Number Base Converter API Reference

Overview

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.

Endpoint

One host, one path per API. The block below shows this call in four languages; every one of them is the same HTTP request. Making requests covers the timeouts, retries and parameter rules that apply to all of them. The SDKs wrap the same call in a typed client.

GEThttps://api.apiverve.com/v1/numberbaseconverter

curl "https://api.apiverve.com/v1/numberbaseconverter?value=255&from=10&to=10" \
  -H "x-api-key: your_api_key_here"

const res = await fetch('https://api.apiverve.com/v1/numberbaseconverter?value=255&from=10&to=10', {
  headers: { 'x-api-key': 'your_api_key_here' },
});

if (!res.ok) throw new Error(`${res.status} ${await res.text()}`);

const { data } = await res.json();
console.log(data);

import requests

res = requests.get(
    "https://api.apiverve.com/v1/numberbaseconverter?value=255&from=10&to=10",
    headers={"x-api-key": "your_api_key_here"},
    timeout=15,
)
res.raise_for_status()

print(res.json()["data"])

package main

import (
	"fmt"
	"io"
	"net/http"
)

func main() {
	req, _ := http.NewRequest("GET", "https://api.apiverve.com/v1/numberbaseconverter?value=255&from=10&to=10", nil)
	req.Header.Set("x-api-key", "your_api_key_here")

	res, err := http.DefaultClient.Do(req)
	if err != nil {
		panic(err)
	}
	defer res.Body.Close()

	out, _ := io.ReadAll(res.Body)
	fmt.Println(string(out))
}

Replace your_api_key_here with the key from your dashboard. When the inputs arrive as a list rather than one at a time, batch requests run up to 200 of them through this same API in a single call.

Authentication

Send your key in the x-api-key header. That is the only auth step — there is no token exchange and no per-endpoint scope to configure. Authentication covers creating, rotating and revoking keys.

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.

Parameters

Sent in the query string. Premium parameters are accepted on every plan but only take effect on plans that include them.

Parameter	Type	Description
`value`Required	string	The number to convert
`from`Optional	integer	Source base (default: 10) default 10 · range 2–36
`to`Optional	integer	Target base (returns all common bases if not specified) range 2–36

Response

Every API returns the same three top-level keys, so one response handler covers your whole integration: status, error and data. Only data changes shape. Response format covers the envelope, the other output formats and how premium fields are withheld.

Sample response

{
  "status": "ok",
  "error": null,
  "data": {
    "input_value": "FF",
    "input_base": 16,
    "input_base_name": "hexadecimal",
    "decimal_value": 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)
`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

Errors

Read the HTTP status first, then error for the specific reason. The body names the parameter that has to change. Error handling covers the full status list and which of them are worth retrying.

Status	Meaning	What to do
`400`	Input was rejected	Read `error`; it names the parameter.
`401`	Key missing or invalid	Check the header name and the key value.
`403`	Key valid, but not permitted	A key restriction or IP allow-list; see key scoping.
`429`	Rate limited, or out of credits	Read `error` to tell them apart; see rate limits.

Use cases

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

Other ways to use Number Base Converter

Set up Number Base Converter on APIVerve, or reach the same source a different way. Your APIVerve account and credits work on all of them — one key, one balance.

Give it to an AI agentConnect over MCP and your agent calls it as a native tool — Claude, Cursor, ChatGPT.VerveKit →Reference →

Use it in Google Sheets or ExcelA =VERVE() formula fills a column — no script, no export, recalculates in place.VerveSheets →Reference →

Ground an agent on itA cited, machine-checkable fact your model can't produce on its own.VerveContext →Reference →

Number Base Converter