Number to Words API Reference

Overview

Number to Words works by converting numbers to words using a predefined set of rules. It supports a wide range of numbers and provides the equivalent words in a structured format.

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/numbertowords

curl "https://api.apiverve.com/v1/numbertowords?number=975.07" \
  -H "x-api-key: your_api_key_here"

const res = await fetch('https://api.apiverve.com/v1/numbertowords?number=975.07', {
  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/numbertowords?number=975.07",
    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/numbertowords?number=975.07", 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
`number`Required	number	The number to convert to words

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": {
    "number": 975.07,
    "words": "nine hundred seventy-five point zero seven",
    "ordinal": "nine hundred seventy-fifth point zero seven",
    "numberOfDigits_numeric": 3,
    "numberOfDigits_words": "three",
    "eachNumber": [
      "nine",
      "seven",
      "five"
    ],
    "afterDecimal": {
      "number": "07",
      "words": [
        "zero",
        "seven"
      ],
      "numberOfDigits_numeric": 2,
      "numberOfDigits_words": "two"
    },
    "locale": "en-US"
  }
}

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
`number`	number	`975.07`	The original number provided for conversion
`words`	string	`"nine hundred seventy-five point zero seven"`	The cardinal word representation of the number
`ordinal`Premium	string	`"nine hundred seventy-fifth point zero seven"`	The ordinal word representation of the number
`numberOfDigits_numeric`	number	`3`	Count of digits before the decimal point
`numberOfDigits_words`Premium	string	`"three"`	The digit count expressed as words
`eachNumber`Premium	array	`[nine, ...]`	Array containing each individual digit as words
`afterDecimal`	object	`{...}`
`number`	string	`"07"`	Decimal portion of the number as string
`words`Premium	array	`[zero, ...]`	Decimal digits represented as individual words
`numberOfDigits_numeric`	number	`2`	Count of digits after the decimal point
`numberOfDigits_words`Premium	string	`"two"`	Decimal digit count expressed as words
`locale`	string	`"en-US"`	Language locale code for the conversion

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

Financial Applications: Use the Number to Words API to convert numbers to words in financial applications. Use the data to generate invoices, checks, and receipts
Educational Tools: Develop educational tools by using the Number to Words API to convert numbers to words. Use the data to teach students about number systems and language
Document Processing: Process documents by using the Number to Words API to convert numbers to words. Use the data to automate data entry and improve accuracy in reports and forms
Game Development: Develop games by using the Number to Words API to convert numbers to words. Use the data to create puzzles, challenges, and interactive activities

Other ways to use Number to Words

Set up Number to Words 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 to Words