Fitness and Body Calculators
Basal metabolic rate (Mifflin-St Jeor), daily calories by activity level, and a calorie target for a weekly weight change.
OtherLiveeip155:8453Exactvia cdp
BmrTdeeCaloriesNutritionCalculator
Calls · 30d
1
This endpoint's own trailing-30-day call count, as published by the upstream catalog and snapshotted daily. 4 snapshots so far.
$24.31
Verified settled volume
1,175 settlements proven x402 by their on-chain EIP-3009 marker.
$0.020
Listed price
As published in the catalog. Always read the live 402 before paying.
1
Calls · 30d
Upstream's own call count for this endpoint, not ours.
1
Unique payers · 30d
Last called 2026-10-20 20:46Z
—
Upstream on-chain volume
Reported by the source catalog.
Paid to
0xb531320805C5BED1D46AEaDcF4F008FDF172DBDaThe wallet the 402 directs payment to. Its whole payment record — every payer, every chain — is on the merchant page.
Asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913
Provider
The payTo wallet does not resolve to a registered ERC-8004 agent. That is not a verdict on the service — most of the catalog is unregistered.
Live 402 challenge
Captured by the enrichment pass, not read just now. Prices can change — always read the 402 the endpoint answers with.
{
"error": "Payment required",
"accepts": [
{
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"extra": {
"name": "USD Coin",
"version": "2"
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"payTo": "0xb531320805C5BED1D46AEaDcF4F008FDF172DBDa",
"scheme": "exact",
"network": "base",
"mimeType": "application/json",
"resource": "https://fitness-calc.x402tookit.com/bmr-tdee",
"description": "Basal metabolic rate (Mifflin-St Jeor), daily calories by activity level, and a calorie target for a weekly weight change.",
"outputSchema": {
"input": {
"type": "http",
"method": "GET",
"queryParams": {
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"height": 180,
"weight": 80,
"activity": "moderate",
"weeklyChange": -0.5
}
},
"output": {
"asOf": "2026-10-11T08:36:49.299Z",
"inputs": {
"age": 30,
"sex": "male",
"heightCm": 180,
"weightKg": 80
},
"source": "computed locally",
"bmrKcal": 1780,
"reasons": [
"BMR = 10 x kg + 6.25 x cm - 5 x age + 5 (male) or - 161 (female). Activity multipliers: 1.2, 1.375, 1.55, 1.725, 1.9.",
"About 7,700 kcal is conventionally one kg of body fat; real weight change is slower and varies.",
"…1 more"
],
"summary": "BMR 1780 kcal/day; maintenance at moderate activity about 2759 kcal/day; for -0.5 kg per week, about 2209 kcal/day.",
"verdict": "COMPUTED",
"activity": "moderate",
"degraded": false,
"equation": "Mifflin-St Jeor (1990)",
"disclaimer": "Screening signal computed from the named public source. Not financial, legal or investment advice; provided as is. Verify at the source before acting.",
"notChecked": [
"individual metabolism: the equation is accurate to about 10% for most healthy adults and worse outside that group",
"lean mass (very muscular or very lean people burn more)",
"…2 more"
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"description": "Basal metabolic rate (Mifflin-St Jeor), daily calories by activity level, and a calorie target for a weekly weight change.",
"outputSchema": {
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"inputs": {
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"source": "computed locally",
"bmrKcal": 1780,
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"BMR = 10 x kg + 6.25 x cm - 5 x age + 5 (male) or - 161 (female). Activity multipliers: 1.2, 1.375, 1.55, 1.725, 1.9.",
"About 7,700 kcal is conventionally one kg of body fat; real weight change is slower and varies.",
"…1 more"
],
"summary": "BMR 1780 kcal/day; maintenance at moderate activity about 2759 kcal/day; for -0.5 kg per week, about 2209 kcal/day.",
"verdict": "COMPUTED",
"activity": "moderate",
"degraded": false,
"equation": "Mifflin-St Jeor (1990)",
"disclaimer": "Screening signal computed from the named public source. Not financial, legal or investment advice; provided as is. Verify at the source before acting.",
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"lean mass (very muscular or very lean people burn more)",
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"weeklyChangeKg": -0.5,
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{
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"extra": {
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"payTo": "0xb531320805C5BED1D46AEaDcF4F008FDF172DBDa",
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"method": "GET",
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"height": 180,
"weight": 80,
"activity": "moderate",
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},
"output": {
"asOf": "2026-10-11T08:36:49.299Z",
"inputs": {
"age": 30,
"sex": "male",
"heightCm": 180,
"weightKg": 80
},
"source": "computed locally",
"bmrKcal": 1780,
"reasons": [
"BMR = 10 x kg + 6.25 x cm - 5 x age + 5 (male) or - 161 (female). Activity multipliers: 1.2, 1.375, 1.55, 1.725, 1.9.",
"About 7,700 kcal is conventionally one kg of body fat; real weight change is slower and varies.",
"…1 more"
],
"summary": "BMR 1780 kcal/day; maintenance at moderate activity about 2759 kcal/day; for -0.5 kg per week, about 2209 kcal/day.",
"verdict": "COMPUTED",
"activity": "moderate",
"degraded": false,
"equation": "Mifflin-St Jeor (1990)",
"disclaimer": "Screening signal computed from the named public source. Not financial, legal or investment advice; provided as is. Verify at the source before acting.",
"notChecked": [
"individual metabolism: the equation is accurate to about 10% for most healthy adults and worse outside that group",
"lean mass (very muscular or very lean people burn more)",
"…2 more"
],
"targetKcal": 2209,
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"weeklyChangeKg": -0.5,
"maintenanceKcal": 2759,
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"active": 3071,
"moderate": 2759,
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},
"dailyDeficitOrSurplusKcal": -550
}
},
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],
"x402Version": 1,
"alsoAvailable": {
"llms": "https://fitness-calc.x402tookit.com/llms.txt",
"catalog": "https://fitness-calc.x402tookit.com/catalog",
"message": "Fitness and Body Calculators has 10 pay-per-call endpoints (BMI, ideal weight, calorie needs, macros, one-rep max, heart-rate zones, race pace and prediction, body fat, calorie burn, due date.), from $0.02 a call. See the full menu and send your agents our way.",
"openapi": "https://fitness-calc.x402tookit.com/openapi.json",
"related": [
{
"url": "https://fitness-calc.x402tookit.com/macro-split",
"path": "/macro-split",
"what": "Protein, carbohydrate and fat grams for a calorie target from a preset or your own percen…",
"price": "$0.02"
},
{
"url": "https://fitness-calc.x402tookit.com/calorie-burn",
"path": "/calorie-burn",
"what": "Calories burned by an activity (walking, running, cycling, swimming and more) from MET va…",
"price": "$0.02"
},
{
"url": "https://fitness-calc.x402tookit.com/body-fat-navy",
"path": "/body-fat-navy",
"what": "Body fat percentage estimate from tape measurements (US Navy method) with fat mass, lean…",
"price": "$0.02"
}
]
}
}Accepts
The payment requirements as published to the catalog. Read the live 402 before paying — a price here is a claim, not a quote.
0.02USDC≈ $0.02 USD
on Base · exact scheme
Pay 0.02 USDC on Base to 0xb531…2DBDa. The signed payment is good for 5 minutes.
- Paid to
- 0xb531…2DBDa
- USD Coin contract
- 0x8335…02913
- Payment window
- 5 minutes
- As published
- 20000 smallest units
20000units
on solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp · exact scheme
That figure is in the token’s smallest units. Roundhouse does not hold this contract’s decimals, so it is shown as published rather than converted.
- Paid to
- DUPiup…eEm8s
- Token contract
- EPjFWd…TDt1v
- Payment window
- 5 minutes
20000units
on Polygon · exact scheme
That figure is in the token’s smallest units. Roundhouse does not hold this contract’s decimals, so it is shown as published rather than converted.
- Paid to
- 0xb531…2DBDa
- Token contract
- 0x3c49…c3359
- Payment window
- 5 minutes
20000units
on Arbitrum · exact scheme
That figure is in the token’s smallest units. Roundhouse does not hold this contract’s decimals, so it is shown as published rather than converted.
- Paid to
- 0xb531…2DBDa
- Token contract
- 0xaf88…e5831
- Payment window
- 5 minutes
The catalog’s raw entry
[
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"payTo": "0xb531320805C5BED1D46AEaDcF4F008FDF172DBDa",
"amount": "20000",
"scheme": "exact",
"network": "eip155:8453",
"maxTimeoutSeconds": 300
},
{
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"extra": {
"feePayer": "D6ZhtNQ5nT9ZnTHUbqXZsTx5MH2rPFiBBggX4hY1WePM"
},
"payTo": "DUPiupXtuox38dcGoXUKer5mAydCzmaHjrbQ66qeEm8s",
"amount": "20000",
"scheme": "exact",
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{
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"payTo": "0xb531320805C5BED1D46AEaDcF4F008FDF172DBDa",
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{
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"amount": "20000",
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{
"bazaar": {
"info": {
"input": {
"type": "http",
"method": "GET",
"queryParams": {
"age": 30,
"sex": "male",
"height": 180,
"weight": 80,
"activity": "moderate",
"weeklyChange": -0.5
}
},
"output": {
"type": "json",
"example": {
"asOf": "2026-10-11T08:36:49.299Z",
"inputs": {
"age": 30,
"sex": "male",
"heightCm": 180,
"weightKg": 80
},
"source": "computed locally",
"bmrKcal": 1780,
"reasons": [
"BMR = 10 x kg + 6.25 x cm - 5 x age + 5 (male) or - 161 (female). Activity multipliers: 1.2, 1.375, 1.55, 1.725, 1.9.",
"About 7,700 kcal is conventionally one kg of body fat; real weight change is slower and varies.",
"…1 more"
],
"summary": "BMR 1780 kcal/day; maintenance at moderate activity about 2759 kcal/day; for -0.5 kg per week, about 2209 kcal/day.",
"verdict": "COMPUTED",
"activity": "moderate",
"degraded": false,
"equation": "Mifflin-St Jeor (1990)",
"disclaimer": "Screening signal computed from the named public source. Not financial, legal or investment advice; provided as is. Verify at the source before acting.",
"notChecked": [
"individual metabolism: the equation is accurate to about 10% for most healthy adults and worse outside that group",
"lean mass (very muscular or very lean people burn more)",
"…2 more"
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}
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},
"schema": {
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"$schema": "https://json-schema.org/draft/2020-12/schema",
"required": [
"input"
],
"properties": {
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"required": [
"type",
"method"
],
"properties": {
"type": {
"type": "string",
"const": "http"
},
"method": {
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"GET"
],
"type": "string"
},
"queryParams": {
"type": "object",
"required": [
"weight",
"sex",
"age"
],
"properties": {
"age": {
"type": "number",
"description": "Age in years, 15 to 100"
},
"sex": {
"type": "string",
"description": "male or female"
},
"units": {
"type": "string",
"description": "metric (default: kg and cm) or imperial (lb, feet and inches)"
},
"height": {
"type": "number",
"description": "Height in cm (metric)"
},
"weight": {
"type": "number",
"description": "Weight in kg, or pounds if units=imperial"
},
"activity": {
"type": "string",
"description": "sedentary, light, moderate (default), active or very-active"
},
"heightFt": {
"type": "number",
"description": "Feet (imperial)"
},
"heightIn": {
"type": "number",
"description": "Inches (imperial; total inches if heightFt is omitted)"
},
"weeklyChange": {
"type": "number",
"description": "Desired weight change in kg per week (negative to lose), -1 to 1; default 0"
}
}
}
},
"additionalProperties": false
},
"output": {
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"required": [
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],
"properties": {
"type": {
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},
"example": {
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"source": {
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"bmrKcal": {
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},
"reasons": {
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"verdict": {
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"activity": {
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"string"
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},
"degraded": {
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"null"
]
},
"equation": {
"type": [
"null",
"string"
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},
"disclaimer": {
"type": [
"null",
"string"
]
},
"notChecked": {
"type": [
"array",
"null"
],
"items": {
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},
"targetKcal": {
"type": [
"null",
"number"
]
},
"activityFactor": {
"type": [
"null",
"number"
]
},
"weeklyChangeKg": {
"type": [
"null",
"number"
]
},
"maintenanceKcal": {
"type": [
"null",
"number"
]
},
"commonMinimumKcal": {
"type": [
"null",
"number"
]
},
"belowCommonMinimum": {
"type": [
"boolean",
"null"
]
},
"maintenanceByActivity": {
"type": [
"null",
"object"
],
"properties": {
"light": {
"type": [
"null",
"number"
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},
"active": {
"type": [
"null",
"number"
]
},
"moderate": {
"type": [
"null",
"number"
]
},
"sedentary": {
"type": [
"null",
"number"
]
},
"very-active": {
"type": [
"null",
"number"
]
}
}
},
"dailyDeficitOrSurplusKcal": {
"type": [
"null",
"number"
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}
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}
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}
}
}
}
}Provenance
- Seen in the source catalog
- 2026-10-20 20:46Z
- Last indexed by Roundhouse
- 2026-10-22 06:50Z
- Last enriched (probe, favicon, geo)
- 2026-10-20 22:45Z
- x402 version
- 2
- Max timeout
- 300s
- Liveness probe
- HTTP 402
Hand this page to an agent
Copy the prompt and paste it into Claude, an MCP client or your own agent — it will vet this service and call it over the free read API. No key, no account.
GET api.roundhouseai.io/v0/endpoints
This endpoint's own trailing-30-day call count, as published by the upstream catalog and snapshotted daily. 4 snapshots so far. Verified volume counts only settlements with an on-chain EIP-3009 marker.
Show the promptHide the prompt
Using Roundhouse, look up the x402 service Fitness and Body Calculators and tell me whether it is worth paying: what a call costs, whether the endpoint answered when last probed, and what its payment record actually shows. curl -s 'https://api.roundhouseai.io/v0/endpoints?q=Fitness%20and%20Body%20Calculators' curl -s 'https://api.roundhouseai.io/v0/merchants/<the payTo wallet returned above>' Then call it: read the price from the live 402 at https://fitness-calc.x402tookit.com/bmr-tdee, never from a cached figure, and pay with an x402 client. The /v0 API needs an API key (`authorization: Bearer rh_live_…`) on everything except /v0/unified* and /v0/endpoints. Either pay over x402 (mint a personal key for $0.01 at GET https://api.roundhouseai.io/v0/test/x402), or ask me for an organization key, which I create at https://roundhouseai.io/dashboard/connections. If you have neither, ask before going further. If you do not have Roundhouse tools or skills installed, read https://roundhouseai.io/skill.md first — it is the whole procedure.