Bicycle Gearing & Fit Calc
Gear inches and speed at a cadence for every chainring and cog in a drivetrain, with the range, steps and duplicate gears.
OtherLiveeip155:8453Exactvia cdp
CyclingCassetteGearingDrivetrain
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 20:27Z
—
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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"accepts": [
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"payTo": "0xb531320805C5BED1D46AEaDcF4F008FDF172DBDa",
"scheme": "exact",
"network": "base",
"mimeType": "application/json",
"resource": "https://bike-calc.x402tookit.com/gear-table",
"description": "Gear inches and speed at a cadence for every chainring and cog in a drivetrain, with the range, steps and duplicate gears.",
"outputSchema": {
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"queryParams": {
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"chainrings": "50,34"
}
},
"output": {
"asOf": "2026-10-12T01:50:57.447Z",
"source": "computed locally (ratio x circumference)",
"reasons": [
"Gears are sorted by ratio; steps are the percentage jump from one gear to the next higher one."
],
"summary": "20 combinations from 32 (34/28) to 119.9 gear inches (50/11); range 374%.",
"verdict": "COMPUTED",
"degraded": false,
"cadenceRpm": 90,
"disclaimer": "Screening signal computed from the named public source. Not financial, legal or investment advice; provided as is. Verify at the source before acting.",
"lowestGear": {
"cog": 28,
"ratio": 1.214,
"speedKmh": 13.8,
"chainring": 34,
"gearInches": 32
},
"notChecked": [
"cross-chaining (big-big and small-small combinations that wear the chain)",
"front and rear derailleur capacity",
"…1 more"
],
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"ratio": 4.545,
"speedKmh": 51.7,
"chainring": 50,
"gearInches": 119.9
},
"combinations": 20,
"rangePercent": 374.4,
"sortedByRatio": [
{
"cog": 28,
"ratio": 1.214,
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}
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"circumferenceMm": 2105,
"averageStepPercent": 7.27,
"largestStepPercent": 16.7,
"nearDuplicateGears": 0
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"description": "Gear inches and speed at a cadence for every chainring and cog in a drivetrain, with the range, steps and duplicate gears.",
"outputSchema": {
"input": {
"type": "http",
"method": "GET",
"queryParams": {
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"chainrings": "50,34"
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},
"output": {
"asOf": "2026-10-12T01:50:57.447Z",
"source": "computed locally (ratio x circumference)",
"reasons": [
"Gears are sorted by ratio; steps are the percentage jump from one gear to the next higher one."
],
"summary": "20 combinations from 32 (34/28) to 119.9 gear inches (50/11); range 374%.",
"verdict": "COMPUTED",
"degraded": false,
"cadenceRpm": 90,
"disclaimer": "Screening signal computed from the named public source. Not financial, legal or investment advice; provided as is. Verify at the source before acting.",
"lowestGear": {
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"speedKmh": 13.8,
"chainring": 34,
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{
"cog": 24,
"ratio": 1.417,
"speedKmh": 16.1,
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}
],
"circumferenceMm": 2105,
"averageStepPercent": 7.27,
"largestStepPercent": 16.7,
"nearDuplicateGears": 0
}
},
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{
"asset": "0x3c499c542cEF5E3811e1192ce70d8cC03d5c3359",
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"payTo": "0xb531320805C5BED1D46AEaDcF4F008FDF172DBDa",
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"mimeType": "application/json",
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"description": "Gear inches and speed at a cadence for every chainring and cog in a drivetrain, with the range, steps and duplicate gears.",
"outputSchema": {
"input": {
"type": "http",
"method": "GET",
"queryParams": {
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"chainrings": "50,34"
}
},
"output": {
"asOf": "2026-10-12T01:50:57.447Z",
"source": "computed locally (ratio x circumference)",
"reasons": [
"Gears are sorted by ratio; steps are the percentage jump from one gear to the next higher one."
],
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"verdict": "COMPUTED",
"degraded": false,
"cadenceRpm": 90,
"disclaimer": "Screening signal computed from the named public source. Not financial, legal or investment advice; provided as is. Verify at the source before acting.",
"lowestGear": {
"cog": 28,
"ratio": 1.214,
"speedKmh": 13.8,
"chainring": 34,
"gearInches": 32
},
"notChecked": [
"cross-chaining (big-big and small-small combinations that wear the chain)",
"front and rear derailleur capacity",
"…1 more"
],
"highestGear": {
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"ratio": 4.545,
"speedKmh": 51.7,
"chainring": 50,
"gearInches": 119.9
},
"combinations": 20,
"rangePercent": 374.4,
"sortedByRatio": [
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"cog": 28,
"ratio": 1.214,
"speedKmh": 13.8,
"chainring": 34,
"gearInches": 32
},
{
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"ratio": 1.417,
"speedKmh": 16.1,
"chainring": 34,
"gearInches": 37.4
}
],
"circumferenceMm": 2105,
"averageStepPercent": 7.27,
"largestStepPercent": 16.7,
"nearDuplicateGears": 0
}
},
"maxAmountRequired": "20000",
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],
"x402Version": 1,
"alsoAvailable": {
"llms": "https://bike-calc.x402tookit.com/llms.txt",
"catalog": "https://bike-calc.x402tookit.com/catalog",
"message": "Bicycle Gearing & Fit Calc has 8 pay-per-call endpoints (Gear ratios and speed, cadence, gear tables, chain length, wheel circumference, climb grades, saddle height and frame size.), from $0.02 a call. See the full menu and send your agents our way.",
"openapi": "https://bike-calc.x402tookit.com/openapi.json",
"related": [
{
"url": "https://bike-calc.x402tookit.com/cadence-for-speed",
"path": "/cadence-for-speed",
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"price": "$0.02"
},
{
"url": "https://bike-calc.x402tookit.com/chain-length",
"path": "/chain-length",
"what": "Chain length in links, rounded up to even, from chainstay length and chainring and cog te…",
"price": "$0.02"
},
{
"url": "https://bike-calc.x402tookit.com/gear-ratio",
"path": "/gear-ratio",
"what": "Gear ratio, gear inches, development per pedal turn and speed at a cadence for a chainrin…",
"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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},
"payTo": "DUPiupXtuox38dcGoXUKer5mAydCzmaHjrbQ66qeEm8s",
"amount": "20000",
"scheme": "exact",
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{
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"payTo": "0xb531320805C5BED1D46AEaDcF4F008FDF172DBDa",
"amount": "20000",
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{
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"amount": "20000",
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"network": "eip155:42161",
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]Extensions
{
"bazaar": {
"info": {
"input": {
"type": "http",
"method": "GET",
"queryParams": {
"cogs": "11,12,13,14,15,17,19,21,24,28",
"chainrings": "50,34"
}
},
"output": {
"type": "json",
"example": {
"asOf": "2026-10-12T01:50:57.447Z",
"source": "computed locally (ratio x circumference)",
"reasons": [
"Gears are sorted by ratio; steps are the percentage jump from one gear to the next higher one."
],
"summary": "20 combinations from 32 (34/28) to 119.9 gear inches (50/11); range 374%.",
"verdict": "COMPUTED",
"degraded": false,
"cadenceRpm": 90,
"disclaimer": "Screening signal computed from the named public source. Not financial, legal or investment advice; provided as is. Verify at the source before acting.",
"lowestGear": {
"cog": 28,
"ratio": 1.214,
"speedKmh": 13.8,
"chainring": 34,
"gearInches": 32
},
"notChecked": [
"cross-chaining (big-big and small-small combinations that wear the chain)",
"front and rear derailleur capacity",
"…1 more"
],
"highestGear": {
"cog": 11,
"ratio": 4.545,
"speedKmh": 51.7,
"chainring": 50,
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},
"combinations": 20,
"rangePercent": 374.4,
"sortedByRatio": [
{
"cog": 28,
"ratio": 1.214,
"speedKmh": 13.8,
"chainring": 34,
"gearInches": 32
},
{
"cog": 24,
"ratio": 1.417,
"speedKmh": 16.1,
"chainring": 34,
"gearInches": 37.4
}
],
"circumferenceMm": 2105,
"averageStepPercent": 7.27,
"largestStepPercent": 16.7,
"nearDuplicateGears": 0
}
}
},
"schema": {
"type": "object",
"$schema": "https://json-schema.org/draft/2020-12/schema",
"required": [
"input"
],
"properties": {
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"type": "object",
"required": [
"type",
"method"
],
"properties": {
"type": {
"type": "string",
"const": "http"
},
"method": {
"enum": [
"GET"
],
"type": "string"
},
"queryParams": {
"type": "object",
"required": [
"chainrings",
"cogs"
],
"properties": {
"cogs": {
"type": "string",
"description": "Comma-separated cog teeth, for example 11,12,13,14,15,17,19,21,24,28"
},
"wheel": {
"type": "string",
"description": "Tyre preset: 700x23c, 700x25c, 700x28c, 700x32c, 700x35c, 700x38c, 26x2.0 (default 700x25c)"
},
"cadence": {
"type": "number",
"description": "Cadence in rpm for the speed column (default 90)"
},
"chainrings": {
"type": "string",
"description": "Comma-separated chainring teeth, for example 50,34"
},
"circumferenceMm": {
"type": "number",
"description": "Rolling circumference in mm instead of a preset"
}
}
}
},
"additionalProperties": false
},
"output": {
"type": "object",
"required": [
"type"
],
"properties": {
"type": {
"type": "string"
},
"example": {
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"properties": {
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"verdict": {
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"degraded": {
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},
"cadenceRpm": {
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"number"
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},
"disclaimer": {
"type": [
"null",
"string"
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},
"lowestGear": {
"type": [
"null",
"object"
],
"properties": {
"cog": {
"type": [
"null",
"number"
]
},
"ratio": {
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"null",
"number"
]
},
"speedKmh": {
"type": [
"null",
"number"
]
},
"chainring": {
"type": [
"null",
"number"
]
},
"gearInches": {
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"null",
"number"
]
}
}
},
"notChecked": {
"type": [
"array",
"null"
],
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}
},
"highestGear": {
"type": [
"null",
"object"
],
"properties": {
"cog": {
"type": [
"null",
"number"
]
},
"ratio": {
"type": [
"null",
"number"
]
},
"speedKmh": {
"type": [
"null",
"number"
]
},
"chainring": {
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"null",
"number"
]
},
"gearInches": {
"type": [
"null",
"number"
]
}
}
},
"combinations": {
"type": [
"null",
"number"
]
},
"rangePercent": {
"type": [
"null",
"number"
]
},
"sortedByRatio": {
"type": [
"array",
"null"
],
"items": {
"type": "object",
"properties": {
"cog": {
"type": [
"null",
"number"
]
},
"ratio": {
"type": [
"null",
"number"
]
},
"speedKmh": {
"type": [
"null",
"number"
]
},
"chainring": {
"type": [
"null",
"number"
]
},
"gearInches": {
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"null",
"number"
]
}
}
}
},
"circumferenceMm": {
"type": [
"null",
"number"
]
},
"averageStepPercent": {
"type": [
"null",
"number"
]
},
"largestStepPercent": {
"type": [
"null",
"number"
]
},
"nearDuplicateGears": {
"type": [
"null",
"number"
]
}
}
}
}
}
}
}
}
}Provenance
- Seen in the source catalog
- 2026-10-20 20:27Z
- Last indexed by Roundhouse
- 2026-10-22 19:30Z
- Last enriched (probe, favicon, geo)
- 2026-10-20 21:15Z
- 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 Bicycle Gearing & Fit Calc 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=Bicycle%20Gearing%20%26%20Fit%20Calc' 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://bike-calc.x402tookit.com/gear-table, 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.