stablecoin-peg: Coinbase USDT source, fee-cancelling DAI mid, p50 copy alignment - #994
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July 8, 2026 15:08
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Coinbase USDT-USD ticker added as a USD-quoted source (live-verified). DAI switches from two directional Curve get_dy sources to one geometric-mean mid, sqrt(rev/fwd), which cancels the pool swap fee exactly so DAI is comparable to CEX mids. Spec prose aligned on p50 sort with p99 tail column; DAI source-class difference stated in methodology. Reviewed, go build/vet + SpecSchema OK.