The comment at every setMinFee call site said "500K is a comfortable
floor" but the actual value was 200K — the floor wasn't high enough to
cover lucid 0.4.30's Conway-era fee underestimation. Smoke-tested
mainnet Accept tx hit Ogmios code 3122: lucid declared 343,132 lovelace
fee but Ogmios required 347,726 (off by ~5K). With the floor at 200K
the floor was inert (343K > 200K), so the underestimated fee stood.
Bumping all six builder paths (PostEscrow, Claim/Submit, Accept,
Reclaim, PostAdvert, UpdateAdvert/RetireAdvert) to 500K — comfortably
above the empirical minimum across operations, ~0.15 AP3X surcharge
per tx, excess becomes change.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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