dYdX alternatives

dYdX v4 is a Cosmos-based decentralized perpetuals exchange that runs an on-chain orderbook on its own appchain, with a published tier-0 taker fee of 5 basis points and one of the tightest non-zero-fee books outside Hyperliquid. Published fee schedules are only half the story for a trader picking a venue, because the rack rate ignores the spread crossed at market and the price impact eaten at notional. This benchmark measures the live all-in cost of opening a $1000 ETH long 10x position across major perpetual venues, every five minutes, by reading taker fees from each venue's own API (no hardcoded schedules) and walking each orderbook for $1000 of buy-side notional to compute the spread plus impact component. No transactions are sent. dYdX is queried via its indexer at `/orderbooks/perpetualMarket/ETH-USD` and `/perpetualMarkets`, plus the Cosmos REST endpoint `/dydxprotocol/v4/feetiers/perpetual_fee_params` for the tier-0 default fee. The same harness reads Hyperliquid via `userFees` and `l2Book`, GMX v2 through the synthetics-arbitrum subgraph for `positionFeeFactor`, Lighter via `/orderBookDetails` and `/orderBookOrders`, and gains.trade on Base by reading the fee directly on-chain. All-in cost equals taker fee plus spread, both surfaced as separate metrics. Funding rate is recorded separately (`perp_fees_funding_rate_per_hour_bps`) because it accrues per hour held rather than at open, so bundling it into a single one-number leaderboard would conflate two different fee mechanics. The dimension tab at the top of the page swaps the underlying asset between ETH, BTC and SOL.