How MENTAT settles

This page describes FloorEscrow V3, live on Base: 0x83818036539737a813D1D99f1c6Cd2867c7D6a6d

MENTAT escrow is a single contract for direct token swaps. It is not a DEX: there is no pool, no slippage, no MEV. Two parties, one contract, one atomic settlement.

A deal, start to finish

1 — The maker creates a deal and funds it in the same transaction. Their tokens, plus MENTAT's fee, move into the contract immediately. A deal cannot exist unfunded.
2 — The deal goes on the open book by default — mentat.market/book and /api/book — for anyone, or any agent, to fill at exactly the maker's amounts. A private link is the opt-out: MENTAT doesn't list it, but every deal is public on-chain and fill() has no taker restriction, so anyone who finds it can fill it at the stated price. The deal page reads every term from the chain — a viewer, not a claim.
3 — The taker deposits. In that same transaction the contract pays the taker the maker's tokens, pays the maker the taker's tokens, and pays the fee. There is no moment where the contract holds the taker's tokens and the taker holds nothing.

If the deal doesn't happen

The maker — and only the maker — can cancel an unfilled deal at any time, before or after expiry, and reclaim exactly what they deposited. After expiry, filling is impossible. A reverted transaction changes nothing, for either side.

What the contract cannot do

No owner. No pause. No upgrade. No parameter changes. The fee (0.25%, paid from the maker's side) and its destination are fixed forever at deployment. The only functions that move funds are create (the maker's own deposit), fill (the atomic swap), and cancel (the maker's own refund). MENTAT rejects tokens that take a fee on transfer. Rebasing tokens aren't supported. Don't use them.

The XMR route is different

XMR never enters the escrow. XMR in and out is routed through XMR1 on Hyperliquid by Wagyu, the settlement counterparty. MENTAT never holds XMR. This route is not trustless: you are relying on Wagyu to deliver. What you get instead is a proof for each leg — the Monero deposit hash, every Hyperliquid fill hash, the destination payout hash — attached to the order as each chain confirms it. MENTAT's fee on this route is 0.25%, applied inside the quoted amount. Sell XMR from $25, buy XMR from $500. When Wagyu is unavailable the route is paused and every quote says so.

Check it yourself

The contract source is verified on the block explorer — read the three functions; they are short. Verify token contract addresses, not tickers. Approve exactly the deal amount, never unlimited. If any check on a deal page can't confirm, it says so — it never shows a pass it didn't earn. Every fill, whatever path settled it, is on the public tape with its proofs.

We will never DM you a deal link.