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Number to Words Converter (Cardinal, Ordinal, Currency)
x402
Number to Words Converter (Cardinal, Ordinal, Currency) is a paid API for AI agents from api.24klabs.ai, paid per call via x402, $0.002/call, status unknown (last checked 2026-09-13).
Converts a numeric value into its English word representation in cardinal, ordinal, or currency (dollars and cents) form for use in checks, invoices, and documents.
Price / call$0.002
Success—
StatusUnknown
How this service works
Spell a number in English words: cardinal, ordinal, or currency (dollars and cents) form for checks and invoices.
Output
Returns the English word representation of the input number in the requested form: cardinal (e.g. 'one thousand forty-two'), ordinal (e.g. 'forty-second'), or currency (e.g. 'one thousand forty-two dollars and fifty cents').
Example use cases
Check amount in words
“I need to write a check for $2,847.50 — can you spell out that dollar amount in English words the way it appears on a paper check?”
Invoice legal amount line
“Our invoice template needs the total of 10500 written out in full English words for the currency field — can you convert that for me?”
Ordinal number for ranking
“Write out the number 23 as an ordinal in English words, like you'd say it in a ceremony — 'twenty-third' or however it should read.”
Technical details
Endpoint
POSThttps://api.24klabs.ai/api/number-to-wordsWhen to prefer
Choose this endpoint when you need to programmatically spell out numbers in English for financial documents (checks, invoices), legal text, or user-facing content that requires written-out numbers. It handles cardinal, ordinal, and currency formats in a single call at low cost, making it ideal for document generation pipelines or form-filling agents.
Side effects
- Non-numeric input returns a validation error
- Unsupported mode/form parameter returns a bad request error
- Extremely large numbers may exceed supported range and return an error
- Missing required fields (number or mode) result in a 400 response
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| form | string | |
| number | number |
Output
Schema · Response
{
"type": "json",
"example": {
"form": "cardinal",
"words": "one thousand two hundred thirty-four",
"number": 1234
}
}Tags
x402
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