Daily protein requirement API

Compute daily protein need in grams from bodyweight and goal using evidence-based g/kg ranges (sedentary 0.8-1.0 … cutting 1.8-2.4). Answers 'how much protein do I need', 'protein for an 80kg lifter', 'grams of protein per day to build muscle', 'protein intake calculator'.

Price$0.01per request

MethodPOST

Route/v1/health/protein-need

StatusLive

MIME typeapplication/json

Rate limit120/minute

CacheNo cache

healthproteinnutritiondietmusclemacrosintakecalculator

API URLhttps://x402.hexl.dev/v1/health/protein-need

Integration docs

Example request

{
  "weightKg": 80,
  "goal": "strength"
}

Example response

{
  "proteinGramsPerDay": 152,
  "rangeG": {
    "min": 128,
    "max": 176
  },
  "gramsPerKg": {
    "min": 1.6,
    "max": 2.2
  },
  "goal": "strength",
  "formula": "proteinG = weightKg * gPerKg",
  "inputs": {
    "weightKg": 80
  }
}

Input schema

{
  "type": "object",
  "required": [
    "weightKg"
  ],
  "properties": {
    "weightKg": {
      "type": "number",
      "examples": [
        80
      ]
    },
    "goal": {
      "type": "string",
      "enum": [
        "sedentary",
        "active",
        "endurance",
        "strength",
        "cutting"
      ],
      "default": "active"
    }
  }
}

Output schema

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