One Piece TCG Market Watch — October 2026: A Flat Month, a Falling eBay Index, and Last Month's #1 Retracted

One Piece TCG market data for October 2026: the Cardlogs index went sideways, eBay sold prices fell 4.4%, and the OP-17 Xebec is now the top corroborated card.

The One Piece TCG market went sideways in September 2026. According to Cardlogs market data, the One Piece TCG Market Cap Index rose 0.8% on TCGplayer and fell 1.4% on Cardmarket in the 30 days to September 30, while eBay sold prices fell 4.4%, down on 20 of 30 nights. The typical card moved −0.7%, after −4.9% the month before.

This is the fourth edition of the Cardlogs One Piece Market Watch. It also carries the largest correction this series has printed: the two cards we tied at #1 last month had TCGplayer prices that had not changed since May and June, and five of last month's eight corroborated gainers were repriced on one night by a change we made ourselves. Both are explained below, with the new rule we rank by.

How did the One Piece TCG market perform in September 2026?

It barely moved on two of three sources, and sold prices kept falling. All figures as of September 30, 2026:

Index base 100 on May 28, 2026. The Cardlogs Market Cap Index is chain-linked: each day's change is computed only on cards priced on both days, so new cards entering the catalog expand the cap without counting as price growth.

The two smaller moves each come from a single night. TCGplayer's whole +0.8% arrived on September 1, when the index jumped from 127.95 to 129.85; from there to September 30 it drifted down 0.65% to 129.01. Cardmarket was −0.2% through September 29, then fell 1.18% on the final night. One card did 91% of that night: the Cardmarket price of the Rocks.D.Xebec Super Alternate Art (OP17-118) reset from €11,741.57 to €3,135, a €8,607 drop inside a €9,437 net decline across every card priced on both nights.

The eBay sold leg is the only one with a trend. It fell on 20 of 30 nights, from 113.66 to 108.71, and it has now lost ground for two straight months. Sold prices led this market up in July and they are still leading it down.

Is the typical One Piece card still falling?

No. The broad selloff of late August stopped. Across 3,123 One Piece cards priced above $1 with a 30-day TCGplayer delta, the median card moved −0.70% in the 30 days to September 30, 2026, and 41.4% of cards rose. Same method as last edition, so the columns compare directly:

We checked that headline against our own nightly price log. Matching 2,715 cards on their TCGplayer price on August 31 and September 30 gives a median of −0.51%. Taking out the September 13 method night described below moves it to −0.07%. On every basis, the typical One Piece card was flat in September.

The top of the market is still frozen. According to Cardlogs market data, 62.1% of One Piece cards priced above $1,000 printed exactly 0.00% over the 30 days to September 30, 2026, barely changed from 65.1% a month earlier.

What did we get wrong last month?

Two things, and both change how this edition ranks cards.

Our #1 was two prices that had stopped updating. The September edition tied the serial-numbered Monkey.D.Luffy ST01-001 and the Monkey.D.Luffy (118) Red Super Alternate Art at $19,999 each and noted that "neither moved a cent in 30 days." Neither could have. Our nightly TCGplayer series last printed a price for the serial Luffy on May 28 and for the Red Super Alternate Art on June 15. Both cards passed our cross-venue check because Cardmarket or an eBay figure sat close to $19,999, but the TCGplayer number they were checked against was months old.

Five of our eight gainers were repriced by our own method change. On September 13, 2026 we changed how Cardlogs derives a TCGplayer price when few copies sell. A price built from recent TCGplayer sales now needs at least three sales inside 20 days, with no single sale carrying more than 40% of the weight; a card that misses that bar carries TCGplayer's own market price. On the night of September 1, 6 One Piece cards above $100 moved by 15% or more in our TCGplayer series. On September 13, 64 did, 42 of them down. Five of the cards we called September's corroborated gainers were among them:

Those prices were never "gains" in the sense we printed. They were the old method reading a thin pool of sales at the top of a range. The One Piece TCGplayer index moved only −0.1% that night, because rises and falls largely offset across the board, so the index needed no correction. The card-level tables did.

A sixth gainer gave its move back on its own: Foxy (SP), +73.6% last edition, fell from $784.99 to $463.12 on September 6.

The new ranking rule. From this edition, a card ranks only if its TCGplayer price printed in our nightly series on the ranking date AND its newest raw eBay sale in the last 60 days sits within 30% of that price. Cardmarket is shown, but no longer used to rank: four of the Cardmarket prices that would have qualified cards this month had not changed in 30 nights.

Which One Piece cards are the most expensive right now?

Ranked on the rule above, as of September 30, 2026:

A month-old card now tops the corroborated board. The Xebec Super Alternate Art has 13 raw eBay sales in our data since late August, the latest three at $5,999.99, $5,250 and $6,000. Europe disagrees sharply: Cardmarket's €3,135 converts to about $3,560, 41% under the US price, and Cardmarket's own cheapest listing is €3,400. The OP05-060 Luffy's Cardmarket price is one of the four that sat unchanged for all 30 nights.

These cards list higher and fail the rule. They are shown with every leg, because the gaps are the information:

The Red Super Alternate Art Luffy is almost certainly worth more than anything in the ranked five: Cardmarket prints €22,917 and its last raw eBay sale was $17,763.72. We just cannot attach a current US number to it. The SP Gold Luffy misses by a hair. Its newest raw sale, $9,100, sits exactly 30% under a $13,000 ask that has not changed since at least August 25, and Cardmarket's €8,264 (about $9,384) agrees with the sale. Read it as a $9,100 to $9,400 card with a $13,000 listing.

Which One Piece cards gained and lost the most in September?

Corroborated movers above $500, measured on our own nightly TCGplayer prices from August 31 to September 30, 2026. Cards whose move came from the September 13 method night are left out:

The two Nami gains are real but uneven. The Manga Nami's September sale agrees with its new price. The SP Nami sold three times near $1,000 in September, and its $1,313.18 ask sits 29% above those sales.

Sakazuki is a reversal. Last month it was a −22.8% faller and one of the three Manga rares carrying OP-16's Box EV; it is now +17.7%, with two September sales above $1,000.

The 1st Anniversary Set Luffy is the cleanest correction on the board. Its TCGplayer price fell from $1,308.47 to $643.74 on September 24 and landed between its two most recent raw sales. Last edition we ranked it as a faller at $1,185. That price was an ask the sales had already left behind.

Where did OP-17 prices land a month after release?

Lower, on both continents, and now at parity. As of September 30, 2026, 33 days after the August 28 street date:

According to Cardlogs market data, on September 30, 2026 the OP-17 booster box cost $289.88 on TCGplayer and €255.28 on Cardmarket, which converts to $289.87 at the day's ECB rate: the US and European markets priced the box within one cent of each other. On September 1, Europe was paying a 12.3% premium.

The US box is 10.4% below its $323.56 street-date price and still setting new lows. OP-16's box bottomed on day 28, 23.5% under its release price, then bounced. OP-17 has fallen less but has not turned. The US case costs 10.5% more per box than a single box, while Cardmarket's case is 1.5% cheaper per box.

Singles kept sliding. Of 164 OP-17 cards priced on TCGplayer on both September 1 and September 30, 118 fell, 38 rose and 8 were unchanged; the median card lost 20.9%, and cards that started the month at $20 or more lost a median 17.9%. The full set breakdown, including the Treasure Rare and the five manga cards, is in the OP-17 card list and price guide.

We are still not publishing an OP-17 Box EV. Cardlogs Box EV is the expected value of opening one sealed box at current singles prices, recomputed nightly per source. The TCGplayer-side figure reads $554.82, 191% of the box price, in a month when the median single fell 20.9%. The Cardmarket-side figure reads €334.24 (131% of its box). The two legs are 1.46x apart in dollars, closer than the 1.9x of late September, and still too far apart to print.

What is happening with One Piece sealed prices?

Europe cut every one of the five most expensive vintage sealed products in September. In the US three fell, one rose, and the most expensive one did not print a new price all month. As of September 30, 2026:

Apply this edition's own rule to the top row. The 1st Anniversary Set's TCGplayer price has printed $5,110.64 every night for 37 nights, while Cardmarket cut it by a third. The US number is a listing nobody is moving, and pre-errata Romance Dawn is the most expensive sealed product with a US price that still changes.

Cardlogs Box EV for the sets whose two legs agree, as of September 30, 2026:

OP-16's premium kept closing, and this month it closed from both sides: the box rose 7.8% while the EV fell 11.5%. OP-16 is still the only set in this table where opening a box returns more than it costs at today's prices, by 11%, down from 105% in August.

Did September's three watch calls come true?

Last edition named three events to watch. Graded against the data:

The third call needs its numbers. Counting only the PriceCharting eBay feed, which covers all three months, the count of One Piece cards above $1,000 with at least one raw eBay sale fell from 53 in July to 45 in August and 29 in September, out of 129 such cards. PriceCharting records some sales a few days late, so September's count may still rise slightly. Since September 5 Cardlogs also reads a second sold-listings feed, and counting it the total holds flat (95 in August, 96 in September); we compare on the feed that exists in all three months.

What should One Piece collectors watch in October 2026?

The OP-17 box against OP-16's shape. OP-16 bottomed on day 28 and bounced 27% from there. OP-17 printed its low on day 33. If $289.88 holds through mid-October, the set is following OP-16 a week late; if it breaks, it is doing something OP-16 did not.

Which side breaks the OP-17 parity. The US and Europe priced the box within one cent on September 30, after a month in which Europe fell 22% and the US 14.5%. The market that moves first from here is the one with the buyers.

Whether eBay stops leading down. Sold prices fell on 20 of 30 nights while TCGplayer prices held flat. Either sales recover toward the listings, or listings follow the sales down, which is what happened to the 1st Anniversary Set Luffy this month.

Two One Piece releases arrive inside the window: EB05 on October 30 and OP-18 on November 20, both with live card lists and presale prices. For the same monthly read across games, see our cross-game growth study. Last month's edition stays live as the September 2026 Market Watch, with a note pointing here.

Where this data comes from

Cardlogs aggregates One Piece TCG prices nightly from TCGplayer, Cardmarket and eBay sold listings (via PriceCharting): 6,978 cards priced on TCGplayer, 12,137 on Cardmarket and 8,902 on eBay sold data as of September 30, 2026, plus PSA and BGS graded prices and population data. Euro conversions use the ECB reference rate of September 30, 2026 ($1 = €0.88067).

The ranked table changed method this month. A card ranks only if its TCGplayer price printed in our nightly series on September 30 and its newest raw eBay sale within the last 60 days is within 30% of that price; raw means a listing title naming no grading company. Cards that list higher and fail are shown in a separate table with every leg. Movers are measured on our own nightly TCGplayer prices for August 31 and September 30, excluding cards whose move came from the September 13 method change, and breadth uses the same 30-day TCGplayer delta as previous editions so the columns compare month to month.

The Cardlogs Market Cap Index counts only cards priced on each source, so per-source caps are not comparable as absolute totals. It is chain-linked: each day's change is computed only on cards priced on both days, so a new set expands the cap but never registers as growth.

Every card and set in this article is tracked live, with prices, deltas, graded comps and populations, free at cardlogs.com/optcg/home and in the Cardlogs iOS and Android apps.