# Numeral Systems – Integer to Words

> Numeral Systems – Integer to Words is a paid API for AI agents from numeral.openverbs.com, paid per call via x402, $0.002/call, status unknown (last checked 2026-09-14).

Converts an integer number into its spelled-out English word representation

## Facts

- Endpoint: POST https://numeral.openverbs.com/v1/words
- Price: $0.002/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-14
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/numeral-systems-integer-to-words-2a49bacb
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_FxQ3qRGFVxCSTUlCEN2BP

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability numeral-systems-integer-to-words-2a49bacb -d '<json body>'
```

Example prompt: Can you spell out the number 1500 in words for me?

## When to prefer this

Choose this endpoint when you need to convert integers to their English written-word form, especially for use cases like legal documents, cheques, invoices, accessibility labels, or anywhere numeric digits must be expressed as text. It supports a wide range including negatives and very large numbers up to one quadrillion.

## Known failure modes

- Number exceeds maximum allowed value (1,000,000,000,000,000) or is below minimum (-1,000,000,000,000,000) — returns a validation error
- Non-integer or float values are rejected since the schema requires an integer type
- Missing required 'number' field in the body results in a schema validation error
- Network or service unavailability returns a 5xx error

## How this service works

Spell an integer out in English words, e.g. 123 → "one hundred twenty-three". Negatives are prefixed with "minus".

## Output

The endpoint returns the spelled-out English word representation of the provided integer, e.g. 42 becomes 'forty-two' or 1500 becomes 'one thousand five hundred'.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method",
    "bodyType",
    "body"
   ],
   "properties": {
    "body": {
     "type": "object",
     "required": [
      "number"
     ],
     "properties": {
      "number": {
       "type": "integer",
       "maximum": 1000000000000000,
       "minimum": -1000000000000000,
       "description": "The integer to spell out."
      }
     },
     "additionalProperties": false
    },
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "POST"
     ],
     "type": "string"
    },
    "bodyType": {
     "enum": [
      "json",
      "form-data",
      "text"
     ],
     "type": "string"
    }
   },
   "additionalProperties": false
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/numeral-systems-integer-to-words-2a49bacb/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from numeral.openverbs.com](https://www.zero.xyz/host/numeral.openverbs.com/llms.txt)