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The P2P market is where players sell their own CS2 skins to other CSBoard buyers. With an API key you can do the seller’s part from a script: read your inventory, publish items at your price, and reprice or remove them later. It is free. Any valid key works — no balance requirement and no trading permission. P2P listing is CS2 only.

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Before you start

The website’s seller rules apply to the API unchanged:
  • a verified email or a linked Telegram, so we can tell you when an item sells;
  • the CSBoard extension or app running, able to send the Steam trade, and Steam Mobile Authenticator on the account;
  • no P2P cooldown, suspension or shop lock on the account.
If one is missing, the publish call names it — for example 403 contact_required or 400 no_capable_client.

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How it works

1

Read your inventory

Each row is one copy of an item. Rows with listable: true can be published now; the others say why not in reasons. If inventory_proof.status is pending, we have just started reading your Steam inventory — call again after retry_after_ms.
2

Publish at your price

Send operational_asset_id and asset_revision from the inventory unchanged, and price_usd in whole cents. Send up to 50 items at once as { "items": [...] }. Idempotency-Key is required: if the connection drops, resend the same request with the same key and nothing is listed twice.
3

Manage your listings

GET /v1/p2p/listings shows what is on sale and what is mid-sale, with seller_payout_usd for each. Change a price with PATCH /v1/p2p/listings/{id} or take a listing down with DELETE /v1/p2p/listings/{id} while it is still active.
4

Send the item when it sells

When a buyer pays, the listing moves to trade_pending and we notify you by email or Telegram. The item still has to leave your Steam inventory: your CSBoard extension or app prepares the trade offer to the buyer, and you confirm it with Steam Guard in the Steam mobile app. Do it promptly — sales left unanswered lock your shop (shop_locked).
5

Get paid

Once the buyer accepts the trade, the listing sits in verification_hold while Steam’s trade protection runs. When it ends and the trade still stands, seller_payout_usd is credited to your CSBoard balance.

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Pricing rules

  • Prices are in USD, from 0.10 to 100000, in whole cents. 12.345 is refused, not rounded.
  • A price under half of our market price for the item is refused with 422 price_below_market. The body carries market_usd and floor_usd, so your script can correct itself. On the website a seller can confirm a lower price after a warning; over an API key there is no such confirmation, so a leaked key cannot be used to dump your inventory.
  • Our commission is shown on every listing as commission_usd; seller_payout_usd is what you receive.

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Limits

Publishing, repricing and removing share one limit: 30 requests per minute per key. A batch of 50 items is one request. Reads follow your key’s normal per-minute limit. See Rate Limits.
A listing only stays on sale while the item is in your inventory. If a full inventory read no longer finds it, the listing is taken down and shows needs_resync: true. Publish it again once the item is back.