{"service":"ga10-perf v2","endpoints":{"POST /bond/return":"{ isin, start_price, end_price, start_date, end_date }","POST /portfolio/performance":"{ bonds: [{isin, weight, start_price, end_price, description?, country?}], start_date, end_date }","GET  /bond/coverage":"?isins=ISIN1,ISIN2 — data gap report"}}