Square doesn’t connect to eBay on its own. If you sell at a counter and on eBay, a Square eBay integration app is what keeps one stock count across both, so the vintage lamp that sells in the shop at 11 am doesn’t sell again on eBay at 11:05.
These are the five Square eBay integration apps worth considering, and the biggest difference between them isn’t features. It’s what they charge you for: items, orders, listings or sales value. For a shop that rings up hundreds of small sales at the counter, that choice can mean the difference between $19 and $59 a month.
This guide compares all five integration apps on price, sync speed and fit, using each app’s Square App Marketplace listing, checked in November 2026. QuickSync is our product, so we’ve kept its limits in plain view next to everyone else’s.
Best Picks for Square Sellers Selling on eBay at a Glance
Short answer: QuickSync is the best fit for most Square shops selling on eBay. It starts at $19 a month, charges by items rather than orders, and picks up counter sales the moment Square reports them. Choose Trunk if you want simple stock sync and sell under 100 orders a month, LitCommerce if eBay is one of many marketplaces, M2E if your eBay sales are small, and Finale Inventory if you need a full warehouse system.
Does Square integrate with eBay?
No. Square has no built-in eBay connection. When a seller asked on the Square Community, a moderator answered that the link would have to be built by a third party using Square’s APIs. Square’s App Marketplace lists the apps that fill the gap.
You may also see Zapier suggested. Its ready-made zaps can update Square inventory or create a Square order when a new eBay order comes in. That covers one direction only: a sale at your counter still won’t lower the quantity on eBay. If you sell one-of-a-kind items in both places, that’s the direction that matters most.
Quick View of the 5 Square eBay Integration Apps
| App | Best for | Starts at | You pay by | Rating (reviews) | Free trial |
|---|---|---|---|---|---|
| Square eBay Integration by QuickSync | Counter plus eBay and other shops, any order volume | $19/mo | Items; orders unlimited | 5.0 (78) | 14 days |
| Trunk | Simple stock sync, low order volume | $35/mo | Orders, including counter sales | 5.0 (90) | 14 days |
| LitCommerce | Listing on eBay and many other marketplaces | $29/mo | Listings and channels | 4.9 (34) | 7 days |
| M2E Multichannel Connect | Small eBay sales on a tight budget | Free | Monthly order sales | 3.0 (2) | 30 days |
| Finale Inventory | Warehouses and purchasing, not just sync | Listed from $99/mo | Quote | 4.9 (15) | 14 days |
Square eBay App Pricing Compared: Which Offers the Best Value?
Each app measures your shop differently, and for a Square seller that matters more than for most. Your counter creates far more orders than eBay does, so an app that counts every order can cost more than one that counts items.
- Items (QuickSync): you pay for the number of product variants you sync. Orders are unlimited.
- Orders (Trunk): you pay by orders a month. Trunk counts “an actual order that has been placed by one of your customers,” so counter sales count too.
- Listings and channels (LitCommerce): the base price covers 1,000 listings across 3 channels.
- Order sales value (M2E): you pay by the dollar value of orders each month.
- Quote (Finale): priced for your setup.
Example: an antiques shop with 800 items
Say you have 800 items, ring up 250 sales a month at the counter and sell 60 items a month on eBay at around $40 each. That’s 310 orders and about $2,400 of eBay sales. Here’s the cheapest plan on each app that covers it:
| App | Plan | Monthly cost | Why |
|---|---|---|---|
| QuickSync | Lite | $19 | 800 items fits under 1,000; orders don’t count |
| LitCommerce | Pay As You Go | $29 | 800 listings fits under 1,000 |
| Trunk | Essential | $59 | 310 orders falls in the 201 to 400 band |
| M2E | Starter 5K | $19 or more | $2,400 of sales is under its $5,000 band, if only marketplace orders count |
| Finale Inventory | Quote | From $99 | Listed range $99 to $649 |
If you also want eBay orders copied into Square so you can fulfill from there, QuickSync needs Pro at $29, which is still below Trunk’s price for this shop.
How Fast Does Stock Update Between Square and eBay?
The two sides behave differently. Square announces a sale as it happens, so an app that listens can react at once. eBay doesn’t send QuickSync that kind of notice, so QuickSync and LitCommerce both check eBay on a schedule. That gives you two speeds to compare:
- Counter sale to eBay: QuickSync receives a Square sale immediately and pushes the new count to eBay without waiting for a scheduled check. Trunk describes its stock sync as real time.
- eBay sale to Square: QuickSync checks eBay every couple of minutes for both stock and orders. LitCommerce’s Square eBay page says it syncs pricing, inventory and order data every 15 minutes. M2E and Finale don’t publish an interval on their Square listings.
For a shop selling one-off items, those minutes are the overselling window. If you list antiques, collectibles or vintage pieces in both places, a shorter gap means fewer cancelled eBay orders, and eBay counts a cancellation for being out of stock against your seller standing. Our guide to cancelling an eBay order as a seller explains how.
1. Square eBay Integration by QuickSync
QuickSync matches Square and eBay products by SKU and keeps stock in step both ways. A counter sale lowers eBay’s count, and an eBay sale lowers Square’s. You pick which Square locations sync. The same account can also connect Shopify, Etsy, TikTok Shop and more, so one count covers every place you sell.
- Price: Lite $19/mo for up to 1,000 synced variants. Pro $29/mo for 2,500, adding product and supported order sync. Ultra $69/mo for 10,000, adding price rules and currency conversion, which lets you set a different eBay price. Ultra+ $99/mo for 20,000. Every plan includes two shops, and each extra shop costs the plan rate. Orders are unlimited.
- Rating: 5.0 from 78 reviews. 14-day free trial, no card needed.
- Orders: on Pro and above, eligible eBay orders can create a copy in Square for fulfillment. The original stays on eBay.
- Watch for: Square has no tracking number field, so tracking returns to the eBay order rather than Square. A refund alone doesn’t restock an item. Keep SKUs to 50 characters or fewer, eBay’s limit.
2. Trunk
Trunk is built around one job: real-time, SKU-based stock syncing between Square and your other channels, with unlimited channels and listings on every plan. It’s tied with QuickSync for the top rating on Square’s marketplace.
- Price: Essential $35/mo for up to 100 orders, $45 for 101 to 200, $59 for 201 to 400 and $89 for 401 to 800. Pro, which adds bundles, kits and duplicate SKU syncing, runs from $39 to $119 over the same bands.
- Rating: 5.0 from 90 reviews. 14-day free trial.
- Watch for: counter sales count as orders, so a busy shop moves up bands quickly. Trunk says shops that only need part of their stock synced, like a coffee shop selling merchandise, can ask for fairer pricing. Its Square listing describes stock syncing, low-stock alerts and bundling, not order import.
3. LitCommerce
LitCommerce is a multichannel listing tool. It takes your Square catalog to more than 20 marketplaces, including eBay, Amazon, Etsy, TikTok Shop, Walmart and Temu. Its Square eBay page says Square price, stock and title changes update your eBay listings, and eBay orders come into your Square dashboard.
- Price: from $29/mo, covering 1,000 listings across 3 channels, with unlimited order sync. Larger catalogs and more channels cost more.
- Rating: 4.9 from 34 reviews. 7-day free trial.
- Watch for: the 15-minute sync cycle is the longest published interval among these apps, which matters for one-off items. LitCommerce describes changes flowing from Square to eBay; check how eBay-side edits are handled before you rely on them.
4. M2E Multichannel Connect
M2E connects Square to eBay, Amazon, Walmart US, Temu and TikTok Shop, syncing listings and inventory from Square and collecting marketplace orders in one place. Its pricing suits a shop testing eBay: the first $1,000 of monthly order sales is free.
- Price: free up to $1,000 a month in order sales and 1,000 listings. $19/mo up to $5,000, $39 up to $10,000 and $79 up to $20,000, plus $6 for each extra $1,000.
- Rating: 3.0 from 2 reviews. 30-day free trial.
- Watch for: very few reviews, and the Square listing was last updated in March 2025. Ask whether Square sales count toward the sales bands.
5. Finale Inventory
Finale is a full inventory management system rather than a sync app. It connects Square POS with marketplaces such as eBay and Amazon to prevent overselling, and it can track stock as one shared pool or keep separate counts for your online and in-store locations.
- Price: listed at $99 to $649 a month on Square’s marketplace, with a quote required. Plans are month to month.
- Rating: 4.9 from 15 reviews. 14-day free trial.
- Watch for: it’s more system than most counter-and-eBay shops need, and the cost reflects that.
Two other names come up in searches. Nembol is a crosslisting tool that lists eBay and Square among its channels, though it isn’t on Square’s marketplace. SKU IQ is a well-reviewed Square sync app (4.7 from 140 reviews), but its listing names Shopify, WooCommerce, BigCommerce and Wix, not eBay.
Things to Set Up Before Syncing Square With eBay
- Give every item a SKU, and use the same one on both sides. Sync apps match products by SKU. eBay allows up to 50 characters, so keep codes short. Our guide to what a SKU is shows how to set them up.
- Decide which Square location feeds eBay. If you have more than one shop, pick the location whose stock eBay should sell from.
- Install the app from the Square App Marketplace and connect your eBay seller account.
- Choose where eBay orders are fulfilled. Either keep handling them in eBay, or, on apps that support it, copy them into Square.
- Test one sale each way. Sell one item at the counter and check that eBay drops, then the other way round.
Which Square eBay Integration Should You Choose?
- Busy counter, eBay on the side: QuickSync, from $19/mo with unlimited orders.
- eBay plus Shopify, Etsy or TikTok Shop: QuickSync, so one count covers every shop.
- Under 100 orders a month and stock is all you need: Trunk, from $35/mo.
- Listing on many marketplaces: LitCommerce, from $29/mo.
- Testing eBay with small sales: M2E, free under $1,000 a month.
- Warehouses, purchasing and reorders: Finale Inventory, from $99/mo.
Whichever you pick, start the trial in a normal trading week, so you can see counter sales and eBay sales reach each other. For the Square side of your costs, see our Square fees guide. If you sell on Etsy too, compare the best Square Etsy integration apps.
FAQs
More guides: Square inventory management, Square for Retail review, the best Shopify eBay integration apps, the best WooCommerce eBay integration plugins, eBay SEO, and our Square and eBay integration pages.
