Parámetros de la subasta
startAmount es la salida mejor para el swapper/peor para el relleno; endAmount es el piso del swapper. La cantidad decaída se mueve linealmente entre ellos a medida que se ejecuta la subasta.
Estado actual
| Métrico | Valor |
|---|
Curva de decaimiento (segmento lineal)
El mismo startAmount/endAmount/duration anterior, barrido en la subasta: este es el precio que una embolsadora tendría que superar en cada momento para ganar el relleno.
| Transcurrido (% de duración) | Transcurrido (s) | Salida decaída | ¿El relleno llenaría? |
|---|
Una subasta de un solo pedido, no un lote
UniswapX no enruta su pedido a través de un grupo de AMM y no lo agrupa con otros pedidos como lo hace el Protocolo CoW. Según la propia documentación de Uniswap, su pedido firmado lleva un startAmount (el resultado que obtendría si se llenara al instante, deliberadamente generoso, por lo que ningún relleno racional lo toma de inmediato) y un endAmount (tu piso, el peor precio que aceptaste antes de que caduque el pedido). En cadena, la curva de decaimiento real se define por NonlinearDutchDecayLib, que admite múltiples puntos de decaimiento intermedios, por lo que el precio puede doblarse a través de un puñado de segmentos en lugar de seguir una línea recta, pero el caso común, y lo que esta calculadora modela, es un solo segmento lineal: decayed = startAmount − (startAmount − endAmount) × transcurrido ÷ duración, moving block by block over roughly a minute from decay start to expiry.
Independent fillers watch every open order and race to be first to submit a profitable fill — a filler wins the moment the decayed amount drops to or below whatever output they can actually source elsewhere (their own execution route, e.g. through a private market maker or an AMM pool) and still turn a profit. That competition, not a fixed price, is what actually clears the order. Crucially, UniswapX itself takes no percentage fee from the swapper — it's gas-free to submit, gas-free on a failed fill, and the swapper's entire cost is just where along the curve the fill happens to land.
Cómo utilizar esta calculadora
- Enter the order's startAmount and endAmount — the output range from Uniswap's quote/order data.
- Enter the auction duration (Uniswap's docs put typical decay-to-expiry around 60 seconds) and how many seconds have elapsed.
- Enter a filler's own achievable output to see at exactly what elapsed time the order becomes profitable for them to fill.
- Read the decayed output and the scenario table across the full auction.
Preguntas frecuentes
How does the UniswapX Dutch auction price decay over time?
Per Uniswap's own documentation, each order carries a startAmount (best for the swapper, worst for a filler) and an endAmount (the swapper's floor), and the output you'd receive right now decays along that range as time passes. The simple two-point case is linear: decayed = startAmount − (startAmount − endAmount) × elapsed ÷ duration. Onchain, UniswapX's NonlinearDutchDecayLib actually supports multiple intermediate decay points so the curve can bend, moving block by block rather than on a single straight line — but a single linear segment is the common case and what this calculator models.
Why would a filler wait instead of filling immediately at startAmount?
Because startAmount is deliberately generous to the swapper (worse for the filler) so no rational filler fills instantly. Fillers compete to be the first to submit a fill once the decayed amount drops to or below what they can actually source the output for elsewhere — their own achievable execution price. Whoever can profitably fill earliest wins the order; that race is what sets the real-world clearing time, not a fixed clock.
What fee does UniswapX charge the swapper?
None at the protocol level — Uniswap's documentation describes UniswapX swaps as gas-free for the swapper (the filler pays gas) with no cost for a failed transaction. The swapper's real cost is entirely implicit in where the order fills along the decay curve. There is no separate percentage fee layered on top the way CoW Protocol charges a surplus fee.
How is this different from CoW Protocol's batch auctions?
Both are intent-based, but UniswapX runs each order through its own single-order decay with fillers competing on timing and charges no explicit protocol fee, while CoW Protocol batches orders together, settles at one uniform clearing price per pair, and explicitly charges 50% of surplus (capped at 0.98% of volume) plus a small volume fee. See the CoW Protocol fee calculator for that side.
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