TLDR Tech / Crypto
Fynd now reads Flashblocks on Base
Base's Flashblock architecture produces new block state every 200ms, but most DEX aggregators rely on RPC calls that take 250ms+ per fetch, leaving routers operating on state 10-50 Flashblocks behind and top aggregators potentially 15 seconds stale across hundreds of thousands of pools. PropAMMs exploit this gap by posting competitive prices in the final Flashblock of block N, then widening spreads at the start of block N+1 when trades settle. 0x analysis across 461 blocks found this pattern occurs 97.4% of the time, costing traders 5-10 bps per affected swap. Fynd, PropellerHeads' locally deployed router, streams Flashblock deltas into in-memory state so every quote reflects current rather than prior-block pricing, leaving propAMMs unable to predict which Flashblock state Fynd routes against and wrong on 9 of 10 Flashblocks. The local deployment also removes the ~500ms round-trip overhead of external aggregator APIs, a latency edge CEX-DEX arbitrage teams require when building hundreds of quotes per pair per block.
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