# OpenVerbs Inflect – Singularize

> OpenVerbs Inflect – Singularize is a paid API for AI agents from inflect.openverbs.com, paid per call via x402, $0.002/call, status unknown (last checked 2026-09-14).

Converts an English word to its singular form, correctly handling irregular plurals such as people→person and mice→mouse.

## Facts

- Endpoint: POST https://inflect.openverbs.com/v1/singularize
- 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/openverbs-inflect-singularize-92dcabab
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_KZN2ru1RPc4rompbL4h9A

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 openverbs-inflect-singularize-92dcabab -d '<json body>'
```

Example prompt: What's the singular form of 'children'? I need to normalize it properly, including irregular cases.

## When to prefer this

Choose this endpoint when you need reliable singular conversion of English nouns, especially when irregular plurals must be handled correctly. It is purpose-built for morphological normalization and is more dependable than general-purpose LLM guessing for edge cases like 'alumni→alumnus' or 'data→datum'.

## Known failure modes

- Empty or missing 'word' field returns a validation error
- Word exceeding 256 characters is rejected
- Non-English or unrecognized words may be returned unchanged or best-guessed
- Network timeout if the service is temporarily unavailable
- Payment failure (402) if USDC balance is insufficient for the $0.002 per-call fee

## How this service works

Return the singular form of an English word (handles irregulars — people → person, mice → mouse).

## Output

The API returns the singular form of the submitted English word as a string, correctly resolving irregular plurals (e.g. 'oxen'→'ox', 'mice'→'mouse', 'people'→'person') as well as regular ones.

## 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": [
      "word"
     ],
     "properties": {
      "word": {
       "type": "string",
       "maxLength": 256,
       "minLength": 1,
       "description": "The word to singularize."
      }
     },
     "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/openverbs-inflect-singularize-92dcabab/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from inflect.openverbs.com](https://www.zero.xyz/host/inflect.openverbs.com/llms.txt)