A Uniswap v4 hook contract whose address declares 5 callbacks, first read initialising a pool at block 21,249,942. HEY attributes it to Miko Fee Hook: HEY’s review confirmed it as the project’s; it is not proven on chain.

What it is

Uniswap v4 hook

Callbacks its address declares

beforeInitialize, beforeSwap, afterSwap, beforeSwapReturnDelta, afterSwapReturnDelta. What the PoolManager will call, not what the hook does.

First pool HEY read

Block 21,249,942

Attributed to

Miko Fee Hook: HEY’s review confirmed it as the project’s; it is not proven on chain

How it is tied

Confirmed by HEY’s review on 2026-10-04. Not proven on chain; HEY’s own reading of the chain would supersede it.

Uniswap’s hooklist

Listed in Uniswap’s hooklist as MikoFeeHook. A third-party listing, shown as context: it does not tie the hook to a project.

The hook’s page

Who built this hook, its pools and what HEY does not know

Where HEY read it

HEY’s review (not proven on chain) · View at the source ↗

When it happened

2026-07-28, dated by the source to the minute

HEY first saw it

2026-10-01 (18d ago)These are two different clocks: when the work happened, as the source dates it, and when HEY first read it.

Counts toward building

No. It is context: it does not change activity status or Build Momentum.

What it does not say

A contract record says what the chain shows about a contract. It is not a safety check, and it does not say who runs the contract.