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Sindri Arithmetic Expression Evaluator
x402
Sindri Arithmetic Expression Evaluator is a paid API for AI agents from ppu43fkyhimq5fiqpmo42eh5ri0yypid.lambda-url.us-east-1.on.aws, paid per call via x402, $0.01/call, status unknown (last checked 2026-10-02).
Safely parses and evaluates arithmetic expressions with +, -, *, /, ^, and parentheses using a bounded-recursion parser without eval/Function, 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 result representing the evaluated value of the input arithmetic expression. The response contains the computed answer as a number, derived from safely parsing the expression using a bounded-recursion parser that respects standard operator precedence and parentheses.
Example use cases
Verify multi-step financial formula
“Can you evaluate this expression for me: (1250 * 12 + 450) / (1 - 0.25) — I need the exact number for a financial estimate, no guessing.”
Check homework arithmetic step
“My kid has this expression on their homework: (3^4 - 15) * (7 + 2) / 18 — can you calculate the exact answer?”
Validate formula output in data pipeline
“I need to confirm what (((88 + 12) * 3) - 40) / 5 evaluates to — please compute it precisely so I can cross-check the output of my spreadsheet.”
Technical details
Endpoint
POSThttps://ppu43fkyhimq5fiqpmo42eh5ri0yypid.lambda-url.us-east-1.on.aws/evaluateExpression?utm_source=zero.xyzWhen to prefer
Prefer this endpoint when you need reliable, exact arithmetic evaluation of an expression and cannot trust an LLM's native math — especially for long or nested expressions where order-of-operations mistakes are common. It is purpose-built to handle +, -, *, /, ^, and parentheses safely without using JavaScript eval or Function, making it suitable for agent pipelines requiring verifiable numeric output.
Side effects
- Expression exceeds 200 character limit — request rejected
- Malformed or invalid expression (e.g. missing operand, unmatched parentheses) — parse error returned
- Division by zero in expression — error or undefined result returned
- Non-arithmetic characters or unsupported functions in expression — parse error
- Payment not attached or insufficient USDC — 402 Payment Required response
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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