Liquidity that
re-centres itself.

Concentrated liquidity earns fees only while price sits inside the range you chose. The moment price leaves it, the position stops earning and becomes a single idle token. On Robinhood Chain this bites harder than anywhere: stock tokens track a feed that moves 24/5, while the exchange floor most people watch is open about 6.5 hours a day. Your range breaks in the hours you are asleep, and stays broken until you happen to open an app.

The fix a professional market-maker uses is to re-centre the range around the new price. Doing that by hand, at 3am, on every position, is not a strategy — it is a night shift. Vincera is that night shift, run by a contract you cannot be locked out of.

When a position drifts past a trigger you set, Vincera performs one atomic transaction: it collects the accrued fees, burns the out-of-range position, and re-mints a fresh range around the current price. Either the whole cycle succeeds or it reverts and nothing changed — there is no state in which your liquidity is left half-moved.

The trigger is a threshold in ticks past the range edge, so a position is not churned on every wobble, only when it has genuinely left the band by the margin you allow.

Neither Uniswap v3 nor v4 can move a range in place: a rebalance must burn one NFT and mint another with a brand-new tokenId. That is not an implementation detail — it is observable on the live chain, where one cycle produced tokenId 191333 and the next 191334.

So a tokenId is a receipt, not an identity. Vincera issues its own positionId, derived from (owner, count), which survives every re-mint, and every setting you chose hangs off that. Config keyed on tokenId would go stale after exactly one cycle, silently: automation would rediscover the new NFT as an unknown position with no threshold and no authorisation, and simply stop — while you slept believing you were covered.

Single-sided (default). A position that has left its range holds one token. Rather than swap back to straddle price — which realises the divergence loss and pays pool fees — Vincera re-mints a range beside spot using only the token you already hold. Nothing is sold; no paper loss is made permanent. The side is not a choice: price up leaves you in token1, so the only fillable range is below spot, and vice-versa. The contract reads the breach and picks the side, so it cannot pick the one that reverts.

Centered. A range that straddles spot needs both tokens, so it must swap. Offered for users who want to keep earning on both sides immediately — never chosen for them.

Vincera takes 3% of the trading fees a rebalance collects, and nothing else. The basis is what the protocol paid out for a fees-only collect — it is measured, never inferred by subtracting a modelled principal from a total (a model that leans on a manipulable price and dumps all its error into the bucket being charged on). A position that earned nothing is charged nothing, by construction.

The rate is a compile-time constant, not an admin setting: a fee that can be raised later is a fee nobody can reason about. In fork tests against the real CASHCAT/WETH pool the effective take measured 2.98%.

Vincera never holds your funds or your keys. To automate, you authorise a scoped session key in the Authority contract. On-chain, that key can only call rebalance — you whitelist that one selector — the grant is time-boxed (the app sets 30 days) and you revoke it in a single transaction. Any tokens a rebalance touches are swept back to your wallet in the same call; the new NFT is always minted to you, never to the keeper.

The Rebalancer has no owner and no admin function. Nobody, including us, can point it at a different treasury, pause it, upgrade it, or reach a user’s funds. Pools with hooks are refused by default — a hook can move price between the burn and the mint, inside our own transaction, and no gas strategy defends against that.

• VinceraAuthority — session-key grants, selector whitelist, expiry and a first-grant cooldown. The single gate for “may this key act for this user on this position?”
• VinceraRebalancer — the ownerless engine. Holds each position’s durable config, enforces the threshold and slippage bound, drives collect → burn → re-mint, and takes the fee.
• Adapters (v3, v4) — one interface, two Uniswap versions. The engine speaks IVinceraAdapter; each adapter maps it onto that version’s position manager. The deepest pools are covered whichever version they live in.
• VinceraTreasury — the only destination the 3% can reach.
• Keeper — an off-chain monitor that calls needsRebalance and, when true, fires rebalance with the session key. It runs live, 24/7. Off-chain by necessity (someone must watch the clock), powerless by design (it can only trigger what the contract already permits, and only with a key the user granted).

The contracts are deployed and exercised end-to-end against a fork of Robinhood Chain mainnet, on real Uniswap v3 pools, with two real rebalances:

• · Owner path — position re-centred, tokenId 202681 → 202683.
• · Session-key path — rebalanced by the keeper, with no owner signature, 202682 → 202684; the new NFT still minted to the owner.
• · Fee measured on collected fees only; config carried atomically across the re-mint.

61 unit and fork tests pass across the Authority, RangeMath, adapter and Rebalancer. One engine drives both Uniswap v3 and v4 through a single adapter interface; the contracts are live on Robinhood Chain mainnet, and the keeper runs continuously against them.

Vincera is pre-audit software. Providing liquidity carries impermanent loss and smart-contract risk. A rebalance realises the current state of a position and cannot guarantee returns; single-sided re-mints avoid realising a loss but do not erase divergence. A third-party audit is required before it handles significant funds. Use at your own risk.