The first token ever launched into a hook pool on Solana

On Ethereum, Uniswap v4 introduced hooks in 2025 — the idea that a liquidity pool could call out to a separate program at fixed moments in its life, and let that program change what happens. A pool stopped being a fixed machine and became something you could extend.

Solana had nothing like it. Raydium, Orca, Lifinity, Meteora — every major venue going back to 2021 was a closed box. You could list a token on them. You could not teach them anything. A survey of 43 Solana AMM and DEX programs finds not one with a pool-level hook before May 2025.

Saros deploys a bin-based market maker with a field on every pool account called hook — an optional pointer to another program — and a matching interface with the full Uniswap v4 callback surface:

before_swap    after_swap        when someone trades
before_mint    after_mint        when liquidity is added
before_burn    after_burn        when liquidity is removed

This is the v4 pattern, arriving on Solana. The pool holds the hook's address; the AMM stops partway through a trade and calls it. A day later the first hook implementation goes live — a rewarder, built to pay liquidity providers.

Then, for seven weeks, nobody uses it.

Wallet HM9XRfj4… opens a JUP/wSOL market and attaches a hook to it. It is the first pool on Solana ever to carry one.

The hook pays liquidity providers in JUP itself, and the band is severe — only liquidity sitting within two bins of the live price earns anything at all.

A different operator opens PENGU/USDC with a far more generous setup — rewards in USDC, spread across a thirty-one bin band so liquidity keeps earning as the price drifts. This is the pool that puts hooks to work: 484 swaps, each one stopping to call the hook.

Seven more follow through the autumn: SAROS, USDG, PayPal USD, USDT, USD1. Real venues, real volume. Across all twelve hooked pools, 7,053 swaps — and 6,947 of them call their hook.

But every one of these is the same shape. A token that already existed, given a smarter market afterwards. The hook is something that happened to them.

Saros is a bin market: liquidity sits in discrete price steps, and exactly one bin is active at the current price. Each hooked pool gets its own rewarder instance, holding five numbers:

reward_token_mint      what it pays out
hook_reserve           where the rewards are held
rewards_per_second     the drip rate
delta_bin_a .. delta_bin_b   how far from the price you can sit
end_time               when it stops

At 07:01:01 UTC, HM9XRfj4… — the same wallet that opened the first hooked pool in July — runs InitializeMint and creates a token that has never existed before.

Twenty-two minutes later, it opens that token a hooked pool.

No listing. No prior market. No history to retrofit. The token and its hooked market are a single act — the first time on Solana a token was created for a hook rather than fitted with one.

And it is configured like nothing before it. The pool pays rewards in the token itself, and the earning band collapses to a single bin. Not two either side, like JUP. Not fifteen, like PENGU. One. Sit exactly on the price, or earn nothing.

The reward reserve was funded to the second:

pool created    2025-10-13
emissions end   2026-02-06        116 days
116 days x 1000 units/sec    =    10.0136 tokens
reserve funded with          =    10 tokens

Ten tokens, released at a millionth of a token per second, payable only to liquidity standing exactly on the price. The window ran one hundred and sixteen days and closed.

Not one was ever claimed. To earn them you had to provide liquidity in a single bin of a market nobody was trading — and nobody ever was. The pool recorded zero swaps for nine and a half months. The reserve still holds all ten, stranded behind a schedule that expired in February.

Nine and a half months after it opened, the pool processed its first swap. This is what the chain recorded — the market stopping mid-trade to call the hook, and the tokens moving only once it returned:

1qbkdrr3z4ryLA7pZykqxvxWPoeifcVKo6ZG9CfkvVE invoke [1]   ← the market
  Instruction: Swap
  mdmavMvJpF4ZcLJNg6VSjuKVMiBo5uKwERTg1ZB9yUH invoke [2]   ← the hook fires
    Instruction: BeforeSwap
  TokenkegQfeZyiNwAJbNbGKPFXCWuBvf9Ss623VQ5DA invoke [2]
    Instruction: TransferChecked                           ← tokens move after

Not a token extension. Not a wrapper. A market calling a separate program at a named point in the life of a trade — the thing Solana could not do before May 2025, running on the first token ever born into it.