Exact Math + Units + Stats
Exact computation LLMs cannot do reliably: evaluate arithmetic expressions (trig, logs, powers, factorials, constants), convert between 80+ units across 11 dimensions (length, mass, temperature, data, speed, energy, pressure...), and compute descriptive statistics (mean, median, stdev, percentiles) over up to 100k numbers. Deterministic, no hallucinated arithmetic.
SearchLiveeip155:8453Exactvia cdp
MathCalculatorUnitsStatisticsConversion
Settlements · 30d
59↓ 22%
No per-endpoint history for this service yet, so this is payments indexed to its PROVIDER's wallet over 30 days.
$2.52
Verified settled volume
915 settlements proven x402 by their on-chain EIP-3009 marker.
$0.0010
Listed price
As published in the catalog. Always read the live 402 before paying.
5
Calls · 30d
Upstream's own call count for this endpoint, not ours.
1
Unique payers · 30d
Last called 2026-07-07 16:34Z
—
Upstream on-chain volume
Reported by the source catalog.
Paid to
0xB86F95EF5FA904318Ea9Df3b59AdCe099b478fC4The 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-SIGNATURE header is required",
"accepts": [
{
"asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"extra": {
"name": "USD Coin",
"version": "2"
},
"payTo": "0xB86F95EF5FA904318Ea9Df3b59AdCe099b478fC4",
"amount": "1000",
"scheme": "exact",
"network": "eip155:8453",
"maxTimeoutSeconds": 60
}
],
"resource": {
"url": "https://keyronne.com/api/calc",
"tags": [
"math",
"calculator",
"units",
"statistics",
"conversion"
],
"mimeType": "application/json",
"description": "Exact computation LLMs cannot do reliably: evaluate arithmetic expressions (trig, logs, powers, factorials, constants), convert between 80+ units across 11 dimensions (length, mass, temperature, data, speed, energy, pressure...), and compute descriptive statistics (mean, median, stdev, percentiles) over up to 100k numbers. Deterministic, no hallucinated arithmetic. POST a JSON body like: {\"expression\":\"sqrt(2) * sin(pi/4) + 17^2\",\"convert\":{\"value\":100,\"from\":\"mph\",\"to\":\"kmh\"},\"stats\":[1,2,2,3,8]}",
"serviceName": "Exact Math + Units + Stats"
},
"extensions": {
"bazaar": {
"info": {
"input": {
"body": {
"stats": [
1,
2,
2,
3,
8
],
"convert": {
"to": "kmh",
"from": "mph",
"value": 100
},
"expression": "sqrt(2) * sin(pi/4) + 17^2"
},
"type": "http",
"method": "POST",
"bodyType": "json"
},
"output": {
"type": "json",
"example": {
"stats": {
"max": 8,
"min": 1,
"sum": 16,
"mean": 3.2,
"count": 5,
"stdev": 2.48,
"median": 2
},
"convert": {
"to": "kmh",
"from": "mph",
"value": 160.9344,
"dimension": "speed"
},
"expression": {
"input": "sqrt(2) * sin(pi/4) + 17^2",
"value": 290
}
}
}
},
"schema": {
"type": "object",
"$schema": "https://json-schema.org/draft/2020-12/schema",
"required": [
"input"
],
"properties": {
"input": {
"type": "object",
"properties": {
"body": {
"type": "object",
"properties": {
"stats": {
"type": "array",
"items": {
"type": "number"
},
"description": "Numbers to describe statistically (up to 100,000)."
},
"convert": {
"type": "object",
"properties": {
"to": {
"type": "string"
},
"from": {
"type": "string",
"description": "e.g. \"mph\", \"celsius\", \"GiB\", \"acre\""
},
"value": {
"type": "number"
}
}
},
"expression": {
"type": "string",
"description": "Math expression, e.g. \"sqrt(2)*sin(pi/4)\", \"fact(20) / 2^10\"."
}
}
},
"type": {
"type": "string",
"const": "http"
},
"method": {
"enum": [
"POST"
],
"type": "string"
},
"bodyType": {
"enum": [
"json"
],
"type": "string"
}
}
},
"output": {
"type": "object",
"properties": {
"stats": {
"type": "object",
"properties": {
"max": {
"type": "number"
},
"min": {
"type": "number"
},
"p25": {
"type": "number"
},
"p75": {
"type": "number"
},
"p90": {
"type": "number"
},
"p99": {
"type": "number"
},
"sum": {
"type": "number"
},
"mean": {
"type": "number"
},
"count": {
"type": "integer"
},
"stdev": {
"type": "number"
},
"median": {
"type": "number"
},
"variance": {
"type": "number"
}
}
},
"convert": {
"type": "object",
"properties": {
"to": {
"type": "string"
},
"from": {
"type": "string"
},
"value": {
"type": "number"
},
"dimension": {
"type": "string"
}
}
},
"expression": {
"type": "object",
"properties": {
"input": {
"type": "string"
},
"value": {
"type": "number"
}
}
}
}
}
}
}
}
},
"x402Version": 2
}Accepts
The payment requirements as published to the catalog. Read the live 402 before paying — a price here is a claim, not a quote.
0.001USDC≈ $0.001 USD
on Base · exact scheme
Pay 0.001 USDC on Base to 0xB86F…78fC4. The signed payment is good for 1 minute.
- Paid to
- 0xB86F…78fC4
- USD Coin contract
- 0x8335…02913
- Payment window
- 1 minute
- As published
- 1000 smallest units
The catalog’s raw entry
[
{
"asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"extra": {
"name": "USD Coin",
"version": "2"
},
"payTo": "0xB86F95EF5FA904318Ea9Df3b59AdCe099b478fC4",
"amount": "1000",
"scheme": "exact",
"network": "eip155:8453",
"maxTimeoutSeconds": 60
}
]Extensions
{
"bazaar": {
"info": {
"input": {
"body": {
"stats": [
1,
2,
2,
3,
8
],
"convert": {
"to": "kmh",
"from": "mph",
"value": 100
},
"expression": "sqrt(2) * sin(pi/4) + 17^2"
},
"type": "http",
"method": "POST",
"bodyType": "json"
},
"output": {
"type": "json",
"example": {
"stats": {
"max": 8,
"min": 1,
"sum": 16,
"mean": 3.2,
"count": 5,
"stdev": 2.48,
"median": 2
},
"convert": {
"to": "kmh",
"from": "mph",
"value": 160.9344,
"dimension": "speed"
},
"expression": {
"input": "sqrt(2) * sin(pi/4) + 17^2",
"value": 290
}
}
}
},
"schema": {
"type": "object",
"$schema": "https://json-schema.org/draft/2020-12/schema",
"required": [
"input"
],
"properties": {
"input": {
"type": "object",
"properties": {
"body": {
"type": "object",
"properties": {
"stats": {
"type": "array",
"items": {
"type": "number"
},
"description": "Numbers to describe statistically (up to 100,000)."
},
"convert": {
"type": "object",
"properties": {
"to": {
"type": "string"
},
"from": {
"type": "string",
"description": "e.g. \"mph\", \"celsius\", \"GiB\", \"acre\""
},
"value": {
"type": "number"
}
}
},
"expression": {
"type": "string",
"description": "Math expression, e.g. \"sqrt(2)*sin(pi/4)\", \"fact(20) / 2^10\"."
}
}
},
"type": {
"type": "string",
"const": "http"
},
"method": {
"enum": [
"POST"
],
"type": "string"
},
"bodyType": {
"enum": [
"json"
],
"type": "string"
}
}
},
"output": {
"type": "object",
"properties": {
"stats": {
"type": "object",
"properties": {
"max": {
"type": "number"
},
"min": {
"type": "number"
},
"p25": {
"type": "number"
},
"p75": {
"type": "number"
},
"p90": {
"type": "number"
},
"p99": {
"type": "number"
},
"sum": {
"type": "number"
},
"mean": {
"type": "number"
},
"count": {
"type": "integer"
},
"stdev": {
"type": "number"
},
"median": {
"type": "number"
},
"variance": {
"type": "number"
}
}
},
"convert": {
"type": "object",
"properties": {
"to": {
"type": "string"
},
"from": {
"type": "string"
},
"value": {
"type": "number"
},
"dimension": {
"type": "string"
}
}
},
"expression": {
"type": "object",
"properties": {
"input": {
"type": "string"
},
"value": {
"type": "number"
}
}
}
}
}
}
}
}
}Provenance
- Seen in the source catalog
- 2026-07-07 16:34Z
- Last indexed by Roundhouse
- 2026-08-04 03:20Z
- Last enriched (probe, favicon, geo)
- 2026-09-14 00:15Z
- x402 version
- 2
- Max timeout
- 60s
- 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
No per-endpoint history for this service yet, so this is payments indexed to its PROVIDER's wallet over 30 days. Verified volume counts only settlements with an on-chain EIP-3009 marker.
Show the promptHide the prompt
Using Roundhouse, look up the x402 service Exact Math + Units + Stats 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=Exact%20Math%20%2B%20Units%20%2B%20Stats' 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://keyronne.com/api/calc, 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. Mint a personal key for $0.01 at GET https://api.roundhouseai.io/v0/test/x402, or use an organization key from https://roundhouseai.io/dashboard/team. If you do not have Roundhouse tools or skills installed, read https://roundhouseai.io/skill.md first — it is the whole procedure.