. The proxy service fee: three models
This is the fee the proxy charges for buying on your behalf, and it comes in three structures. None is inherently a rip-off — they suit different buying patterns.
- Flat fee per item or per order.Predictable, and it doesn't grow with item value — the natural fit for buyers of higher-value items like graded cards, where a percentage would sting.
- Proportional (a percentage of item price). Cheap on low-value items, increasingly expensive as prices rise. Fine for small hauls of inexpensive goods.
- Capped percentage. A percentage with a maximum — a middle ground that behaves proportionally at the low end and like a flat fee at the high end.
How to audit it:find the official fee page (every legitimate service has one), and compute the fee for one item at your typical price point — not the service's example price point. Fee schedules change, so check the current page rather than a review from last year.
2. Exchange-rate markup
Most proxies bill you in your own currency, converting from JPY at a rate they set. The gap between their rate and the mid-market rate is a real cost, even though it never appears as a line item. As of 2026, a markup of 1–2% over mid-market is normal industry practice.
How to audit it:on the day you're charged, look up the mid-market JPY rate, then divide what you paid by the item's JPY price. If the implied rate is within a couple of percent of mid-market, that's standard. If it's far off, treat the difference as an extra fee and factor it into your comparison.
3. Japan domestic shipping
The seller ships to the proxy's Japanese warehouse, and that domestic postage is passed to you. On some marketplaces the seller covers it; on others it's added at checkout. It's usually modest, but it's per-seller — buy from five sellers and you may pay it five times.
How to audit it: check whether the listing says shipping is included, and whether the proxy passes domestic postage through at cost or adds a handling margin on top.
4. Consolidation and storage fees
Combining several purchases into one international box is where proxies save you real money — but the warehouse side has its own fees. Most services offer a free storage window, then charge per day after it ends, and some charge separately for the consolidation work itself.
How to audit it: before buying, note the free-storage period, the daily rate after it, and whether repacking/consolidation is a separate charge. If you buy slowly over weeks and ship once, storage fees can quietly outgrow the shipping savings.
5. International shipping and volumetric weight
International carriers charge by the greater of actual weight and volumetric (dimensional) weight — a formula based on the box's size. A large box of light items bills like a heavy one. This is often the single biggest line on the invoice, and it's also the one good packing influences most.
How to audit it:compare the carrier options the proxy offers against the carrier's own published rates for the same weight, and ask whether the service packs compactly (smaller box, lower volumetric weight) or just drops items into an oversized carton.
6. Payment processing fees
Some services add a percentage for card payments or certain payment providers, and your own card may add a foreign-transaction fee on top if the charge is processed outside the U.S. These fees sit at checkout, after you've mentally committed — which is exactly why they're worth checking first.
How to audit it:read the payment-methods page for surcharges, and check your card's foreign-transaction terms. Paying in the proxy's billed currency vs your home currency can also change what conversion happens where.
7. U.S. import duty and clearance fees
The last charges arrive after the box leaves Japan. As of 2026, imports from Japan carry a 12.5% Section 301 duty on the item value (in force since July 24, 2026), and the carrier bills a clearance fee of roughly $9–17 per parcel for handling customs. These are U.S.-side charges, not proxy fees — but they belong in your total cost math all the same.
How to audit it: multiply your item subtotal by 12.5% and add one clearance fee per parcel. Full details, carrier-by-carrier, are in our 2026 import tax guide.
The 7-point fee audit checklist
| # | Fee | What to check before buying |
|---|---|---|
| 1 | Service fee | Flat, proportional, or capped? Compute it at your typical item price from the official fee page. |
| 2 | FX markup | Implied rate vs mid-market on the day — within ~1–2% is normal as of 2026. |
| 3 | Japan domestic shipping | Included in the listing or added? Passed through at cost or marked up? |
| 4 | Consolidation & storage | Free-storage days, daily rate afterward, separate repacking charge? |
| 5 | International shipping | Volumetric-weight billing; compare against the carrier's published rates. |
| 6 | Payment fees | Card/provider surcharges plus your own card's foreign-transaction fee. |
| 7 | U.S. import charges | 12.5% duty on item value + ~$9–17 carrier clearance per parcel (as of 2026). |
Quick answers
Are hidden fees a sign a proxy service is a scam?
Usually not. Most “hidden” fees are legitimate charges that simply aren't shown prominently — FX markup baked into a rate, consolidation charges after free storage runs out, or payment processing fees added at checkout. The fix is auditing the full fee list before you buy, not assuming fraud.
How do I check a proxy service's exchange-rate markup?
Look up the mid-market JPY/USD rate for the day (any major finance site shows it), then divide the USD amount the proxy charged by the JPY item price. If the implied rate is within roughly 1–2% of mid-market, that's normal industry practice as of 2026. A much larger gap is effectively an extra fee.
Why did I get billed again when my package arrived in the U.S.?
That's import duty and the carrier's clearance fee, not a proxy fee. As of 2026, Japanese goods carry a 12.5% Section 301 duty on the item value, and carriers charge roughly $9–17 per parcel to clear customs. Unless you paid for prepaid-duty (DDP) shipping, these are billed on the U.S. side at or before delivery.
What is volumetric (dimensional) weight?
Carriers charge international shipping by the greater of actual weight and volumetric weight, which is calculated from the box's dimensions. A big, light box can cost as much to ship as a heavy one. Good consolidation — compact, well-packed boxes — is how you keep this down.
Is a proportional service fee always worse than a flat fee?
No — it depends on what you buy. Proportional fees can be cheaper on very low-value items, while flat fees win as item value rises because the fee doesn't scale with price. Capped-percentage models sit in between. Run the numbers for your typical purchase instead of assuming.
The bottom line
None of these fees is a scam — but any of them can surprise you if it's not published clearly. The services worth using are the ones that let you complete the checklist above from their public pages alone. As one example of what transparent pricing looks like: Kangaroo Japan charges a flat ¥200 per itemservice fee as of 2026, published on its fees page along with every other charge — no math required after checkout. Whichever service you choose, if you can't find a number, that's your answer about the number.
Next up: see how the generalist and specialist models compare in practice in our honest Buyee review and the three-way proxy comparison, or dive into marketplace tactics with how to buy from Mercari Japan.