# Numeral Systems Ordinal Converter

> Numeral Systems Ordinal Converter 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 a non-negative integer into its ordinal string representation (e.g., 1 → '1st', 42 → '42nd')

## Facts

- Endpoint: POST https://numeral.openverbs.com/v1/ordinal
- 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-ordinal-converter-fdb019d9
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_-Hm4RL4UQkSCI1v9M0HcT

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-ordinal-converter-fdb019d9 -d '<json body>'
```

Example prompt: What's the ordinal form of 53? I need it written out like '53rd' for a leaderboard label.

## When to prefer this

Choose this endpoint when you need a fast, reliable, pay-per-call conversion of a single integer to its ordinal suffix (1st, 2nd, 3rd, etc.) without setting up a local library or NLP pipeline. Ideal for serverless agents and workflows that occasionally need ordinal formatting without bundling string-manipulation dependencies.

## Known failure modes

- Number outside allowed range (0–1,000,000,000,000,000) returns a validation error
- Non-integer or negative values rejected by schema validation
- Missing 'number' field in body results in a 400-level error
- Network or service downtime returns a 5xx error

## How this service works

Format a non-negative integer as an ordinal — both the suffixed form (21st) and the ordinal words (twenty-first).

## Output

Returns the ordinal string representation of the submitted integer (e.g., 1 → '1st', 2 → '2nd', 11 → '11th', 101 → '101st'), suitable for direct use in UI labels, text generation, or announcements.

## 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": 0,
       "description": "Non-negative integer."
      }
     },
     "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-ordinal-converter-fdb019d9/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)