# Vextorium Number to Words (Spanish/English)

> Vextorium Number to Words (Spanish/English) is a paid API for AI agents from api.vextorium.com, paid per call via x402, $0.003/call, status unknown (last checked 2026-10-13).

Converts a number or monetary amount into its written-out word form in Spanish or English, supporting EUR, USD, GBP, and MXN currencies with correct grammatical forms.

## Facts

- Endpoint: POST https://api.vextorium.com/numero-a-letras-pago?utm_source=zero.xyz
- Price: $0.003/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-13
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/vextorium-number-to-words-spanish-english-8ddb68e3
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_XE9l7IETEO41eXKwsK3T7

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 vextorium-number-to-words-spanish-english-8ddb68e3 -d '<json body>'
```

Example prompt: Write out the amount 1234.56 in words in Spanish for a EUR invoice — something like 'mil doscientos treinta y cuatro euros con cincuenta y seis céntimos', and make it all uppercase.

## When to prefer this

Choose this endpoint when you need a number or monetary amount converted to its written-out word form for formal documents such as invoices, cheques, or contracts, especially when correct Spanish grammatical rules (apocope: 'veintiún', 'un millón de euros') are required. It is the right choice over generic translation or NLP services when currency-aware, grammatically correct number-to-word conversion in Spanish or English is needed.

## Known failure modes

- Missing required 'numero' field returns a validation error
- Unsupported currency code causes an error or is ignored
- Very large numbers may exceed formatting limits
- Invalid language enum value (anything other than 'es' or 'en') causes rejection
- Non-numeric input in numero field causes a schema validation error

## How this service works

Write a number or money amount in words, in Spanish or English (EUR, USD, GBP, MXN), with correct Spanish apocope (veintiún, un millón de euros). For invoices, cheques and contracts.

## Output

Returns a JSON object containing the number spelled out in words as a string (e.g. 'mil doscientos treinta y cuatro euros con cincuenta y seis céntimos'), along with the language, currency, and original number echoed back. Optionally returns the text in all capitals.

## 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": {
     "required": [
      "numero"
     ],
     "properties": {
      "idioma": {
       "enum": [
        "es",
        "en"
       ],
       "type": "string"
      },
      "moneda": {
       "type": "string",
       "description": "EUR, USD, GBP or MXN (optional)"
      },
      "numero": {
       "type": "number",
       "description": "Number or amount"
      },
      "mayusculas": {
       "type": "boolean",
       "description": "Return in capitals"
      }
     }
    },
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "POST"
     ],
     "type": "string"
    },
    "bodyType": {
     "enum": [
      "json",
      "form-data",
      "text"
     ],
     "type": "string"
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": [
      "object",
      "null"
     ],
     "properties": {
      "texto": {
       "type": [
        "string",
        "null"
       ]
      },
      "idioma": {
       "type": [
        "string",
        "null"
       ]
      },
      "moneda": {
       "type": [
        "string",
        "null"
       ]
      },
      "numero": {
       "type": [
        "number",
        "null"
       ]
      }
     }
    }
   }
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "texto": "mil doscientos treinta y cuatro euros con cincuenta y seis céntimos",
  "idioma": "es",
  "moneda": "EUR",
  "numero": 1234.56
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/vextorium-number-to-words-spanish-english-8ddb68e3/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from api.vextorium.com](https://www.zero.xyz/host/api.vextorium.com/llms.txt)