Papertrade draws $3B in Bitcoin open interest as on-chain perps exchange launches

Papertrade, a fully on-chain perpetual futures exchange built on HyperEVM, went live on October 10, 2026. Bitcoin futures open interest on the platform climbed to $3 billion shortly after launch.

A fast start, measured in notional dollars

Trading opened at 10 a.m. ET, or 14:00 UTC. In under 10 minutes, the exchange had recorded $14.4 billion in notional trading volume.

Ether futures open interest reached $2.66 billion, trailing Bitcoin’s $3 billion. Activity was concentrated almost entirely in those two markets.

Open interest is the total value of positions still open at a given moment. Volume counts every trade, including positions opened and closed seconds later. Both figures are notional, meaning they reflect the full size of leveraged bets rather than the cash traders actually posted.

That distinction matters a lot here. Papertrade offers leverage of up to 1,000x on its synthetic perpetual contracts.

At 1,000x, a trader can control $1,000 of exposure with $1 of margin. So billions in notional activity can rest on a far smaller pool of real deposits.

Before launch, the exchange collected pre-deposits estimated at approximately $85 million to $138 million. That money came from more than 11,000 addresses.

How the machine is built

Papertrade does not use a traditional orderbook. Positions open and close atomically, in a single step, rather than being matched against resting orders from other traders.

Prices are pulled from the midpoint of Hyperliquid’s best bid and offer. The design aims to avoid slippage and conventional trading fees.

To handle expected launch-day congestion, initial trades were routed through Papertrade’s own frontend. Whitelisted relayers supported that flow.

Risk limits are built in. Each market side carries $1 billion in open-interest headroom, and individual positions are capped at $10 million in atomic size.

The house starts with nothing

The most unusual feature sits on the other side of every trade. Papertrade’s house liquidity pool began empty.

That pool is meant to grow as traders lose money. Losing positions feed the house, and the house pays out winners.

The model therefore leans on trader losses or delayed settlement to fund payouts. Combined trader balances and house liquidity are not all available to pay winning trades.

The exchange also carries a profit haircut, or asymmetric profit-and-loss fee, inherited from earlier trading models. In plain terms, winners may not walk away with their full gross gain.

A token minted from losses

Papertrade’s native token, PAPER, launched with no initial supply. It comes into existence only when traders realize losses.

While the liquidity pool holds less than $2 million, the protocol mints 100 PAPER for every $1 lost. That rate declines as the pool grows.

Transfers are restricted. Initially, PAPER can only be moved for staking.

What this means for traders and rival venues

Papertrade runs on HyperEVM and prices off Hyperliquid, so it is effectively layering a new risk model on top of an existing market’s price discovery. Pricing is only as reliable as the reference market, and any disruption on Hyperliquid’s side could flow straight into Papertrade’s contracts.

The house liquidity pool starts at zero and is fine when traders lose on aggregate. A sharp, one-directional move in Bitcoin or Ether could flip that, with payouts depending on delayed settlement and the haircut mechanics.