Tap intervals to BPM API

Derives BPM from tap intervals (or timestamps) by averaging gaps, and reports the standard deviation, steadiness and a confidence rating — a tap-tempo detector with a stability read-out. Answers 'What BPM is a 500 ms tap?', 'How steady is my tapping?'.

Price$0.04per request

MethodPOST

Route/v1/music/tap-tempo

StatusLive

MIME typeapplication/json

Rate limit120/minute

Cache0s public

musictap-tempobpmtempobeat-detectiontimingrhythmaudioproduction

API URLhttps://x402.hexl.dev/v1/music/tap-tempo

Integration docs

Example request

{
  "intervalsMs": [
    500,
    500,
    500
  ]
}

Example response

{
  "tapCount": 4,
  "intervalCount": 3,
  "meanIntervalMs": 500,
  "bpm": 120,
  "bpmRounded": 120,
  "stdDevMs": 0,
  "steadiness": 1,
  "confidence": "high"
}

Input schema

{
  "type": "object",
  "properties": {
    "intervalsMs": {
      "type": "array",
      "items": {
        "type": "number"
      },
      "examples": [
        [
          500,
          500,
          500
        ]
      ]
    },
    "timestampsMs": {
      "type": "array",
      "items": {
        "type": "number"
      },
      "examples": [
        [
          0,
          500,
          1000,
          1500
        ]
      ]
    }
  }
}

Output schema

{
  "type": "object",
  "additionalProperties": true
}