SentimentFX

Returns Pearson `r`, `p_value`, `n_days` overlapping, a 95% confidence
interval (Fisher z), and a categorical `strength` (strong / weak /
inconclusive).  Costs 1 API credit — same as GET /v1/correlation/{ticker}.

Requires ≥30 overlapping day-pairs.  Under that, returns a `note` field
explaining what's missing so a caller can suggest waiting or switching
to a higher-coverage ticker.

Costs 1 API credit per day actually returned — same as
GET /v1/prices/{ticker}.  Prices come
back reverse-chronological.  Crypto is GBP (yfinance BTC-GBP etc.), FX
pairs are a raw exchange rate in the pair's native convention (e.g.
USDJPY is yen per dollar), and everything else (stocks/ETFs/commodity
futures) is native USD -- there is no currency conversion.

Each headline has a `sentiment_score` in [-1, +1] (positive_prob -
negative_prob), a categorical `sentiment_label`, and a `source_kind`
(news / reddit / stocktwits / x / youtube).  Costs 1 API credit per 25
headlines actually returned — same billing as GET /v1/sentiment/{ticker}.
An empty result costs nothing.

`limit` is capped at 100.  Social posts are kept separate from news:
the default `sources="news"` returns editorial news, `"social"` returns
only Reddit, StockTwits and X posts, and `"all"` returns both, labelled
by `source_kind`.  Titles come back reverse-chronological so the first
item is the freshest.

Each entry has `avg_sentiment` (unweighted mean of that day's scores),
`article_count`, and a directional `label` (positive / negative /
neutral, thresholded at ±0.1).  `sources="social"` returns a separate
daily average of Reddit, StockTwits and X posts; news and social are
never averaged together.  Costs 1 API credit per day actually returned —
same as GET /v1/summary/{ticker}.  A window with no coverage costs nothing.

Free keys get 1,000 calls per 30-day window starting at their first
billable call (`resets_at` is null when no window is running); paid plans
refill on the 1st of each month.  Free — doesn't hit the billing meter.
Useful before a large batch of `get_sentiment`/`get_summary` calls to check
you have credit headroom.

Cheap (free — doesn't hit the billing meter).  Returns two groups:
`primary` (5 crypto + 7 FX pairs — the ones with full sentiment coverage
across the primary RSS feeds), and `background` (US equities, ETFs,
commodity futures — coverage is thinner but real).  Use the exact ticker
string from either group as the `ticker` arg to the other tools.