# Word Forms and Inflections Lookup

> Word Forms and Inflections Lookup is a paid API for AI agents from dictionary-wiktionary.x402tookit.com, paid per call via x402, $0.02/call, status unknown (last checked 2026-11-02).

Returns inflected forms of an English word by part of speech (plural, past tense, -ing, etc.) and identifies the base lemma if the input is itself an inflection.

## Facts

- Endpoint: GET https://dictionary-wiktionary.x402tookit.com/word-forms?utm_source=zero.xyz
- Price: $0.02/call
- Payment: x402
- Status: unknown
- Last checked: 2026-11-02
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/word-forms-and-inflections-lookup-cd12ada9
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_HMX3Z4-HhzMIHJqgM5jrp

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 word-forms-and-inflections-lookup-cd12ada9
```

Example prompt: What are all the inflected forms of the word 'run' — like its past tense, plural, and -ing form — and if 'ran' is an inflection, tell me what base word it comes from?

## When to prefer this

Choose this endpoint when you need structured morphological data for English words — specifically their inflected forms by part of speech or the base lemma of an inflected form. Prefer this over a full dictionary definition endpoint when you only need morphology (not definitions or etymology), or when normalizing tokens in NLP pipelines. It is particularly valuable for irregular forms like 'went'→'go' or 'mice'→'mouse' that rule-based stemmers miss.

## Known failure modes

- Word not found in Wiktionary returns empty or null entries
- Non-English words may return no results or degraded data
- Highly archaic or rare words may have incomplete form coverage
- Misspelled input returns no matches
- Ambiguous words with multiple etymologies may return partial or inconsistent forms

## How this service works

Inflected forms of an English word by part of speech (plural, past, -ing) and the base word if it is an inflection.

## Output

Returns a structured object containing the queried word, its lemmas (base forms), and per-entry data grouped by part of speech — including an array of inflected forms each with a form string and descriptive label (e.g. 'plural', 'past tense', 'present participle'). Also includes a formOf array indicating if the word is itself an inflection of another lemma, plus metadata like source URL, license, and data freshness timestamp.

## 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"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "GET"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "required": [
      "word"
     ],
     "properties": {
      "word": {
       "type": "string",
       "description": "English word, e.g. run, mice, went, good"
      }
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object",
     "properties": {
      "asOf": {
       "type": [
        "null",
        "string"
       ]
      },
      "word": {
       "type": [
        "null",
        "string"
       ]
      },
      "lemmas": {
       "type": [
        "array",
        "null"
       ],
       "items": {
        "type": "string"
       }
      },
      "source": {
       "type": [
        "null",
        "string"
       ]
      },
      "entries": {
       "type": [
        "array",
        "null"
       ],
       "items": {
        "type": "object",
        "properties": {
         "pos": {
          "type": [
           "null",
           "string"
          ]
         },
         "tags": {
          "type": [
           "array",
           "null"
          ]
         },
         "forms": {
          "type": [
           "array",
           "null"
          ],
          "items": {
           "type": "object",
           "properties": {
            "form": {
             "type": [
              "null",
              "string"
             ]
            },
            "label": {
             "type": [
              "null",
              "string"
             ]
            }
           }
          }
         },
         "formOf": {
          "type": [
           "array",
           "null"
          ],
          "items": {
           "type": "object",
           "properties": {
            "lemma": {
             "type": [
              "null",
              "string"
             ]
            },
            "description": {
             "type": [
              "null",
              "string"
             ]
            }
           }
          }
         },
         "headword": 
… (truncated)
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/word-forms-and-inflections-lookup-cd12ada9/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from dictionary-wiktionary.x402tookit.com](https://www.zero.xyz/host/dictionary-wiktionary.x402tookit.com/llms.txt)