Fitness and Body Calculators
Running pace per km and per mile, speed, and predicted times for other race distances using the Riegel formula.
OtherLiveeip155:8453Exactvia cdp
RunningPaceRaceRiegel
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.
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"description": "Running pace per km and per mile, speed, and predicted times for other race distances using the Riegel formula.",
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"asOf": "2026-10-11T08:36:51.391Z",
"time": "25:00",
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"formula": "Riegel exponent 1.06",
"reasons": [
"Riegel: T2 = T1 x (D2 / D1)^1.06. It is a rule of thumb: marathon predictions from a 5k are optimistic without marathon training."
],
"summary": "5 km in 25:00: 5:00 per km, 8:03 per mile, 12 km/h. Predicted: 1500m 6:59, mile 7:31, 3k 14:33, 10k 52:07, half 1:55:00.",
"verdict": "COMPUTED",
"degraded": false,
"speedKmh": 12,
"speedMph": 7.45645,
"pacePerKm": "5:00",
"disclaimer": "Screening signal computed from the named public source. Not financial, legal or investment advice; provided as is. Verify at the source before acting.",
"distanceKm": 5,
"notChecked": [
"course, weather and training: Riegel assumes you are trained for the longer distance and over-predicts fast marathon times for low-mileage runners",
"predictions below about 1 mile or above the marathon",
"…1 more"
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"pacePerMile": "8:03",
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"10k": "52:07",
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"verdict": "COMPUTED",
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"disclaimer": "Screening signal computed from the named public source. Not financial, legal or investment advice; provided as is. Verify at the source before acting.",
"distanceKm": 5,
"notChecked": [
"course, weather and training: Riegel assumes you are trained for the longer distance and over-predicts fast marathon times for low-mileage runners",
"predictions below about 1 mile or above the marathon",
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"pacePerMile": "8:03",
"predictions": {
"3k": "14:33",
"10k": "52:07",
"half": "1:55:00",
"mile": "7:31",
"1500m": "6:59",
"marathon": "3:59:47"
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"method": "GET",
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"summary": "5 km in 25:00: 5:00 per km, 8:03 per mile, 12 km/h. Predicted: 1500m 6:59, mile 7:31, 3k 14:33, 10k 52:07, half 1:55:00.",
"verdict": "COMPUTED",
"degraded": false,
"speedKmh": 12,
"speedMph": 7.45645,
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"disclaimer": "Screening signal computed from the named public source. Not financial, legal or investment advice; provided as is. Verify at the source before acting.",
"distanceKm": 5,
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"course, weather and training: Riegel assumes you are trained for the longer distance and over-predicts fast marathon times for low-mileage runners",
"predictions below about 1 mile or above the marathon",
"…1 more"
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"pacePerMile": "8:03",
"predictions": {
"3k": "14:33",
"10k": "52:07",
"half": "1:55:00",
"mile": "7:31",
"1500m": "6:59",
"marathon": "3:59:47"
},
"timeSeconds": 1500,
"distanceMiles": 3.106856
}
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"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/heart-rate-zones",
"path": "/heart-rate-zones",
"what": "Estimated maximum heart rate (Tanaka, Fox) and five training zones as percent of max or b…",
"price": "$0.02"
},
{
"url": "https://fitness-calc.x402tookit.com/bmi",
"path": "/bmi",
"what": "Body mass index from weight and height, metric or imperial, with the WHO adult category a…",
"price": "$0.02"
},
{
"url": "https://fitness-calc.x402tookit.com/bmr-tdee",
"path": "/bmr-tdee",
"what": "Basal metabolic rate (Mifflin-St Jeor), daily calories by activity level, and a calorie t…",
"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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{
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"output": {
"type": "json",
"example": {
"asOf": "2026-10-11T08:36:51.391Z",
"time": "25:00",
"source": "computed locally",
"formula": "Riegel exponent 1.06",
"reasons": [
"Riegel: T2 = T1 x (D2 / D1)^1.06. It is a rule of thumb: marathon predictions from a 5k are optimistic without marathon training."
],
"summary": "5 km in 25:00: 5:00 per km, 8:03 per mile, 12 km/h. Predicted: 1500m 6:59, mile 7:31, 3k 14:33, 10k 52:07, half 1:55:00.",
"verdict": "COMPUTED",
"degraded": false,
"speedKmh": 12,
"speedMph": 7.45645,
"pacePerKm": "5:00",
"disclaimer": "Screening signal computed from the named public source. Not financial, legal or investment advice; provided as is. Verify at the source before acting.",
"distanceKm": 5,
"notChecked": [
"course, weather and training: Riegel assumes you are trained for the longer distance and over-predicts fast marathon times for low-mileage runners",
"predictions below about 1 mile or above the marathon",
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"marathon": "3:59:47"
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}Provenance
- Seen in the source catalog
- 2026-10-20 20:46Z
- Last indexed by Roundhouse
- 2026-10-22 19:30Z
- 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/pace-race, 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.