Guides
How listing on eBay from AliExpress actually works, and what to do when it does not: the fields eBay insists on, the costs that decide a margin, and the errors that stop a listing going live. Written for people doing it, not for people selling courses about it.
Fixing an error
The message you are looking at, what it means, and what to do about it.
eBay error 25001: a system error has occurred
A system error has occurred
What eBay error 25001 means when an offer or inventory item will not publish, why it is usually temporary, and what to do when it is not.
4 min read
eBay says your value is not valid for that item specific
is not a valid value for the item specific
Why eBay rejects a size or colour that plainly exists, how Size Type and Department decide what is allowed, and how to find the values eBay will accept.
5 min read
eBay says your variations are invalid
Invalid multi-variation listing
The four things that make eBay refuse a multi-variation listing — duplicate option names, unknown values, missing prices, photo rules — and how to find which.
5 min read
AliExpress says delivery is not available to your address
DELIVERY_NOT_AVAILABLE_TO_YOUR_ADDRESS
Why AliExpress refuses a delivery quote for a product its own page delivers, how per-variation stock causes it, and what to check before giving up on it.
5 min read
AliExpress DELIVERY_SERVICE_EXCEPTION
DELIVERY_SERVICE_EXCEPTION
Why AliExpress answers a delivery request with a service exception, why it is usually about the request rather than the product, and how to get a quote anyway.
4 min read
AliExpress: api access frequency exceeds the limit
Api access frequency exceeds the limit
Why AliExpress bans an application for a few seconds, why the limit is shared across all of a tool’s users, and how to stop tripping it.
4 min read
eBay says your picture is too small
picture is too small
Why eBay refuses images under 500 pixels on the longest side, why supplier description images so often fail it, and what to do instead of dropping them.
4 min read
eBay cannot read a WebP image
Mime type image/webp does not support decoding
Why eBay refuses WebP images, why AliExpress serves them by default, and the simplest way to get a format eBay accepts.
3 min read
eBay cannot find your business policies
business policy not found
Why eBay reports no business policies when your account plainly has them, what opting in changes, and the inventory location that fails publishing separately.
4 min read
eBay says your production keyset is disabled
Your keyset is currently disabled
Why eBay issues production keys and then disables them, what the marketplace account deletion endpoint has to do, and why a test notification can fail with 412.
5 min read
Guides
How the parts fit together, for when there is no error yet.
eBay item specifics for clothing and shoes
Which item specifics eBay requires on clothing and shoes, why Size Type and Department decide which sizes are allowed, and how to fill them quickly.
7 min read
How to import an AliExpress product to eBay
What has to move from an AliExpress page to an eBay listing — photos, description, variations, item specifics — and what goes wrong doing it by hand.
8 min read
eBay variation listings for size and colour
How multi-variation listings work on eBay, why they beat separate listings, and the rules on option names, values and photos that decide if yours publishes.
6 min read
AliExpress delivery costs and your eBay profit
Why an AliExpress delivery quote differs from the page, how free delivery thresholds work, and why the cost must be in your price before you list.
6 min read
eBay fees and what is actually left
The arithmetic behind an eBay sale — final value fee, fixed fee, product cost, delivery and ad rate — and why margins look healthy until you include all five.
7 min read
Finding products worth listing on eBay
What separates a product that sells from one that sits: proven demand, margin that survives fees, and competition you can read before you commit.
8 min read
Keeping eBay prices and stock in step
What happens when a supplier raises a price or runs out, why manual checking does not scale, and what a sync should and should not change on its own.
6 min read
eBay business policies, and why publishing fails without them
Payment, postage and returns policies explained, how to opt in, why a listing needs a location to send from, and what each one should say.
6 min read
eBay photo requirements
The 500 pixel minimum, how many photos a listing takes, what eBay does not allow on an image, and why supplier photos so often fail.
5 min read
eBay Promoted Listings and choosing an ad rate
How Promoted Listings General charges, how to pick a rate your margin can carry, and why the profit you should be looking at is the one after the ad.
6 min read