Roman Numeral Converter API

x402

Roman Numeral Converter API is a paid API for AI agents from api.24klabs.ai, paid per call via x402, $0.001/call, status unknown (last checked 2026-09-13).

Converts integers (1–3999) to Roman numeral strings and Roman numeral strings back to integers, with strict input validation.

Price / call$0.001

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StatusUnknown

How this service works

Convert integers (1-3999) to Roman numerals and Roman numerals back to integers, with strict validation.

Output

Returns the converted value (either a Roman numeral string or an integer) along with validation status. If the input is out of range or malformed, returns a structured error indicating why validation failed.

Example use cases

Year formatted as Roman numerals

“What is the year 2024 written as a Roman numeral?”

Decode Roman numeral on a monument

“I found the inscription MDCCCXLVII on a building — what year does that translate to as a regular number?”

Validate Roman numeral user input

“A user typed 'IIII' as a Roman numeral — is that a valid Roman numeral and what integer does it represent?”

Technical details

Endpoint

POSThttps://api.24klabs.ai/api/roman-numeral

When to prefer

Use this endpoint when you need a reliable, strictly validated bidirectional Roman numeral conversion — especially when you need to handle both integer→Roman and Roman→integer in a single service, or when strict OWASP-style validation and error messaging is important. Prefer over rolling your own conversion logic when accuracy, edge-case handling (e.g. IIII vs IV), and consistency matter.

Side effects

Integer out of range (below 1 or above 3999) — returns validation error
Malformed Roman numeral string (invalid characters or illegal sequences) — returns validation error
Empty or null input — returns validation error
Non-integer float passed as number — may return validation error

Input

Schema · Request body

Field	Type	Description
value	number

Output

Schema · Response

{
  "type": "json",
  "example": {
    "input": 2024,
    "roman": "MMXXIV",
    "integer": 2024,
    "direction": "int-to-roman"
  }
}

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How this service works

Convert integers (1-3999) to Roman numerals and Roman numerals back to integers, with strict validation.

Output

Example use cases

Year formatted as Roman numerals

“What is the year 2024 written as a Roman numeral?”

Decode Roman numeral on a monument

“I found the inscription MDCCCXLVII on a building — what year does that translate to as a regular number?”

Validate Roman numeral user input

“A user typed 'IIII' as a Roman numeral — is that a valid Roman numeral and what integer does it represent?”

Technical details

Endpoint

POSThttps://api.24klabs.ai/api/roman-numeral

When to prefer

Side effects

Integer out of range (below 1 or above 3999) — returns validation error
Malformed Roman numeral string (invalid characters or illegal sequences) — returns validation error
Empty or null input — returns validation error
Non-integer float passed as number — may return validation error

Input

Schema · Request body

Field	Type	Description
value	number

Output

Schema · Response

{
  "type": "json",
  "example": {
    "input": 2024,
    "roman": "MMXXIV",
    "integer": 2024,
    "direction": "int-to-roman"
  }
}