OpenOcean on herrenlos: another same-chain EVM aggregator in the fan-in

herrenlos quotes several route providers at once and points you at the best executable one (how swaps work here). OpenOcean is one of those providers — a DEX aggregator that competes on same-chain EVM swaps, in the same lane as 0x. This post is what OpenOcean is, where it fits, and — just as usefully — when it doesn't appear.

What OpenOcean is

OpenOcean is a DEX aggregation layer: for a swap between two tokens, it searches across the on-chain decentralized exchanges on a chain, splits the trade where that gets a better price, and returns a single route plus the calldata to settle it. It's the same core idea as the other aggregators in the set — take one job (best on-chain price) and do it well — sourced from a different set of venues and split logic, which is exactly why quoting it alongside the others is worth doing.

Its role in herrenlos's provider set

herrenlos runs a set of providers so no single one has to cover everything, and so same-chain EVM trades get more than one independent price. OpenOcean's lane is same-chain swaps within the EVM — two tokens on Ethereum, or on Arbitrum, Base, BNB Chain, Polygon, Optimism, Linea, or Sei.

When you enter a same-chain EVM pair, herrenlos asks OpenOcean for a quote in parallel with 0x, LI.FI, and the rest, then ranks everything by what you'd actually receive after the route's costs — never by who pays us. If OpenOcean returns the best executable price, it's highlighted; if a sibling aggregator wins for that pair and size, that one is. It's one competing line, not the app and not an exclusive partner.

When it appears — and when it doesn't

OpenOcean is deliberately scoped, so it's honest to say where it's silent:

• Same-chain EVM → it competes. Both sides on the same EVM chain herrenlos supports.
• Cross-chain → it doesn't. OpenOcean here is a same-chain aggregator, not a bridge. Moving between chains is covered by providers built for it — Chainflip, LI.FI, Squid.
• Bitcoin (or any deposit-address L1) source → it doesn't. Those aren't signed in-page and aren't OpenOcean's lane; SwapKit and the deposit-address exchanges reach them instead.
• Solana → it doesn't, in this app. herrenlos does not route Solana through OpenOcean; SPL swaps come from other providers. So don't expect an OpenOcean card on a Solana pair — its absence there is by design, not an outage.

If you don't see OpenOcean on a given trade, that's usually one of the above — a route it doesn't serve, never a route we hid.

Non-custodial, the whole way

You sign in your own wallet, in-page — herrenlos never holds your funds, and there's no account or KYC. A same-chain EVM swap is a token approval and a swap transaction, both signed by you; if it can't complete it simply reverts on-chain and costs only gas.

Your keys never leave your wallet. Non-custodial isn't a mode you switch on — it's the only mode.

Honest about the limits

• Same-chain EVM only. Not a bridge, not a Solana or Bitcoin router — it competes where both sides sit on the same EVM chain.
• Liquidity and impact vary by pair and size. Aggregating DEXes gets a good price for well-traded pairs; a thin token or an outsized trade can still carry real price impact. herrenlos shows the impact estimate on the route so you can judge it — the quote panel is the source of truth for any specific trade.
• A quote is a snapshot. Prices move; the amount shown is an estimate until the swap executes.
• It's one provider among several. When OpenOcean isn't the best route — or can't route a pair — another aggregator often can, and herrenlos is honest when none can.

Try it

Open the swap page, pick a same-chain EVM pair, and watch OpenOcean ranked against 0x, LI.FI and the others by what you'd actually receive. The swaps post explains the parallel routing in full, and the roadmap tracks what's shipped and next across providers.