#notes

Live profile and notes for any Nostr account, read straight from the open Nostr relay network — no key, no account, nothing cached. Nostr is the decentralised, censorship-resistant social protocol with no central server, so this service queries several public relays in parallel and merges and de-duplicates what they return. Give it a public key, either as 64-character hex or as an npub… key (it decodes bech32 npub keys for you), and the profile endpoint returns the account's kind-0 metadata: name, display name, about/bio, picture, banner, website, NIP-05 verified identifier and Lightning address — fiatjaf's key resolves to name "fiatjaf", NIP-05 [email protected]. The notes endpoint returns the account's most recent kind-1 text notes — the posts — newest first and de-duplicated across relays, each with its content, timestamp, note id and mention and reply counts. The relays endpoint lists the public relays queried. This is the profile-and-posts layer for any Nostr client, bot, indexer or social dashboard — live from the relay network, nothing stored. Distinct from centralised-platform social APIs — this reads the open Nostr protocol directly from its relays. 4 endpoints.

api.oanor.com/nostr-api

Music-theory maths as an API, in equal temperament with A4 = 440 Hz and scientific pitch notation (C4 = middle C = MIDI 60). The note endpoint converts freely between a note name (A4, C#5, Eb3), a MIDI note number and a frequency — and when you pass a frequency it returns the nearest note and how many cents sharp or flat it is. The interval endpoint gives the distance between two notes in semitones and cents, its name (perfect fifth, major third, …) and the exact frequency ratio. The chord endpoint returns the notes, MIDI numbers and frequencies of a chord from a root and a quality (major, minor, dim, aug, sus, 6, 7, maj7, m7, dim7, m7b5, 9 and more). The scale endpoint returns the notes of a scale or mode from a root — major, the three minor scales, the seven church modes, the major and minor pentatonics, blues, whole-tone and chromatic. Sharp or flat spelling is selectable. Everything is computed locally and deterministically, so it is instant and private. Ideal for music apps and games, synthesizers and DAWs, ear-training and theory teaching, tuners and MIDI tools. Pure local computation — no key, no third-party service, instant. Live, nothing stored. 5 endpoints. This is music theory; for searching tracks and artists use a music API and for the classical repertoire use a classical-music API.

api.oanor.com/musicnote-api