My First Week Selling on Cardmarket: Listing 35k Bulk Cards and Analyzing the Results

The Goal: Moving Beyond a Single Marketplace

For the first five weeks of this challenge, all sales were happening on Ricardo, which is the Swiss equivalent of eBay. To really scale up, the next logical step was to get the bulk inventory—around 40,000 to 50,000 cards—listed on major European platforms like Cardmarket and Card Trader.

This is a critical move. While a local platform is a good start, tapping into the larger, dedicated TCG marketplaces is necessary to move the volume of cards required to hit ambitious sales goals.

Preparing Inventory Data for a Multi-Platform Launch

Before you can upload anything, your data has to be clean. The first step was fixing inventory mistakes in the source file. This meant correcting entries for non-holo variants that were mixed in and, more importantly, getting the correct Cardmarket IDs for each card.

This can be a tedious process. The Cardmarket catalog can be tricky to navigate programmatically, and it took a few rounds of work with a tool like ChatGPT to get all the IDs properly mapped in the CSV file.

Using Software for Listing and Pricing

With a clean CSV file, the next step was using a third-party tool, TCG PowerTools, to manage the upload. The process involves importing your file and defining which columns correspond to the necessary data points: Cardmarket ID, condition, expansion, language, and so on.

The software also allows for setting up auto-pricing rules. For this inventory, the rule was set to price cards at 115% of the Cardmarket trend price, with a fallback minimum value of 12 cents for any card. This automates one of the most time-consuming parts of listing bulk.

The Cardmarket Listing Experience: Be Prepared to Wait

Once the pricing rules were set, the tool began syncing the inventory to Cardmarket. This is where the reality of dealing with large platforms and their APIs comes in. It's not an instant process.

I chose like I think 5,000 cards and it took very long. So like 12 hours and next morning... it was still working.

The final sync for the entire inventory of over 35,000 cards (representing 9,600 unique listings) took a total of 16 hours. This is a crucial factor to consider for your own workflow. Every time you need to update your stock—pulling it down, adding new cards, and pushing it back up—you may be facing a significant delay.

A Tale of Two Platforms: Card Trader's Speed

The same tool was used to sync the inventory to Card Trader, and the experience was completely different. In contrast to Cardmarket's 16-hour sync time, the entire inventory was live on Card Trader in just a few minutes.

This is a huge advantage. The speed means you can update inventory much more frequently without major downtime. With both platforms synced, the total listed value now sits at over $10,000 on Cardmarket and another $10,000 on Card Trader, all from the same pool of bulk cards.

Initial Sales Results: The Best Week So Far

With listings live on three platforms, the results were immediate. This week was by far the highest revenue week in the challenge, hitting nearly $1,000. It's important to note that a large chunk of this came from a high-value PSA card auction on Ricardo, with one card selling for over $300.

However, looking at profit gives a clearer picture of the new platforms' impact. The weekly profit reached $160. Of that amount:

• ~$50 came from Cardmarket.
• ~$40 came from Card Trader.
• The remaining ~$70 came from Ricardo.

Even in the first 4-5 days of being live, the new platforms contributed over half of the week's profit. It's a clear sign that expanding your sales channels works.

What's Selling on the New Platforms?

An early observation is that some of the first items to sell on Cardmarket were more expensive Trainer cards. This suggests that active players are browsing the new inventory to find cards they need for their decks.

This raises a good question for any seller: will this initial sales velocity hold, or will it dip once the most in-demand cards are gone? It's something to monitor in the coming weeks as the inventory settles.

Side Projects: Sourcing and Master Sets

Alongside the main bulk listing project, other activities continue. A small collection was purchased for about $60, yielding a mix of EX cards and Japanese boosters. Most of the EX cards will be listed as singles on Ricardo, while duplicates are being set aside for use in future repacks or lot boxes.

The strategy of selling complete master sets, however, has hit a snag. After two weeks on Ricardo, there hasn't been a single sale. The next step is to give it another week before considering a price adjustment.

The Takeaway and What's Next

After six weeks, the total profit stands at nearly $400. While this is still far from the pace needed to hit the $50,000 goal, this week was a major step forward. Adding Cardmarket and Card Trader has already proven to be a profitable move.

The key lessons are that data prep is essential, listing software is a massive time-saver, and different platforms have vastly different technical behaviors. The long sync time for Cardmarket is a real operational hurdle to plan around. The plan for next week involves listing the newly acquired EX cards, adding more cards to complete German master sets, and another large bulk purchase.