Crypto ETF Sentinel — SEC filing tracker for US spot crypto ETFs across Bitcoin, Ethereum, Solana, XRP and 30+ assets. Freshest filings surface within ~10 minutes of detection — last 50 newest-first by default, built for continuous, high-volume monitoring. Covers S-1, 424B, 8-A12B, CERT, EFFECT. Optional filters: ``currency``, ``filing_type``, ``date_after``.

Crypto ETF Sentinel — Curated directory of every active US spot crypto ETF issuer, including staking ETFs (100+ entries across 30+ cryptocurrencies). Each entry carries regulatory-stage classification (registration_filed / under_review / launch_imminent / trading / approved / withdrawn), ticker, exchange, owner organisation, and SEC CIK. Pair with paid per-issuer routes (``?cik=`` query param) to drill into comment letters, XBRL financials, or POS AM profiles.

Crypto ETF Sentinel — Single-call market snapshot for US spot crypto ETFs (Bitcoin, Ethereum, Solana, XRP and more). DB totals, filings broken down by cryptocurrency + form type, regulatory-stage counts (how many issuers are trading / launch_imminent / under_review / etc.), and an ``as_of`` ISO timestamp for stale-checking. Useful as a heartbeat for monitoring agents deciding whether to drill into the catalogue.

Crypto ETF Sentinel — Activity feed of recent notable SEC filings + comment letters for US spot crypto ETFs (Bitcoin, Ethereum, Solana, XRP and more; last 60 days by default). Tracks S-1, 424B, 8-A12B, CERT, EFFECT and review correspondence. Stage-filtered to drop trading-stage housekeeping noise — a 'what's happening in crypto ETF regulation' heartbeat for monitoring agents.

Crypto ETF Sentinel — Full SEC ↔ issuer comment-letter history for one US spot crypto ETF issuer. Returns UPLOAD/CORRESP pairs in chronological order with review-intensity classification. Comment-letter cadence is a leading indicator of how close an issuer is to approval. Pass the issuer's SEC CIK as the ``cik`` query param.

Crypto ETF Sentinel — Per-crypto regulatory wave state for US spot crypto ETFs (Bitcoin, Ethereum, Solana, XRP and more). Answers 'is asset X in an active SEC approval cycle right now?'. Returns ``in_wave``, ``first_anchor_date``, ``first_anchor_ticker``, plus counts of approved vs pending cohort members.

Crypto ETF Sentinel — Week-over-week pipeline delta for US spot crypto ETFs: change in stage counts, filings-7d, under-review count vs. a prior daily snapshot. Returns 404 (no charge) when no snapshot exists for the requested ``days_back``.

Crypto ETF Sentinel — Launch-timing tracker for ``launch_imminent`` US spot crypto ETF issuers: days-waiting + percentile vs the historical 8-A12B → CERT/EFFECT distribution. Returns the historical baseline in ``meta`` on every call, so the response is useful even when the current cohort is empty. Indicative timing data, not a predicted launch date.

Crypto ETF Sentinel — Approval-pattern signal (1-99) per under-review US spot crypto ETF issuer: how closely a filing pattern resembles historically approved vs withdrawn ETFs. A heuristic benchmark, not a probability or prediction — see limitations.

Crypto ETF Sentinel — Regulatory risk score (0-99) for every US spot crypto ETF (Bitcoin, Ethereum, Solana and more) currently under SEC review. A composite of filing cadence, time-in-stage, comment-letter intensity, and historical approval baselines — a heuristic benchmark, not a probability or prediction. See limitations.

Crypto ETF Sentinel — Under-review US spot crypto ETF issuers stalled 148+ days without comment-letter activity (a proxy for SEC inactivity). Sorted by days-since-last-activity descending. Long stalls historically correlate with withdrawal risk.

Crypto ETF Sentinel — Top-N most-active pre-approval US spot crypto ETF issuers by 42-day action-filing count. High velocity = sustained SEC dialogue, frequently predictive of imminent stage transitions.

Crypto ETF Sentinel — Side-by-side comparison of two trading US spot crypto ETFs — POS AM profile + XBRL financials + market data + Fund Health metrics. Requires ``cik_a`` and ``cik_b`` query params. Some Fund Health fields can be null if market-data fetch fails.

Crypto ETF Sentinel — Chronological profile evolution for one US spot crypto ETF issuer — custodian/fee/AP/in-kind deltas over time, derived from successive POS AM filings. Pass the issuer's SEC CIK as the ``cik`` query param.

Crypto ETF Sentinel — Latest POS AM-extracted profile for one US spot crypto ETF issuer: custodian, sponsor fee, AP list, in-kind eligibility, basket size. Pass the issuer's SEC CIK as the ``cik`` query param.

Crypto ETF Sentinel — Bulk POS AM-extracted profiles for every trading US spot crypto ETF: custodian, sponsor fee, authorized participants, basket size, in-kind eligibility. Extraction quality varies by field (in-kind ~32% TP, AP roster ~70% TP) — see API docs.

Crypto ETF Sentinel — Quarterly aggregate AUM growth across the US spot crypto ETF cohort, bucketed by BTC / ETH / Other. Useful for sizing the crypto ETF market category and tracking quarter-over-quarter momentum.

Crypto ETF Sentinel — Crypto ETF fee comparison: current expense ratio for every trading US spot crypto ETF, sorted cheapest first — compare fees and find the lowest-cost Bitcoin, Ethereum and other crypto ETFs. Outlier-capped at 200bps to drop bad XBRL extractions.

Crypto ETF Sentinel — Quarterly fee-war progression — average + median expense ratios over time across the US spot crypto ETF trading cohort. Documents how fee competition has compressed since spot Bitcoin ETF launch in Jan 2024.

Crypto ETF Sentinel — Single-issuer XBRL snapshot for one US spot crypto ETF: latest AUM, NAV per share, shares outstanding, expense ratio. Some issuers may have ``expense_ratio: null`` if XBRL extraction missed it. Pass the issuer's SEC CIK as the ``cik`` query param.

Crypto ETF Sentinel — Top-N US spot crypto ETF issuers by an XBRL TIER1 financial concept (default: AUM in USD). Daily-updated XBRL facts give an authoritative view of relative fund size across the ETF cohort.

Crypto ETF Sentinel — Historical time series for one XBRL concept (AUM, NAV, shares-outstanding, etc.) on one US spot crypto ETF issuer. Quarterly cadence. Pass the issuer's SEC CIK as the ``cik`` query param.