Add, subtract, multiply, and divide Roman numerals directly.
Roman Numeral Math computes addition, subtraction, multiplication, and division between two Roman numerals. It returns the calculated result and complete equation in both Roman numeral and standard integer formats.
Try it — live request, no key required
No key required to try it. Get a key to use it in your app.
{
"status": "ok",
"error": null,
"data": {
"roman1": "XIV",
"roman2": "VI",
"roman1_value": 14,
"roman2_value": 6,
"operation": "add",
"result_number": 20,
"result_roman": "XX",
"equation_numeric": "14 + 6 = 20",
"equation_roman": "XIV + VI = XX"
}
}
About the Roman Numeral Math API
Roman Numeral Math works by converting Roman numerals to integers, performing the requested operation, then converting results back to Roman numerals. Validates inputs and handles edge cases like division by zero and out-of-range results.
What people use it for
- Educational Tools
- Teach Roman numeral arithmetic and ancient mathematics in interactive learning applications
- Historical Calculators
- Create calculators for historical contexts requiring Roman numeral operations
- Puzzle Games
- Build mathematical puzzles and games using Roman numeral arithmetic
- Format Conversion
- Perform calculations while maintaining Roman numeral formatting for specialized applications
Ways to call it
One endpoint, many ways in — REST with JSON, XML, YAML and CSV, plus GraphQL and an MCP interface for AI agents.
- JSON
- Default REST response
- XML
- Markup format
- YAML
- Human-readable
- CSV
- Tabular export
- GraphQL
- Query language
- MCP
- For AI agents
Other ways to use Roman Numeral Math
Same data, same APIVerve account, same credit balance — one key works on all of them.
Which arithmetic operations are supported?
Does the response include both Roman numerals and standard numbers?
Which plan fits 20,000 Roman numeral calculations a month?
How does the API handle division by zero or out-of-range results?
Does Roman Numeral Math validate inputs before performing math?
Request parameters — GET /v1/romannumeralmath
Sent in the query string. Premium parameters are accepted on every plan but only take effect on plans that include them. Anything not listed here is dropped rather than passed through.
Required
| Parameter | Type | Example | Description |
|---|---|---|---|
roman1Required | string | XIV | The first Roman numeral |
roman2Required | string | VI | The second Roman numeral |
Optional
| Parameter | Type | Example | Description |
|---|---|---|---|
operationOptional | string | add | Operation to performaddsubtractmultiplydividedefault add |
curl "https://api.apiverve.com/v1/romannumeralmath?roman1=XIV&roman2=VI&operation=add" \
-H "x-api-key: YOUR_API_KEY"Authentication
Send your key in the x-api-key header. That is the only auth step — no token exchange, and no per-endpoint scope to configure.
| Header | When | Value |
|---|---|---|
x-api-keyRequired | Every request | Your API key. Header names are case-insensitive, so X-API-Key is the same header. |
AuthorizationAlternate | Instead of the above | Bearer <key> — for clients that only expose bearer auth. Resolves to the same account and the same billing. |
A 401 means the key is missing, invalid or expired. A 403 means the key is valid but not permitted here — blocked by a key restriction or an IP allow-list. Running out of credits is a 429.
Response — GET /v1/romannumeralmath
Every APIVerve endpoint returns the same three top-level keys, so one response handler covers your whole integration: status, error and data. Only data changes shape.
{
"status": "ok",
"error": null,
"data": {
"roman1": "XIV",
"roman2": "VI",
"roman1_value": 14,
"roman2_value": 6,
"operation": "add",
"result_number": 20,
"result_roman": "XX",
"equation_numeric": "14 + 6 = 20",
"equation_roman": "XIV + VI = XX"
}
}
Response fields
Paths are relative to data. Premium fields are absent rather than zeroed on plans that do not include them, so check for presence instead of comparing to 0.
| Field | Type | Example | Description |
|---|---|---|---|
roman1 | string | "XIV" | First operand as it was supplied, in Roman numerals |
roman2 | string | "VI" | Second operand as it was supplied, in Roman numerals |
roman1_value | number | 14 | First operand converted to a number |
roman2_value | number | 6 | Second operand converted to a number |
operation | string | "add" | The arithmetic operation that was applied |
result_number | number | 20 | Result of the operation as a number |
result_roman | string | "XX" | Result of the operation in Roman numerals |
equation_numeric | string | "14 + 6 = 20" | Mathematical equation in numeric format |
equation_roman | string | "XIV + VI = XX" | Mathematical equation in Roman numeral format |
Response headers
Every response carries your balance, so your own code always knows where it stands without polling anything. All four are exposed to browsers through CORS.
| Header | What it carries |
|---|---|
x-api-remaining-credits | Credits left in the current cycle |
x-api-credits-used | Credits spent in the current cycle |
x-api-max-credits | The allowance for the cycle |
x-api-version | Version of the endpoint that answered |
Errors
Read the HTTP status first, then error for the specific reason. The body names the parameter that has to change.
| Status | Meaning | What to do |
|---|---|---|
400 | Input was rejected | Read error; it names the parameter that has to change. |
401 | Key missing or invalid | Check the header name and the key value. |
403 | Key valid, but not permitted here | A key restriction or an IP allow-list — never a bad key. |
429 | Rate limited, or out of credits | Read error to tell them apart, then back off or top up. |
What a call costs — 2 credits per call
Credits are shared across every APIVerve API — one balance, one key, one bill. Failed requests never count against it, so a rejected input costs nothing.
| Plan | Per month | Credits | Roman Numeral Math calls | Per 1,000 calls |
|---|---|---|---|---|
| Free | Free | 200 | 100 | Free |
| Starter | $29.99 | 200,000 | 100,000 | $0.30 |
| Pro | $99.99 | 1,000,000 | 500,000 | $0.20 |
| Mega | $299.99 | 4,000,000 | 2,000,000 | $0.15 |
Calls are what the credits buy at this API's rate — spend them here, on any of the other APIs, or across both. Nothing is reserved per endpoint.
Call it from cURL — GET /v1/romannumeralmath
No SDK to install — this is a plain HTTPS call to /v1/romannumeralmath with your key in the x-api-key header. Swap in a real key and it runs as-is.
curl "https://api.apiverve.com/v1/romannumeralmath" \
-H "x-api-key: YOUR_API_KEY"Resources
Also published for
Only the languages APIVerve ships a client for are listed — the rest call the endpoint directly over HTTPS.
Call it from Node.js — GET /v1/romannumeralmath
Install the Node.js SDK, then call the Roman Numeral Math API with your key. The client wraps the same HTTPS request, so anything it returns is what the endpoint returns.
npm install @apiverve/romannumeralmathconst res = await fetch("https://api.apiverve.com/v1/romannumeralmath", {
headers: { "x-api-key": "YOUR_API_KEY" },
});
const { data } = await res.json();
console.log(data);Resources
Also published for
Only the languages APIVerve ships a client for are listed — the rest call the endpoint directly over HTTPS.
Call it from Python — GET /v1/romannumeralmath
Install the Python SDK, then call the Roman Numeral Math API with your key. The client wraps the same HTTPS request, so anything it returns is what the endpoint returns.
pip install apiverve-romannumeralmathimport requests
res = requests.get(
"https://api.apiverve.com/v1/romannumeralmath",
headers={"x-api-key": "YOUR_API_KEY"},
)
print(res.json()["data"])Resources
Also published for
Only the languages APIVerve ships a client for are listed — the rest call the endpoint directly over HTTPS.
Call it from C# / .NET — GET /v1/romannumeralmath
Install the C# / .NET SDK, then call the Roman Numeral Math API with your key. The client wraps the same HTTPS request, so anything it returns is what the endpoint returns.
dotnet add package APIVerve.API.RomanNumeralMathusing var client = new HttpClient();
client.DefaultRequestHeaders.Add("x-api-key", "YOUR_API_KEY");
var json = await client.GetStringAsync("https://api.apiverve.com/v1/romannumeralmath");
Console.WriteLine(json);Resources
Also published for
Only the languages APIVerve ships a client for are listed — the rest call the endpoint directly over HTTPS.
Call it from Go — GET /v1/romannumeralmath
No SDK to install — this is a plain HTTPS call to /v1/romannumeralmath with your key in the x-api-key header. Swap in a real key and it runs as-is.
req, _ := http.NewRequest("GET", "https://api.apiverve.com/v1/romannumeralmath", nil)
req.Header.Set("x-api-key", "YOUR_API_KEY")
res, _ := http.DefaultClient.Do(req)
defer res.Body.Close()
body, _ := io.ReadAll(res.Body)
fmt.Println(string(body))Resources
Also published for
Only the languages APIVerve ships a client for are listed — the rest call the endpoint directly over HTTPS.
Call it from PHP — GET /v1/romannumeralmath
No SDK to install — this is a plain HTTPS call to /v1/romannumeralmath with your key in the x-api-key header. Swap in a real key and it runs as-is.
$ch = curl_init("https://api.apiverve.com/v1/romannumeralmath");
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
curl_setopt($ch, CURLOPT_HTTPHEADER, ["x-api-key: YOUR_API_KEY"]);
$response = curl_exec($ch);
echo $response;Resources
Also published for
Only the languages APIVerve ships a client for are listed — the rest call the endpoint directly over HTTPS.
Call it from Ruby — GET /v1/romannumeralmath
No SDK to install — this is a plain HTTPS call to /v1/romannumeralmath with your key in the x-api-key header. Swap in a real key and it runs as-is.
require "net/http"
uri = URI("https://api.apiverve.com/v1/romannumeralmath")
req = Net::HTTP::Get.new(uri)
req["x-api-key"] = "YOUR_API_KEY"
res = Net::HTTP.start(uri.hostname, uri.port, use_ssl: true) { |h| h.request(req) }
puts res.bodyResources
Also published for
Only the languages APIVerve ships a client for are listed — the rest call the endpoint directly over HTTPS.
Zero-code embed — one snippet, no backend
Drop an interactive Roman Numeral Math form onto any page. The widget calls the API for you, so no key ever appears in your markup and there is nothing to deploy.
Changelog — Roman Numeral Math API
Every change to this endpoint, newest first. Breaking changes ship as a new version and the previous one keeps serving — response fields are added, never removed or retyped in place, so an integration written against v1 keeps working.
Entries are picked up from dated catalog snapshots, so the first one appears after the next snapshot that moves something. A period where nothing changed produces no entry — silence is a valid changelog for the Roman Numeral Math API.
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