# Word Tools – Synonyms & Antonyms

> Word Tools – Synonyms & Antonyms is a paid API for AI agents from word-tools.x402tookit.com, paid per call via x402, $0.02/call, status unknown (last checked 2026-10-21).

Returns synonyms and antonyms for a given word, ranked by relevance, with parts of speech for each result.

## Facts

- Endpoint: GET https://word-tools.x402tookit.com/synonyms-antonyms?utm_source=zero.xyz
- Price: $0.02/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-21
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/word-tools-synonyms-antonyms-1ea28a44
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_iujHoH7SY6UjXSuwVwLZR

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-tools-synonyms-antonyms-1ea28a44
```

Example prompt: What are the synonyms and antonyms of 'resilient'? Give me the top 10 for each, ranked by relevance, and include the parts of speech.

## When to prefer this

Choose this endpoint when you need both synonyms and antonyms together with relevance scores and parts-of-speech labels in a single call. Prefer it over a generic thesaurus scrape when structured, machine-readable output and per-word grammar tagging are required — e.g. for writing assistants, NLP pipelines, vocabulary tools, or quiz generators.

## Known failure modes

- Word not found in the lexical database — empty synonym/antonym arrays returned
- Invalid or missing 'word' query parameter — request fails with a 4xx error
- Limit parameter out of range (must be 1–50) — may return default 20 or an error
- Service operating in degraded mode — partial results with a degraded flag set to true
- Network or upstream timeout — no response or 5xx error

## How this service works

Synonyms and antonyms of a word, ranked by relevance, with parts of speech.

## Output

A JSON object containing the queried word, a list of synonyms and a list of antonyms — each entry includes the word, a relevance score, and an array of parts of speech. Also includes source attribution and optional metadata like a summary or degraded-mode flag.

## 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": "The word to look up"
      },
      "limit": {
       "type": "integer",
       "description": "Results per list, 1 to 50 (default 20)"
      }
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object",
     "properties": {
      "asOf": {
       "type": [
        "null",
        "string"
       ]
      },
      "word": {
       "type": [
        "null",
        "string"
       ]
      },
      "source": {
       "type": [
        "null",
        "string"
       ]
      },
      "reasons": {
       "type": [
        "array",
        "null"
       ],
       "items": {
        "type": "string"
       }
      },
      "summary": {
       "type": [
        "null",
        "string"
       ]
      },
      "verdict": {
       "type": [
        "null",
        "string"
       ]
      },
      "antonyms": {
       "type": [
        "array",
        "null"
       ],
       "items": {
        "type": "object",
        "properties": {
         "word": {
          "type": [
           "null",
           "string"
          ]
         },
         "score": {
          "type": [
           "null",
           "number"
          ]
         },
         "partsOfSpeech": {
          "type": [
           "array",
           "null"
          ],
          "items": {
           "type": "string"
          }
         }
        }
       }
      },
      "degraded": {
       "type": [
        "boolean",
        "null"
       ]
      },
      "synonyms": {
       "type": [
        "array",
        "null"
       ],
       "items": {
        "type": "object",
        "properties": {
         "word": {
          "type": [
           "null",
           "string"
          ]
         },
         "score": {
          "type": [
           "null",
           "number"
          ]
         },
      
… (truncated)
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/word-tools-synonyms-antonyms-1ea28a44/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from word-tools.x402tookit.com](https://www.zero.xyz/host/word-tools.x402tookit.com/llms.txt)