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Sindri Big Number Arithmetic
x402
Sindri Big Number Arithmetic 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 2026-10-19).
Performs arbitrary-precision integer arithmetic (add, subtract, multiply, power) on numbers with up to 1000 digits, passed as strings to avoid floating-point precision loss.
Price / call$0.01
Success—
StatusUnknown
How this service works
Arbitrary-precision integer arithmetic (add, subtract, multiply, power) beyond IEEE-754 float precision, using native BigInt. Operands are passed as digit strings so precision is never lost in transit. For power, the combined magnitude (base digit count x exponent) is capped at 50000 to bound response size, in addition to the per-operand digit cap and exponent cap.
Output
Returns the exact arbitrary-precision integer result of the requested arithmetic operation as a string of digits, preserving full precision with no IEEE-754 rounding errors.
Example use cases
Exact large number multiplication
“Multiply 123456789012345678901234567890 by 987654321098765432109876543210 and give me the exact answer — no floating point approximation.”
Big integer exponentiation
“What is 12345 to the power of 100? I need the full exact integer result, not scientific notation.”
High-precision subtraction for financial audit
“Subtract 99999999999999999999999999998 from 100000000000000000000000000000 and give me the precise difference.”
Technical details
Endpoint
POSThttps://ppu43fkyhimq5fiqpmo42eh5ri0yypid.lambda-url.us-east-1.on.aws/bigNumberArithmetic?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need exact integer arithmetic on numbers that exceed JavaScript's IEEE-754 double-precision limit (approximately 15–17 significant digits), such as cryptographic calculations, financial computations requiring perfect precision, combinatorics, or any scenario where even one digit of rounding error is unacceptable. Prefer this over standard calculator APIs whenever operands exceed 15 digits or you are computing large powers.
Side effects
- Operand exceeds 1000 digits — request rejected
- Exponent too large such that combined magnitude (base digits × exponent) exceeds 50000 — request rejected to bound response size
- Invalid operation enum value — validation error
- Non-numeric or malformed digit string input — parsing error
- Network timeout for extremely large power computations near the magnitude cap
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| a | string | First operand, as a string of digits (optionally negative). Max 1000 digits. |
| b | string | Second operand (or exponent for power), as a string of digits. Max 1000 digits (max 1000 for exponent on power). |
| operation | string | Operation to perform. |
Tags
x402
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