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Halowerk Music Interval N-gram Jaccard Similarity
x402
Halowerk Music Interval N-gram Jaccard Similarity is a paid API for AI agents from creator.halowerk.com, paid per call via x402, $0.004/call, status unknown (last checked 2026-09-14).
Converts two MIDI note sequences to pitch-interval n-grams and computes their Jaccard similarity score
Price / call$0.004
Success—
StatusUnknown
How this service works
Converts caller-supplied MIDI-note sequences to adjacent pitch intervals, forms fixed-length interval n-gram sets and reports Jaccard overlap. It does not analyze rhythm, harmony, timbre, recordings, access to prior work or legal substantial similarity, and cannot determine plagiarism.
Output
Returns the Jaccard similarity score between the reference and candidate melody's interval n-gram sets — a value between 0 (no shared interval patterns) and 1 (identical interval n-gram sets). Also returns the computed interval n-gram sets derived from both MIDI note sequences.
Example use cases
Melody similarity check for composers
“I wrote a melody and want to know if it accidentally shares too many interval patterns with a reference tune — reference MIDI notes are [60,62,64,65,67,69,71,72] and my candidate notes are [62,64,66,67,69,71,73,74], use an n-gram size of 3.”
Music copyright analysis tool pre-screening
“Before sending this to our legal team, can you run a quick interval n-gram comparison between the original track's MIDI notes [55,57,59,60,62,64,65,67] and the allegedly copied melody [55,57,59,62,64,65,67,69] with n-gram size 4 and give me the Jaccard similarity?”
Algorithmic music plagiarism triage pipeline
“I need to triage a batch — start with these two: reference MIDI sequence [48,50,52,53,55,57,59,60] and candidate [50,52,54,55,57,59,61,62], n-gram size of 2, and report the Jaccard overlap so I can decide which pairs need deeper review.”
Technical details
Endpoint
POSThttps://creator.halowerk.com/v1/plagiarism-musicWhen to prefer
Choose this endpoint when you need a fast, deterministic, purely melodic interval-pattern comparison between two MIDI note sequences expressed as pitch integers. It is ideal for pre-screening melodies for interval similarity before deeper legal or harmonic analysis, or for building melody-matching pipelines. Do not use it for rhythm analysis, harmonic analysis, audio recordings, timbre comparison, or legal determinations of plagiarism — it only measures pitch interval n-gram overlap.
Side effects
- Fewer than 3 MIDI notes provided for either sequence — minimum input size not met
- MIDI note values outside 0–127 range — validation error
- n-gram size exceeds 8 or is less than 1 — parameter out of bounds
- Either sequence has more than 2000 notes — exceeds maximum item count
- Payment not included or insufficient — x402 payment required error
- Empty array or missing required field — request body validation failure
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| interval_ngram_size | integer | |
| candidate_midi_notes | array | |
| reference_midi_notes | array |
Tags
x402
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