{"id":2201547,"recorded_at":"2026-11-02T19:13:26.613198Z","observed_at":"2026-11-02T19:13:26.613151Z","subject_kind":"source_record","subject":"x402_bazaar:https://music-theory.x402tookit.com/freq-note","kind":"listing","method":"sync.x402_bazaar/1","body":{"endpoints":[["x402","https://music-theory.x402tookit.com/freq-note"]],"name":"Music Theory","owner_address":"0xb531320805c5bed1d46aeadcf4f008fdf172dbda","raw":{"accepts":[{"amount":"20000","asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","extra":{"name":"USD Coin","version":"2"},"maxTimeoutSeconds":300,"network":"eip155:8453","payTo":"0xb531320805C5BED1D46AEaDcF4F008FDF172DBDa","scheme":"exact"},{"amount":"20000","asset":"EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v","extra":{"feePayer":"D6ZhtNQ5nT9ZnTHUbqXZsTx5MH2rPFiBBggX4hY1WePM","transactionVersions":[0]},"maxTimeoutSeconds":300,"network":"solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp","payTo":"DUPiupXtuox38dcGoXUKer5mAydCzmaHjrbQ66qeEm8s","scheme":"exact"},{"amount":"20000","asset":"0x3c499c542cEF5E3811e1192ce70d8cC03d5c3359","extra":{"name":"USD Coin","version":"2"},"maxTimeoutSeconds":300,"network":"eip155:137","payTo":"0xb531320805C5BED1D46AEaDcF4F008FDF172DBDa","scheme":"exact"},{"amount":"20000","asset":"0xaf88d065e77c8cC2239327C5EDb3A432268e5831","extra":{"name":"USD Coin","version":"2"},"maxTimeoutSeconds":300,"network":"eip155:42161","payTo":"0xb531320805C5BED1D46AEaDcF4F008FDF172DBDa","scheme":"exact"}],"description":"Frequency in Hz to the nearest note, MIDI number and offset in cents; adjustable A4 reference; tuner-style result.","extensions":{"bazaar":{"info":{"input":{"method":"GET","queryParams":{"hz":442},"type":"http"},"output":{"example":{"a4Hz":440,"asOf":"2026-10-11T14:26:13.473Z","centsOffset":7.85,"degraded":false,"direction":"sharp of the note","disclaimer":"Screening signal computed from the named public source. Not financial, legal or investment advice; provided as is. Verify at the source before acting.","fractionalMidi":69.0785,"frequencyHz":442,"midi":69,"nearestFrequencyHz":440,"nearestNote":"A4","notChecked":["octave errors from a pitch detector (this assumes the frequency you gave is the fundamental)","non-equal temperaments","…1 more"],"reasons":["Cents = 1200 x log2(f / f_note); 100 cents is one semitone.","IN_TUNE means within 5 cents of the nearest note."],"source":"computed locally (12-tone equal temperament)","summary":"442 Hz is A4 (MIDI 69) +7.85 cents (A4 = 440 Hz).","verdict":"OFF_PITCH"},"type":"json"}},"schema":{"$schema":"https://json-schema.org/draft/2020-12/schema","properties":{"input":{"additionalProperties":false,"properties":{"method":{"enum":["GET"],"type":"string"},"queryParams":{"properties":{"a4":{"description":"Reference pitch for A4 in Hz, 400 to 480 (default 440)","type":"number"},"accidentals":{"description":"sharps (default) or flats for the note name","type":"string"},"hz":{"description":"Frequency in Hz, 8 to 14000","type":"number"}},"required":["hz"],"type":"object"},"type":{"const":"http","type":"string"}},"required":["type","method"],"type":"object"},"output":{"properties":{"example":{"properties":{"a4Hz":{"type":["null","number"]},"asOf":{"type":["null","string"]},"centsOffset":{"type":["null","number"]},"degraded":{"type":["boolean","null"]},"direction":{"type":["null","string"]},"disclaimer":{"type":["null","string"]},"fractionalMidi":{"type":["null","number"]},"frequencyHz":{"type":["null","number"]},"midi":{"type":["null","number"]},"nearestFrequencyHz":{"type":["null","number"]},"nearestNote":{"type":["null","string"]},"notChecked":{"items":{"type":"string"},"type":["array","null"]},"reasons":{"items":{"type":"string"},"type":["array","null"]},"source":{"type":["null","string"]},"summary":{"type":["null","string"]},"verdict":{"type":["null","string"]}},"type":"object"},"type":{"type":"string"}},"required":["type"],"type":"object"}},"required":["input"],"type":"object"}}},"lastUpdated":"2026-11-01T23:39:36.357Z","quality":{"l30DaysTotalCalls":2,"l30DaysUniquePayers":2,"lastCalledAt":"2026-11-01T23:39:36.171Z"},"resource":"https://music-theory.x402tookit.com/freq-note","serviceName":"Music Theory","tags":["music","tuner","frequency","cents"],"type":"http","x402Version":2},"source":"x402_bazaar","summary":"Frequency in Hz to the nearest note, MIDI number and offset in cents; adjustable A4 reference; tuner-style result."},"body_sha256":"56e3883a660849fec469dce92f4363d0c7a969469e0eb81633513191aea77096","prev_id":null,"leaf":"0xb6c750cfcfb29e3335137441e13710f90b5ccb48aaee6c6b3d0d831f7ebdf420","leaf_text":"{\"body\":\"56e3883a660849fec469dce92f4363d0c7a969469e0eb81633513191aea77096\",\"id\":2201547,\"kind\":\"listing\",\"method\":\"sync.x402_bazaar/1\",\"observed_us\":1793646806613151,\"prev\":null,\"subject\":\"x402_bazaar:https://music-theory.x402tookit.com/freq-note\",\"subject_kind\":\"source_record\"}","day":{"day":"2026-11-02","leaves":444186,"root":"0x78fecaabbe319e56f5c4b80fc02e2052e198ad24781da8832a475ff65f2002d1","chained":"0xdc35957db5d1371ca382b9152878ffece28ec7c5cb4f98fd71ddb367f8b999b2","anchor_chain":"eip155:5042002","anchor_tx":"0x56b814612eb2e3e544153df3e91e1f7199106d1e430c7d8c6b653feeb9ebe9af","anchor_block":70432815},"proof":["0xb6c72d72a26a3ecd0e8831c697da309b93f2528fbedb8c60264dd527178169aa","0x35759a92cd55a46e7afd99dbf46bb160a77db27b12e1a67ebd84caaafac7232d","0x14c2bcc8d2e4e3aae081534a5948317280066e7eb2d87a96c3a767adca653fb0","0x022232e3a6e8999a3e928bab85d168613badf2decc467770c17af8bb64352c60","0xb61afb5efeabde973f97f5e6106349fb581498ea04eb1d5d5bc1098a4cb62070","0x1b28adf9e33468cd6a6289f0abf8dd02f8a72b99b6180c555c0bd047bcbfcbf1","0x4ef9594661e57160bc9866c6e9b51fcb93739f09851e0b88648f727a0c1bfd29","0x169fa5b880e3cc8be889d598630f7e9e0157ee3720d99e2c7c5633c73532af56","0x75df693af41ba1351bca8aa60151ff44598833a699a6ee119aa5d47b986de45b","0xc9c8f640713eae41e8f93d0df0f8d780c508a161d00d08d1bebbf047704f6e07","0xb90715a9e02eae65281cf69fec6269cca4f892eb446184da6ee783020656c01f","0x1e746a5fe19cb9ec0a19b0ddff5c240ad1117a5db0999c1e01fe8f1235d88e30","0x030e61e00342e920981555e2e665fa5ec4a741b10a078f282daa829896c87583","0x08da04eef748b7ac08271324db18913501d72c52afa240bf3f08b6da46e3b97f","0x834b6b9a36b42da183e2542785e8d2d7548ace455268a81922edbe6020cef644","0x2922573a524a0694086782ac45fa3083d3fc3f6a2a479b2105e1e2f06b2916f7","0x07ad80c0c234ecea379a2f4450dfd0804db049dbc62abe77af6306049ca6b6c2","0x98cbbf2c68ab4c0b4db782aeb88bea1f30b02178cf8b5d3d24a931d19492ea6d","0x252cce55f1a3d5391c16f82d7f62494429a5f69b03486d4cfcfb7b2c96d6c884"]}