#audio

Audius as an API — the decentralised music streaming platform, returned as clean JSON, no key. Search tracks, artists and playlists; pull trending tracks by genre and time window; look up a track (genre, mood, bpm, musical key, ISRC, play/favourite/repost counts, artwork and a durable stream URL), an artist (followers, track and playlist counts, bio, location) by id or @handle, an artist's own tracks, and a playlist or album with its full track list. Every track comes with a ready-to-play stream URL and a preview URL. Live data straight from the Audius discovery network. Distinct from mainstream catalogues: Audius is an independent, creator-owned catalogue of electronic, hip-hop and underground music with actual streamable audio — ideal for music-discovery apps, players, DJ tools and Web3 music projects. 8 data endpoints. Authenticated with an x-oanor-key; fair-use rate limits per plan.

api.oanor.com/audius-api

Mixcloud as an API — the home of long-form audio: DJ mixes, radio shows and podcasts, returned as clean JSON, no key. Search cloudcasts, users or tags; look up a user profile (followers, listens, location, picture) and their shows; get a cloudcast's full detail — play count, favourites, reposts, listener count, audio length, tags and uploader; read a show's comments; pull the trending cloudcasts for any tag or category; and list Mixcloud's categories. Live data straight from Mixcloud's public API. Distinct from track-based music APIs: Mixcloud is hour-long mixes, broadcast archives and shows — ideal for music-discovery apps, radio and DJ directories, podcast tools and audio dashboards. 8 data endpoints. Authenticated with an x-oanor-key; fair-use rate limits per plan.

api.oanor.com/mixcloud-api

Vinyl-record geometry maths as an API, computed locally and deterministically — the playing-time, groove-length and groove-speed numbers a cutting engineer, pressing plant or audio hobbyist works a record out with. The playing-time endpoint gives a side's maximum time = the number of groove turns ÷ the turntable speed, where the turns = the recorded band's radial width ÷ the groove pitch (the spacing between adjacent grooves): a 12-inch LP with ~85 mm of band at a 100 µm pitch holds about 850 turns, so at 33⅓ rpm that is roughly 25 minutes a side — a tighter pitch fits more time but cuts groove amplitude and so loudness and bass, the classic time-versus-level trade. The groove-length endpoint unrolls the spiral: length ≈ turns × the mean circumference (π × the average of the outer and inner diameters), on the order of 400–500 metres for an LP side, the whole of which the stylus traces once. The groove-speed endpoint gives the linear speed under the stylus = 2π × rpm/60 × radius, so the outer grooves of an LP pass at about 50 cm/s but the inner ones only ~20 cm/s — the cause of inner-groove distortion and why engineers place quieter tracks last. Everything is computed locally and deterministically, so it is instant and private. Ideal for record-cutting and mastering tools, hi-fi and collector apps, and audio-engineering calculators. Pure local computation — no key, no third-party service, instant. 3 compute endpoints. For musical note and tempo maths use a music API.

api.oanor.com/vinyl-api

Helmholtz-resonator acoustics as an API, computed locally and deterministically. The frequency endpoint computes the resonant frequency of a Helmholtz resonator — a cavity with a neck, like a bottle or a ported speaker box — from the neck area (or diameter), the neck length and the cavity volume, f = (c/2π)·√(A/(V·L_eff)), adding the acoustic end correction (about 0.85·radius for a flanged end and 0.61·radius for a free end) so a short or open neck resonates lower than its physical length suggests. The design endpoint inverts the relation, V = A·c²/(L_eff·ω²), to give the cavity volume needed to tune a resonator or a muffler chamber to a target frequency. The port-tuning endpoint sizes a bass-reflex (vented loudspeaker) box port in practical audio units — from the box volume in litres and the port diameter in centimetres it gives the tuning frequency for a given port length, or the port length required for a target tuning frequency, using the 0.732·diameter end correction. Core endpoints use SI units; the speed of sound defaults to 343 m/s. Everything is computed locally and deterministically, so it is instant and private. Ideal for audio, loudspeaker-design, musical-instrument, muffler and acoustic-treatment app developers, bass-reflex and resonator tools, and acoustics education. Pure local computation — no key, no third-party service, instant. Live, nothing stored. 3 endpoints. This is Helmholtz resonance; for room reverberation use a reverberation API and for standing waves on strings and in pipes a standing-wave API.

api.oanor.com/helmholtz-api

Musical timing maths as an API — turn a tempo into exact times. The durations endpoint gives the length of every note value (whole down to sixty-fourth, plus dotted and triplet variants) at a given BPM, in milliseconds, in hertz, and in samples at your sample rate. The delay endpoint is the producer's note-to-millisecond tool: the delay and reverb times for 1/1 to 1/32 (straight, dotted and triplet) so time-based effects lock to the tempo. The bar endpoint gives the duration of a bar for any time signature. The convert endpoint turns BPM into milliseconds per beat (and back) and names the Italian tempo marking — Largo, Adagio, Andante, Moderato, Allegro, Presto and the rest. Everything is computed locally and deterministically, so it is instant and private. Ideal for DAWs and music-production tools, drum machines and sequencers, delay and echo plug-ins, metronomes, and audio apps. Pure local computation — no key, no third-party service, instant. Live, nothing stored. 4 endpoints. This is tempo and rhythm timing; for notes, intervals, chords and scales use a music-theory API.

api.oanor.com/tempo-api

Acoustics and decibel maths as an API. The decibel endpoint converts between a linear ratio and decibels, in either the power convention (10·log₁₀) or the amplitude/pressure convention (20·log₁₀), in both directions. The combine endpoint adds sound levels the way real (incoherent) sources combine — by energy summation, so two equal 80 dB sources give 83 dB, not 160 — and can also subtract a known source from a measured total. The distance endpoint applies the inverse-square law to a point source in a free field (−6 dB per doubling of distance) to find the level at a new distance. The wavelength endpoint converts between frequency and wavelength for sound, deriving the speed of sound from the air temperature (or a value you provide). Everything is computed locally and deterministically, so it is instant and private. Ideal for audio engineering and live sound, room and architectural acoustics, noise assessment and environmental monitoring, and physics teaching. Pure local computation — no key, no third-party service, instant. Live, nothing stored. 5 endpoints. This is acoustics maths; for electrical circuits use an Ohm's-law API and for general unit conversion use a unit API.

api.oanor.com/soundlevel-api

Read SoundCloud in real time — no login or key needed. Full-text search across everything or specifically tracks, users and playlists; resolve any soundcloud.com URL to its object; and fetch a track's detail and comments, a user's profile, their tracks, playlists, likes, followers and following, a playlist's detail, and the trending charts by genre. Tracks, users and playlists are addressed by numeric id (from search/resolve). The public web client_id is resolved automatically and refreshed on expiry; every call is live (no cache) and returns the upstream SoundCloud shape, paginated with limit + offset. 16 endpoints. Built for music discovery, artist and audience analytics and audio content aggregation. A SoundCloud (creator audio) data API — distinct from the Music API (Deezer commercial catalog). No upstream key, no cache.

api.oanor.com/soundcloud-api

The Internet Archive as an API — the non-profit digital library of over 40 million freely accessible items: books and texts, audio and live-music concerts, films and video, software, images and archived web pages. Search the entire archive by keyword with full Lucene field syntax (by creator, title, subject, collection and more), filter by media type (texts, audio, movies, image, software, web, live concerts) and sort by downloads, date or trending popularity, getting each item's identifier, title, creator, media type, year, download count and collections; read an item's full metadata including its description, creators, subjects, language, collections, publisher, license, dates and total size; list an item's downloadable files with their format, size, length and a direct download URL; and look up the closest Wayback Machine snapshot of any web page — the archived flag, the snapshot date and HTTP status, and the web.archive.org link, optionally near a target timestamp. Ideal for research, digital preservation, media discovery, dataset building, link-rot recovery and apps that surface public-domain and openly-licensed culture. Data from the Internet Archive (archive.org).

api.oanor.com/archive-api

Convert text into natural-sounding speech audio (WAV) in 30+ languages and voices, with adjustable speaking speed, pitch and amplitude. Returns raw audio/wav or base64-encoded JSON — ideal for voice notifications, accessibility, IVR prompts and audio content generation. Fully self-hosted, no third-party voice service.

api.oanor.com/tts-api

Search the Apple podcast directory, fetch podcast details (artwork, genre, feed, episode count) and full episode lists with audio URLs, durations and publish dates — by resolving each show's RSS feed. Great for podcast players, discovery and analytics.

api.oanor.com/podcasts-api

Search millions of tracks, artists and albums and fetch their details — including 30-second audio previews, cover art, durations, fan counts and full tracklists. Powered by Deezer.

api.oanor.com/music-api