Use when an agent needs to backtest or chart how a stock perp's premium/discount and funding evolved, including weekends and holidays when the stock is shut. One ticker: trade.xyz perp mark/oracle vs stock and xStock, basis, funding, OI, Aster/Lighter/OKX cross-venue gaps; 30-minute snapshots plus ~60d backfill, up to 90 days per call. Bad params return 400/404 before any charge. Errors: 400, 402, 404, 502. Data, not advice.

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