#tabletop

The BoardGameGeek community ranking of 17,000+ board games as an API — a self-contained reference for game, hobby, recommendation and quiz apps. For each game the API returns its BoardGameGeek id, name, year published, community rank, average user rating, the Bayesian ("geek") average, how many users rated it and links to its BGG page and thumbnail. Look a game up by name or id, search by name (best-ranked first), list the top-ranked games, or list the games published in a given year. The ranks and ratings are a BoardGameGeek community snapshot (2019), while the catalogue of games, ids, names and publication years is a stable reference. Served from memory — always fast.

api.oanor.com/boardgames-api

Canasta card-game scoring as an API, computed locally and deterministically and exactly — the point counting that makes Canasta famously fiddly, done for you. The card-value endpoint totals the point value of a hand or meld: a joker is 50, aces and twos 20, eights through kings 10, fours through sevens and black threes 5, and a red three a 100-point bonus card — so a joker, an ace, a king, a seven and a red three come to 185. The bonus endpoint adds the round bonuses: a natural (pure) canasta is 500, a mixed canasta 300, each red three 100 (all four double to 800), going out 100, and going out concealed a further 100 — two naturals, a mixed, three red threes and going out is 1,700. The hand-score endpoint nets it out: the card points you melded, plus the bonuses, minus the card points left stranded in your hand when the round ends. Everything is computed locally and deterministically, so it is instant and exact. Ideal for Canasta apps, online card-room scorekeepers, club and family game-night tools, and learning aids. Pure local computation — no key, no third-party service, instant. Exact integer maths. Live, nothing stored. 3 compute endpoints. Classic Canasta values; rule variants differ.

api.oanor.com/canasta-api

Dominoes scoring as an API, computed locally and deterministically and exactly — the points behind a game of bones, whether you play Block, Draw or All Fives. The score endpoint gives the winner's points at the end of a hand: when a player dominoes or the game blocks, the winner takes the total pip count left in the opponents' hands — pass each opponent's remaining pips and it sums them, optionally rounding to the nearest five as many house rules do, so 12, 8 and 23 left on the table is 43, or 45 rounded. The fives endpoint scores All Fives (Muggins): a play scores whenever the open ends of the layout add up to a multiple of five, and you score that sum — open ends of 3 and 2 make 5 for five points, 5-5-5 across a spinner makes 15, while a 6 scores nothing. The set endpoint gives the statistics of a double-N set: a double-six has (6+1)(6+2)/2 = 28 tiles and 168 total pips, a double-nine has 55 tiles and 495 pips, with the heaviest tile and its pip value. Everything is computed locally and deterministically, so it is instant and exact. Ideal for dominoes apps, online and club scorekeepers, game-night and tournament tools, and learning aids. Pure local computation — no key, no third-party service, instant. Exact integer maths. Live, nothing stored. 3 compute endpoints. Standard Western dominoes; regional variants score differently.

api.oanor.com/dominoes-api

Riichi (Japanese) mahjong scoring as an API, computed locally and deterministically and exactly — the points a winning hand pays, straight from the scoring table, not a lookup you have to memorise. The score endpoint turns han and fu into the payment using base = fu × 2^(2 + han): a ron pays base × 4 (a dealer ron × 6) rounded up to the nearest 100, while a tsumo splits base × 2 from the dealer and base × 1 from each non-dealer (a dealer tsumo takes base × 2 from all three) — so a non-dealer 3 han 30 fu ron is 3,900, a 4 han 30 fu is 7,700, and a non-dealer mangan ron is 8,000. The limit endpoint classifies a hand: mangan (5 han, or 3–4 han where the fu pushes the base to 2,000), haneman (6–7), baiman (8–10), sanbaiman (11–12) and yakuman (13+), with the base points behind each. The honba endpoint adds the table bonuses — 300 per honba counter and 1,000 per riichi stick — on top of the won hand. Everything is computed locally and deterministically, so it is instant and exact. Ideal for mahjong apps, online-table and scorekeeper tools, club and tournament software, and learning aids. Pure local computation — no key, no third-party service, instant. Exact scoring-table maths. Live, nothing stored. 3 compute endpoints. Japanese riichi rules; other variants (MCR, Hong Kong) score differently.

api.oanor.com/mahjong-api

Tabletop dice-probability maths as an API, computed locally and deterministically and exactly — the odds behind the rolls, not the rolls themselves. The advantage endpoint gives the D&D-style chances of beating a target on a d20 (or any die) rolling normally, with advantage (roll twice, keep the higher) or with disadvantage (keep the lower): needing an 11+ is 50 % normally, 75 % with advantage and 25 % with disadvantage, and it reports the average roll — advantage lifts a d20 from 10.5 to about 13.8. The pool endpoint handles success-counting systems (World of Darkness, Shadowrun): for a pool of dice that succeed on a face at or above a threshold it gives the chance per die, the expected number of successes and the exact binomial probability of getting exactly, or at least, a target number — six d10s succeeding on 7+ average 2.4 successes with a 45.6 % chance of three or more. The exploding endpoint gives the mean of an exploding ("acing", open-ended) die that re-rolls and adds on its maximum face — a d6 averages 4.2 instead of 3.5. Everything is computed locally and deterministically, so it is instant and private. Ideal for tabletop, virtual-tabletop, game-design and TTRPG app developers, odds-and-probability helpers, and game-master tools. Pure local computation — no key, no third-party service, instant. Exact maths, no simulation. Live, nothing stored. 3 compute endpoints. For random rolls use a dice-roller API.

api.oanor.com/dicepool-api

Dungeons & Dragons 5th-edition encounter-building maths as an API, computed locally and deterministically — the XP-budget and difficulty numbers a Dungeon Master balances a fight with. The budget endpoint sums the per-character XP thresholds from the DMG across the party — by party size and level, or a list of mixed levels — to give the easy, medium, hard and deadly budget for one encounter (a party of four 5th-level characters has thresholds of 1,000 / 2,000 / 3,000 / 4,400 XP), plus the total adventuring-day budget. The difficulty endpoint rates an encounter: it sums the monsters' XP, multiplies by the encounter multiplier for the number of monsters (×1.5 for two, ×2 for three to six, up to ×4 for fifteen or more), and compares the adjusted XP to the party thresholds — four 450-XP monsters against that party come to 3,600 adjusted XP, a hard fight. The carry endpoint gives the carrying capacity (Strength × 15, scaled by size), push/drag/lift and the encumbrance thresholds. Everything is computed locally and deterministically, so it is instant and private. Ideal for tabletop, virtual-tabletop, DM-tool and TTRPG app developers, encounter-builder and balance tools, and game-master education. Pure local computation — no key, no third-party service, instant. Uses the DMG tables. Live, nothing stored. 3 compute endpoints. For monster stats and spells use a D&D SRD data API.

api.oanor.com/dndencounter-api

The complete Dungeons & Dragons 5th-edition System Reference Document as an API — spells, monsters, classes, subclasses, races, backgrounds, equipment, magic items, conditions, features, feats, skills and the full rules reference. Look up a spell by name (e.g. Fireball → 3rd-level evocation, 150 ft, 8d6 fire) or a monster statblock (e.g. Adult Red Dragon → CR 17, AC 19, 256 HP, legendary actions), list and filter any resource type (spells by level or school, monsters by challenge rating), or fetch full detail for any of the 24 SRD categories. Backed by the open dnd5eapi.co dataset. Ideal for character builders, virtual tabletops, encounter and spell-card generators, Discord bots and homebrew tools.

api.oanor.com/dnd-api