ACEOs/ATCs: Artist Trading Cards

What are ACEOs (or ATCs)? Essentially, they're trading cards made by artists—miniature original artworks created at a fixed size of 2.5 × 3.5 inches (64 × 89mm), the same dimensions as standard trading cards.

A brief history

The format originated in Zürich in 1997 when artist M. Vänçi Stirnemann organised the first trading session, inviting artists to create and swap pocket-sized works. The idea spread through mail art networks and eventually online communities, particularly flourishing on platforms like eBay in the early 2000s.

The distinction between the two terms is simple: ATCs (Artist Trading Cards) are made exclusively for trading—never sold. ACEOs (Art Cards, Editions and Originals) follow the same size format but can be bought and sold commercially. The name ACEO emerged specifically to differentiate sellable cards from the trade-only tradition.

Why the format works

The fixed dimensions create an interesting constraint. Artists must work within a space roughly the size of a playing card, which demands economy and intention. There's no room for filler. Every mark matters.

For collectors, ACEOs offer an accessible entry point into original art. A hand-painted watercolour or ink drawing becomes attainable at a fraction of what larger works command. They're easy to display, store, and post—making them ideal for online sales.

For artists, the format allows experimentation without the pressure of larger pieces. A failed ACEO represents minimal material loss. A successful one can be produced relatively quickly, making it viable to offer original work at lower price points while still valuing your time appropriately.

Common mediums

Artists work in virtually every medium at this scale: watercolour, gouache, coloured pencil, ink, acrylic, collage, digital prints, and mixed media. Some create one-off originals; others produce small editions of prints, signing and numbering each card.