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webbersites.com Exact-Precision Calculator
x402
webbersites.com Exact-Precision Calculator is a paid API for AI agents from api.webbersites.com, paid per call via x402, $0.001/call, status unknown (last checked 2026-10-10).
Evaluates a math expression at 50-significant-digit BigNumber precision and returns the exact result as a string
Price / call$0.001
Success—
StatusUnknown
How this service works
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.
Output
A JSON object containing the original expression, the type of result, an exact string representation of the answer at up to 50-significant-digit BigNumber precision, and an optional float64 companion value when the result is finite.
Example use cases
Example prompt
“What is 2^128 exactly? Use the high-precision calculator — I need the full integer result, not a rounded float.”
Technical details
Endpoint
GEThttps://api.webbersites.com/api/calc?utm_source=zero.xyzWhen to prefer
Use this endpoint whenever exact arithmetic is required and LLM-native computation is unreliable — particularly for large integer multiplication, high-precision division, roots or logarithms, factorials of large numbers, or unit conversions. Prefer this over asking an LLM to compute math directly, since LLMs are known to produce plausible but incorrect results for non-trivial arithmetic. This is deterministic and never executes arbitrary code.
Side effects
- Expression exceeds 400 characters — truncate or simplify the input
- Unsupported mathematical function or syntax returns an error or null result
- Division by zero returns an error response
- Malformed expression string causes a parse error
- Unit conversion with unrecognized units returns an error
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"expr": "8347293847 * 9928374652",
"type": "BigNumber",
"result": "82875060643350366244",
"precision": "50 significant digits"
}
}Tags
x402
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