Rates Engine v0.5.0-rc.43

[v0.5.0-rc.43] — 2026-05-11

Fixed

• Fiat market_cap_usd now populates on /v1/assets/ surfaces.*
  rc.42 shipped the M2-based market-cap math but FX-pair prices_1m
  buckets have trade_count of 1-3 (snapshots, not trades); the
  default VWAPMinTradeCount=5 threshold caused tier-1 to skip the
  FX rate, leaving market_cap_usd empty on every non-USD fiat row.
  Lower the threshold to 1 for fiat — each FX observation IS the
  rate. CNY listing cap should now show ~$42T (M2 ¥302T × USD/CNY
  rate from the live FX feeds).

Added

• /v1/assets/{ticker} ticker fallback. When {ticker} is a
  3-letter ISO code matching a verified-currency entry (USD, EUR,
  CNY, …), the dispatch now resolves it via the catalogue's
  ticker index — same view as /v1/assets/{friendly-slug}.
  Lets clients hold ISO codes without a friendly-slug lookup
  table.

Changed

• /v1/currencies + /v1/currencies/{ticker} deprecated.
  Mirror of the /v1/coins deprecation from Phase 1.4a: every
  response emits Deprecation: true + Link: </v1/assets/{slug}>; rel="successor-version". Routes still serve fully; the
  Cloudflare Pages _redirects rules handle browser-side migration
  for the explorer. Direct API consumers should plan their move.