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Curated shelf of public-domain philosophy and ethics texts — from ancient to early-modern thought — ranked by historical popularity. Returns title, author, year, book_id, and drill-down routes for full-text retrieval. No license, no API key required.

T+1 settlement-date calculator for trading agents: the settlement date for each caller-supplied equity trade and whether it has settled as of a given date, on the versioned NYSE holiday calendar, with SEC Rule 15c6-1 cited as a published rule. Dates and counts only, never a violation determination. Nothing is stored.

URL HTTP metadata receipt: server-side fetch of one public http/https URL, returning only transport metadata — HTTP status, final URL, redirect chain, content type and byte length — plus a receipt id. The response body is not returned and no content preview is stored. Single GET query parameter (url).

Real-time biomedical research pulse — 7d/30d/90d publication volumes from PubMed with year-over-year change for any medical or scientific topic

Settlement Reconciliation. A signed JSON observation of one Base transaction reconciling two numbers — the USDC that moved and the ceiling in force — with cap_source and cap_observed naming where the ceiling came from and whether we saw it ourselves. Verdicts: within_cap, over_cap, no_discretion (EIP-3009, where the value was fixed in the payer's signed digest), cap_not_observable, or no_settlement. Evidence hash bound into the purchase certificate, plus a stable URL serving…

Trade-lot holding-period and realized-gain calculator for trading agents: per-lot days held, the exact date each lot's gain character turns long-term, and FIFO / specific-identification allocation of a proposed sell with realized gain per lot and per-character totals. Deterministic arithmetic on caller-supplied lots with the published threshold cited (IRC §1222: held more than one year) — counts, dates, and dollars only, never advice. Nothing is stored.

USD Coin

Curated shelf: Popular literature -- Great Britain -- Periodicals — 202 public-domain books including The Mirror of Literature, Amusement, and Instruction. Volume 12, No. 339, November 8, 1828, The Mirror of Literature, Amusement, and Instruction. Volume 17, No. 484, April 9, 1831. Returns a ranked list with drill-down routes for full-text retrieval. No license, no API key required.

Curated shelf: Children's Picture Books — 172 public-domain books including The Tale of Peter Rabbit, Struwwelpeter: Merry Stories and Funny Pictures, The National Nursery Book With 120 illustrations. Returns a ranked list with drill-down routes for full-text retrieval. No license, no API key required.

Curated shelf of public-domain adventure fiction, ranked by historical popularity. Returns title, author, year, book_id, and drill-down routes for full-text retrieval. No license, no API key required.

Curated shelf: Classical literature — 12 public-domain books including The Iliad, The Metamorphoses of Ovid, Books I-VII, Apology. Returns a ranked list with drill-down routes for full-text retrieval. No license, no API key required.

Curated shelf: Biographies — 5163 public-domain books including The Love Letters of Mary Wollstonecraft to Gilbert Imlay, Modern English biography, volume 2 (of 4), I-Q, My Life — Volume 1. Returns a ranked list with drill-down routes for full-text retrieval. No license, no API key required.

Curated shelf: Movie Books — 32 public-domain books including Frankenstein; or, the modern prometheus, The Scarlet Letter, The strange case of Dr. Jekyll and Mr. Hyde. Returns a ranked list with drill-down routes for full-text retrieval. No license, no API key required.

Curated shelf: History - Warfare — 2842 public-domain books including The Anabasis of Alexander : $b or, The history of the wars and conquests of Alexander the Great, The Waterloo Roll Call With Biographical Notes and Anecdotes, A farewell to arms. Returns a ranked list with drill-down routes for full-text retrieval. No license, no API key required.

Curated shelf: Married women -- Fiction — 10 public-domain books including The Scarlet Letter, Anna Karenina, Madame Bovary. Returns a ranked list with drill-down routes for full-text retrieval. No license, no API key required.

Curated shelf: Orphans -- Fiction — 132 public-domain books including Jane Eyre: An Autobiography, The Mysteries of Udolpho, Oliver Twist, Vol. 2 (of 3). Returns a ranked list with drill-down routes for full-text retrieval. No license, no API key required.

Curated shelf: Nobel Prizes in Literature — 525 public-domain books including A farewell to arms, The Red Lily — Complete, The Lock and Key Library: Classic Mystery and Detective Stories: Modern English. Returns a ranked list with drill-down routes for full-text retrieval. No license, no API key required.

Curated shelf: Travel Writing — 3045 public-domain books including The Expedition of Humphry Clinker, Life on the Mississippi, The Travels of Marco Polo — Volume 1. Returns a ranked list with drill-down routes for full-text retrieval. No license, no API key required.

Curated shelf: Classical Antiquity — 13 public-domain books including The Iliad, The Odyssey, The Confessions of St. Augustine. Returns a ranked list with drill-down routes for full-text retrieval. No license, no API key required.

Curated shelf: Folklore — 8 public-domain books including The Aesop for Children With pictures by Milo Winter, The Blue Fairy Book, Myths and Legends of China. Returns a ranked list with drill-down routes for full-text retrieval. No license, no API key required.

Curated shelf: Classics of Literature — 1157 public-domain books including Moby Dick; Or, The Whale, Pride and Prejudice, Romeo and Juliet. Returns a ranked list with drill-down routes for full-text retrieval. No license, no API key required.

Curated shelf: Historical Novels — 3891 public-domain books including The Lady of the Lake, Twenty years after, Under the Red Dragon: A Novel. Returns a ranked list with drill-down routes for full-text retrieval. No license, no API key required.

Curated shelf: American Literature — 7572 public-domain books including Moby Dick; Or, The Whale, Little Women; Or, Meg, Jo, Beth, and Amy, Bidwell's Travels, from Wall Street to London Prison: Fifteen Years in Solitude. Returns a ranked list with drill-down routes for full-text retrieval. No license, no API key required.

Curated shelf: Philosophy & Ethics — 2479 public-domain books including Meditations, The City of God, Volume I, The Confessions of St. Augustine. Returns a ranked list with drill-down routes for full-text retrieval. No license, no API key required.