Rates Engine v0.5.0-rc.31

[v0.5.0-rc.31] — 2026-05-08

Fixed

• /v1/chart: stablecoin-proxy fallback for X/fiat:USD. The
  chart endpoint previously returned 0 points for any base asset
  paired with fiat:USD (e.g. native/fiat:USD) because the
  synthetic stablecoin → USD mapping is applied at /v1/coins
  read-time only — prices_1m only contains literal classic-quote
  pairs like native/USDC-GA5Z…. The handler now retries against
  the operator-declared USD-pegged classics
  (trades.usd_pegged_classic_assets) when the literal pair has
  zero points, marking the response flags.triangulated=true for
  transparency. The XLM/USD chart on the asset page goes from
  empty to populated as soon as the API binary is redeployed.

Performance

• Explorer: lazy-load lightweight-charts (~155 KB). The candle
  chart on /markets/[pair] and /assets/[slug]?tab=chart is now
  fetched on-demand via next/dynamic. First-load JS for those
  routes drops by roughly the same amount; other tabs on the asset
  page (overview / supply / history) no longer pay the bundle tax.
• Explorer: stable staleTime on read-mostly queries.
  /v1/sources, /v1/issuers, /v1/issuers/{g}, /v1/markets,
  /v1/history, /v1/assets/{id}, and /v1/changes/... all gained
  cache windows (60s–5min) so route-revisit nav re-uses recently
  fetched data instead of re-hitting the network. /v1/markets
  also got placeholderData: prev to keep the table populated
  while pagination/filters fan out.

Added

• Explorer: /lending/[pool] detail pages. Every Blend pool
  observed in the auction stream now has its own static-prerendered
  detail route — auction counts, last-seen timestamp, curated
  annotation (Backstop V2, Pool Factory V2 where known), and a
  stellar.expert deep link. Rows on /lending are now clickable.
  Per-reserve composition (which assets the pool accepts, current
  supply/borrow APYs) remains pending the Blend pool-storage
  reader (#84).

• Divergence: Chainlink reference enabled by default on r1. The
  [divergence.chainlink] block is now baked into the
  archival-node Ansible template with EUR/USD, GBP/USD, JPY/USD
  AggregatorV3 mainnet feeds. Off-chain HTTP cross-check via
  eth.llamarpc.com — does not contribute to VWAP. The divergence
  refresher now reports reference_count: 2 (coingecko +
  chainlink) at start-up.