Arcus vs Uniswap on Robinhood Chain: Which to Route To

Two very different bets on how routing should work

Arcus and Uniswap went live on Robinhood Chain the same day, and any bot trading stock tokens now has to decide, per fill, which pool to hit. That decision isn't cosmetic. Fee structure, contract design, and liquidity concentration diverge enough between the two venues that naive routing — always Uniswap, or always whichever pool shows better top-of-book — will leave money on the table in one direction or the other.

The fee delta is real, but it's not the whole story

Arcus launched zero-fee spot trading across roughly 95 stock tokens. Uniswap on Robinhood Chain runs its usual fee-tiered pool model, the same 0.01% / 0.05% / 0.3% / 1% tiers you'd see on Arbitrum One, chosen per pool at deployment. For a market-making or arbitrage bot doing dozens or hundreds of round trips a day, a flat zero-fee venue is an obvious pull: it removes one whole term from the profitability equation and lets a bot capture spreads a fee would otherwise eat.

But fee is only one input. Fill price is fee plus slippage against the pool curve, and on Uniswap it also depends on which fee tier actually has depth for that token. A zero-fee venue with a thin pool can execute worse than a fee-charging venue with a deep one, because slippage on a small pool scales faster than a flat basis-point fee does. Nobody has real depth numbers ten days into this chain's life, so treating "zero fee" as synonymous with "best execution" is a mistake a bot will make exactly once before it gets picked off by whoever is watching both venues.

Contract-level differences change how you build the router

Arcus, incubated by dYdX Labs, is not a Uniswap v3/v4 fork under the hood — expect its own AMM or hybrid orderbook-AMM design rather than concentrated-liquidity math. That means your router can't reuse a single quote function across both venues. You need two separate quote paths: Uniswap's quoteExactInputSingle (or the v4 quoter) against known pool addresses and fee tiers, and Arcus's own quoting interface, whatever it turns out to expose once its ABI settles. If you've built routers spanning Uniswap and a dYdX-style venue on other chains, the plumbing is familiar; if you haven't, budget real engineering time for it rather than assuming you can copy an ABI across.

A minimal two-venue quote comparison in viem, structured so you can drop in real pool and router addresses once you've confirmed them on-chain:

import { createPublicClient, http } from "viem";

const client = createPublicClient({
  chain: robinhoodChain, // custom chain config, Arbitrum-stack params
  transport: http(RPC_URL),
});

async function getBestQuote(
  tokenIn: `0x${string}`,
  tokenOut: `0x${string}`,
  amountIn: bigint
) {
  const [uniswapQuote, arcusQuote] = await Promise.all([
    client.readContract({
      address: UNISWAP_QUOTER,
      abi: quoterAbi,
      functionName: "quoteExactInputSingle",
      args: [{ tokenIn, tokenOut, amountIn, fee: 500, sqrtPriceLimitX96: 0n }],
    }),
    client.readContract({
      address: ARCUS_QUOTER,
      abi: arcusQuoterAbi,
      functionName: "getAmountOut",
      args: [tokenIn, tokenOut, amountIn],
    }),
  ]);

  return uniswapQuote > arcusQuote
    ? { venue: "uniswap", out: uniswapQuote }
    : { venue: "arcus", out: arcusQuote };
}

That's the skeleton, not the finished router. A production version adds per-venue gas estimation (call gas differs between a concentrated-liquidity swap and whatever Arcus's contract does), a staleness check on both quotes, and — since Robinhood Chain settles to Ethereum with roughly 100ms block times — a decision on how much latency you're willing to burn querying two venues versus acting on the first quote that clears your threshold. Continuously-quoting bots feel this tradeoff hardest; it's the core design problem behind our Robinhood Chain market-making service.

Where each venue actually fits

Uniswap's advantage on Robinhood Chain isn't the fee, it's the tooling. The Uniswap API explicitly supports wiring Robinhood Chain trading into external apps and bots, which means SDK support, existing indexers, and a quoting interface already battle-tested across every other Uniswap deployment. If you're building infrastructure that also touches other EVM chains — the same bot arbitraging Ethereum, Arbitrum, and Robinhood Chain — routing through Uniswap where possible keeps the integration surface smaller. That's the same principle behind our piece on CEX vs DEX arbitrage bot design.

Arcus's advantage is the fee line, and potentially tighter spreads on the specific stock tokens it lists, since it was built for this asset class rather than adapted to it. A dYdX-incubated team designing a stock-token venue from scratch has presumably thought about after-hours gap risk and cross-venue arb in a way a generic AMM deployment hasn't. Whether that translates into better realized execution once real flow shows up is genuinely unknown; it's a claim to test with small size, not assume. Its contracts are also new and comparatively unproven, which matters more the larger the size you route through them — worth a smart contract audit of anything you build on top of it before committing real capital.

	Arcus	Uniswap
Fee model	Zero-fee spot	Tiered (0.01%–1%), pool-dependent
AMM design	Own model (dYdX-incubated), likely non-CL	Concentrated liquidity (v3/v4 math)
Asset coverage	~95 stock tokens at launch	Depends on deployed pools, broader over time
Tooling / SDK maturity	New, unproven	Mature, cross-chain, API-documented
Best fit for	Fee-sensitive high-frequency legs, ArcusBot perp routing	Multi-chain bots, deep-pool assets, composability with existing Uniswap infra
Biggest unknown	Real liquidity depth under load	Pool depth specifically on Robinhood Chain, a fresh deployment

The verdict, with the caveat up front

Neither venue is categorically better ten days in; this genuinely depends on the token and the size of your clip. For small-to-mid size trades on the roughly 95 tokens Arcus lists, quote both and default to Arcus when its post-slippage price beats Uniswap's post-fee price, which on a zero-fee venue with comparable depth it usually will. For anything outside Arcus's coverage, for large clips that need splitting across multiple pools, or for a bot that already routes through Uniswap on other chains, keep Uniswap as the default and treat Arcus as an opportunistic add-on.

Don't hardcode a preference either way. Build the dual-quote comparison from day one, log every fill against both venues' theoretical price, and let the data, which doesn't exist yet, tell you the actual split after a few weeks of real order flow. If you're still deciding whether Robinhood Chain is the right venue at all versus other tokenized-equity platforms, our comparison of Robinhood Chain against other tokenized RWA venues covers that tradeoff, and our cost breakdown for building a Robinhood Chain trading bot in 2026 is a reasonable starting budget once you've decided to build.

We build the routing layer, the quote comparison, and the execution logic for teams trading across Arcus, Uniswap, and whatever launches next on Robinhood Chain. See our Robinhood Chain arbitrage bot development service for what that looks like in practice.