Number Base Converter API

GET

Convert numbers between binary, hex, and any base up to 36.

Number Base Converter converts numbers between any base from 2 to 36, including binary, octal, decimal, and hexadecimal. Pass a value with optional source and target bases to receive the converted string, base names, and exact decimal values.

Try it — live request, no key required

Request

GETapi.apiverve.com/v1/numberbaseconverter?value=FF

Query parameters

valuestring

Verification

Format

No key required to try it. Get a key to use it in your app.

Example

{
  "status": "ok",
  "error": null,
  "data": {
    "input_value": "FF",
    "input_base": 16,
    "input_base_name": "hexadecimal",
    "decimal_value": 255,
    "decimal_value_exact": "255",
    "output_value": "255",
    "output_base": 10,
    "output_base_name": "decimal"
  }
}

About the Number Base Converter API

Number Base Converter works by parsing the input number in the source base, converting to decimal internally, then converting to the target base. Returns all common base conversions when no specific target is specified.

What people use it for

Programming: Convert between binary, octal, decimal, and hexadecimal for programming and debugging
Computer Science Education: Teach number systems and base conversion concepts in educational tools
Data Encoding: Convert between different number representations for data encoding and decoding
Network Analysis: Work with hexadecimal values in network protocols and packet analysis

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

View all integrations →

Other ways to use Number Base Converter

Same data, same APIVerve account, same credit balance — one key works on all of them.

Give it to an AI agentConnect over MCP and your agent calls it as a native tool — Claude, Cursor, ChatGPT.on VerveKit Google Sheets or ExcelA =VERVE() formula fills a column — no script, no export, recalculates in place.on VerveSheets Ground an agent on itA cited, machine-checkable fact your model can't produce on its own.on VerveContext

Questions.

Common questions about the Number Base Converter API.

Read the docs →

What range of bases does the converter support?

It supports any integer base from 2 through 36. Standard formats like binary, octal, decimal, and hexadecimal are fully supported alongside arbitrary custom bases within that range.

What happens if I omit the target base parameter?

The API returns conversions for all common bases at once. It provides the decimal equivalent and common representations simultaneously, eliminating the need to make multiple conversion requests.

Does the input number always have to be decimal?

No. You can specify any source base from 2 through 36 using the source parameter. If omitted, the source base defaults to decimal (base 10), but you can pass binary, hexadecimal, or any supported base string directly.

Can I convert values using bases higher than 36?

No. Number Base Converter restricts base values to the range of 2 through 36, utilizing digits 0 through 9 and alphabet characters. Bases outside this range are not supported.

What would 20,000 base conversions a month cost me?

At 2 credits per call, 20,000 conversions consume 40,000 credits, using one-fifth of the Starter plan's 200,000 credits. Starter covers up to 100,000 conversions monthly, which works out to about $0.30 per 1,000 calls. The Free plan provides 100 calls per month.

Request parameters — GET /v1/numberbaseconverter

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
`value`Required	string	`255`	The number to convert

Optional

Parameter	Type	Example	Description
`from`Optional	integer	`10`	Source base (default: 10) default 10 · range 2-36
`to`Optional	integer	`10`	Target base (returns all common bases if not specified) range 2-36

Example request

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curl "https://api.apiverve.com/v1/numberbaseconverter?value=FF&from=16&to=10" \
  -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-key`Required	Every request	Your API key. Header names are case-insensitive, so `X-API-Key` is the same header.
`Authorization`Alternate	Instead of the above	`Bearer <key>` — for clients that only expose bearer auth. Resolves to the same account and the same billing.

401 is the only auth verdict

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/numberbaseconverter

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.

Sample response

{
  "status": "ok",
  "error": null,
  "data": {
    "input_value": "FF",
    "input_base": 16,
    "input_base_name": "hexadecimal",
    "decimal_value": 255,
    "decimal_value_exact": "255",
    "output_value": "255",
    "output_base": 10,
    "output_base_name": "decimal"
  }
}

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
`input_value`	string	`"FF"`	Original input value
`input_base`	number	`16`	Source base used for conversion
`input_base_name`	string	`"hexadecimal"`	Name of the input base, such as binary or hexadecimal
`decimal_value`	number	`255`	Value in decimal (base 10)
`decimal_value_exact`	string	`"255"`	The decimal value as an exact string. decimal_value is a number and cannot hold more than 15-16 significant digits; this field is exact for any input.
`output_value`	string	`"255"`	Converted value in target base
`output_base`	number	`10`	Base the value was converted to
`output_base_name`	string	`"decimal"`	Name of the output base

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	Number Base Converter 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.

Compare all pricing tiers →

Call it from cURL — GET /v1/numberbaseconverter

No SDK to install — this is a plain HTTPS call to /v1/numberbaseconverter with your key in the x-api-key header. Swap in a real key and it runs as-is.

cURL

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2

curl "https://api.apiverve.com/v1/numberbaseconverter" \
  -H "x-api-key: YOUR_API_KEY"

Resources

GitHubapiverve/numberbaseconverter-apiSource, issues and the examples this page is built from.ReferenceNumber Base Converter API docsEvery parameter, every response field, and the errors.ParametersWhat this call acceptsRequired and optional inputs, with example values.

Also published for

@apiverve/numberbaseconverternpm APIVerve.API.NumberBaseConverterNuGet

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/numberbaseconverter

Install the Node.js SDK, then call the Number Base Converter API with your key. The client wraps the same HTTPS request, so anything it returns is what the endpoint returns.

Install — npm

npm install @apiverve/numberbaseconverter

Node.js

const res = await fetch("https://api.apiverve.com/v1/numberbaseconverter", {
  headers: { "x-api-key": "YOUR_API_KEY" },
});
const { data } = await res.json();
console.log(data);

Resources

npm@apiverve/numberbaseconverterThe published Node.js client, versioned and signed.GitHubapiverve/numberbaseconverter-apiSource, issues and the examples this page is built from.ReferenceNumber Base Converter API docsEvery parameter, every response field, and the errors.ParametersWhat this call acceptsRequired and optional inputs, with example values.

Also published for

APIVerve.API.NumberBaseConverterNuGet

Only the languages APIVerve ships a client for are listed — the rest call the endpoint directly over HTTPS.

Call it from Python — GET /v1/numberbaseconverter

No SDK to install — this is a plain HTTPS call to /v1/numberbaseconverter with your key in the x-api-key header. Swap in a real key and it runs as-is.

Python

import requests

res = requests.get(
    "https://api.apiverve.com/v1/numberbaseconverter",
    headers={"x-api-key": "YOUR_API_KEY"},
)
print(res.json()["data"])

Resources

Also published for

@apiverve/numberbaseconverternpm APIVerve.API.NumberBaseConverterNuGet

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/numberbaseconverter

Install the C# / .NET SDK, then call the Number Base Converter API with your key. The client wraps the same HTTPS request, so anything it returns is what the endpoint returns.

Install — NuGet

dotnet add package APIVerve.API.NumberBaseConverter

C# / .NET

using var client = new HttpClient();
client.DefaultRequestHeaders.Add("x-api-key", "YOUR_API_KEY");

var json = await client.GetStringAsync("https://api.apiverve.com/v1/numberbaseconverter");
Console.WriteLine(json);

Resources

NuGetAPIVerve.API.NumberBaseConverterThe published C# / .NET client, versioned and signed.GitHubapiverve/numberbaseconverter-apiSource, issues and the examples this page is built from.ReferenceNumber Base Converter API docsEvery parameter, every response field, and the errors.ParametersWhat this call acceptsRequired and optional inputs, with example values.

Also published for

@apiverve/numberbaseconverternpm

Only the languages APIVerve ships a client for are listed — the rest call the endpoint directly over HTTPS.

Call it from Go — GET /v1/numberbaseconverter

No SDK to install — this is a plain HTTPS call to /v1/numberbaseconverter 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/numberbaseconverter", 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

@apiverve/numberbaseconverternpm APIVerve.API.NumberBaseConverterNuGet

Only the languages APIVerve ships a client for are listed — the rest call the endpoint directly over HTTPS.

Call it from PHP — GET /v1/numberbaseconverter

No SDK to install — this is a plain HTTPS call to /v1/numberbaseconverter with your key in the x-api-key header. Swap in a real key and it runs as-is.

PHP

$ch = curl_init("https://api.apiverve.com/v1/numberbaseconverter");
curl_setopt($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

@apiverve/numberbaseconverternpm APIVerve.API.NumberBaseConverterNuGet

Only the languages APIVerve ships a client for are listed — the rest call the endpoint directly over HTTPS.

Call it from Ruby — GET /v1/numberbaseconverter

No SDK to install — this is a plain HTTPS call to /v1/numberbaseconverter with your key in the x-api-key header. Swap in a real key and it runs as-is.

Ruby

require "net/http"

uri = URI("https://api.apiverve.com/v1/numberbaseconverter")
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.body

Resources

Also published for

@apiverve/numberbaseconverternpm APIVerve.API.NumberBaseConverterNuGet

Only the languages APIVerve ships a client for are listed — the rest call the endpoint directly over HTTPS.

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Number Base Converter API

Try it — live request, no key required

About the Number Base Converter API

What people use it for

Ways to call it

Other ways to use Number Base Converter

Questions.

Request parameters — GET /v1/numberbaseconverter

Required

Optional

Authentication

Response — GET /v1/numberbaseconverter

Response fields

Response headers

Errors

What a call costs — 2 credits per call

Call it from cURL — GET /v1/numberbaseconverter

Resources

Also published for

Call it from Node.js — GET /v1/numberbaseconverter

Resources

Also published for

Call it from Python — GET /v1/numberbaseconverter

Resources

Also published for

Call it from C# / .NET — GET /v1/numberbaseconverter

Resources

Also published for

Call it from Go — GET /v1/numberbaseconverter

Resources

Also published for

Call it from PHP — GET /v1/numberbaseconverter

Resources

Also published for

Call it from Ruby — GET /v1/numberbaseconverter

Resources

Also published for

Zero-code embed — one snippet, no backend

Changelog — Number Base Converter API

Data Conversion

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