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Market research API — what exists in a niche, with its interval
Coverage first, then the series. Every window carries the real interval it was collected over, so a division by hours cannot go quietly wrong.
The problem
Research needs to know what is in the set before it measures the set. Asking for a niche nobody archived spends the call and returns nothing, so the coverage call comes first — and it is free.
What answers it — 3 endpoints
archive/coveragearchive/trendsarchive/movers
Shape, parameters and the errors each one returns are in the endpoint reference, generated from the same catalogue the router reads.
The recipe
What was trending the day a competitor launched — the steps, with real commands and real output, plus the measured caveats that change the result.