Syllable count, hyphenation & reading time API

Count syllables per word using a dictionary of known irregulars layered over a vowel-group heuristic (silent-e, diphthongs, consonant+le), produce hyphenation break points, and derive reading (200 wpm) and speaking (130 wpm) time for the whole text. Dictionary-corrected, not a raw vowel count. Answers 'how many syllables in this', 'hyphenate these words', 'reading time of this text', 'syllables per word average'.

Price$0.01per request

MethodPOST

Route/v1/text/syllables

StatusLive

MIME typeapplication/json

Rate limit60/minute

CacheNo cache

textsyllableshyphenationreading-timephoneticssyllabifynlplinguistics

API URLhttps://x402.hexl.dev/v1/text/syllables

Integration docs

Example request

{
  "text": "hello wonderful world"
}

Example response

{
  "text": "hello wonderful world",
  "wordCount": 3,
  "totalSyllables": 6,
  "avgSyllablesPerWord": 2,
  "readingTimeSeconds": 0.9,
  "speakingTimeSeconds": 1.38,
  "words": [
    {
      "word": "hello",
      "syllables": 2,
      "hyphenation": "hell-o"
    },
    {
      "word": "wonderful",
      "syllables": 3,
      "hyphenation": "wond-erf-ul"
    },
    {
      "word": "world",
      "syllables": 1,
      "hyphenation": "world"
    }
  ]
}

Input schema

{
  "type": "object",
  "required": [
    "text"
  ],
  "properties": {
    "text": {
      "type": "string",
      "examples": [
        "hello wonderful world"
      ]
    }
  }
}

Output schema

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