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Sindri Arithmetic Expression Evaluator
x402
Sindri Arithmetic Expression Evaluator is a paid API for AI agents from x402.outpimp.com, paid per call via x402, $0.01/call, status unknown (last checked 2026-09-15).
Parses and evaluates arithmetic expressions (+, -, *, /, ^, parentheses) using a safe bounded-recursion parser with no eval or Function calls, avoiding LLM arithmetic errors.
Price / call$0.01
Success—
StatusUnknown
How this service works
Safe arithmetic expression evaluator. Parses and evaluates expressions with +, -, *, /, ^, and parentheses using a bounded-recursion parser (no eval/Function), avoiding the arithmetic slips an LLM makes on long expressions.
Output
A numeric value representing the evaluated result of the input arithmetic expression, computed deterministically via a safe recursive-descent parser without using JavaScript eval or Function constructors.
Example use cases
Verify complex formula result
“What is the result of ((142 * 37) + 589) / (2^8 - 12)? I need the exact number, not your best guess.”
Step-by-step budget arithmetic
“Can you work out (3500 - 1200 - 475 - 88.50) * 12 for me? That's my annual savings estimate after expenses.”
Exponent-heavy scientific calculation
“Compute (6.022 * 10^23) * (1.38 / 10^23) for me — I need the precise product.”
Technical details
Endpoint
POSThttps://x402.outpimp.com/evaluateExpressionWhen to prefer
Prefer this endpoint when you need a guaranteed-correct numeric answer to an arithmetic expression and cannot trust an LLM's own arithmetic (especially for long expressions, chained operations, or expressions with exponents). Ideal for agents that must compute precise financial, scientific, or logical values from formula strings without exposing themselves to code-injection risks of eval-based approaches.
Side effects
- Expression exceeds 200 character limit — returns an error
- Unsupported operators or non-arithmetic syntax (e.g. trig functions) — returns a parse error
- Division by zero — returns an error
- Malformed parentheses or invalid expression syntax — returns a parse error
- Payment not included or invalid — returns HTTP 402
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| expression | string | Arithmetic expression to evaluate, e.g. "(2 + 3) * 4". Max 200 characters. |
Tags
x402
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