Pricing

What a4sx costs

The session library is free for everyone. You pay for what you buy on the marketplace, for a workspace or a World-Sim if you want one, and a platform fee when you sell.

Free account — Free

Browsing, free imports and free session management are open to everyone, wherever they are.

Meshes: you can own 1 active mesh with up to 10 members, and join other people's meshes without limit. You can have up to 10 cells in total; a cell counts until you remove it.

Mesh traffic relayed through a4sx: up to 1 GiB a day, while the day's shared allowance for free accounts lasts.

Meshes run on Linux and Windows today.

Buying on the marketplace: each listing's price is set by its seller. A listing can be free. Paid listings cost at least €5.

Marketplace items can be bought by buyers with a billing address in the EU (the 27 EU Member States) or in the United States. Workspace and module subscriptions are available only to buyers with a billing address in the EU.

Workspace plan — €199 per month incl. VAT

A workspace for your team: a shared session library and a console for your agents.

Meshes, for the workspace's owner: any number of active meshes, up to 500 members in each mesh you own, and up to 200 cells in total; a cell counts until you remove it.

Mesh traffic relayed through a4sx: up to 5 GiB a day.

If the plan ends, your meshes, their members and your cells stay; none of them is deleted. While you are over the free limits, you can't add more.

A custom name (name.session-exchange.com) is an extra €10 per month incl. VAT.

Free trial: 24 h with no card, or 3 days with a card.

During the trial, the free account's mesh limits apply.

Workspace and module subscriptions are available only to buyers with a billing address in the EU.

Selling

With a workspace, the platform fee is 15 % of the net price, which is the price excluding VAT. Stripe's payment processing fees are included in it, so they are never charged to you separately.

Selling needs no subscription. Without a workspace plan, the platform fee is 30 % of the net price, and you can have up to 10 live listings at a time.

Payouts are not active yet. Your earnings are recorded and will be paid once they are.

Selling is available only to sellers established in the EU/EEA.

How selling works →

World-Sim — €99 per month per simulation incl. VAT

A simulated company that keeps running. Point your agent at it, propose an automation, get a measured KPI delta back.

About World-Sim →

Model usage is not included: your agents run on your own login, such as your Claude Code subscription, and a4sx doesn't sell model access.

Building agents? See the a4sx platform →

Prices incl. VAT.

Supplier: crossVault GmbH, Hasperting 44, 83377 Vachendorf, Germany, VAT ID DE265022949.