#beverage

Draft-beer dispense maths as an API, computed locally and deterministically — the CO₂ pressure and beer-line numbers a homebrewer, kegerator owner or bar sets a tap by. (This is the serving side; for ABV, gravity and IBU that is a homebrewing calculation.) The carbonation endpoint gives the regulator head pressure that holds a target carbonation at the serving temperature, from the standard volumes-temperature-pressure regression: 2.5 volumes of CO₂ at 38 °F needs about 11 psi, and colder beer holds the same carbonation at a lower pressure — British ales sit around 1.5–2.0 volumes, US ales 2.2–2.7, lagers and wheats higher. The balance endpoint sizes the beer line so the system pours a clean head instead of foaming or pouring slow: line length = (applied pressure − 0.5 × rise − residual) ÷ the line’s resistance per foot, where gravity adds about 0.5 psi per foot of lift and roughly 1 psi is left at the faucet — so 12 psi with no rise on 3/16-inch vinyl (≈3 psi/ft) wants about 3.7 feet, while narrower or wider tubing changes everything. Everything is computed locally and deterministically, so it is instant and private. Ideal for homebrew, kegerator, bar, brewery-taproom and beverage app developers, draft-system and troubleshooting tools, and hospitality software. Pure local computation — no key, no third-party service, instant. Dispense side only. Live, nothing stored. 2 compute endpoints.

api.oanor.com/draftbeer-api

Alcohol and cocktail maths as an API, computed locally and deterministically — the ABV, dilution and standard-drink numbers a bartender, brewer or drinks app works out behind the bar. The abv endpoint mixes a drink: pass the ingredients as a volume:abv list and it returns the final alcohol by volume = (sum of volume × ABV) ÷ total volume, so a Negroni-style 2 parts at 40 %, 1 at 20 % and 1 mixer at 0 % lands at 25 % ABV (50 US proof), with mixers diluting the result. The dilution endpoint models ice melt and stirring, which add water and drop the strength: final volume = volume × (1 + dilution) and ABV falls by the same factor while the alcohol itself is unchanged, so a 4 oz stirred drink at 25 % with 25 % dilution becomes 5 oz at 20 % — stirred drinks pick up roughly 20–25 %, shaken a little more. The standard endpoint counts the dose: pure alcohol = volume × ABV, then a US standard drink is 14 grams (0.6 fl oz) and a UK unit is 10 ml of pure alcohol, so a 12 fl oz beer at 5 % is one standard drink (14 g, 1.77 UK units) and a 5 fl oz glass of 12 % wine is one too. Everything is computed locally and deterministically, so it is instant and private. Ideal for bartending, brewing, beverage, hospitality and responsible-drinking app developers, cocktail-builder and drink-tracker tools, and bar-menu calculators. Pure local computation — no key, no third-party service, instant. Live, nothing stored. 3 compute endpoints. For drink recipes use a cocktails database API.

api.oanor.com/abv-api