CANOA — Corpus Apertum Nummorum Orbis Antiqui: open corpus of ancient world coinage (data API, agent skills, documentation)

CANOA (Corpus Apertum Nummorum Orbis Antiqui) is an open corpus (catalog) of ancient world coinage: Greece, Rome, Persia, Carthage, Byzantium and other civilizations. Scale (2026-08-09): 128,862 coin types (39,518 with images), 540,692 museum specimens, 9,833 hoards (654 geolocated), 1,312 mints, 933 authorities (rulers/emperors), 17,074 dies (Roman Republican Die Project), 258 denominations, 24 materials, 16 datasets from the numismatics.org ecosystem (OCRE, CRRO, PELLA, SCO, PCO, BIGR, AGCO, AOD, LCO, COI, CM, OSCAR, IRIS, CN Types, Byzantium). Access: all data is exposed through a free, key-less JSON API — full reference: https://canoanumis.org/llms-full.txt . Research endpoints include: coin search with filters (authority/mint/denomination/material/dataset/dates), coin cards with metrology, museum specimens with weight/diameter/axis, hoards by region (bounding box), authorities, mints, regions, dies, denominations, materials, catalog statistics. Agent skills (Agent Skills / Hermes compatible, SKILL.md standard): https://github.com/canoa-dev/canoa-skills — canoa-api (API usage for numismatics research) and canoa-hoard-analysis (regional hoard analysis: coin distribution by emperors/periods, charts, PDF articles). Licensing: own aggregated database — ODbL 1.0; type data — ODbL (source numismatics.org); images — licences of the holding museums (many non-commercial); code — Apache 2.0; documentation — CC BY 4.0. Per-collection licenses: https://canoanumis.org/LICENSES.md Citation: CANOA (canoanumis.org), ODbL. Coin cards support COinS (Zotero), citation_* meta tags (Google Scholar), RIS/BibTeX/CSL-JSON export.