Your Users Don't Blame the Chain. They Blame Your App.

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Summary

An engineering post-mortem dressed as an anniversary piece: three years of SimpleSwap routing KAS, and what that taught about the layer nobody puts on a landing page.

KAS was never the biggest asset by volume — what it surfaced was a decade-old assumption that no longer held.

“Fast chains did not get rid of latency. They just pushed it into a layer no one had ever measured, because there had never been a reason to measure it.”

Key Takeaways

  • A late or mispriced swap becomes the integrator's support problem, not the provider's.
  • Four demands of an execution layer: keep the promise, own the explanation, hold up on the worst day, stay out of the roadmap.
  • An estimate is built from live quotes weighted by depth, and it expires.
  • Kaspa went from about one block per second in 2023 to ten after the Crescendo hard fork.
  • Faster chains relocated latency into an unmeasured layer rather than removing it.
  • The closing principle: an estimate is a commitment with an expiry, not a forecast.

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