Exact math for agents — the arithmetic LLMs get plausibly wrong
Exact math for agents — the arithmetic LLMs get plausibly wrong. Evaluates an expression at 50-significant-digit precision (BigNumber): big-integer multiplication, high-precision division, roots, logs, factorials, unit conversions (12 inch to cm). GET ?expr=…, result returned as an exact string. Deterministic, no AI, never executed as code.
Answeringour last check, 2026-09-24
1 of 1checks answered this week
268 msmedian answer time
$0.001listed price per call
$0.001price it asked us
Paid test badge: not yet. The checks above are free: we call the tool without paying and read the payment request it sends back. The Verified badge needs paid calls whose answers match the promised output, and nobody can buy a badge.
Endpoint
GET https://api.webbersites.com/api/calc
| Category | Code and developer |
|---|---|
| Provider host | api.webbersites.com |
| Networks | eip155:8453 |
| Payment schemes | exact |
| Self-reported calls, 30 days | 7 from 4 payers (the provider's figure, not ours) |
Our checks, last 30 days
| Day | Result | HTTP | Asked | Time |
|---|---|---|---|---|
| 2026-09-24 | valid payment request | 402 | $0.001 | 268 ms |
Example input (from the provider)
{
"method": "GET",
"queryParams": {
"expr": "8347293847 * 9928374652"
},
"type": "http"
}
Promised output schema (from the provider)
{
"$schema": "https://json-schema.org/draft/2020-12/schema",
"properties": {
"input": {
"additionalProperties": false,
"properties": {
"method": {
"enum": [
"GET"
],
"type": "string"
},
"queryParams": {
"properties": {
"expr": {
"description": "Math expression, max 400 chars \u2014 e.g. '2^128', 'sqrt(2)', '12 inch to cm'",
"type": "string"
}
},
"required": [
"expr"
],
"type": "object"
},
"type": {
"const": "http",
"type": "string"
}
},
"required": [
"type",
"method"
],
"type": "object"
},
"output": {
"properties": {
"example": {
"properties": {
"expr": {
"type": "string"
},
"result": {
"description": "exact result as a string",
"type": "string"
},
"result_number": {
"description": "float64 companion when finite",
"type": "number"
},
"type": {
"type": "string"
}
},
"type": "object"
},
"type": {
"type": "string"
}
},
"required": [
"type"
],
"type": "object"
}
},
"required": [
"input"
],
"type": "object"
}