How this is measured
Straight from the chain
Every number here is counted from the Uniswap V3 factory's own
PoolCreated logs and the pools' Swap logs.
There is no indexer and no screener API in the path, so this is the
whole population rather than the subset some vendor chose to list.
"Alive" means someone traded it
Not that it still holds liquidity. On this chain the launchpads lock LP automatically, so liquidity long outlives the coin — measuring it that way reported 76% of day-old launches as alive, which is plainly false. A market is people trading.
Why "up from launch" is a bad metric
A V3 memecoin launches single-sided above spot, so its price cannot fall below where it started until somebody sells back through it. Nearly every pool that ever traded is nominally up — 98.9% of them. That number measures one buy, not success.
The number this page nearly shipped
An earlier version read the half-life off "has it traded in the last N minutes, by age". That figure tracked N, not the coins: at N = 10 min it reported a 10-minute half-life, at N = 30 min it reported 32. Any age band shorter than the window collapses into "did it ever trade", so the cliff sat wherever the threshold was put. The fix was to stop using a threshold — measure each pool's last trade directly. The honest answer is —, not half an hour.
Seconds are not precise here
Blocks arrive faster than the clock they carry — runs of consecutive blocks share a single timestamp. Times are interpolated between real block timestamps, which is accurate over minutes and meaningless below a few seconds. Read the very short lifespans as "immediately", not as a stopwatch reading.
The denominator shrinks
The cohort spans a range of ages, so a coin launched three hours before the scan cannot be observed surviving six. Each point on the curve divides by the pools old enough to be eligible at that age, not by the whole cohort — counting the rest would score them with deaths they never had the chance to avoid.
What this still can't see
Wallets are addresses, not people: one person can deploy from many, so the serial-launcher table is a floor. Launchpads are identified by the contract a transaction called, which misses any pad that routes through another. And a coin that stops trading could in principle come back — none of this predicts anything.