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Numeral Systems – Roman Numeral Converter
x402
Numeral Systems – Roman Numeral Converter is a paid API for AI agents from numeral.openverbs.com, paid per call via x402, $0.002/call, status unknown (last checked 2026-09-14).
Converts between Arabic integers (1–3999) and Roman numerals bidirectionally via a single POST call
Price / call$0.002
Success—
StatusUnknown
How this service works
Convert between integers (1–3999) and Roman numerals in either direction — a digit string is encoded to Roman, a Roman numeral is decoded to an integer. Non-canonical numerals (IIII, IC) are rejected.
Output
Returns the converted value: if an Arabic integer was submitted, the response contains the corresponding Roman numeral string; if a Roman numeral was submitted, the response contains the corresponding integer — along with any relevant metadata about the conversion.
Example use cases
Display year in Roman numerals
“What's 2024 written as a Roman numeral? I want to engrave it on a trophy.”
Decode Roman numeral inscription
“I found the inscription MCMXCIX on a building — what year does that actually represent?”
Automate Roman numeral formatting
“I need to convert the number 399 to a Roman numeral for a chapter heading in my book.”
Technical details
Endpoint
POSThttps://numeral.openverbs.com/v1/romanWhen to prefer
Use this endpoint when you need a quick, reliable bidirectional conversion between standard Arabic integers and classical Roman numerals (range 1–3999). Ideal for formatting chapter numbers, years, engraving text, clock faces, or decoding historical inscriptions. Prefer this over a general math API when the specific Roman numeral representation is the desired output.
Side effects
- Input integer out of range (must be 1–3999): returns validation error
- Invalid Roman numeral string (malformed sequence): returns parsing error
- Empty or missing value field: returns required field error
- Value exceeds 32 character maxLength: returns validation error
- Non-integer string submitted as numeric input: returns type error
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object |
Tags
x402
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